MARINE DRILLING COMPANIES INC
S-3, 1998-06-09
DRILLING OIL & GAS WELLS
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<PAGE>   1
 
      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JUNE 9, 1998
                                                      REGISTRATION NO. 333-
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             ---------------------
                                    FORM S-3
 
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                             ---------------------
                        MARINE DRILLING COMPANIES, INC.
            (Exact name of registrants as specified in its charter)
 
<TABLE>
  <S>                                                        <C>
                            TEXAS                                                    74-2558926
                 (State of other jurisdiction                                     (I.R.S. Employer
              of incorporation or organization)                                 Identification No.)
</TABLE>
 
  See "Table of Additional Registrants" on the following page for information
    relating to the subsidiaries of Marine Drilling Companies, Inc. that may
      guarantee payments owed on the Debt Securities registered hereunder.
 
<TABLE>
<S>                                                         <C>
          ONE SUGAR CREEK CENTER BLVD., SUITE 600                                T. SCOTT O'KEEFE
               SUGAR LAND, TEXAS 77478-3556                           ONE SUGAR CREEK CENTER BLVD., SUITE 600
                      (281) 243-3000                                       SUGAR LAND, TEXAS 77478-3556
                                                                                  (281) 243-3000
        (Address, including zip code, and telephone              (Name, address, including zip code, and telephone
              number, including area code, of                    number including area code, of agent for service)
         registrants' principal executive offices)
</TABLE>
 
                                    Copy to:
                                 SCOTT N. WULFE
                             VINSON & ELKINS L.L.P.
                             2300 FIRST CITY TOWER
                           HOUSTON, TEXAS 77002-6760
                                 (713) 758-2750
    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the Registration Statement becomes effective.
    If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.  [ ]
    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box.  [X]
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  [ ]
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [ ]
 
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
<CAPTION>
====================================================================================================================
                   TITLE OF EACH CLASS OF                      PROPOSED MAXIMUM AGGREGATE          AMOUNT OF
             SECURITIES TO BE REGISTERED(1)(2)                    OFFERING PRICE(3)(4)          REGISTRATION FEE
====================================================================================================================
<S>                                                           <C>                           <C>
Debt Securities(5)..........................................
- --------------------------------------------------------------------------------------------------------------------
Preferred Stock.............................................
- --------------------------------------------------------------------------------------------------------------------
Common Stock, including attached preferred share purchase
  rights(6).................................................
- --------------------------------------------------------------------------------------------------------------------
Warrants to purchase Common Stock...........................
- --------------------------------------------------------------------------------------------------------------------
Guarantees(7)...............................................
- --------------------------------------------------------------------------------------------------------------------
        TOTAL...............................................        $233,770,500(8)                $68,963(8)
====================================================================================================================
</TABLE>
 
(1) Certain information as to each class of securities to be registered is not
    specified in accordance with General Instruction II.D. to Form S-3 under the
    Securities Act of 1933, as amended.
 
(2) This registration statement also covers such indeterminate amount of
    securities as may be issued in exchange for, or upon conversion or exercise
    of, as the case may be, the Debt Securities or Preferred Stock registered
    hereunder. Any securities registered hereunder may be sold separately or as
    units with other securities registered hereunder.
 
(3) No separate consideration will be received for any securities registered
    hereunder that are issued in exchange for, or upon conversion of, as the
    case may be, the Debt Securities or Preferred Stock registered hereunder.
 
(4) The proposed maximum offering price per unit will be determined from time to
    time by the registrants in connection with, and at the time of, the issuance
    by the registrants of the securities registered hereunder.
 
(5) The aggregate principal amount of the Debt Securities may be increased if
    any Debt Securities are issued at an original issue discount by an amount
    such that the gross proceeds to be received by the registrants shall be
    equal to the above amount to be registered. Any offering of Debt Securities
    denominated other than in U.S. dollars will be treated as the equivalent of
    U.S. dollars based on the exchange rate applicable to the purchase of such
    Debt Securities at the time of initial offering. In no event will the
    aggregate initial offering price of all securities issued from time to time
    pursuant to this Registration Statement exceed $233,770,500, or the
    equivalent thereof in foreign currencies or composite currencies.
 
(6) Preferred share purchase rights entitle the holder to purchase 1/1000 of a
    share of Junior Participating Preferred Stock in certain circumstances. Such
    rights are attached to and trade with the Common Stock and no additional
    consideration will be received for the issuance of such rights.
 
(7) Guarantees that may be provided by the subsidiaries named in the "Table of
    Additional Registrants" on the following page, with respect to the Debt
    Securities registered hereunder. No additional consideration will be
    received for such guarantees. Pursuant to Rule 457(n) under the Securities
    Act, no additional filing fee is required in connection with such
    guarantees.
 
(8) Pursuant to Rule 429 under the Securities Act, the Prospectus contained
    herein also relates to $66,229,500 of securities of Marine Drilling
    Companies, Inc. previously registered under Registration Statement on Form
    S-3 No. 333-6997 and not issued. The filing fee of $51,725 relating to such
    registration statement (which originally covered $150,000,000 of securities)
    was paid in connection with the original filing thereof on June 21, 1996.
 
    THE REGISTRANTS HEREBY AMEND THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANTS
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
 
    PURSUANT TO RULE 429 UNDER THE SECURITIES ACT OF 1933, THE PROSPECTUS
INCLUDED HEREIN CONTAINS A COMBINED PROSPECTUS THAT ALSO RELATES TO A TOTAL OF
$66,229,500 OF SECURITIES OF MARINE DRILLING COMPANIES, INC. PREVIOUSLY
REGISTERED UNDER REGISTRATION STATEMENT ON FORM S-3 NO. 333-6997 AND NOT ISSUED.
THIS REGISTRATION STATEMENT CONSTITUTES POST-EFFECTIVE AMENDMENT NO. 1 TO
REGISTRATION STATEMENT ON FORM S-3 NO. 333-6997 PURSUANT TO WHICH THE TOTAL
AMOUNT OF UNSOLD SECURITIES PREVIOUSLY REGISTERED UNDER REGISTRATION STATEMENT
ON FORM S-3 NO. 333-6997 MAY BE OFFERED AND SOLD TOGETHER WITH THE SECURITIES
REGISTERED HEREUNDER, THROUGH THE USE OF THE COMBINED PROSPECTUS INCLUDED
HEREIN. IN THE EVENT ANY OF SUCH PREVIOUSLY REGISTERED SECURITIES ARE OFFERED
AND SOLD PRIOR TO THE EFFECTIVE DATE OF THIS REGISTRATION STATEMENT, THE AMOUNT
OF SUCH SECURITIES WILL NOT BE INCLUDED IN ANY PROSPECTUS HEREUNDER.
================================================================================
<PAGE>   2
 
                        TABLE OF ADDITIONAL REGISTRANTS
 
                    UNDER REGISTRATION STATEMENT ON FORM S-3
 
     The following subsidiaries of Marine Drilling Companies, Inc. are
co-registrants under this Registration Statement for the purpose of providing
guarantees, if any, of payments on Debt Securities registered hereunder:
 
<TABLE>
<CAPTION>
                                                         JURISDICTION OF     I.R.S. EMPLOYER
NAME                                                      INCORPORATION     IDENTIFICATION NO.
- ----                                                     ---------------    ------------------
<S>                                                      <C>                <C>
Marine Drilling Management Company.....................  Delaware               74-2570231
Marine Drilling International, Inc.....................  Delaware               76-0395411
Marine 300 Series, Inc.................................  Delaware               74-2562642
</TABLE>
<PAGE>   3
 
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
 
PROSPECTUS         SUBJECT TO COMPLETION, DATED JUNE 9, 1998
                        MARINE DRILLING COMPANIES, INC.
 
                                DEBT SECURITIES
                                PREFERRED STOCK
                                  COMMON STOCK
                                    WARRANTS
 
LOGO                         ---------------------
 
     Marine Drilling Companies, Inc. ("Marine" or the "Company") may offer and
sell from time to time, (i) unsecured debt securities, in one or more series,
consisting of notes, debentures or other evidences of indebtedness (the "Debt
Securities"), (ii) shares of preferred stock, par value $.01 per share of the
Company, in one or more series (the "Preferred Stock"), (iii) shares of common
stock of the Company, par value $.01 per share (the "Common Stock"), (iv)
warrants (the "Warrants") to purchase Common Stock and (v) guarantees, if any,
of the Company's payment obligations under any Debt Securities, given by one or
more subsidiaries of the Company named herein (the "Subsidiary Guarantees"). The
Company may offer and sell up to $300,000,000 aggregate public offering price of
Debt Securities, Preferred Stock, Common Stock, Warrants and Subsidiary
Guarantees (collectively, the "Securities"). The Securities may be offered in
separate series in amounts, and prices, and on terms to be determined at or
prior to the time of sale.
 
     The specific terms of the particular Securities to be issued will be set
forth in a supplement to this Prospectus (a "Prospectus Supplement"), which will
be delivered together with this Prospectus, including, where applicable, (i) in
the case of Debt Securities, the specific designation, aggregate principal
amount, ranking as senior or subordinated Debt Securities, maturity, rate or
rates (or method of determining the same) and time or times for the payment of
interest, if any, any exchangeability or conversion terms, any terms for
optional or mandatory redemption or repurchase, or payment of additional amounts
or any sinking fund provisions, whether or not such Debt Securities are
guaranteed by subsidiaries of the Company, and any other specific terms of such
Debt Securities, (ii) in the case of Preferred Stock, the specific designation,
number of shares and liquidation value thereof and the dividend, liquidation,
redemption, voting and other rights, including conversion or exchange rights, if
any, and any other specific terms, (iii) in the case of Common Stock, the number
of shares, and (iv) in the case of Warrants, the number and terms thereof, the
number of shares of Common Stock issuable upon their exercise, the exercise
price, the terms of the offering and sale thereof and the duration and
detachability thereof. The Prospectus Supplement will also contain information
regarding the initial public offering price, the net proceeds to the Company
and, where applicable, the United States Federal income tax considerations
relating to the Securities covered by the Prospectus Supplement and a
description of certain factors that should be considered in connection with an
investment in the Securities covered by the Prospectus Supplement. Debt
Securities may be issued in registered form or bearer form with or without
interest coupons attached, or both. In addition, all or a portion of the Debt
Securities of a series may be issuable in temporary or permanent global form.
Debt Securities in bearer form are offered only to non-United States persons and
to offices located outside the United States of certain United States financial
institutions.
 
     The Securities may be sold directly by the Company to investors, through
agents designated from time to time or to or through underwriters or dealers.
See "Plan of Distribution." If any agents of the Company or any underwriters are
involved in the sale of any Securities in respect of which the Prospectus is
being delivered, the names of such agents or underwriters and any applicable
commissions or discounts will be set forth in the Prospectus Supplement.
 
     The Common Stock is listed on the Nasdaq Stock Market under the symbol
"MDCO." The Prospectus Supplement will contain information about any listing on
a securities exchange of the Securities covered by the Prospectus Supplement.
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
                             ---------------------
 
     THIS PROSPECTUS MAY NOT BE USED TO CONSUMMATE SALES OF THE SECURITIES
UNLESS ACCOMPANIED BY A PROSPECTUS SUPPLEMENT.
 
               , 1998
<PAGE>   4
 
                             AVAILABLE INFORMATION
 
     The Company is subject to the informational filing requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
accordance therewith files reports, proxy statements and other information with
the Securities and Exchange Commission (the "Commission"). Reports, proxy
statements and other information filed by the Company may be inspected and
copied at the public reference facilities maintained by the Commission at Room
1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549, and the
Commission's Regional Offices located at Seven World Trade Center, New York, New
York 10048, and Citicorp Center, 500 West Madison Street, Suite 1400, Chicago,
Illinois 60661. Copies of such material can be obtained by mail from the Public
Reference Branch of the Commission at 450 Fifth Street, N.W., Washington, D.C.
20549, at prescribed rates. Such material may also be inspected at the offices
of the Nasdaq National Market, 1735 K Street, N.W., Washington, D.C. 20006. The
Commission maintains a World Wide Website on the Internet at http://www.sec.gov
that contains reports, proxy and information statements and other information
regarding registrants that file electronically with the Commission.
 
     The Company has filed with the Commission a registration statement on Form
S-3 (herein, together with all amendments and exhibits, referred to as the
"Registration Statement") under the Securities Act of 1933, as amended (the
"Securities Act"). This Prospectus does not contain all the information
contained in the Registration Statement, certain portions of which are omitted
as permitted by the rules and regulations of the Commission. For further
information with respect to the Company and the securities offered hereby,
reference is made to the Registration Statement, including the exhibits thereto,
which may be inspected at the Commission's offices, without charge or copies of
which may be obtained from the Commission upon payment of prescribed fees.
Statements contained in this Prospectus as to the contents of any contract or
other document filed as an exhibit to the Registration Statement are not
necessarily complete, and in each instance reference is hereby made to the copy
of such contract or other document filed as an exhibit to the Registration
Statement, each such statement being qualified in all respects by such
reference.
                             ---------------------
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The following documents filed by the Company with the Commission (File No.
0-18309) pursuant to the Exchange Act are incorporated herein by reference:
 
     1. The Company's Annual Report on Form 10-K for the fiscal year ended
        December 31, 1997.
 
     2. The Company's Quarterly Report on Form 10-Q for the quarter ended March
        31, 1998.
 
     3. The description of the Common Stock contained in the Registration
        Statement on Form 8-B filed with the Commission on February 21, 1990, as
        amended by Form 8 filed with the Commission on November 9, 1992, and any
        subsequent amendment thereto filed for the purpose of updating such
        description.
 
     4. The description of the Company's Preferred Share Purchase Rights
        contained in the Company's Registration Statement on Form 8-A dated
        November 15, 1996.
 
     All other documents filed by the Company pursuant to Section 13(a), 13(c),
14 or 15(d) of the Exchange Act subsequent to the date of this Prospectus and
prior to the termination of the offering of the Securities pursuant hereto shall
be deemed to be incorporated by reference in this Prospectus and to be a part
hereof from the date of filing of such documents. Any statement contained in a
document all or a portion of which is incorporated or deemed to be incorporated
by reference herein shall be deemed to be modified or superseded for purposes of
this Prospectus to the extent that a statement contained herein or in any other
subsequently filed document which also is or is deemed to be incorporated by
reference herein modifies or supersedes such statement. Any statement so
modified shall not be deemed to constitute a part of this Prospectus except as
so modified, and any statement so superseded shall not be deemed to constitute
part of this Prospectus.
 
     The Company will provide without charge to each person, including any
beneficial owner, to whom a copy of this Prospectus is delivered, upon the
written or oral request of any such person, a copy of any or all of the
 
                                        2
<PAGE>   5
 
documents which are incorporated herein by reference, other than exhibits to
such documents (unless such exhibits are specifically incorporated by reference
into such documents). Requests should be directed to the Company, One Sugar
Creek Center Blvd., Suite 600, Sugar Land, Texas 77478-3556, Attention: Investor
Relations (telephone: 281/243-3000).
 
                             ---------------------
 
                                  THE COMPANY
 
     The Company is engaged in the offshore contract drilling of oil and gas
wells for independent and major oil and gas companies. As of the date of this
Prospectus, the Company owns and operates a fleet of 16 offshore drilling rigs,
consisting of five independent leg jack-up units, three of which have a
cantilever feature, nine mat supported jack-up units, four of which have a
cantilever feature, and two semi-submersible units. The Company operates an
additional semi-submersible drilling rig under a bareboat charter.
 
     The Company was incorporated in Texas in January, 1990, although the
Company or its predecessors have been engaged in offshore contract drilling
since 1966. The Company's principal executive office is located at One Sugar
Creek Center Boulevard, Suite 600, Sugar Land, Texas 77478-3556 and the
Company's telephone number is (281) 243-3000. The "Company" or "Marine" refers
to Marine Drilling Companies, Inc. and its consolidated subsidiaries, unless
otherwise indicated or the context otherwise suggests.
 
                                USE OF PROCEEDS
 
     Unless otherwise provided in the Prospectus Supplement, the net proceeds
from the sale of the Securities offered by this Prospectus and the Prospectus
Supplement (the "Offered Securities") will be used for general corporate
purposes, which may include repayment of indebtedness, acquisitions, additions
to working capital, and capital expenditures. Until so utilized, it is expected
that such net proceeds will be invested in interest bearing time deposits or
short-term marketable securities.
 
                     RATIO OF EARNINGS TO FIXED CHARGES AND
            EARNINGS TO FIXED CHARGES AND PREFERRED STOCK DIVIDENDS
 
     The following table sets forth the ratio of earnings to fixed charges and
combined ratio of earnings to fixed charges and preferred stock dividend
requirements for the Company for the periods indicated:
 
<TABLE>
<CAPTION>
                                                                                     THREE MONTHS
                                                     YEAR ENDED DECEMBER 31,            ENDED
                                               -----------------------------------    MARCH 31,
                                               1993   1994    1995    1996   1997        1998
                                               ----   -----   -----   ----   -----   ------------
<S>                                            <C>    <C>     <C>     <C>    <C>     <C>
Ratio of earnings to fixed charges...........  41.2   131.3      --   33.1   94.8       223.0
Ratio of earnings to combined fixed charges
  and preferred stock dividend
  requirements...............................  41.2   131.3      --   33.1   94.8       223.0
</TABLE>
 
     For purposes of computing the ratio of earnings to fixed charges: (i)
earnings consist of income before provision for income taxes plus fixed charges
as described below, excluding capitalized interest for the period and (ii) fixed
charges consist of interest expensed and capitalized, amortization of debt
discount and expense relating to indebtedness and the portion of rental expense
representative of the interest factor attributable to leases for rental
property. For purposes of computing the ratio of earnings to combined fixed
charges and preferred stock dividend requirements: (a) earnings consist of
income before provision for income taxes plus fixed charges and preferred stock
dividend requirements, excluding capitalized interest for the period and (b)
fixed charges and preferred stock dividend requirements consist of interest
expensed and capitalized, amortization of debt discount and expense relating to
indebtedness, the portion of rental expense representative of the interest
factor attributable to leases for rental property and preferred stock dividends.
 
     Because of losses, earnings were not sufficient to cover fixed charges by
$6,228,000 for the year ended December 31, 1995. The Company had no preferred
stock dividend requirement for the periods indicated.
 
                                        3
<PAGE>   6
 
                         DESCRIPTION OF DEBT SECURITIES
 
     The Debt Securities will constitute either senior or senior subordinated
debt of the Company ("Senior Debt Securities"), or subordinated debt of the
Company ("Subordinated Debt Securities"). Senior Debt Securities and
Subordinated Debt Securities will be issued pursuant to separate indentures
(respectively, a "Senior Debt Indenture" and a "Subordinated Debt Indenture"),
in each case between the Company, the Subsidiary Guarantors and Chase Bank of
Texas, National Association as trustee (the "Trustee"), and in substantially the
form that has been filed as an exhibit to the Registration Statement of which
this Prospectus is a part, subject to such amendments or supplements as may be
adopted from time to time. The Senior Debt Indenture and the Subordinated Debt
Indenture, as amended or supplemented from time to time, are sometimes
hereinafter referred to individually as an "Indenture" and collectively as the
"Indentures." The following summaries of provisions of the Indentures and the
Debt Securities do not purport to be complete and such summaries are subject to
the detailed provisions of the applicable Indenture to which reference is hereby
made for a full description of such provisions, including the definition of
certain terms used herein. Article or section references in parentheses below
are to articles or sections in both Indentures unless otherwise indicated.
Wherever particular sections or defined terms of the applicable Indenture are
referred to, such sections or defined terms are incorporated herein by reference
as part of the statement made, and the statement is qualified in its entirety by
such reference. The Indentures are substantially identical, except for
provisions relating to subordination and conversion.
 
     The Debt Securities may be issued from time to time in one or more series.
The following description of the Debt Securities sets forth certain general
terms and provisions of the Debt Securities of all series. The particular terms
of each series of Debt Securities offered by any Prospectus Supplement (the
"Offered Debt Securities") will be described therein.
 
PROVISIONS APPLICABLE TO BOTH SENIOR AND SUBORDINATED DEBT SECURITIES
 
  General
 
     The Debt Securities will be unsecured senior, senior subordinated or
subordinated obligations of the Company and may be issued from time to time in
one or more series. The payment obligations of the Company under any Debt
Securities may, if specified in any Prospectus Supplement, be fully and
unconditionally guaranteed by one or more of the following subsidiaries of the
Company: Marine Drilling Management Company, Marine Drilling International, Inc.
and Marine 300 Series, Inc. (the "Subsidiary Guarantors"). If any series of Debt
Securities is guaranteed by a Subsidiary Guarantor (a "Subsidiary Guarantee"),
the applicable Prospectus Supplement will identify each Subsidiary Guarantor and
describe such Subsidiary Guarantee, including the circumstances in which it may
be released. Any guarantee of Debt Securities by a Subsidiary Guarantor will be
on a full and unconditional basis.
 
     Except as may be set forth in any Prospectus Supplement, the Indentures do
not limit the amount of Debt Securities, debentures, notes or other types of
indebtedness that may be issued by the Company or any of its Subsidiaries nor do
they restrict transactions between the Company and its affiliates or the payment
of dividends or other distributions by the Company to its stockholders. The
rights of holders of Debt Securities will be limited to the assets of the
Company and the Debt Securities will not be obligations of any of the Company's
Subsidiaries, except in the case of any Debt Securities that are guaranteed by
such Subsidiaries. In addition, other than as may be set forth in any Prospectus
Supplement, the Indentures do not and the Debt Securities will not contain any
covenants or other provisions that are intended to afford holders of the Debt
Securities special protection in the event of either a change of control of the
Company or a highly leveraged transaction by the Company.
 
     The Company conducts substantially all of its operations through its
Subsidiaries. Accordingly, the Company's ability to meet its cash obligations is
dependent upon the ability of its Subsidiaries to make cash distributions to the
Company. The ability of its Subsidiaries to make distributions to the Company is
and will continue to be restricted by, among other limitations, applicable
provisions of the laws of national and state governments and contractual
provisions. Except as may be set forth in any Prospectus Supplement, the
Indentures do not limit the ability of the Company's Subsidiaries to incur such
restrictions in the future. The
 
                                        4
<PAGE>   7
 
right of the Company to participate in the assets of any Subsidiary (and thus
the ability of Holders of the Debt Securities to benefit indirectly from such
assets) is generally subject to the prior claims of creditors, including trade
creditors, of that Subsidiary, except to the extent that the Company is
recognized as a creditor of such Subsidiary, in which case the Company's claims
would still be subject to any security interest of other creditors of such
Subsidiary. Unless they are guaranteed by the Company's Subsidiaries, therefore,
the Debt Securities will be structurally subordinated to creditors, including
trade creditors, of Subsidiaries of the Company with respect to the assets of
the Subsidiaries against which such creditors have a more direct claim.
 
     Reference is made to the relevant Prospectus Supplement for the following
terms of and information relating to the Offered Debt Securities (to the extent
such terms are applicable to such Offered Debt Securities): (i) the title of the
Offered Debt Securities; (ii) the classification of such Debt Securities as
either Senior Debt Securities or Subordinated Debt Securities (including the
further classification of Senior Debt Securities as either senior debt or senior
subordinated debt); (iii) whether the Offered Debt Securities that constitute
Subordinated Debt Securities are convertible into Common Stock and, if so, the
terms and conditions upon which such conversion will be effected including the
initial conversion price or conversion rate (the "Conversion Price") and any
adjustments thereto, the conversion period and other conversion provisions in
addition to or in lieu of those described herein; (iv) any limit on the
aggregate principal amount of the Offered Debt Securities; (v) whether the
Offered Debt Securities are to be issuable as Registered Securities or Bearer
Securities or both, whether any of the Offered Debt Securities are to be
issuable initially in temporary global form and whether any of the Offered Debt
Securities are to be in permanent global form; (vi) the price or prices
(expressed as a percentage of the aggregate principal amount thereof) at which
the Offered Debt Securities will be issued; (vii) the date or dates on which the
Offered Debt Securities will mature; (viii) the rate or rates per annum (or the
method by which such will be determined) at which the Offered Debt Securities
will bear interest, if any, and the date from which any such interest will
accrue; (ix) the Interest Payment Dates on which any such interest on the
Offered Debt Securities will be payable, the Regular Record Date for any
interest payable on any Offered Debt Securities which are Registered Securities
on any Interest Payment Date and the extent to which, or the manner in which,
any interest payable on a temporary global Offered Debt Security on an Interest
Payment Date will be paid; (x) any mandatory redemption, sinking fund or
analogous provisions; (xi) each office or agency where, subject to the terms of
the Indentures as described below under "Payment and Paying Agents," the
principal of and any premium and interest on the Offered Debt Securities will be
payable and each office or agency where, subject to the terms of the Indentures
as described below under "Form, Exchange, Registration and Transfer," the
Offered Debt Securities may be presented for registration of transfer or
exchange; (xii) the right of the Company to redeem the Offered Debt Securities
at its option and the period or periods within which and the price or prices at
which the Offered Debt Securities may, pursuant to any optional or mandatory
redemption provisions, be redeemed, in whole or in part, and the other detailed
terms and provisions of any such optional or mandatory redemption; (xiii) the
denominations in which any Offered Debt Securities which are Registered
Securities will be issuable, if other than denominations of $1,000 and any
integral multiple thereof, and the denomination or denominations in which any
Offered Debt Securities which are Bearer Securities will be issuable, if other
than the denomination of $5,000; (xiv) the currency or currencies (including
composite currencies) in which payment of principal of and any premium and
interest on the Offered Debt Securities is payable if other than U.S. dollars;
(xv) any index used to determine the amount of payments of principal of and any
premium and interest on the Offered Debt Securities; (xvi) information with
respect to book-entry procedures, if any; (xvii) any deletions from,
modifications of or additions to the Events of Default or covenants of the
Company with respect to such Offered Debt Securities; (xviii) whether the
Offered Debt Securities are to be guaranteed by Subsidiary Guarantors and, if
so, the terms of such Subsidiary Guarantees; (xix) whether the legal and
covenant defeasance provisions of the Indenture are applicable to the Offered
Debt Securities of such series and any additional means of discharge or
conditions thereto applicable to such series; (xx) any subordination provisions
with respect to the Offered Debt Securities of such series (and any related
Subsidiary Guarantees) in addition to or in lieu of those set forth herein; and
(xxi) any other terms of the Offered Debt Securities not inconsistent with the
provisions of the Indentures. (Section 301) Any such Prospectus Supplement will
also describe any special provisions for the payment of additional amounts with
respect to the Offered Debt Securities.
 
                                        5
<PAGE>   8
 
     Debt Securities may be issued as Original Issue Discount Securities. An
Original Issue Discount Security is a Debt Security, including any Zero-Coupon
Security, which is issued at a price lower than the principal amount payable
upon the Stated Maturity thereof and which provides that upon redemption or
acceleration of the maturity thereof an amount less than the amount payable upon
the Stated Maturity thereof and determined in accordance with the terms of such
Debt Security shall become due and payable. Special United States federal income
tax considerations applicable to Debt Securities issued at an original issue
discount, including Original Issue Discount Securities, and special United
States tax considerations and other terms and restrictions applicable to any
Debt Securities which are issued in bearer form, offered exclusively to United
States Aliens or denominated in other than United States dollars, will be set
forth in the Prospectus Supplement relating thereto.
 
  Form, Exchange, Registration and Transfer
 
     Debt Securities of a series may be issuable in definitive form solely as
Registered Securities, solely as Bearer Securities or as both Registered
Securities and Bearer Securities. Unless otherwise indicated in an applicable
Prospectus Supplement, Bearer Securities will have interest coupons attached.
(Section 201) The Indentures also provide that Debt Securities of a series may
be issuable in temporary or permanent global form. (Section 201)
 
     Registered Securities of any series will be exchangeable for other
Registered Securities of the same series of any authorized denominations and of
a like aggregate principal amount and tenor. In addition, if Debt Securities of
any series are issuable as both Registered Securities and Bearer Securities, at
the option of the Holder, and subject to the terms of the applicable Indenture,
Bearer Securities (with all unmatured coupons, except as provided below, and all
matured coupons in default) of such series will be exchangeable for Registered
Securities of the same series of any authorized denominations and of a like
aggregate principal amount and tenor. Bearer Securities surrendered in exchange
for Registered Securities between a Regular Record Date or a Special Record Date
and the relevant date for payment of interest shall be surrendered without the
coupon relating to such date for payment of interest, and interest accrued as of
such date will not be payable in respect of the Registered Security issued in
exchange for such Bearer Security, but will be payable only to the Holder of
such coupon when due in accordance with the terms of the applicable Indenture.
Bearer Securities will not be issued in exchange for Registered Securities.
(Section 305)
 
     Debt Securities may be presented for exchange as provided above, and
Registered Securities may be presented for registration of transfer (with the
form of transfer endorsed thereon duly executed), at the office of the Security
Registrar or at the office of any transfer agent designated by the Company for
such purpose with respect to any series of Debt Securities and referred to in an
applicable Prospectus Supplement, without service charge and upon payment of any
taxes and other governmental charges as described in the Indentures. Such
transfer or exchange will be effected upon the Security Registrar or such
transfer agent, as the case may be, being satisfied with the documents of title
and identity of the person making the request. The Trustee will serve initially
as Security Registrar. (Section 305) If a Prospectus Supplement refers to any
transfer agents (in addition to the Security Registrar) initially designated by
the Company with respect to any series of Debt Securities, the Company may at
any time rescind the designation of any such transfer agent or approve a change
in the location through which any such transfer agent acts, except that, if Debt
Securities of a series are issuable solely as Registered Securities, the Company
will be required to maintain a transfer agent in each Place of Payment for such
series and, if Debt Securities of a series are also issuable as Bearer
Securities, the Company will be required to maintain (in addition to the
Security Registrar) a transfer agent in a Place of Payment for such series
located outside the United States. The Company may at any time designate
additional transfer agents with respect to any series of Debt Securities.
(Section 1002)
 
     In the event of any redemption in part, the Company shall not be required
to (i) issue, register the transfer of or exchange Debt Securities of any series
during a period beginning at the opening of business 15 days prior to the
selection of Debt Securities of that series for redemption and ending on the
close of business on (A) if Debt Securities of the series are issuable only as
Registered Securities, the day of mailing of the relevant notice of redemption
and (B) if Debt Securities of the series are issuable as Bearer Securities, the
date of the first publication of the relevant notice of redemption or, if
Securities of the series are also
 
                                        6
<PAGE>   9
 
issuable as Registered Securities and there is no publication, the mailing of
the relevant notice of redemption, (ii) register the transfer of or exchange any
Registered Security, or portion thereof, called for redemption, except the
unredeemed portion of any Registered Security being redeemed in part, or (iii)
exchange any Bearer Security called for redemption, except to exchange such
Bearer Security for a Registered Security of that series and like tenor which is
immediately surrendered for redemption. (Section 305)
 
  Payment and Paying Agents
 
     Unless otherwise indicated in an applicable Prospectus Supplement, payment
of principal of and any premium and interest on Bearer Securities will be
payable, subject to any applicable laws and regulations, at the offices of such
Paying Agents outside the United States as the Company may designate from time
to time, in the manner indicated in such Prospectus Supplement. (Section 1002)
Unless otherwise indicated in an applicable Prospectus Supplement, payment of
interest on Bearer Securities on any Interest Payment Date will be made only
against surrender to the Paying Agent of the coupon relating to such Interest
Payment Date. (Section 1001) No payment with respect to any Bearer Security will
be made at any office or agency of the Company in the United States or by check
mailed to any address in the United States or by transfer to any account
maintained with a bank located in the United States. Notwithstanding the
foregoing, payments of principal of and any premium and interest on Bearer
Securities denominated and payable in U.S. dollars will be made at the office of
the Company's Paying Agent in the Borough of Manhattan, City of New York, if
(but only if) payment of the full amount thereof in U.S. dollars at all offices
or agencies outside the United States is illegal or effectively precluded by
exchange controls or other similar restrictions. (Section 1002)
 
     Unless otherwise indicated in an applicable Prospectus Supplement, payment
of principal of and any premium and interest on Registered Securities will be
made at the office of such Paying Agent or Paying Agents as the Company may
designate from time to time, except that at the option of the Company payment of
any interest may be made by check mailed on or before the due date to the
address of the Person entitled thereto as such address shall appear in the
Security Register. (Sections 307, 1002) Unless otherwise indicated in an
applicable Prospectus Supplement, payment of any installment of interest on
Registered Securities will be made to the Person in whose name such Registered
Security is registered at the close of business on the Regular Record Date for
such interest. (Section 307)
 
     Unless otherwise indicated in an applicable Prospectus Supplement, the
Trustee will act as Paying Agent for payments with respect to Debt Securities
which are issuable solely as Registered Securities and the Company will maintain
a Paying Agent outside the United States for payments with respect to Debt
Securities (subject to limitations described above in the case of Bearer
Securities) which are issuable solely as Bearer Securities or as both Registered
Securities and Bearer Securities. Any Paying Agents outside the United States
and any other Paying Agents in the United States initially designated by the
Company for the Debt Securities will be named in an applicable Prospectus
Supplement. The Company may at any time designate additional Paying Agents or
rescind the designation of any Paying Agent or approve a change in the office
through which any Paying Agent acts, except that, if Debt Securities of a series
are issuable solely as Registered Securities, the Company will be required to
maintain a Paying Agent in each Place of Payment for such series and, if Debt
Securities of a series are issuable as Bearer Securities, the Company will be
required to maintain (i) a Paying Agent in the Borough of Manhattan, City of New
York for principal payments with respect to any Registered Securities of the
series (and for payments with respect to Bearer Securities of the series in the
circumstances described above, but not otherwise), and (ii) a Paying Agent in a
Place of Payment located outside the United States where Debt Securities of such
series and any coupons appertaining thereto may be presented and surrendered for
payment. (Section 1002)
 
     All moneys paid by the Company to a Paying Agent for the payment of
principal of and any premium or interest on any Debt Security which remain
unclaimed at the end of two years after such principal, premium or interest
shall have become due and payable will (subject to applicable escheat laws) be
repaid to the Company, and the Holder of such Debt Security or any coupon will
thereafter look only to the Company for payment thereof. (Section 1003)
 
                                        7
<PAGE>   10
 
  Global Debt Securities
 
     Debt Securities of a series may be issued in whole or in part in the form
of one or more global Debt Securities that will be deposited with, or on behalf
of, a depository identified in the Prospectus Supplement relating to such
series. Global Debt Securities may be issued in either registered or bearer form
and in either temporary or permanent form. (Section 203) Unless and until it is
exchanged in whole or in part for the individual Debt Securities represented
thereby, a global Debt Security may not be transferred except as a whole by the
depository for such global Debt Security to a nominee of such depository or by a
nominee of such depository to such depository or another nominee of such
depository or by the depository or any nominee to a successor depository or any
nominee of such successor.
 
     The specific terms of the depository arrangement with respect to a series
of Debt Securities and certain limitations and restrictions relating to a series
of Bearer Securities in the form of one or more global Debt Securities will be
described in the Prospectus Supplement relating to such series.
 
  Events of Default
 
     Any one of the following events constitutes an Event of Default under each
Indenture with respect to Debt Securities of any series: (a) failure to pay any
interest on any Debt Security of that series when due, continued for 30 days;
(b) failure to pay principal of or any premium on any Debt Security of that
series when due; (c) failure to deposit any sinking fund payment, when due, in
respect of any Debt Security of that series; (d) failure to perform any other
covenant of the Company in such Indenture (other than a covenant included in
such Indenture solely for the benefit of a series of any Debt Securities other
than that series), continued for 60 days after written notice as provided in
such Indenture; (e) certain events in bankruptcy, insolvency or reorganization
involving the Company and (f) any other Event of Default provided with respect
to Debt Securities of that series. (Section 501)
 
     If an Event of Default with respect to Debt Securities of any series at the
time Outstanding occurs and is continuing, either the Trustee or the Holders of
at least 25% in aggregate principal amount of the Outstanding Securities of that
series by notice as provided in the applicable Indenture may declare the
principal amount (or, if the Debt Securities of that series are Original Issue
Discount Securities, such portion of the principal amount as may be specified in
the terms of that series) of all the Debt Securities of that series to be due
and payable immediately. At any time after a declaration of acceleration with
respect to Debt Securities of any series has been made, but before a judgment or
decree for payment of money has been obtained by the Trustee, the Holders of a
majority in aggregate principal amount of the Outstanding Securities of that
series may, under certain circumstances, rescind and annul such acceleration.
(Section 502)
 
     Each Indenture provides that, subject to the duty of the Trustee during
default to act with the required standard of care, the Trustee is under no
obligation to exercise any of its rights or powers under such Indenture at the
request or direction of any of the Holders, unless such Holders shall have
offered to the Trustee reasonable indemnity. (Sections 601, 603) Subject to such
provisions for the indemnification of the Trustee, the Holders of a majority in
aggregate principal amount of the Outstanding Securities of any series have the
right to direct the time, method and place of conducting any proceeding for any
remedy available to the Trustee, or exercising any trust or power conferred on
the Trustee, with respect to the Debt Securities of that series; provided,
however, that the Trustee is not obligated to take any action unduly prejudicial
to Holders not joining in such direction or involving the Trustee in personal
liability. (Section 512)
 
     The Company is required to furnish to the Trustee annually a statement as
to the performance by the Company of its obligations under each Indenture and as
to any default in such performance. (Section 1006)
 
  Defeasance
 
     If so specified with respect to any particular series of Debt Securities
issued under an Indenture, the Company may discharge its indebtedness and its
obligations or certain of its obligations under such Indenture with respect to
such series by depositing funds or obligations issued or guaranteed by the
United States of America with the Trustee. (Sections 1301-1303)
 
                                        8
<PAGE>   11
 
     Legal Defeasance and Discharge. Each Indenture provides that, if so
specified with respect to the Debt Securities of any series issued under such
Indenture (other than convertible Subordinated Debt Securities), the Company
(and, if applicable, the Subsidiary Guarantors) will be discharged from any and
all obligations in respect of the Debt Securities of such series (except for
certain obligations relating to temporary Debt Securities and exchange of Debt
Securities, registration of transfer or exchange of Debt Securities of such
series, replacement of stolen, lost or mutilated Debt Securities of such series,
maintenance of paying agencies to hold moneys for payment in trust and payment
of additional amounts, if any, required in consequence of United States
withholding taxes imposed on payments to non-United States persons) upon the
deposit with the Trustee, in trust, of money and/or U.S. Government Obligations
which through the payment of interest and principal in respect thereof in
accordance with their terms will provide money in an amount sufficient to pay
the principal of (and premium, if any), and each installment of interest on, the
Debt Securities of such series on the Stated Maturity of such payments in
accordance with the terms of such Indenture and the Debt Securities of such
series. (Sections 1302, 1304) Such a trust may only be established if, among
other things, the Company has delivered to the Trustee an Opinion of Counsel to
the effect that (i) the Company has received from, or there has been published
by, the Internal Revenue Service a ruling, or (ii) since the date of such
Indenture there has been a change in applicable federal income tax law, in
either case to the effect that, and based thereon such Opinion of Counsel shall
confirm that, the Holders of such series will not recognize income, gain or loss
for federal income tax purposes as a result of such deposit, defeasance and
discharge, and will be subject to federal income tax on the same amounts and in
the same manner and at the same times as would have been the case if such
deposit, defeasance and discharge had not occurred. (Section 1304) In the event
of any such defeasance and discharge of Debt Securities of such series, Holders
of such series would be entitled to look only to such trust fund for payment of
principal of and any premium and any interest on their Debt Securities until
Maturity.
 
     Covenant Defeasance. Each Indenture also provides that, if so specified
with respect to the Debt Securities of any series issued thereunder, the Company
may omit to comply with certain restrictive covenants, and any such omission
shall not be an Event of Default with respect to the Debt Securities of such
series, upon the deposit with the Trustee, in trust, of money and/or U.S.
Government Obligations which through the payment of interest and principal in
respect thereof in accordance with their terms will provide money in an amount
sufficient to pay the principal of (and premium, if any), and each installment
of interest on, the Debt Securities of such series on the Stated Maturity of
such payments in accordance with the terms of such Indenture and the Debt
Securities of such series. The obligations of the Company under such Indenture
and the Debt Securities of such series other than with respect to such covenants
shall remain in full force and effect. (Section 1303) Such a trust may be
established only if, among other things, the Company has delivered to the
Trustee an Opinion of Counsel to the effect that the Holders of such series will
not recognize income, gain or loss for federal income tax purposes as a result
of such deposit and covenant defeasance and will be subject to federal income
tax on the same amounts and in the same manner and at the same times as would
have been the case if such deposit and covenant defeasance had not occurred.
(Section 1304)
 
     Although the amount of money and U.S. Government Obligations on deposit
with the Trustee would be intended to be sufficient to pay amounts due on the
Debt Securities of such series at the time of their Stated Maturity, in the
event the Company exercises its option to omit compliance with the covenants
defeased with respect to the Debt Securities of any series as described above,
and the Debt Securities of such series are declared due and payable because of
the occurrence of any Event of Default, such amount may not be sufficient to pay
amounts due on the Debt Securities of such series at the time of the
acceleration resulting from such Event of Default. The Company shall in any
event remain liable for such payments as provided in the applicable Indenture.
 
     Federal Income Tax Consequences. Under current United States federal income
tax law, defeasance and discharge would likely be treated as a taxable exchange
of Debt Securities to be defeased for an interest in the defeasance trust. As a
consequence, a holder would recognize gain or loss equal to the difference
between the holder's cost or other tax basis for such Debt Securities and the
value of the holder's interest in the defeasance trust, and thereafter would be
required to include in income the holder's share of the income, gain or loss of
 
                                        9
<PAGE>   12
 
the defeasance trust. Under current United States federal income tax law,
covenant defeasance would ordinarily not be treated as a taxable exchange of
such Debt Securities.
 
  Meetings, Modification and Waiver
 
     Modifications and amendments of any Indenture may be made by the Company,
the Subsidiary Guarantors and the Trustee with the consent of the Holders of a
majority in aggregate principal amount of the Outstanding Securities of each
series affected by such modification or amendment; provided, however, that no
such modification or amendment may, without consent of the Holder of each
Outstanding Security affected thereby, (a) change the Stated Maturity of the
principal of, or any installment of principal of or interest on, any Debt
Security, (b) change the Redemption Date with respect to any Debt Security, (c)
reduce the principal amount of, or premium or interest on, any Debt Security,
(d) change any obligation of the Company to pay additional amounts, (e) reduce
the amount of principal of an Original Issue Discount Security payable upon
acceleration of the Maturity thereof, (f) change the coin or currency in which
any Debt Security or any premium or interest thereon is payable, (g) change the
redemption right of any Holder, (h) impair the right to institute suit for the
enforcement of any payment on or with respect to any Debt Security or any
conversion right with respect thereto, (i) reduce the percentage in principal
amount of Outstanding Securities of any series, the consent of whose Holders is
required for modification or amendment of such Indenture or for waiver of
compliance with certain provisions of such Indenture or for waiver of certain
defaults, (j) reduce the requirements contained in such Indenture for quorum or
voting, (k) change any obligation of the Company to maintain an office or agency
in the places and for the purposes required by such Indenture, (l) adversely
affect the right to convert Subordinated Debt Securities, if applicable, or (m)
modify any of the above provisions. (Section 902)
 
     The Subordinated Debt Indenture may not be amended to alter the
subordination of any outstanding Subordinated Debt Securities without the
consent of each holder of Senior Indebtedness (as defined below under
"-- Provisions Applicable Solely to Subordinated Debt Securities") then
outstanding that would be adversely affected thereby. (Section 907 of the
Subordinated Debt Indenture)
 
     The Holders of a majority in aggregate principal amount of the Outstanding
Securities of each series may, on behalf of all Holders of that series, waive,
insofar as that series is concerned, compliance by the Company with certain
restrictive provisions of the Indenture under which such series has been issued.
(Section 1007) The Holders of a majority in aggregate principal amount of the
Outstanding Securities of each series may, on behalf of all Holders of that
series, waive any past default under the applicable Indenture with respect to
any Debt Securities of that series, except a default (a) in the payment of
principal of, or premium, if any, or any interest on any Debt Security of such
series or (b) in respect of a covenant or provision of such Indenture which
cannot be modified or amended without the consent of the Holder of each
Outstanding Security of such series affected. (Section 513)
 
     Each Indenture provides that in determining whether the Holders of the
requisite principal amount of the Outstanding Securities have given any request,
demand, authorization, direction, notice, consent or waiver thereunder or are
present at a meeting of the Holders for quorum purposes, (i) the principal
amount of an Original Issue Discount Security that is deemed to be Outstanding
will be the amount of the principal that would be due and payable as of the date
of such determination upon acceleration of the Maturity thereof, and (ii) the
principal amount of a Debt Security denominated in a foreign currency or
currency units will be the U.S. dollar equivalent, determined on the date of
original issuance of such Debt Security, of the principal amount of such Debt
Security or, in the case of an Original Issue Discount Security, the U.S. dollar
equivalent, determined on the date of original issuance of such Security, of the
amount determined as provided in (i) above. (Section 101)
 
     Each Indenture contains provisions for convening meetings of the Holders of
a series if Debt Securities of that series are issuable as Bearer Securities.
(Section 1401) A meeting may be called at any time by the Trustee, and also,
upon request, by the Company or the Holders of at least 10% in aggregate
principal amount of the Outstanding Securities of such series, in any such case
upon notice given in accordance with "Notices" below. (Section 1402) Except for
any consent which must be given by the Holder of each Outstanding
 
                                       10
<PAGE>   13
 
Security affected thereby, as described above, any resolution presented at a
meeting (or adjourned meeting at which a quorum is present) may be adopted by
the affirmative vote of the Holders of a majority in aggregate principal amount
of the Outstanding Securities of that series; provided, however, that any
resolution with respect to any request, demand, authorization, direction,
notice, consent, waiver or other action which may be made, given or taken by the
Holders of a specified percentage, which is less than a majority, in aggregate
principal amount of the Outstanding Securities of a series may be adopted at a
meeting (or adjourned meeting duly reconvened at which a quorum is present) by
the affirmative vote of the Holders of such specified percentage in aggregate
principal amount of the Outstanding Securities of that series. Any resolution
passed or decision taken at any meeting of Holders of any series duly held in
accordance with the applicable Indenture will be binding on all Holders of that
series and related coupons. The quorum at any meeting, and at any reconvened
meeting, will be Persons holding or representing a majority in aggregate
principal amount of the Outstanding Securities of a series. (Section 1404)
 
  Consolidation, Merger and Sale of Assets
 
     The Company, without the consent of the Holders of any of the outstanding
Securities under either Indenture, may consolidate with or merge into, or
convey, transfer or lease its assets substantially as an entirety to, any Person
which is a corporation, partnership or trust organized and validly existing
under the laws of any jurisdiction of the United States, provided that any
successor Person assumes the Company's obligations on the Securities and under
such Indenture, that after giving effect to the transaction no Event of Default,
and no event which, after notice or lapse of time, would become an Event of
Default, shall have occurred and be continuing, and that certain other
conditions are met. (Section 801)
 
  Notices
 
     Except as otherwise provided in the Indentures, notices to Holders of
Bearer Securities will be given by publication at least twice in a daily
newspaper in The City of New York and in such other city or cities as may be
specified in such Bearer Securities. Notices to Holders of Registered Securities
will be given by mail to the addresses of such Holders as they appear in the
Security Register. (Section 106)
 
  Title
 
     Title to any Bearer Securities (including Bearer Securities in permanent
global form) and any coupons appertaining thereto will pass by delivery. The
Company, the Trustee and any agent of the Company or the Trustee may treat the
bearer of any Bearer Security and the bearer of any coupon and the registered
owner of any Registered Security as the owner thereof (whether or not such Debt
Security or coupon shall be overdue and notwithstanding any notice to the
contrary) for the purpose of making payment and for all other purposes. (Section
308)
 
  Replacement of Securities and Coupons
 
     Any mutilated Debt Security or a Debt Security with a mutilated coupon
appertaining thereto will be replaced by the Company at the expense of the
Holder upon surrender of such Debt Security to the Trustee. Debt Securities or
coupons that became destroyed, stolen or lost will be replaced by the Company at
the expense of the Holder upon delivery to the Trustee of evidence of
destruction, loss or theft thereof satisfactory to the Company and the Trustee;
in the case of any coupon which becomes destroyed, stolen or lost, such coupon
will be replaced by issuance of a new Debt Security in exchange for the Debt
Security to which such coupon appertains. In the case of a destroyed, lost or
stolen Debt Security or coupon, an indemnity satisfactory to the Trustee and the
Company may be required at the expense of the Holder of such Debt Security or
coupon before a replacement Debt Security will be issued. (Section 306)
 
  Governing Law
 
     The Indentures, the Debt Securities and coupons and any Subsidiary
Guarantees will be governed by, and construed in accordance with, the laws of
the State of New York. (Section 113)
 
                                       11
<PAGE>   14
 
  Regarding the Trustee
 
     The Trustee under each Indenture is Chase Bank of Texas, National
Association.
 
     Each Indenture contains certain limitations on the right of the Trustee,
should it become a creditor of the Company, to obtain payment of claims in
certain cases, or to realize for its own account on certain property received in
respect of any such claim as security or otherwise. (Section 613) The Trustee is
permitted to engage in certain other transactions; however, if it acquires any
conflicting interest (as described in the Indentures), it must eliminate such
conflict or resign. (Section 608)
 
PROVISIONS APPLICABLE SOLELY TO SENIOR DEBT SECURITIES
 
     Senior Debt Securities will be issued under the Senior Debt Indenture, and
each series will rank pari passu as to the right of payment of principal and any
premium and interest with each other series issued thereunder. (Section 301)
 
     If the Senior Debt Securities are issued on a senior subordinated basis,
the applicable Prospectus Supplement will describe the related subordination
provisions. All Senior Debt Securities, whether issued on a senior or senior
subordinated basis, will be senior in right of payment to each series of
Subordinated Debt Securities.
 
PROVISIONS APPLICABLE SOLELY TO SUBORDINATED DEBT SECURITIES
 
     Subordination. The Subordinated Debt Securities will be subordinate and
junior in right of payment, to the extent set forth in the Subordinated Debt
Indenture, to all Senior Indebtedness (as defined below) of the Company.
(Article Sixteen of the Subordinated Debt Indenture)
 
     "Senior Indebtedness" is defined in Section 101 of the Subordinated Debt
Indenture as Indebtedness (as defined below) of the Company, whether outstanding
on the date of the Subordinated Debt Indenture or thereafter created, incurred,
assumed, guaranteed or in effect guaranteed by the Company, unless the
instrument creating or evidencing such Indebtedness provides that such
Indebtedness is not senior or superior, in right of payment, to the Subordinated
Debt Securities or to other Indebtedness which is pari passu with, or
subordinated to, the Subordinated Debt Securities; provided, however, that in no
event shall Senior Indebtedness include (a) Indebtedness of the Company owed or
owing to any Subsidiary of the Company, (b) Indebtedness to trade creditors, (c)
any liability for taxes owed or owing by the Company, and (d) the Subordinated
Debt Securities. "Indebtedness" is defined in Section 101 of the Subordinated
Debt Indenture as, with respect to any Person, (a) all liabilities and
obligations, contingent or otherwise, of any such Person, (i) in respect of
borrowed money (whether or not the recourse of the lender is to the whole of the
assets of such Person or only to a portion thereof), (ii) evidenced by bonds,
notes, debentures or similar instruments, (iii) representing the balance
deferred and unpaid of the purchase price of any property or services, except
such as would constitute trade payables to trade creditors in the ordinary
course of business, (iv) evidenced by bankers' acceptances or similar
instruments issued or accepted by banks, (v) for the payment of money relating
to a Capitalized Lease Obligation, or (vi) evidenced by a letter of credit or a
reimbursement obligation of such Person with respect to any letter of credit;
(b) all obligations of such Person under Interest Swap and Hedging Obligations;
(c) all liabilities of others of the kind described in the preceding clause (a)
or (b) that such Person has guaranteed or that is otherwise its legal liability
and all obligations to purchase, redeem or acquire any Capital Stock; and (d)
any and all deferrals, renewals, extensions, refinancings, refundings (whether
direct or indirect) of any liability of the kind described in any of the
preceding clause (a), (b) or (c), or this clause (d), whether or not between or
among the same parties.
 
     The Subordinated Debt Indenture provides that no payment may be made by the
Company on account of the principal of or any premium or interest on the
Subordinated Debt Securities, or to acquire any of the Subordinated Debt
Securities (including repurchases of Subordinated Debt Securities at the option
of the Holders) for cash or property (other than Junior Securities), or on
account of any redemption provisions of the Subordinated Debt Securities, (i)
upon the maturity of any Senior Indebtedness of the Company by lapse of time,
acceleration (unless waived) or otherwise, unless and until all principal of and
any premium and
 
                                       12
<PAGE>   15
 
interest on such Senior Indebtedness are first paid in full (or such payment is
duly provided for), or (ii) in the event of default in the payment of any
principal of or any premium or interest on any Senior Indebtedness when it
becomes due and payable, whether at maturity or at a date fixed for prepayment
or by declaration or otherwise (a "Payment Default"), unless and until such
Payment Default has been cured or waived or otherwise has ceased to exist.
(Section 1601 of the Subordinated Debt Indenture)
 
     Upon (i) the happening of an event of default (other than a Payment
Default) that permits the holders of Senior Indebtedness or their representative
immediately to accelerate its maturity and (ii) written notice of such event of
default given to the Company and the Trustee by the holders of at least 25% in
the aggregate principal amount outstanding of such Senior Indebtedness or their
representative (a "Payment Notice"), then, unless and until such event of
default has been cured or waived or otherwise has ceased to exist, no payment
(by set off or otherwise) may be made by or on behalf of the Company on account
of the principal of or any premium or interest on the Subordinated Debt
Securities, or to acquire or repurchase any of the Subordinated Debt Securities
for cash or property, or on account of any redemption provisions of the
Subordinated Debt Securities, in any such case other than payments made with
Junior Securities of the Company. Notwithstanding the foregoing, unless (i) the
Senior Indebtedness in respect of which such event of default exists has been
declared due and payable in its entirety within 179 days after the Payment
Notice is delivered as set forth above (the "Payment Blockage Period"), and (ii)
such declaration has not been rescinded or waived, at the end of the Payment
Blockage Period, the Company shall be required to pay all sums not paid to the
Holders of the Subordinated Debt Securities during the Payment Blockage Period
due to the foregoing prohibitions and to resume all other payments as and when
due on the Subordinated Debt Securities. Any number of Payment Notices may be
given; provided, however, that (i) not more than one Payment Notice shall be
given within a period of any 360 consecutive days and (ii) no event of default
that existed upon the date of such Payment Notice or the commencement of such
Payment Blockage Period (whether or not such event of default is on the same
issue of Senior Indebtedness) shall be made the basis for the commencement of
any other Payment Blockage Period. (Section 1601 of the Subordinated Debt
Indenture)
 
     Upon any distribution of assets of the Company upon any dissolution,
winding up, liquidation or reorganization of the Company, whether voluntary or
involuntary, in bankruptcy, insolvency, receivership or a similar proceeding or
upon assignment for the benefit of creditors or any marshaling of assets or
liabilities, (i) the holders of all Senior Indebtedness will first be entitled
to receive payment in full (or have such payment duly provided for) before the
Holders are entitled to receive any payment on account of the principal of or
any premium or interest on the Subordinated Debt Securities (other than Junior
Securities) and (ii) any payment or distribution of assets of the Company of any
kind or character, whether in cash, property or securities (other than Junior
Securities) to which the Holders or the Trustee on behalf of the Holders would
be entitled (by set off or otherwise), except for the subordination provisions
contained in the Subordinated Debt Indenture, will be paid by the liquidating
trustee or agent or other Person making such a payment or distribution directly
to the holders of Senior Indebtedness or their representative to the extent
necessary to make payment in full of all such Senior Indebtedness remaining
unpaid, after giving effect to any concurrent payment or distribution to the
holders of such Senior Indebtedness. (Section 1601 of the Subordinated Debt
Indenture)
 
     In the event that, notwithstanding the foregoing, any payment or
distribution of assets of the Company (other than Junior Securities) is received
by the Trustee or the Holders at a time when such payment or distribution is
prohibited by the foregoing provisions, such payment or distribution shall be
held in trust for the benefit of the holders of Senior Indebtedness, and shall
be paid or delivered by the Trustee or such Holders, as the case may be, to the
holders of the Senior Indebtedness remaining unpaid or unprovided for or their
representative or representatives, or to the trustee or trustees under any
indenture pursuant to which any instruments evidencing any of such Senior
Indebtedness may have been issued, ratably according to the aggregate amounts
remaining unpaid on account of the Senior Indebtedness held or represented by
each, for application to the payment of all Senior Indebtedness remaining
unpaid, to the extent necessary to pay or to provide for the payment of all such
Senior Indebtedness in full after giving effect to any concurrent payment or
distribution to the holders of such Senior Indebtedness. (Section 1601 of the
Subordinated Debt Indenture)
 
                                       13
<PAGE>   16
 
     No provisions contained in the Subordinated Debt Indenture or the
Subordinated Debt Securities will affect the obligation of the Company, which is
absolute and unconditional, to pay, when due, principal of and any premium and
interest on the Subordinated Debt Securities as and when the same shall become
due and payable. The subordination provisions of the Subordinated Debt Indenture
and the Subordinated Debt Securities will not prevent the occurrence of any
Event of Default under the Subordinated Debt Indenture or limit the rights of
the Trustee or any Holder, subject to the three preceding paragraphs, to pursue
any other rights or remedies with respect to the Subordinated Debt Securities.
(Sections 501 and 1601 of the Subordinated Debt Indenture)
 
     The Prospectus Supplement respecting any series of Subordinated Debt
Securities will set forth any subordination provisions applicable to such series
in addition to or different from those described above.
 
     If any series of Subordinated Debt Securities is guaranteed by Subsidiary
Guarantees, then, except as otherwise specified in the applicable Prospectus
Supplement, the obligations of each Subsidiary Guarantor under such Subsidiary
Guarantees will be subordinated to the Senior Indebtedness of such Subsidiary
Guarantor to the same extent and in the same manner as the Subordinated Debt
Securities are subordinated to Senior Indebtedness of the Company. (Section 1611
of the Subordinated Debt Indenture)
 
     By reason of such subordination, in the event of the liquidation,
bankruptcy, reorganization, insolvency, receivership or similar proceeding
involving the Company or an assignment for the benefit of creditors of the
Company or any of its subsidiaries or a marshaling of assets or liabilities of
the Company or its subsidiaries, holders of Senior Indebtedness and holders of
other obligations of the Company that are not subordinated to Senior
Indebtedness may receive more, ratably, than holders of the Subordinated Debt
Securities. Such subordination will not prevent the occurrence of any Default or
Event of Default or limit the rights of the Trustee or any Holder, subject to
the other provisions of the Indenture, to pursue any other rights or remedies
with respect of the Subordinated Debt Securities.
 
     Conversion. The Subordinated Debt Indenture may provide for a right of
conversion of Subordinated Debt Securities into Common Stock (or cash in lieu
thereof). (Sections 301 and 1501 of the Subordinated Debt Indenture) The
following provisions will apply to Debt Securities that are convertible
Subordinated Debt Securities unless otherwise provided in the Prospectus
Supplement for such Debt Securities.
 
     The Holder of any convertible Subordinated Debt Securities will have the
right exercisable at any time prior to the close of business on the second
Business Day prior to their Stated Maturity, unless previously redeemed or
otherwise purchased by the Company, to convert such Subordinated Debt Securities
into shares of Common Stock at the Conversion Price set forth in the Prospectus
Supplement, subject to adjustment. The Holder of convertible Subordinated Debt
Securities may convert any portion thereof which is $1,000 in principal amount
or any integral multiple thereof. (Section 1502 of the Subordinated Debt
Indenture)
 
     In certain events, the Conversion Price may be subject to adjustment as set
forth in the applicable Prospectus Supplement for such Subordinated Debt
Securities.
 
     Fractional shares of Common Stock will not be issued upon conversion, but,
in lieu thereof, the Company will pay a cash adjustment based on the then
current market price for the Common Stock. (Section 1503 of the Subordinated
Debt Indenture) Upon conversion, no adjustments will be made for accrued
interest or dividends, and convertible Subordinated Debt Securities surrendered
for conversion between the record date for an interest payment and the Interest
Payment Date (except convertible Subordinated Debt Securities called for
redemption on a redemption date during such period) must be accompanied by
payment of an amount equal to the interest thereon which the Holder is to
receive. (Section 1502 of the Subordinated Debt Indenture)
 
     In the case of any reclassification, consolidation or merger of the Company
with or into another Person or any merger of another Person with or into the
Company (with certain exceptions), or in case of any conveyance, transfer or
lease of the assets of the Company substantially as an entirety, each
convertible Subordinated Debt Security then outstanding will, without the
consent of any Holder thereof, become convertible only into the kind and amount
of securities, cash and other property receivable upon such reclassification,
consolidation, merger, conveyance, transfer or lease by a holder of the number
of shares of
 
                                       14
<PAGE>   17
 
Common Stock into which such Subordinated Debt Security was convertible
immediately prior thereto, after giving effect to any adjustment event, who
failed to exercise any rights of election and received per share the kind and
amount received per share by a plurality of non-electing shares. (Section 1505
of the Subordinated Debt Indenture)
 
                DESCRIPTION OF COMMON STOCK AND PREFERRED STOCK
 
     The Company's authorized capital stock consists of 200,000,000 shares of
Common Stock, par value $.01 per share, and 20,000,000 shares of Preferred
Stock, par value $.01 per share, each of which is described below. The summary
description of the capital stock of the Company contained herein is necessarily
general and reference should be made in each case to the Company's Restated
Articles of Incorporation and Bylaws, which are exhibits to the Registration
Statement of which this Prospectus is a part.
 
COMMON STOCK
 
     Each share of Common Stock is subject to all rights, privileges,
preferences and priorities of any class of preferred stock of the Company. Each
share of Common Stock has an equal and ratable right to receive dividends as and
when declared by the Board of Directors out of any funds of the corporation
legally available for the payment thereof. The Company currently has no
intention to pay dividends on the shares of Common Stock in the foreseeable
future.
 
     In the event of a liquidation, dissolution or winding up of the Company,
the holders of Common Stock are entitled to share equally and ratably in the
assets available for distribution after payment of all liabilities, including
any liquidation preferences payable to the holders of Preferred Stock that may
at the time be outstanding.
 
     Each share of Common Stock is entitled to one vote in the election of
directors and on all other matters submitted to a vote of shareholders. Holders
of Common Stock have no right to cumulate their vote in the election of
directors.
 
     American Stock Transfer & Trust Company, 40 Wall Street, New York, New York
10005, acts as the transfer agent and registrar of the Common Stock.
 
PREFERRED SHARE PURCHASE RIGHTS
 
     On November 8, 1996, the Board of Directors of the Company authorized the
issuance of one preferred share purchase right (a "Right") for each share of
Common Stock outstanding on November 20, 1996 and for each share of Common Stock
issued thereafter until the Distribution Date (as defined below) or the earlier
redemption or expiration of the Rights. Each Right entitles the registered
holder to purchase from the Company one one-thousandth of a share of Junior
Participating Preferred Stock, par value $.01 per share (the "Junior Preferred
Shares"), of the Company, at a price of $56.00 per one one-thousandth of a
Junior Preferred Share (the "Purchase Price"), subject to adjustment. The
description and terms of the Rights are set forth in a Rights Agreement (the
"Rights Agreement") dated as of November 15, 1996 between the Company and
American Stock Transfer & Trust Company, as Rights Agent (the "Rights Agent"),
and this description of the Rights is qualified in its entirety by reference to
such agreement, which is included as an exhibit to the Registration Statement of
which this Prospectus is a part.
 
     Until the Distribution Date, the Rights will attach to all Common Stock
certificates representing outstanding shares and no separate Right Certificate
will be distributed. Accordingly, a Right will be issued for each share of
Common Stock issued hereunder. The Rights will separate from the shares of
Common Stock and a Distribution Date will occur upon the earlier of (i) 10
business days following a public announcement that a person or group of
affiliated or associated persons (an "Acquiring Person") has acquired beneficial
ownership of 15% or more of the outstanding Voting Shares (as defined in the
Rights Agreement) of the Company, or (ii) 10 business days following the
commencement or announcement of an intention to commence a tender offer or
exchange offer the consummation of which would result in the beneficial
ownership by a person or group of 15% or more of such outstanding Voting Shares.
 
                                       15
<PAGE>   18
 
     Until the Distribution Date (or earlier redemption or expiration of the
Rights) the Rights will be evidenced by the certificates representing such
Common Stock. As soon as practicable following the Distribution Date, separate
certificates evidencing the Rights (the "Right Certificates") will be mailed to
holders of record of the shares of Common Stock as of the close of business on
the Distribution Date and such separate Right Certificates alone will thereafter
evidence the Rights. The Rights are not exercisable until the Distribution Date.
The Rights will expire on November 19, 2006 (the "Final Expiration Date"),
unless the Final Expiration Date is extended or the Rights are earlier redeemed
or exchanged by the Company as described below.
 
     If a person or group were to acquire 15% or more of the Voting Shares of
the Company, each Right then outstanding (other than Rights beneficially owned
by the Acquiring Person, which would become null and void) would become a right
to buy for the Purchase Price that number of shares of Common Stock (or under
certain circumstances, the equivalent number of one one-thousandths of a Junior
Preferred Share) that at the time of such acquisition would have a market value
of two times the Purchase Price of the Right. If the Company were acquired in a
merger or other business combination transaction or assets constituting more
than 50% of its consolidated assets or producing more than 50% of its earning
power or cash flow were sold, proper provision will be made so that each holder
of a Right will thereafter have the right to receive, upon the exercise thereof
at the then current Purchase Price of the Right, that number of shares of common
stock of the acquiring company which at the time of such transaction would have
a market value of two times the Purchase Price of the Right.
 
     The dividend and liquidation rights, and the non-redemption feature, of the
Junior Preferred Shares are designed so that the value of one one-thousandth of
a Junior Preferred Share purchasable upon exercise of each Right will
approximate the value of one Common Stock. The Junior Preferred Shares issuable
upon exercise of the Rights will be non-redeemable and rank junior to all other
series of the Company's preferred stock. Each whole Junior Preferred Share will
be entitled to receive a quarterly preferential dividend in an amount per share
equal to the greater of (i) $1.00 in cash, or (ii) in the aggregate, 1,000 times
the dividend declared on the shares of Common Stock. In the event of
liquidation, the holders of the Junior Preferred Shares will be entitled to
receive a preferential liquidation payment equal to the greater of (i) $1,000
per share, or (ii) in the aggregate, 1,000 times the payment made on the shares
of Common Stock. In the event of any merger, consolidation or other transaction
in which shares of Common Stock are exchanged for or changed into other stock or
securities, cash or other property, each whole Junior Preferred Share will be
entitled to receive 1,000 times the amount received per Common Stock. Each whole
Junior Preferred Share will be entitled to 1,000 votes on all matters submitted
to a vote of the stockholders of the Company, and Junior Preferred Shares will
generally vote together as one class with the Common Stock and any other capital
stock on all matters submitted to a vote of shareholders of the Company.
 
     If required, the offer and sale of the Junior Preferred Shares issuable
upon exercise of the Rights will be registered under the Securities Act at such
time as the Rights become exercisable.
 
     The number of one one-thousandths of a Junior Preferred Share or other
securities or property issuable upon exercise of the Rights, and the Purchase
Price payable, are subject to customary adjustments from time to time to prevent
dilution. The number of outstanding Rights and the number of one one-thousandths
of a Junior Preferred Share issuable upon exercise of each Right are also
subject to adjustment in the event of a stock split of the shares of Common
Stock or a stock dividend on the shares of Common Stock payable in shares of
Common Stock or subdivisions, consolidations or combinations of the shares of
Common Stock occurring, in any such case, prior to the Distribution Date.
 
     At any time after the acquisition by a person or group of affiliated or
associated persons of beneficial ownership of 15% or more of the outstanding
Voting Shares of the Company and before the acquisition by a person or group of
50% or more of the outstanding Voting Shares of the Company, the Board of
Directors may, at its option, issue shares of Common Stock in mandatory
redemption of, and in exchange for, all or part of the then outstanding and
exercisable Rights (other than Rights owned by such person or group which would
become null and void) at an exchange ratio of one share of Common Stock (or one
one-thousandth of a
 
                                       16
<PAGE>   19
 
Junior Preferred Share) for each two shares of Common Stock for which each Right
is then exercisable, subject to adjustment.
 
     At any time prior to the first public announcement that a person or group
has become the beneficial owner of 15% or more of the outstanding Voting Shares,
the Board of Directors of the Company may redeem all but not less than all the
then outstanding Rights at a price of $0.01 per Right (the "Redemption Price").
The redemption of the Rights may be made effective at such time, on such basis
and with such conditions as the Board of Directors in its sole discretion may
establish. Immediately upon the action of the Board of Directors ordering
redemption of the Rights, the right to exercise the Rights will terminate and
the only right of the holders of Rights will be to receive the Redemption Price.
 
     Until a Right is exercised, the holder thereof, as such, will have no
rights as a shareholder of the Company, including, without limitation, the right
to vote or to receive dividends.
 
     The terms of the Rights may be amended by the Board of Directors of the
Company without the consent of the holders of the Rights, including an amendment
to extend the Final Expiration Date, and, provided a Distribution Date has not
occurred, to extend the period during which the Rights may be redeemed, except
that after the first public announcement that a person or group has become the
beneficial owner of 15% or more of the outstanding Voting Shares, no such
amendment may materially and adversely affect the interests of the holders of
the Rights.
 
     The Rights have certain anti-takeover effects. The Rights will cause
substantial dilution to a person or group that attempts to acquire the Company
on terms not determined by the Board of Directors to be in the best interests of
all shareholders. The Rights will not interfere with a merger or other business
combination approved by the Board of Directors, prior to the time that a person
or group has acquired beneficial ownership of 15% or more of the Common Stock,
since the Rights may be redeemed by the Company prior to that time.
 
PREFERRED STOCK
 
     The following description of the terms of the Preferred Stock sets forth
certain general terms and provisions of the Preferred Stock to which an
applicable Prospectus Supplement may relate. Certain other terms of any series
of Preferred Stock offered by an applicable Prospectus Supplement will be
specified in such Prospectus Supplement. If so specified in the applicable
Prospectus Supplement, the terms of any series of Preferred Stock may differ
from the terms set forth below. The description of the terms of the Preferred
Stock set forth below and in an applicable Prospectus Supplement does not
purport to be complete and is subject to and qualified in its entirety by
reference to the Statement of Resolution relating to the applicable series of
Preferred Stock, which will be filed as an exhibit to, or incorporated by
reference in, the Registration Statement of which this Prospectus forms a part.
 
     General. The Preferred Stock may be divided into and issued in one or more
series, each series to be so designated as to distinguish the shares thereof
from the shares of all other series and classes. The Board of Directors is
vested with the authority to establish and designate such series from time to
time, and within the limitations prescribed by law or set forth in the Company's
Restated Articles of Incorporation, to fix and determine the number,
preferences, limitations and relative rights, including voting rights, of the
authorized shares within each such series; provided, however, that the Board of
Directors may not decrease the number of shares within a series below the number
of shares within such series that is then issued. The Board of Directors shall
exercise such authority by the adoption of a resolution or resolutions as
prescribed by law.
 
     The terms of any series of Preferred Stock may be amended without the
consent of the holders of any other series of Preferred Stock or of any class of
junior stock, provided such amendment does not adversely affect the holders of
such other series of Preferred Stock or class of junior stock. Shares of any
class of Preferred Stock which have been issued and reacquired in any manner and
are not held as treasury shares, including shares redeemed by purchase (whether
through the operation of a retirement or sinking fund or otherwise), will have
the status of authorized and unissued Preferred Stock and may be reissued as a
part of the series of which they were originally a part or may be reclassified
into and reissued as part of a new series.
 
                                       17
<PAGE>   20
 
     No shares of Preferred Stock are, as of the date of this Prospectus, issued
or outstanding, although the Company has issued Rights to purchase Junior
Preferred Shares as described above under "-- Preferred Share Purchase Rights."
It is not possible to state the actual effect of the authorization and issuance
of a new series of Preferred Stock upon the rights of holders of the Common
Stock and other series of Preferred Stock unless and until the Board of
Directors determines the attributes of such new series of Preferred Stock and
the specific rights of its holders. Such effects might include, however, (i)
restrictions on dividends on Common Stock and other series of Preferred Stock if
dividends on such new series of Preferred Stock have not been paid; (ii)
dilution of the voting power of Common Stock and other series of Preferred Stock
to the extent that such new series of Preferred Stock has voting rights, or to
the extent that any such new series of Preferred Stock is convertible into
Common Stock; (iii) dilution of the equity interest of Common Stock and other
series of Preferred Stock; and (iv) limitation on the right of holders of Common
Stock and other series of Preferred Stock to share in the Company's assets upon
liquidation until satisfaction of any liquidation preference attributable to
such new series of Preferred Stock. While the ability of the Company to issue
Preferred Stock provides flexibility in connection with possible acquisitions
and other corporate purposes, its issuance could be used to impede an attempt by
a third party to acquire a majority of the outstanding voting stock of the
Company.
 
     The Preferred Stock will have the dividend, liquidation, redemption and
voting rights set forth below unless otherwise provided in the Prospectus
Supplement relating to a particular series of the Preferred Stock. Reference is
made to the Prospectus Supplement relating to the particular series of the
Preferred Stock offered thereby for specific terms, including: (i) the
designation of such Preferred Stock, the number of shares offered and the
liquidation value thereof; (ii) the price at which such Preferred Stock will be
issued; (iii) the dividend rate (or method of calculation), the dates on which
dividends shall be payable, whether such dividends shall be cumulative or
noncumulative and, if cumulative, the dates from which dividends shall commence
to accumulate; (iv) the liquidation preference thereof; (v) any redemption or
sinking fund provisions; (vi) any conversion or exchange provisions of such
Preferred Stock; and (vii) any additional dividend, liquidation, redemption,
sinking fund and other rights, preferences, limitations and restrictions of such
Preferred Stock.
 
     The Preferred Stock will, when issued, be fully paid and nonassessable.
Unless otherwise specified in the Prospectus Supplement relating to a particular
series of the Preferred Stock, each series of the Preferred Stock will rank on a
parity as to dividends and distributions in the event of a liquidation with each
other series of the Preferred Stock, if any. Holders of Preferred Stock will
have no preemptive rights to subscribe for or purchase shares of capital stock.
 
     Dividend Rights. Holders of the Preferred Stock of each series will be
entitled to receive, when, as and if declared by the Board of Directors, out of
assets of the Company legally available therefor, cash dividends at such rates
and on such dates as are set forth in the Prospectus Supplement relating to such
series of the Preferred Stock. Such rate may be fixed or variable or both. Each
such dividend will be payable to the holders of record as they appear on the
stock books of the Company on such record dates as will be fixed by the Board of
Directors or a duly authorized committee thereof. Dividends on any series of the
Preferred Stock may be cumulative or noncumulative, as provided in the
Prospectus Supplement relating thereto. If the Board of Directors fails to
declare a dividend payable on a dividend payment date on any series of Preferred
Stock for which dividends are noncumulative, then the right to receive a
dividend in respect of the dividend period ending on such dividend payment date
will be lost, and the Company shall have no obligation to pay the dividend
accrued for that period, whether or not dividends are declared for any future
period.
 
     Unless otherwise indicated in an applicable Prospectus Supplement, all
series of Preferred Stock will be senior in right as to dividends and in
liquidation to the Common Stock and any other class of stock of the Company
ranking junior to the Preferred Stock.
 
     Rights Upon Liquidation. In the event of any voluntary or involuntary
liquidation, dissolution or winding up of the Company, the holders of each
series of Preferred Stock will be entitled to receive out of assets of the
Company available for distribution to stockholders, before any distribution of
assets is made to holders of Common Stock or any other class of stock ranking
junior to such series of the Preferred Stock upon
 
                                       18
<PAGE>   21
 
liquidation, liquidating distributions in the amount set forth in the Prospectus
Supplement relating to such series of the Preferred Stock plus an amount equal
to accrued and unpaid dividends for the then-current dividend period and, if
such series of the Preferred Stock is cumulative, for all dividend periods prior
thereto. If, upon any voluntary or involuntary liquidation, dissolution or
winding up of the Company, the amounts payable with respect to the Preferred
Stock of any series and any other shares of stock of the Company ranking as to
any such distribution on a parity with such series of the Preferred Stock are
not paid in full, the holders of the Preferred Stock of such series and of such
other shares will share ratably in any such distribution of assets of the
Company in proportion to the full respective preferential amounts to which they
are entitled. After payment of the full amount of the liquidating distribution
to which they are entitled, the holders of such series of Preferred Stock will
have no right or claim to any of the remaining assets of the Company. Neither
the sale of all or substantially all the property or business of the Company nor
the merger or consolidation of the Company into or with any other corporation
shall be deemed to be a dissolution, liquidation or winding up, voluntary or
involuntary, of the Company.
 
     Redemption. A series of the Preferred Stock may be redeemable, in whole or
in part, at the option of the Company, and may be subject to mandatory
redemption pursuant to a sinking fund, in each case upon terms, at the times and
at the redemption prices set forth in the Prospectus Supplement relating to such
series.
 
     The Prospectus Supplement relating to a series of Preferred Stock that is
subject to mandatory redemption will specify the number of shares of such series
of Preferred Stock that will be redeemed by the Company in each year commencing
after a date to be specified, at a redemption price per share to be specified,
together with an amount equal to any accrued and unpaid dividends thereon to the
date of redemption. The redemption price may be payable in cash, capital stock
or in cash received from the net proceeds of the issuance of capital stock of
the Company, as specified in the Prospectus Supplement relating to such series
of Preferred Stock.
 
     If fewer than all the outstanding shares of any series of the Preferred
Stock are to be redeemed, whether by mandatory or optional redemption, the
selection of the shares to be redeemed will be determined by lot or pro rata as
may be determined by the Board of Directors or a duly authorized committee
thereof, or by any other method which may be determined by the Board of
Directors or such committee to be equitable. From and after the date of
redemption (unless default shall be made by the Company in providing for the
payment of the redemption price), dividends shall cease to accrue on the shares
of Preferred Stock called for redemption and all rights of the holders thereof
(except the right to receive the redemption price) shall cease.
 
     In the event that full dividends, including accumulations in the case of
cumulative Preferred Stock, on any series of the Preferred Stock have not been
paid, such series of the Preferred Stock may not be redeemed in part and the
Company may not purchase or acquire any shares of such series of the Preferred
Stock otherwise than pursuant to a purchase or exchange offer made on the same
terms to all holders of such series of the Preferred Stock.
 
     Conversion or Exchange Rights. The Prospectus Supplement for any series of
the Preferred Stock will state the terms, if any, on which shares of such series
are convertible into, or exchangeable for, securities of the Company or another
person.
 
     Voting Rights. Unless otherwise determined by the Board of Directors and
indicated in the Prospectus Supplement relating to a particular series of
Preferred Stock, the holders of the Preferred Stock will not be entitled to
vote, except as expressly required by applicable law. In the event the Company
issues share of any series of Preferred Stock with voting rights, including any
voting rights in the case of dividend arrearages, unless otherwise specified in
the Prospectus Supplement relating to a particular series of Preferred Stock,
each such share will be entitled to one vote on matters on which holders of such
series of the Preferred Stock are entitled to vote. In the case of any series of
Preferred Stock having one vote per share on matters on which holders of such
series are entitled to vote, the voting power of such series, on matters on
which holders of such series and holders of other series of preferred stock are
entitled to vote as a single class, will depend on the number of shares in such
series, not on the aggregate liquidation preference or initial offering price of
the shares of such series of Preferred Stock.
 
                                       19
<PAGE>   22
 
     Conditions and Restrictions Upon the Company. The Prospectus Supplement
relating to a series of the Preferred Stock will describe any conditions or
restrictions upon the Company which are for the benefit of such series,
including restrictions upon the creation of debt or other series of Preferred
Stock; payment of dividends; or distributions, acquisitions or redemptions of
shares ranking junior to such series.
 
VOTING
 
     The Company's Restated Articles of Incorporation provide that (a) action
may be taken without a meeting, without prior notice, and without a vote, if a
consent or consents in writing, setting forth the action so taken, shall have
been signed by the holder or holders of shares having not less than the minimum
number of votes that would be necessary to take such action at a meeting of the
shareholders, and (b) the vote required to approve a merger, share exchange,
certain sales of assets, charter amendment or dissolution involving the Company
shall be a majority of each outstanding class of capital stock entitled to vote
thereon.
 
NO PREEMPTIVE RIGHTS
 
     No holder of shares of the Company, including shares of Common Stock or
Preferred Stock, shall have any preemptive right or other right to purchase or
subscribe for or receive any shares of any class, or series thereof, of stock of
the Company, whether now or hereafter authorized, or any warrants, options,
bonds, debentures or other securities convertible into, exchangeable for or
carrying any right to purchase any shares of any class, or series thereof, of
stock.
 
BUSINESS COMBINATION LAW
 
     The Company is subject to Part Thirteen of the Texas Business Corporation
Act, known as the "Business Combination Law," which became effective September
1, 1997. In general, the Business Combination Law prevents an "affiliated
shareholder" (or its affiliates or associates) from entering into or engaging in
a "business combination" with an "issuing public corporation" during the
three-year period immediately following the date on which the affiliated
shareholder became an affiliated shareholder, unless (a) before the date such
person became an affiliated shareholder, the board of directors of the issuing
public corporation approves the business combination or the acquisition of
shares that caused the affiliated shareholder to become an affiliated
shareholder, or (b) not less than six months after the date such person became
an affiliated shareholder, the business combination is approved by the
affirmative vote of holders of at least two-thirds of the issuing public
corporation's outstanding voting shares not beneficially owned by the affiliated
shareholder or its affiliates or associates. For the purposes of the foregoing,
"affiliated shareholder" is defined generally as a person that is or was within
the preceding three-year period the beneficial owner of 20% or more of a
corporation's outstanding voting shares; "business combination" is defined
generally to include (i) mergers, share exchanges or conversions involving the
affiliated shareholder, (ii) dispositions of assets involving the affiliated
shareholder having an aggregate value equal to 10% or more of the market value
of the assets or of the outstanding common stock or representing 10% or more of
the earning power or net income of the corporation, (iii) certain issuances or
transfers of securities by the corporation to the affiliated shareholder other
than on a pro rata basis, (iv) certain plans or agreements relating to a
liquidation or dissolution of the corporation involving an affiliated
shareholder, (v) certain reclassifications, recapitalizations, distributions or
other transactions that would have the effect of increasing the affiliated
shareholder's percentage ownership of the corporation and (vi) the receipt of
tax, guarantee, loan or other financial benefits by an affiliated shareholder
other than proportionately as a shareholder of the corporation; and "issuing
public corporation" is generally defined to include most publicly held Texas
corporations, including the Company.
 
FOREIGN OWNERSHIP
 
     The Restated Articles of Incorporation of the Company contain provisions
limiting foreign ownership of the capital stock of the Company. These provisions
were originally intended to, among other things, protect the Company's ability
to be deemed a United States citizen under Section 2 ("U.S. citizen") of the
Shipping Act, 1916, as amended (the "Shipping Act") which allowed the Company to
avail itself of certain types of U.S. government guaranteed financings
previously available only for U.S. flag vessels owned by U.S. citizens.
 
                                       20
<PAGE>   23
 
Although being a U.S. citizen is not currently necessary to obtain such
financings, the ability to be a U.S. citizen may be beneficial in the future
should the Company desire to obtain certain types of U.S. flag vessels. One of
the conditions that must be satisfied in order that a corporation may be deemed
to be a U.S. citizen is that a controlling interest therein is owned by citizens
of the United States. Thus, a transfer of Common Stock which would result in
more than 50% of the outstanding Common Stock being held by non-U.S. citizens
would cause the Company to then be ineligible to be a U.S. citizen. Under the
provisions of the Company's Restated Articles of Incorporation, (i) shares of
any class of capital stock of the Company are not issuable to and are not
registrable upon transfer in the name of any person who cannot demonstrate to
the satisfaction of the Company that such person is a U.S. citizen and is not
holding such shares for the account of any non-U.S. citizen, if as a result of
such issuance or registration of transfer the percentage of such class owned by
non-U.S. citizens would exceed a fixed percentage (the "Permitted Percentage"),
which is equal to 2% less than the percentage that would prevent the Company
from being a U.S. citizen (currently 50%, thus resulting in a Permitted
Percentage of 48%), and any such transfer shall be void and ineffective as
against the Company, and (ii) if at any time non-U.S. ownership of any such
class (either record or beneficial) exceeds the Permitted Percentage, the
Company may withhold payment of dividends on such shares deemed to be in excess
of the Permitted Percentage and may suspend the voting rights of such shares.
The Company's Restated Articles of Incorporation do not prohibit transfers that
would result in the Company's being ineligible to engage in coastwise trade.
 
     In addition to the foregoing, Section 9 of the Shipping Act provides that a
controlling interest in the Company may not be acquired by a non-U.S. citizen
without the consent of the U.S. Secretary of Transportation, acting through the
United States Maritime Administration ("MARAD"). Notwithstanding the provisions
of Section 9, current MARAD regulations authorize the transfer of a controlling
interest in a company as long as the United States is not at war, the transferee
is not a national of a country to which the transfer would be contrary to the
foreign policy of the United States and the Company's U.S. flag vessels remain
documented under the U.S. flag after the transfer. In the absence of MARAD
consent (either by the current regulations or otherwise) the transfer of a
controlling interest in the Company to non-U.S. citizens would enable MARAD to
exercise various remedies under the Shipping Act including seizure of vessels,
civil penalties and, in certain cases, criminal penalties.
 
     Certificates representing the capital stock of the Company bear legends
concerning the restrictions on non-U.S. ownership. In addition, the Board of
Directors is authorized to adopt a bylaw provision for the establishment of a
dual stock certificate systems under which different forms of certificates may
be used to indicate whether or not the owner thereof is a U.S. citizen. To date,
the Board of Directors has not deemed it necessary to adopt such a system.
 
     The restrictions imposed by the Company's Restated Articles of
Incorporation may at times preclude U.S. citizens from transferring their shares
of Common Stock to non-U.S. citizens. This may restrict the available market for
resales of shares of Common Stock and for the issuance of shares by the Company.
 
                            DESCRIPTION OF WARRANTS
 
     The Company may issue Warrants for the purchase of Common Stock. Warrants
may be issued independently or together with Debt Securities, Preferred Stock or
Common Stock offered by any Prospectus Supplement and may be attached to or
separate from any such offered Securities. Each series of Warrants will be
issued under a separate warrant agreement (a "Warrant Agreement") to be entered
into between the Company and a bank or trust company, as warrant agent (the
"Warrant Agent"), all as set forth in the Prospectus Supplement relating to the
particular issue of Warrants. The Warrant Agent will act solely as an agent of
the Company in connection with the Warrants and will not assume any obligation
or relationship of agency or trust for or with any holders of Warrants or
beneficial owners of Warrants. The following summary of certain provisions of
the Warrants does not purport to be complete and is subject to, and is qualified
in its entirety by reference to, all provisions of the Warrant Agreements.
 
     Reference is made to the Prospectus Supplement relating to the particular
issue of Warrants offered thereby for the terms of such Warrants, including,
where applicable: (i) the number of shares of Common
 
                                       21
<PAGE>   24
 
Stock purchasable upon the exercise of Warrants and the price at which such
number of shares of Common Stock may be purchased upon such exercise; (ii) the
date on which the right to exercise such Warrants shall commence and the date on
which such right shall expire (the "Expiration Date"); (iii) United States
Federal income tax consequences applicable to such Warrants; and (iv) any other
terms of such Warrants. Warrants will be offered and exercisable for U.S.
dollars only. Warrants will be issued in registered form only. The exercise
price for Warrants will be subject to adjustment in accordance with the
applicable Prospectus Supplement.
 
     Each Warrant will entitle the holder thereof to purchase such number of
shares of Common Stock at such exercise price as shall in each case be set forth
in, or calculable from, the Prospectus Supplement relating to the Warrants,
which exercise price may be subject to adjustment upon the occurrence of certain
events as set forth in such Prospectus Supplement. After the close of business
on the Expiration Date (or such later date to which such Expiration Date may be
extended by the Company), unexercised Warrants will become void. The place or
places where, and the manner in which, Warrants may be exercised shall be
specified in the Prospectus Supplement relating to such Warrants.
 
     Prior to the exercise of any Warrants, holders of such Warrants will not
have any of the rights of holders of Common Stock purchasable upon such
exercise, including the right to receive payments of dividends, if any, on the
Common Stock purchasable upon such exercise, or to exercise any applicable right
to vote.
 
                              PLAN OF DISTRIBUTION
 
GENERAL
 
     The Company may sell Securities to or through underwriters or dealers, and
also may sell Securities directly to one or more other purchasers or through
agents. The Prospectus Supplement will set forth the names of any underwriters
or agents involved in the sale of the Offered Securities and any applicable
commissions or discounts.
 
     Underwriters, dealers or agents may offer and sell the Offered Securities
at a fixed price or prices, which may be changed, or from time to time at market
prices prevailing at the time of sale, at prices related to such prevailing
market prices or at negotiated prices. In connection with the sale of the
Securities, underwriters or agents may be deemed to have received compensation
from the Company in the form of underwriting discounts or commissions and may
also receive commissions from purchasers of the Securities for whom they may act
as agent. Underwriters or agents may sell the Securities to or through dealers,
and such dealers may receive compensation in the form of discounts, concessions
or commissions from the underwriters or commissions from the purchasers for whom
they may act as agent.
 
     The Securities (other than the Common Stock), when first issued, will have
no established trading market. Any underwriters or agents to or through whom
Securities are sold by the Company for public offering and sale may make a
market in such Securities, but such underwriters or agents will not be obligated
to do so and may discontinue any market making at any time without notice. No
assurance can be given as to the liquidity of the trading market for any such
Securities.
 
     Any underwriters, dealers or agents participating in the distribution of
the Securities may be deemed to be underwriters, and any discounts and
commissions received by them and any profit realized by them on resale of the
Securities may be deemed to be underwriting discounts and commissions under the
Securities Act of 1933, as amended (the "1933 Act"). Underwriters, dealers or
agents may be entitled, under agreements entered into with the Company, to
indemnification against or contribution toward certain civil liabilities,
including liabilities under the 1933 Act.
 
                                       22
<PAGE>   25
 
                                 LEGAL MATTERS
 
     Unless otherwise specified in a Prospectus Supplement relating to
particular Securities, certain legal matters with respect to the validity of the
Securities will be passed upon for the Company by Vinson & Elkins L.L.P.,
Houston, Texas.
 
                                    EXPERTS
 
     The consolidated financial statements of the Company and its subsidiaries
as of December 31, 1997 and 1996, and for each of the years in the three-year
period ended December 31, 1997, have been incorporated by reference herein and
in the Registration Statement in reliance upon the report of KPMG Peat Marwick
LLP, independent certified public accountants, incorporated by reference herein,
and upon the authority of such firm as experts in accounting and auditing.
 
     With respect to the unaudited interim financial information for the periods
ended March 31, 1998 and 1997, incorporated by reference herein, the independent
certified public accountants have reported that they applied limited procedures
in accordance with professional standards for a review of such information.
However, their separate reports included in the Company's quarterly reports on
Form 10-Q for the quarter ended March 31, 1998, and incorporated by reference
herein, states that they did not audit and they do not express an opinion on
that interim financial information. Accordingly, the degree of reliance on their
reports on such information should be restricted in light of the limited nature
of the review procedures applied. The accountants are not subject to the
liability provisions of Section 11 of the Securities Act for their report on the
unaudited interim financial information because that report is not a "report" or
a "part" of the Registration Statement prepared or certified by the accountants
within the meaning of Sections 7 and 11 of the Securities Act.
 
                                       23
<PAGE>   26
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
     The following table sets forth the estimated expenses in connection with
the distribution of the securities covered by this Registration Statement. All
of the expenses will be borne by the Company except as otherwise indicated.
 
<TABLE>
<S>                                                           <C>
Registration fee under the Securities Act...................  $ 68,963
Printing and engraving expenses.............................    75,000
Legal and accounting fees...................................   150,000
Trustee, transfer agent and registrar fees..................   200,000
Miscellaneous...............................................    16,037
                                                              --------
          Total.............................................  $510,000
                                                              ========
</TABLE>
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
     Article 2.02-1 of the Texas Business Corporation Act provides that any
director or officer of a Texas corporation may be indemnified against judgments,
penalties, fines, settlements and reasonable expenses actually incurred by him
in connection with or in defending any action, suit or proceeding in which he is
a party by reason of his position. A director or officer may be indemnified only
if it is determined that the person (a) conducted himself in good faith; (b)
reasonably believed (i) in the case of conduct in his official capacity, that
his conduct was in the corporation's best interests; and (ii) in all other
cases, that his conduct was at least not opposed to the corporation's best
interests; and (c) in the case of any criminal proceeding, had no reasonable
cause to believe his conduct was unlawful. If a director or officer is wholly
successful, on the merits or otherwise, in connection with such a proceeding,
such indemnification is mandatory.
 
     The Company's Restated Articles of Incorporation contain provisions
eliminating or limiting liabilities of directors for breaches of their duty of
care. The Company's Bylaws provide for indemnification of officers and directors
of the Company and persons serving at the request of the Company in such
capacities for other business organizations against certain losses, costs,
liabilities and expenses incurred by reason of their positions with the Company
or such other business organizations. The Company also has policies insuring its
officers and directors against certain liabilities for actions taken in such
capacities, including liabilities under the Securities Act.
 
ITEM 16. EXHIBITS.
 
<TABLE>
<CAPTION>
      EXHIBIT NO.                                DESCRIPTION
      -----------                                -----------
<C>                      <S>
          1.1**          -- Form of Underwriting Agreement (Debt Securities)
          1.2**          -- Form of Underwriting Agreement (Common Stock, Preferred
                            Stock and/or Warrants)
          4.1            -- Restated Articles of Incorporation of Marine Drilling
                            Companies, Inc. (Incorporated by reference to Exhibit
                            28.17 to the Current Report on Form 8-K of the Registrant
                            dated October 30, 1992.)
          4.2            -- Amended and Restated Bylaws of Marine Drilling Companies,
                            Inc. (Incorporated by reference to Exhibit 28.18 to the
                            Current Report on Form 8-K of the Registrant dated
                            October 30, 1992.)
          4.3*           -- Form of Senior Indenture between the Company, the
                            Subsidiary Guarantors and Chase Bank of Texas, National
                            Association, as Trustee.
          4.4*           -- Form of Subordinated Indenture between the Company and
                            Chase Bank of Texas, National Association, as Trustee.
</TABLE>
 
                                      II-1
<PAGE>   27
                               INDEX TO EXHIBITS
 
<TABLE>
<C>                      <S>
          4.5**          -- Form of Debt Securities.
          4.6**          -- Form of Warrants
          4.7            -- Marine Drilling Companies, Inc. Shareholder Rights
                            Agreement, form of Statement of Resolution Establishing
                            Series of Shares of Junior Participating Preferred Stock,
                            form of Right Certificate and form of the Summary of
                            Rights (Incorporated by reference to Exhibits 1-5 to the
                            Current Report on Form 8-K of the Company dated November
                            15, 1996).
          4.8            -- Credit Agreement dated as of March 7, 1997 among Marine
                            Drilling Companies, Inc., Bankers Trust Company,
                            Christiania Bank og KreditKasse, New York Branch and
                            certain other banks including Exhibit A thereto
                            (Incorporated by reference to Exhibit 10.27 of the
                            Company's Annual Report on Form 10-K for the year ended
                            December 31, 1996).
          5.1*           -- Opinion of Vinson & Elkins L.L.P. as to the legality of
                            the securities being registered.
         12.1*           -- Computation of Ratio of Earnings to Fixed Charges.
         15.1*           -- Letter regarding unaudited interim financial information.
         23.1*           -- Consent of KPMG Peat Marwick LLP
         23.2*           -- Consent of Vinson & Elkins L.L.P. (see Exhibit 5.1).
         24.1*           -- Powers of attorney.
         25.1*           -- Form T-1 Statement of Eligibility of Chase Bank of Texas,
                            National Association, as Trustee under the Senior
                            Indenture.
         25.2*           -- Form T-1 Statement of Eligibility of Chase Bank of Texas,
                            National Association, as Trustee under the Subordinated
                            Indenture.
</TABLE>
 
- ---------------
 
  * Filed herewith.
 
 ** To be filed as an exhibit to a Current Report on Form 8-K and incorporated
herein by reference.
 
<PAGE>   28
 
          (2) That, for the purpose of determining any liability under the
     Securities Act of 1933, each such post-effective amendment shall be deemed
     to be a new registration statement relating to the securities offered
     therein, and the offering of such securities at that time shall be deemed
     to be the initial bona fide offering thereof.
 
          (3) To remove from registration by means of a post-effective amendment
     any of the securities being registered which remain unsold at the
     termination of the offering.
 
          (4) That, for purposes of determining any liability under the
     Securities Act of 1933, each filing of the Company's annual report pursuant
     to section 13(a) or section 15(d) of the Securities Exchange Act of 1934
     (and, where applicable, each filing of an employee benefit plan's annual
     report pursuant to Section 15(d) of the Securities Exchange Act of 1934)
     that is incorporated by reference in the registration statement shall be
     deemed to be a new registration statement relating to the securities
     offered therein, and the offering of such securities at that time shall be
     deemed to be the initial bona fide offering thereof.
 
          (5) That for purposes of determining any liability under the
     Securities Act of 1933, the information omitted from the form of prospectus
     filed as part of a registration statement in reliance upon Rule 430A and
     contained in a form of prospectus filed by the registrants pursuant to Rule
     424(b)(1) or (4) or 497(h) under the Securities Act of 1933 shall be deemed
     to be part of this registration statement as of the time it was declared
     effective.
 
          (6) That, for purpose of determining any liability under the
     Securities Act of 1933, each post-effective amendment that contains a form
     of prospectus shall be deemed to be a new registration statement relating
     to the securities offered therein, and the offering of such securities at
     that time shall be deemed to be the initial bona fide offering thereof.
 
     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
registrants pursuant to the provisions set forth in Item 15, or otherwise, the
registrants have been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the Act
and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by a registrant of expenses
incurred or paid by a director, officer or controlling person of the registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.
 
                                      II-3
<PAGE>   29
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act of 1933, Marine Drilling
Companies, Inc. certifies that it has reasonable grounds to believe that it
meets all of the requirements for filing on Form S-3 and has duly caused this
Registration Statement or amendment to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Sugar Land, State of
Texas, on June 9, 1998.
 
                                            MARINE DRILLING COMPANIES, INC.
 
                                            By:        /s/ JAN RASK
                                              ----------------------------------
                                                           Jan Rask
                                                          President
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities on June 9, 1998.
 
<TABLE>
<CAPTION>
                      SIGNATURE                                            TITLE
                      ---------                                            -----
<S>                                                    <C>
 
                    /s/ JAN RASK                                      President, Chief
- -----------------------------------------------------                Executive Officer
                      Jan Rask                                          and Director
                                                               (Principal Executive Officer)
 
                /s/ T. SCOTT O'KEEFE                             Senior Vice President and
- -----------------------------------------------------             Chief Financial Officer
                  T. Scott O'Keefe                             (Principal Financial Officer)
 
                 /s/ DALE W. WILHELM                           Vice President and Controller
- -----------------------------------------------------          (Principal Accounting Officer)
                   Dale W. Wilhelm
 
                ROBERT L. BARBANELL*                               Chairman of the Board
- -----------------------------------------------------                   and Director
                 Robert L. Barbanell
 
                  DAVID A.B. BROWN*                                       Director
- -----------------------------------------------------
                  David A.B. Brown
 
                   HOWARD I. BULL*                                        Director
- -----------------------------------------------------
                   Howard I. Bull
 
                    J.C. BURTON*                                          Director
- -----------------------------------------------------
                     J.C. Burton
 
                  DAVID B. ROBSON*                                        Director
- -----------------------------------------------------
                   David B. Robson
 
                  ROBERT C. THOMAS*                                       Director
- -----------------------------------------------------
                  Robert C. Thomas
 
              *By: /s/ T. SCOTT O'KEEFE
  ------------------------------------------------
                 (T. Scott O'Keefe)
                  Attorney-in-Fact
</TABLE>
 
                                      II-4
<PAGE>   30
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Houston, State of Texas, on the 9th day of June,
1998.
 
                                            MARINE DRILLING
                                            MANAGEMENT COMPANY
 
                                            By:     /s/ H. LARRY ADKINS
 
                                              ----------------------------------
                                                       H. Larry Adkins
                                                          President
 
     KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints H. Larry Adkins and T. Scott O'Keefe, and each of
them (with full power to each of them to act alone), his true and lawful
attorney-in-fact and agent, with full power of substitution and resubstitution,
for him and in his name, place and stead, in any and all capacities, to sign on
his behalf individually and in each capacity stated below any and all amendments
(including post-effective amendments) to this Registration Statement and any
additional registration statements relating thereto filed pursuant to Rule
462(b), and to file the same, with all exhibits thereto and other documents in
connection therewith, with the Securities and Exchange Commission, granting unto
said attorneys-in-fact and agents, and each of them, full power and authority to
do and perform each and every act and thing requisite and necessary to be done
in and about the premises, as fully to all intents and purposes as he might or
could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents and either of them, or their substitutes, may
lawfully do or cause to be done by virtue hereof.
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities indicated on June 9, 1998.
 
<TABLE>
<CAPTION>
                      SIGNATURE                                                     TITLE
                      ---------                                                     -----
<C>                                                         <S>
 
                 /s/ H. LARRY ADKINS                        President and Director (Principal Executive Officer)
- -----------------------------------------------------
                   H. Larry Adkins
 
                /s/ T. SCOTT O'KEEFE                        Senior Vice President and Director (Principal
- -----------------------------------------------------         Financial Officer)
                  T. Scott O'Keefe
 
                 /s/ DALE W. WILHELM                        Vice President (Principal Accounting Officer)
- -----------------------------------------------------
                   Dale W. Wilhelm
 
                /s/ VINCENT G. BOUNDS                       Senior Vice President and Director
- -----------------------------------------------------
                  Vincent G. Bounds
 
               /s/ DANNY R. RICHARDSON                      Senior Vice President and Director
- -----------------------------------------------------
                 Danny R. Richardson
</TABLE>
 
                                      II-5
<PAGE>   31
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Houston, State of Texas, on the 9th day of June,
1998.
 
                                            MARINE DRILLING
                                            INTERNATIONAL, INC.
 
                                            By:     /s/ H. LARRY ADKINS
 
                                              ----------------------------------
                                                       H. Larry Adkins
                                                          President
 
     KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints H. Larry Adkins and T. Scott O'Keefe, and each of
them (with full power to each of them to act alone), his true and lawful
attorney-in-fact and agent, with full power of substitution and resubstitution,
for him and in his name, place and stead, in any and all capacities, to sign on
his behalf individually and in each capacity stated below any and all amendments
(including post-effective amendments) to this Registration Statement and any
additional registration statements relating thereto filed pursuant to Rule
462(b), and to file the same, with all exhibits thereto and other documents in
connection therewith, with the Securities and Exchange Commission, granting unto
said attorneys-in-fact and agents, and each of them, full power and authority to
do and perform each and every act and thing requisite and necessary to be done
in and about the premises, as fully to all intents and purposes as he might or
could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents and either of them, or their substitutes, may
lawfully do or cause to be done by virtue hereof.
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities indicated on June 9, 1998.
 
<TABLE>
<CAPTION>
                      SIGNATURE                                                     TITLE
                      ---------                                                     -----
<C>                                                         <S>
 
                 /s/ H. LARRY ADKINS                        President and Director (Principal Executive Officer)
- -----------------------------------------------------
                   H. Larry Adkins
 
                /s/ T. SCOTT O'KEEFE                        Senior Vice President and Director (Principal
- -----------------------------------------------------         Financial Officer)
                  T. Scott O'Keefe
 
                 /s/ DALE W. WILHELM                        Vice President (Principal Accounting Officer)
- -----------------------------------------------------
                   Dale W. Wilhelm
 
                /s/ VINCENT G. BOUNDS                       Senior Vice President and Director
- -----------------------------------------------------
                  Vincent G. Bounds
 
               /s/ DANNY R. RICHARDSON                      Senior Vice President and Director
- -----------------------------------------------------
                 Danny R. Richardson
</TABLE>
 
                                      II-6
<PAGE>   32
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Houston, State of Texas, on the 9th day of June,
1998.
 
                                            MARINE 300 SERIES, INC.
 
                                            By:     /s/ H. LARRY ADKINS
 
                                              ----------------------------------
                                                       H. Larry Adkins
                                                          President
 
     KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints H. Larry Adkins and T. Scott O'Keefe, and each of
them (with full power to each of them to act alone), his true and lawful
attorney-in-fact and agent, with full power of substitution and resubstitution,
for him and in his name, place and stead, in any and all capacities, to sign on
his behalf individually and in each capacity stated below any and all amendments
(including post-effective amendments) to this Registration Statement and any
additional registration statements relating thereto filed pursuant to Rule
462(b), and to file the same, with all exhibits thereto and other documents in
connection therewith, with the Securities and Exchange Commission, granting unto
said attorneys-in-fact and agents, and each of them, full power and authority to
do and perform each and every act and thing requisite and necessary to be done
in and about the premises, as fully to all intents and purposes as he might or
could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents and either of them, or their substitutes, may
lawfully do or cause to be done by virtue hereof.
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities indicated on June 9, 1998.
 
<TABLE>
<CAPTION>
                      SIGNATURE                                                     TITLE
                      ---------                                                     -----
<C>                                                         <S>
 
                 /s/ H. LARRY ADKINS                        President and Director (Principal Executive Officer)
- -----------------------------------------------------
                   H. Larry Adkins
 
                /s/ T. SCOTT O'KEEFE                        Senior Vice President and Director (Principal
- -----------------------------------------------------         Financial Officer)
                  T. Scott O'Keefe
 
                 /s/ DALE W. WILHELM                        Vice President (Principal Accounting Officer)
- -----------------------------------------------------
                   Dale W. Wilhelm
 
                /s/ VINCENT G. BOUNDS                       Senior Vice President and Director
- -----------------------------------------------------
                  Vincent G. Bounds
 
               /s/ DANNY R. RICHARDSON                      Senior Vice President and Director
- -----------------------------------------------------
                 Danny R. Richardson
</TABLE>
 
                                      II-7
<PAGE>   33
 
                               INDEX TO EXHIBITS
 
<TABLE>
<CAPTION>
      EXHIBIT NO.                                DESCRIPTION
      -----------                                -----------
<C>                      <S>
          1.1**          -- Form of Underwriting Agreement (Debt Securities)
          1.2**          -- Form of Underwriting Agreement (Common Stock, Preferred
                            Stock and/or Warrants)
          4.1            -- Restated Articles of Incorporation of Marine Drilling
                            Companies, Inc. (Incorporated by reference to Exhibit
                            28.17 to the Current Report on Form 8-K of the Registrant
                            dated October 30, 1992.)
          4.2            -- Amended and Restated Bylaws of Marine Drilling Companies,
                            Inc. (Incorporated by reference to Exhibit 28.18 to the
                            Current Report on Form 8-K of the Registrant dated
                            October 30, 1992.)
          4.3*           -- Form of Senior Indenture between the Company, the
                            Subsidiary Guarantors and Chase Bank of Texas, National
                            Association, as Trustee.
          4.4*           -- Form of Subordinated Indenture between the Company and
                            Chase Bank of Texas, National Association, as Trustee.
          4.5**          -- Form of Debt Securities.
          4.6**          -- Form of Warrants
          4.7            -- Marine Drilling Companies, Inc. Shareholder Rights
                            Agreement, form of Statement of Resolution Establishing
                            Series of Shares of Junior Participating Preferred Stock,
                            form of Right Certificate and form of the Summary of
                            Rights (Incorporated by reference to Exhibits 1-5 to the
                            Current Report on Form 8-K of the Company dated November
                            15, 1996).
          4.8            -- Credit Agreement dated as of March 7, 1997 among Marine
                            Drilling Companies, Inc., Bankers Trust Company,
                            Christiania Bank og KreditKasse, New York Branch and
                            certain other banks including Exhibit A thereto
                            (Incorporated by reference to Exhibit 10.27 of the
                            Company's Annual Report on Form 10-K for the year ended
                            December 31, 1996).
          5.1*           -- Opinion of Vinson & Elkins L.L.P. as to the legality of
                            the securities being registered.
         12.1*           -- Computation of Ratio of Earnings to Fixed Charges.
         15.1*           -- Letter regarding unaudited interim financial information.
         23.1*           -- Consent of KPMG Peat Marwick LLP
         23.2*           -- Consent of Vinson & Elkins L.L.P. (see Exhibit 5.1).
         24.1*           -- Powers of attorney.
         25.1*           -- Form T-1 Statement of Eligibility of Chase Bank of Texas,
                            National Association, as Trustee under the Senior
                            Indenture.
         25.2*           -- Form T-1 Statement of Eligibility of Chase Bank of Texas,
                            National Association, as Trustee under the Subordinated
                            Indenture.
</TABLE>
 
- ---------------
 
  * Filed herewith.
 
 ** To be filed as an exhibit to a Current Report on Form 8-K and incorporated
herein by reference.

<PAGE>   1
                                                                     EXHIBIT 4.3

================================================================================



                        MARINE DRILLING COMPANIES, INC.

                                      AND

                             SUBSIDIARY GUARANTORS


                                       TO

                   CHASE BANK OF TEXAS, NATIONAL ASSOCIATION


                                    TRUSTEE

                      -----------------------------------

                                   INDENTURE



                          Dated as of __________, 1998


================================================================================
<PAGE>   2
                        MARINE DRILLING COMPANIES, INC.
         RECONCILIATION AND TIE BETWEEN TRUST INDENTURE ACT OF 1939 AND
                    INDENTURE DATED AS OF ___________, 1998


<TABLE>
<CAPTION>
Trust Indenture
  Act Section                                                                                    Indenture Section
- ---------------                                                                                  -----------------
<S>                                                                                                     <C>
Section 310(a)(1)     ..............................................................................    609
           (a)(2)     ..............................................................................    609
           (a)(3)     ..............................................................................    Not applicable
           (a)(4)     ..............................................................................    Not applicable
           (b)        ..............................................................................    608
                      ..............................................................................    610
Section 311(a)        ..............................................................................    613
           (b)        ..............................................................................    613
Section 312(a)        ..............................................................................    701
                      ..............................................................................    702
           (b)        ..............................................................................    702
           (c)        ..............................................................................    702
Section 313(a)        ..............................................................................    703
           (b)        ..............................................................................    703
           (c)        ..............................................................................    703
           (d)        ..............................................................................    703
Section 314(a)(1)-(3) ..............................................................................    704, 1006
           (a)(4)     ..............................................................................    101
                      ..............................................................................    1004
           (b)        ..............................................................................    Not applicable
           (c)(1)     ..............................................................................    102
           (c)(2)     ..............................................................................    102
           (c)(3)     ..............................................................................    Not Applicable
           (d)        ..............................................................................    Not Applicable
           (e)        ..............................................................................    102
Section 315(a)        ..............................................................................    601
           (b)        ..............................................................................    602
           (c)        ..............................................................................    601
           (d)        ..............................................................................    601
           (e)        ..............................................................................    514
Section 316(a)        ..............................................................................    101
           (a)(1)(A)  ..............................................................................    502
                      ..............................................................................    512
           (a)(1)(B)  ..............................................................................    513
           (a)(2)     ..............................................................................    Not applicable
           (b)        ..............................................................................    508
           (c)        ..............................................................................    104
Section 317(a)(1)     ..............................................................................    503
           (a)(2)     ..............................................................................    504
           (b)        ..............................................................................    1003
Section 318(a)        ..............................................................................    108
</TABLE>

- ---------------
NOTE:  This reconciliation and tie shall not, for any purpose, be deemed to be
       part of the Indenture.





                                      -a-
<PAGE>   3
                               TABLE OF CONTENTS


<TABLE>
<S>                                                                                                                    <C>
RECITALS OF THE COMPANY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

         ARTICLE ONE
         DEFINITIONS AND OTHER PROVISIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
                 SECTION 101.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
                 SECTION 102.  Compliance Certificates and Opinions . . . . . . . . . . . . . . . . . . . . . . . . . . 8
                 SECTION 103.  Form of Documents Delivered to Trustee.  . . . . . . . . . . . . . . . . . . . . . . . . 8
                 SECTION 104.  Acts of Holders. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
                 SECTION 105. Notice, Etc., to Trustee, Company and Subsidiary Guarantors.  . . . . . . . . . . . . .  10
                 SECTION 106.  Notice to Holders of Securities; Waiver. . . . . . . . . . . . . . . . . . . . . . . .  10
                 SECTION 107.  Language of Notices, Etc.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                 SECTION 108.  Conflict with Trust Indenture Act. . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                 SECTION 109.  Effect of Headings and Table of Contents . . . . . . . . . . . . . . . . . . . . . . .  12
                 SECTION 110.  Successors and Assigns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
                 SECTION 111.  Separability Clause  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
                 SECTION 112.  Benefits of Indenture  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
                 SECTION 113.  Governing Law  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
                 SECTION 114.  Legal Holidays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
                 SECTION 115.Partners, Incorporators, Stockholders, Officers and
                                           Directors of Issuer and the Trustee Exempt from
                                           Individual Liability . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
                 SECTION 116.  Counterparts.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13

         ARTICLE TWO
         SECURITY FORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
                 SECTION 201.  Forms Generally  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
                 SECTION 202.  Form of Trustee's Certificate of Authentication  . . . . . . . . . . . . . . . . . . .  14
                 SECTION 203.  Securities in Global Form  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                 SECTION 204.  Form of Legend for Book-Entry Securities . . . . . . . . . . . . . . . . . . . . . . .  15

         ARTICLE THREE
         THE SECURITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                 SECTION 301.  Amount Unlimited; Issuable in Series . . . . . . . . . . . . . . . . . . . . . . . . .  15
                 SECTION 302.  Denominations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
                 SECTION 303.  Execution, Authentication, Delivery and Dating . . . . . . . . . . . . . . . . . . . .  18
                 SECTION 304.  Temporary Securities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
                 SECTION 305.  Registration, Registration of Transfer and Exchange  . . . . . . . . . . . . . . . . .  22
                 SECTION 306.  Mutilated, Destroyed, Lost and Stolen Securities and
                                           Coupons  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  25
                 SECTION 307.  Payment of Interest; Interest Rights Preserved . . . . . . . . . . . . . . . . . . . .  26
                 SECTION 308.  Persons Deemed Owners  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
                 SECTION 309.  Cancellation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
                 SECTION 310.  Computation of Interest  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
</TABLE>





                                      -i-
<PAGE>   4
<TABLE>
<S>                                                                                                                    <C>
         ARTICLE FOUR
         SATISFACTION AND DISCHARGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
                 SECTION 401.  Satisfaction and Discharge of Indenture  . . . . . . . . . . . . . . . . . . . . . . .  29
                 SECTION 402.  Application of Trust Money . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30

         ARTICLE FIVE
         REMEDIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
                 SECTION 501.  Events of Default  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
                 SECTION 502.  Acceleration of Maturity; Rescission and Annulment . . . . . . . . . . . . . . . . . .  31
                 SECTION 503.  Collection of Indebtedness and Suits for Enforcement by
                                           Trustee  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
                 SECTION 504.  Trustee May File Proofs of Claim . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                 SECTION 505.  Trustee May Enforce Claims Without Possession of
                                           Securities or Coupons  . . . . . . . . . . . . . . . . . . . . . . . . . .  34
                 SECTION 506.  Application of Money Collected . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
                 SECTION 507.  Limitation on Suits  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  35
                 SECTION 508.  Unconditional Right of Holders to Receive Principal,
                                           Premium and Interest . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
                 SECTION 509.  Restoration of Rights and Remedies . . . . . . . . . . . . . . . . . . . . . . . . . .  36
                 SECTION 510.  Rights and Remedies Cumulative . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
                 SECTION 511.  Delay or Omission Not Waiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
                 SECTION 512.  Control by Holders of Securities . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
                 SECTION 513.  Waiver of Past Defaults  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  37
                 SECTION 514.  Undertaking for Costs  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  37
                 SECTION 515.  Waiver of Stay or Extension Laws . . . . . . . . . . . . . . . . . . . . . . . . . . .  37

         ARTICLE SIX
         THE TRUSTEE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  38
                 SECTION 601.  Certain Duties and Responsibilities  . . . . . . . . . . . . . . . . . . . . . . . . .  38
                 SECTION 602.  Notice of Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  38
                 SECTION 603.  Certain Rights of Trustee  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  38
                 SECTION 604.  Not Responsible for Recitals or Issuance of Securities . . . . . . . . . . . . . . . .  40
                 SECTION 605.  May Hold Securities  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40
                 SECTION 606.  Money Held in Trust  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40
                 SECTION 607.  Compensation and Reimbursement . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40
                 SECTION 608.  Disqualification; Conflicting Interests  . . . . . . . . . . . . . . . . . . . . . . .  41
                 SECTION 609.  Corporate Trustee Required; Eligibility  . . . . . . . . . . . . . . . . . . . . . . .  41
                 SECTION 610.  Resignation and Removal; Appointment of Successor  . . . . . . . . . . . . . . . . . .  41
                 SECTION 611.  Acceptance of Appointment by Successor . . . . . . . . . . . . . . . . . . . . . . . .  43
                 SECTION 612.  Merger, Conversion, Consolidation or Succession to
                                           Business . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  44
                 SECTION 613.  Preferential Collection of Claims Against Company  . . . . . . . . . . . . . . . . . .  44
                 SECTION 614.  Appointment of Authenticating Agent  . . . . . . . . . . . . . . . . . . . . . . . . .  44
</TABLE>





                                      -ii-
<PAGE>   5
<TABLE>
<S>                                                                                                                    <C>
         ARTICLE SEVEN
         HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
                 SECTION 701.  Company to Furnish Trustee Names and Addresses
                                           of Holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
                 SECTION 702.  Preservation of Information;  Communications to Holders  . . . . . . . . . . . . . . .  46
                 SECTION 703.  Reports by Trustee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
                 SECTION 704.  Reports by Company . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47

         ARTICLE EIGHT
         CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
                 SECTION 801.  Company May Consolidate, Etc., Only on Certain Terms . . . . . . . . . . . . . . . . .  47
                 SECTION 802.  Successor Substituted  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48

         ARTICLE NINE
         SUPPLEMENTAL INDENTURES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
                 SECTION 901.  Supplemental Indentures without Consent of Holders . . . . . . . . . . . . . . . . . .  48
                 SECTION 902.  Supplemental Indentures with Consent of Holders  . . . . . . . . . . . . . . . . . . .  50
                 SECTION 903.  Execution of Supplemental Indentures . . . . . . . . . . . . . . . . . . . . . . . . .  51
                 SECTION 904.  Effect of Supplemental Indentures  . . . . . . . . . . . . . . . . . . . . . . . . . .  51
                 SECTION 905.  Conformity with Trust Indenture Act  . . . . . . . . . . . . . . . . . . . . . . . . .  51
                 SECTION 906.  Reference in Securities to Supplemental Indentures . . . . . . . . . . . . . . . . . .  51

         ARTICLE TEN
         COVENANTS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  52
                 SECTION 1001.  Payment of Principal, Premium and Interest  . . . . . . . . . . . . . . . . . . . . .  52
                 SECTION 1002.  Maintenance of Office or Agency . . . . . . . . . . . . . . . . . . . . . . . . . . .  52
                 SECTION 1003.  Money for Securities Payments to Be Held in Trust . . . . . . . . . . . . . . . . . .  53
                 SECTION 1004.  Additional Amounts  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  54
                 SECTION 1005.  Purchase of Securities by Company or Subsidiary . . . . . . . . . . . . . . . . . . .  55
                 SECTION 1006.  Statement by Officer as to Default  . . . . . . . . . . . . . . . . . . . . . . . . .  55
                 SECTION 1007.  Waiver of Certain Covenants . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  55

         ARTICLE ELEVEN
         REDEMPTION OF SECURITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  56
                 SECTION 1101.  Applicability of Article  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  56
                 SECTION 1102.  Election to Redeem; Notice to Trustee . . . . . . . . . . . . . . . . . . . . . . . .  56
                 SECTION 1103.  Selection of Securities to Be Redeemed  . . . . . . . . . . . . . . . . . . . . . . .  56
                 SECTION 1104.  Notice of Redemption  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  57
                 SECTION 1105.  Deposit of Redemption Price . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  58
                 SECTION 1106.  Securities Payable on Redemption Date . . . . . . . . . . . . . . . . . . . . . . . .  58
                 SECTION 1107.  Securities Redeemed in Part . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  59

         ARTICLE TWELVE
         SINKING FUNDS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  59
                 SECTION 1201.  Applicability of Article  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  59
</TABLE>




                                     -iii-
<PAGE>   6
<TABLE>
<S>                                                                                                                    <C>
                 SECTION 1202.  Satisfaction of Sinking Fund Payments with Securities . . . . . . . . . . . . . . . .  59
                 SECTION 1203.  Redemption of Securities for Sinking Fund . . . . . . . . . . . . . . . . . . . . . .  60

         ARTICLE THIRTEEN
         DEFEASANCE AND COVENANT DEFEASANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  60
                 SECTION 1302.  Defeasance and Discharge  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  60
                 SECTION 1303.  Covenant Defeasance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  61
                 SECTION 1304.  Conditions to Defeasance or Covenant Defeasance . . . . . . . . . . . . . . . . . . .  61
                 SECTION 1305.  Deposited Money and U.S. Government Obligations to Be
                                           Held in Trust; Other Miscellaneous Provisions  . . . . . . . . . . . . . .  63
                 SECTION 1306.  Reinstatement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  63

         ARTICLE FOURTEEN
         MEETINGS OF HOLDERS OF SECURITIES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  64
                 SECTION 1401.  Purposes for Which Meetings May Be Called . . . . . . . . . . . . . . . . . . . . . .  64
                 SECTION 1402.  Call, Notice and Place of Meetings  . . . . . . . . . . . . . . . . . . . . . . . . .  64
                 SECTION 1403.  Persons Entitled to Vote at Meetings  . . . . . . . . . . . . . . . . . . . . . . . .  64
                 SECTION 1404.  Quorum; Action  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  64
                 SECTION 1405.  Determination of Voting Rights; Conduct and
                                           Adjournment of Meetings  . . . . . . . . . . . . . . . . . . . . . . . . .  65
                 SECTION 1406.  Counting Votes and Recording Action of Meetings . . . . . . . . . . . . . . . . . . .  66
</TABLE>





                                      -iv-
<PAGE>   7
         THIS INDENTURE, dated as of _________, 1998, is by, between and among
MARINE DRILLING COMPANIES, INC., a corporation duly organized and existing
under the laws of the State of Texas (herein called the "Company"), having its
principal office at One Sugar Creek Blvd., Suite 600, Sugar Land, Texas
77478-3556, the Subsidiary Guarantors (as defined herein) and CHASE BANK OF
TEXAS, NATIONAL ASSOCIATION, a national banking association organized under the
laws of the United States of America, as Trustee (herein called the "Trustee").

                            RECITALS OF THE COMPANY

         The Company has duly authorized the execution and delivery of this
Indenture to provide for the issuance from time to time of its unsecured
debentures, notes or other evidences of indebtedness (herein called the
"Securities"), to be issued in one or more series, on either a senior or a
senior subordinated basis and either with or without the benefit of Subsidiary
Guarantees (as defined herein), as in this Indenture provided.

         All things necessary to make this Indenture a valid agreement of the
Company, in accordance with its terms, have been done.

         NOW, THEREFORE, THIS INDENTURE WITNESSETH:

         For and in consideration of the premises and the purchase of the
Securities by the Holders thereof, it is mutually agreed, for the equal and
proportionate benefit of all Holders of the Securities or of a series thereof,
as follows:

                                  ARTICLE ONE
                        DEFINITIONS AND OTHER PROVISIONS
                             OF GENERAL APPLICATION

SECTION 101.  Definitions.

         For all purposes of this Indenture, except as otherwise expressly
provided herein or in the terms of any series of Securities established
hereunder, or unless the context otherwise requires:

                 (1)      the terms defined in this Article have the meanings
         assigned to them in this Article and include the plural as well as the
         singular;

                 (2)      the term "obligor" on the Securities of any series
         means the Company, any Subsidiary Guarantor with respect to such
         Securities and any successor obligor upon the Securities of such
         series, and all other terms used herein which are defined in the Trust
         Indenture Act, either directly or by reference therein, have the
         meanings assigned to them therein;

                 (3)      all accounting terms not otherwise defined herein
         have the meanings assigned to them in accordance with generally
         accepted accounting principles in the United States of America, and,
         except as otherwise herein expressly provided, the term "generally
         accepted accounting principles" with respect to any computation
         required or permitted hereunder shall mean such accounting principles
         as are generally accepted in the United States of America as of the
         date of such computation; and
<PAGE>   8
                 (4)      the words "herein", "hereof" and "hereunder" and
         other words of similar import refer to this Indenture as a whole and
         not to any particular Article, Section or other subdivision, and the
         words "date of this Indenture" and "date hereof" and other words of
         similar import refer to the effective date of the original execution
         and delivery of this Indenture, viz. ______________, 1998.

         "Act", when used with respect to any Holder of a Security, has the
meaning specified in Section 104.

         "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person.  For the purposes of this definition
"control," when used with respect to any specified Person, means the power to
direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

         "Authenticating Agent" means any Person authorized by the Trustee
pursuant to Section 614 to act on behalf of the Trustee to authenticate
Securities of one or more series.

         "Authorized Newspaper" means a newspaper, in the English language or
in an official language of the country of publication, customarily published on
each Business Day, whether or not published on Saturdays, Sundays or holidays,
and of general circulation in the place in connection with which the term is
used or in the financial community of such place.  Where successive
publications are required to be made in Authorized Newspapers, the successive
publications may be made in the same or in different newspapers in the same
city meeting the foregoing requirements and in each case on any Business Day.

         "Bearer Security" means any Security in the form established pursuant
to Section 201 which is payable to bearer, including, without limitation, a
Security in temporary or permanent global form.

         "Board of Directors" means either the board of directors of the
Company or any duly authorized committee of that board.

         "Board Resolution" means a copy of a resolution certified by the
Secretary or an Assistant Secretary of the Company to have been duly adopted by
the Board of Directors and to be in full force and effect on the date of such
certification, and delivered to the Trustee.

         "Book-Entry Security" means a Security bearing the legend specified in
Section 204, evidencing all or part of a series of Securities, issued to the
Depository for such series or its nominee, and registered in the name of such
Depository or nominee.  Book-Entry Securities shall not be deemed to be
Securities in global form for purposes of Sections 201 and 203 and Article
Three of this Indenture.

         "Business Day", when used with respect to any Place of Payment or any
other particular location referred to in this Indenture or in the Securities,
means each Monday, Tuesday, Wednesday,





                                      -2-
<PAGE>   9
Thursday and Friday which is not a day on which banking institutions in that
Place of Payment or other location are authorized or obligated by law or
executive order to close.

         "Certification Date" means with respect to Securities of any series
(i), if Bearer Securities of such series are not to be initially represented by
a temporary global Security, the date of delivery of the definitive Bearer
Security and (ii), if Bearer Securities of such series are initially
represented by a temporary global Security, the earlier of (A) the Exchange
Date with respect to Securities of such series and (B), if the first Interest
Payment Date with respect to Securities of such series is prior to such
Exchange Date, such Interest Payment Date.

         "Commission" means the Securities and Exchange Commission, as from
time to time constituted, created under the Securities Exchange Act of 1934,
or, if at any time after the execution of this instrument such Commission is
not existing and performing the duties now assigned to it under the Trust
Indenture Act, then the body performing such duties at such time.

         "Common Depositary" has the meaning specified in Section 304.

         "Company" means the Person named as the "Company" in the first
paragraph of this instrument until a successor Person shall have become such
pursuant to the applicable provisions of this Indenture, and thereafter
"Company" shall mean such successor Person.

         "Company Request" or "Company Order" means a written request or order
signed in the name of the Company by its Chairman of the Board, its President
or a Vice President, and by its Treasurer, an Assistant Treasurer, its
Controller, its Secretary or an Assistant Secretary, and delivered to the
Trustee.

         "Corporate Trust Office" means the office of the Trustee in Dallas,
Texas or Houston, Texas, at which at any particular time its corporate trust
business shall be administered, which, as of the date hereof, is as follows:
(a) for payment, registration, transfer, exchange and tender of the Securities:
Chase Bank of Texas, National Association, One Main Place, 1201 Main Street,
18th Floor, Dallas, Texas 75202, telephone:  (800) 275-2048, telecopy: (214)
672-5746; and (b) for all other communications relating to the Securities:
Chase Bank of Texas, National Association, 600 Travis Street, Suite 1150,
Houston, Texas 77002, Attention:  Global Trust Services - Marine Drilling
Companies, Inc., telephone: (713) 216-6686, telecopy: (713) 216-5476.

         The term "corporation" means a corporation, association, limited
liability company, joint-stock company or business trust.

         The term "coupon" means any interest coupon appertaining to a Bearer
Security.

         "Defaulted Interest" has the meaning specified in Section 307.

         "Depository" means, with respect to the Securities of any series
issuable or issued in whole or in part in the form of one or more Book-Entry
Securities, the clearing agency registered under the Securities Exchange Act of
1934, specified for that purpose as contemplated by Section 301.





                                      -3-
<PAGE>   10
         "Dollar" or "$" means a dollar or other equivalent unit in such coin
or currency of the United States of America as at the time shall be legal
tender for the payment of public and private debts.

         "Euro-clear" means the operator of the Euro-clear System.

         "Event of Default" has the meaning specified in Section 501.

         "Exchange Date" has the meaning specified in Section 304.

         "Holder", when used with respect to any Security, means in the case of
a Registered Security the Person in whose name the Security is registered in
the Security Register and in the case of a Bearer Security the bearer thereof
and, when used with respect to any coupon, means the bearer thereof.

         "Indenture" means this instrument as originally executed or as it may
from time to time be supplemented or amended by one or more indentures
supplemental hereto entered into pursuant to the applicable provisions hereof
and shall include the terms of particular series of Securities established as
contemplated by Section 301.

         The term "interest", when used with respect to an Original Issue
Discount Security which by its terms bears interest only after Maturity, means
interest payable after Maturity.

         "Interest Payment Date", when used with respect to any Security, means
the Stated Maturity of an installment of interest on such Security.

         "Maturity", when used with respect to any Security, means the date on
which the principal of such Security or an installment of principal becomes due
and payable as therein or herein provided, whether at the Stated Maturity or by
declaration of acceleration, call for redemption or otherwise.

         "Officers' Certificate" means a certificate complying with the
provisions of Section 102 signed by the Chairman of the Board, the President or
a Vice President, and by the Treasurer, an Assistant Treasurer, the Controller,
the Secretary or an Assistant Secretary, of the Company, and delivered to the
Trustee.

         "Opinion of Counsel" means a written opinion of counsel, who may be an
employee of or counsel for the Company.

         "Original Issue Discount Security" means any Security which is issued
at a price lower than the principal amount payable upon the Stated Maturity
thereof and which provides for an amount less than such principal amount
thereof to be due and payable upon redemption thereof or upon a declaration of
acceleration of the Maturity thereof pursuant to Section 502.

         "Outstanding", when used with respect to Securities, means, as of the
date of determination, all Securities theretofore authenticated and delivered
under this Indenture, except:





                                      -4-
<PAGE>   11
                 (i)      Securities theretofore canceled by the Trustee or
         delivered to the Trustee for cancellation;

                 (ii)     Securities for whose payment or redemption money in
         the necessary amount has been theretofore deposited with the Trustee
         or any Paying Agent (other than the Company) in trust or set aside and
         segregated in trust by the Company (if the Company shall act as its
         own Paying Agent) for the Holders of such Securities and any coupons
         appertaining thereto, provided that, if such Securities are to be
         redeemed, notice of such redemption has been duly given pursuant to
         this Indenture or provision therefor satisfactory to the Trustee has
         been made; and

                 (iii)    Securities which have been paid pursuant to Section
         306 or in exchange for or in lieu of which other Securities have been
         authenticated and delivered pursuant to this Indenture, other than any
         such Securities in respect of which there shall have been presented to
         the Trustee proof satisfactory to it that such Securities are held by
         a bona fide purchaser in whose hands such Securities are valid
         obligations of the Company;

provided, however, that in determining whether the Holders of the requisite
principal amount of the Outstanding Securities have given any request, demand,
authorization, direction, notice, consent or waiver hereunder or whether a
quorum is present at a meeting of Holders of Securities (i) the principal
amount of an Original Issue Discount Security that shall be deemed to be
Outstanding shall be the amount of the principal thereof that would be due and
payable as of the date of such determination upon acceleration of the Maturity
thereof pursuant to Section 502, (ii) the principal amount of a Security
denominated in a foreign currency or currencies, including composite
currencies, shall be the Dollar equivalent, determined on the date of original
issuance of such Security in the manner provided as contemplated by Section
301, of the principal amount (or, in the case of an Original Issue Discount
Security, the Dollar equivalent on the date of original issuance of such
Security of the amount determined as provided in (i) above) of such Security,
and (iii) Securities owned by the Company or any other obligor upon the
Securities or any Affiliate of the Company or of such other obligor shall be
disregarded and deemed not to be Outstanding, except that, in determining
whether the Trustee shall be protected in relying upon any such request,
demand, authorization, direction, notice, consent or waiver, or upon any such
determination as to the presence of a quorum, only Securities which the Trustee
knows to be so owned shall be so disregarded.  Securities so owned which have
been pledged in good faith may be regarded as Outstanding if the pledgee
establishes to the satisfaction of the Trustee the pledgee's right so to act
with respect to such Securities and that the pledgee is not the Company or any
other obligor upon the Securities or any Affiliate of the Company or of such
other obligor.

         "Paying Agent" means any Person authorized by the Company to pay the
principal of or any premium or interest on any Securities on behalf of the
Company.

         "Person" means any individual, corporation, partnership, joint
venture, trust, unincorporated organization or government or any agency or
political subdivision thereof.





                                      -5-
<PAGE>   12
         "Place of Payment", when used with respect to the Securities of any
series, means the place or places as specified in accordance with Section 301
where, subject to the provisions of Section 1002, the principal of and any
premium and interest on the Securities of that series are payable.

         "Predecessor Security" of any particular Security means every previous
Security evidencing all or a portion of the same debt as that evidenced by such
particular Security; and for the purposes of this definition, any Security
authenticated and delivered under Section 306 in exchange for or in lieu of a
mutilated, destroyed, lost or stolen Security or a Security to which a
mutilated, destroyed, lost or stolen coupon appertains shall be deemed to
evidence the same debt as the mutilated, destroyed, lost or stolen Security or
the Security to which the mutilated, destroyed, lost or stolen coupon
appertains, as the case may be.

         "Redemption Date", when used with respect to any Security to be
redeemed, means the date fixed for such redemption by or pursuant to this
Indenture.

         "Redemption Price", when used with respect to any Security to be
redeemed, means the price at which it is to be redeemed pursuant to this
Indenture.

         "Registered Security" means any Security in the form established
pursuant to Section 201 which is registered in the Security Register.

         "Regular Record Date" for the interest payable on any Interest Payment
Date on the Registered Securities of any series means the date specified for
that purpose as contemplated by Section 301.

         "Responsible Officer", when used with respect to the Trustee, shall
mean any officer in the corporate trust department (or any successor group) of
the Trustee, including any Vice President, any Trust Officer, or any other
officer of the Trustee customarily performing functions similar to those
performed by the persons who at the time shall be such officers, respectively,
or to whom any corporate trust matter is referred at the Corporate Trust Office
because of his or her knowledge of and familiarity with the particular subject.

         "Securities" has the meaning stated in the first recital of this
Indenture and more particularly means any Securities authenticated and
delivered under this Indenture.

         "Security Register" and "Security Registrar" have the respective
meanings specified in Section 305.

         "Special Record Date" for the payment of any Defaulted Interest on the
Registered Securities of any series means a date fixed by the Trustee pursuant
to Section 307.

         "Stated Maturity", when used with respect to any Security or any
installment of principal thereof or interest thereon, means the date specified
in such Security or a coupon representing such installment of interest as the
fixed date on which the principal of such Security or such installment of
principal or interest is due and payable.





                                      -6-
<PAGE>   13
         "Subsidiary" with respect to any Person, means (i) a corporation a
majority of whose capital stock with voting power normally entitled to vote in
the election of directors is at the time, directly or indirectly, owned by such
Person, by such Person and one or more Subsidiaries of such Person or by one or
more Subsidiaries of such Person, (ii) a partnership in which such Person or a
Subsidiary of such Person is, at the time, a general partner and owns alone or
together with one or more Subsidiaries of such Person a majority of the
partnership interests, or (iii) any other Person (other than a corporation) in
which such Person, one or more Subsidiaries of such Person, or such Person and
one or more Subsidiaries of such Person, directly or indirectly, at the date of
determination thereof has at least majority ownership interest.

         "Subsidiary Guarantee" means a full and unconditional guarantee by a
Subsidiary Guarantor of the obligations of the Company with respect to the
Securities of a series, which guarantee shall be on the basis, and subject to
the terms and conditions, as may be specified as contemplated by Section 301 in
connection with the issuance of the Securities of such series.

         "Subsidiary Guarantor" means each of (i) the Persons so identified on
the signature page of this Indenture or any indenture supplemental hereto who,
pursuant to the terms of any series of Securities, are to provide a Subsidiary
Guarantee with respect to that series of Securities, (ii) any other Person that
executes a Subsidiary Guarantee with respect to a series of Securities in
accordance with the provisions thereof and (iii) their respective successors
and assigns, to the extent specified in the Subsidiary Guarantees.

         "Trustee" means the Person named as the "Trustee" in the first
paragraph of this Indenture until a successor Trustee shall have become such
pursuant to the applicable provisions of this Indenture, and thereafter
"Trustee" shall mean or include each Person who is then a Trustee hereunder,
and if at any time there is more than one such Person, "Trustee" as used with
respect to the Securities of any series shall mean the Trustee with respect to
Securities of that series.

         "Trust Indenture Act" means the Trust Indenture Act of 1939 as in
force at the date as of which this Indenture was executed; provided, however,
that in the event the Trust Indenture Act of 1939 is amended after such date,
"Trust Indenture Act" means, to the extent required by any such amendment, the
Trust Indenture Act of 1939 as so amended.

         "United States" means the United States of America (including the
States and the District of Columbia), its territories, its possessions and
other areas subject to its jurisdiction.

         "United States Alien" means any Person who, for United States Federal
income tax purposes, is a foreign corporation, a non-resident alien individual,
a non-resident alien fiduciary of a foreign estate or trust, or a foreign
partnership one or more of the members of which is, for United States Federal
income tax purposes, a foreign corporation, a non-resident alien individual or
a non-resident alien fiduciary of a foreign estate or trust.

         "U.S. Government Obligations" has the meaning specified in Section
1304.





                                      -7-
<PAGE>   14
         "Vice President", when used with respect to the Company or the
Trustee, means any vice president, whether or not designated by a number or a
word or words added before or after the title "vice president".

SECTION 102.  Compliance Certificates and Opinions.

         Upon any application or request by the Company to the Trustee to take
any action under any provision of this Indenture, the Company shall furnish to
the Trustee such certificates and opinions as may be required under the Trust
Indenture Act.  Each such certificate or opinion shall be given in the form of
an Officers' Certificate, if to be given by an officer of the Company, or an
Opinion of Counsel, if to be given by counsel, and shall comply with the
requirements of the Trust Indenture Act and any other requirements set forth in
this Indenture.

SECTION 103.  Form of Documents Delivered to Trustee.

         In any case where several matters are required to be certified by, or
covered by an opinion of, any specified Person, it is not necessary that all
such matters be certified by, or covered by the opinion of, only one such
Person, or that they be so certified or covered by only one document, but one
such Person may certify or give an opinion with respect to some matters and one
or more other such Persons as to other matters, and any such Person may certify
or give an opinion as to such matters in one or several documents.

         Any certificate or opinion of an officer of the Company may be based,
insofar as it relates to legal matters, upon a certificate or opinion of, or
representations by, counsel, unless such officer knows, or in the exercise of
reasonable care should know, that the certificate or opinion or representations
with respect to the matters upon which his certificate or opinion is based are
erroneous.  Any such certificate or Opinion of Counsel may be based, insofar as
it relates to factual matters, upon a certificate or opinion of, or
representations by, an officer or officers of the Company stating that the
information with respect to such factual matters is in the possession of the
Company, unless such counsel knows, or in the exercise of reasonable care
should know, that the certificate or opinion or representations with respect to
such matters are erroneous.

         Where any Person is required to make, give or execute two or more
applications, requests, consents, certificates, statements, opinions or other
instruments under this Indenture, they may, but need not, be consolidated and
form one instrument.

SECTION 104.  Acts of Holders.

         (a)     Any request, demand, authorization, direction, notice,
consent, waiver or other action provided by this Indenture to be given or taken
by Holders may be embodied in and evidenced by one or more instruments of
substantially similar tenor signed by such Holders in person or by an agent
duly appointed in writing.  If Securities of a series are issuable as Bearer
Securities, any request, demand, authorization, direction, notice, consent,
waiver or other action provided by this Indenture to be given or taken by
Holders of such series may, alternatively, be embodied in and evidenced by the
record of Holders of Securities of such series voting in favor thereof, either
in





                                      -8-
<PAGE>   15
person or by proxies duly appointed in writing, at any meeting of Holders of
Securities of such series duly called and held in accordance with the
provisions of Article Fourteen, or a combination of such instruments and any
such record.  Except as herein otherwise expressly provided, such action shall
become effective when such instrument or instruments or record or both are
delivered to the Trustee and, where it is hereby expressly required, to the
Company.  Such instrument or instruments and any such record (and the action
embodied therein and evidenced thereby) are herein sometimes referred to as the
"Act" of the Holders signing such instrument or instruments and so voting at
any such meeting.  Proof of execution of any such instrument or of a writing
appointing any such agent or proxy or of the holding by any Person of a
Security, shall be sufficient for any purpose of this Indenture and (subject to
Section 601) conclusive in favor of the Trustee and the Company, if made in the
manner provided in this Section.  The record of any meeting of Holders of
Securities shall be proved in the manner provided in Section 1406.

         (b)     The fact and date of the execution by any Person of any such
instrument or writing may be proved by the affidavit of a witness of such
execution or by a certificate of a notary public or other officer authorized by
law to take acknowledgments of deeds, certifying that the individual signing
such instrument or writing acknowledged to him the execution thereof.  Where
such execution is by a signer acting in a capacity other than his individual
capacity, such certificate or affidavit shall also constitute sufficient proof
of his authority.  The fact and date of the execution of any such instrument or
writing, or the authority of the Person executing the same, may also be proved
in any other manner which the Trustee deems sufficient.

         (c)     The Company may, in the circumstances permitted by the Trust
Indenture Act, fix any day as the record date for the purpose of determining
the Holders of Registered Securities of any series entitled to give or take any
request, demand, authorization, direction, notice, consent, waiver or other
action, or to vote on any action, authorized or permitted to be given or taken
by Holders of Securities of such series.  If not set by the Company prior to
the first solicitation of a Holder of Securities of such series made by any
Person in respect of any such action, or, in the case of any such vote, prior
to such vote, the record date for any such action or vote shall be the 30th day
(or, if later, the date of the most recent list of Holders required to be
provided pursuant to Section 701) prior to such first solicitation or vote, as
the case may be.  With regard to any record date for action to be taken by the
Holders of one or more series of Securities, only the Holders of Securities of
such series on such date (or their duly designated proxies) shall be entitled
to give or take, or vote on, the relevant action.

         (d)     The principal amount and serial numbers of Registered
Securities held by any Person, and the date of holding the same, shall be
proved by the Security Register.

         (e)     The principal amount and serial numbers of Bearer Securities
held by any Person, and the date of holding the same, may be proved by the
production of such Bearer Securities or by a certificate executed, as
depositary, by any trust company, bank, banker or other depositary, wherever
situated, if such certificate shall be deemed by the Trustee to be
satisfactory, showing that at the date therein mentioned such Person had on
deposit with such depositary, or exhibited to it, the Bearer Securities therein
described; or such facts may be proved by the certificate or affidavit of the
Person holding such Bearer Securities, if such certificate or affidavit is
deemed by the Trustee to be





                                      -9-
<PAGE>   16
satisfactory.  The Trustee and the Company may assume that such ownership of
any Bearer Security continues until (1) another certificate or affidavit
bearing a later date issued in respect of the same Bearer Security is produced,
or (2) such Bearer Security is produced to the Trustee by some other Person, or
(3) such Bearer Security is surrendered in exchange for a Registered Security,
or (4) such Bearer Security is no longer Outstanding.  The principal amount and
serial numbers of Bearer Securities held by any Person, and the date of holding
the same, may also be proved in any other manner which the Trustee deems
sufficient.

         (f)     Any request, demand, authorization, direction, notice,
consent, waiver or other Act of the Holder of any Security shall bind every
future Holder of the same Security and the Holder of every Security issued upon
the registration of transfer thereof or in exchange therefor or in lieu thereof
in respect of anything done, omitted or suffered to be done by the Trustee or
the Company in reliance thereon, whether or not notation of such action is made
upon such Security.

         (g)     Without limiting the foregoing, a Holder entitled hereunder to
give or take any action hereunder with regard to any particular Security may do
so with regard to all or any part of the principal amount of such Security or
by one or more duly appointed agents each of which may do so pursuant to such
appointment with regard to all or any different part of such principal amount.

SECTION 105. Notice, Etc., to Trustee, Company and Subsidiary Guarantors.

         Any request, demand, authorization, direction, notice, consent, waiver
or Act of Holders or other document provided or permitted by this Indenture to
be made upon, given or furnished to, or filed with,

                 (1)      the Trustee by any Holder or by the Company or any
         Subsidiary Guarantor shall be sufficient for every purpose hereunder
         if made, given, furnished or filed in writing to or with and received
         by the Trustee at its Corporate Trust Office in Dallas, Texas or
         Houston, Texas, as applicable, or,

                 (2)      the Company or any Subsidiary Guarantor by the
         Trustee or by any Holder shall be sufficient for every purpose
         hereunder (unless otherwise herein expressly provided) if in writing
         and mailed, first-class postage prepaid, to the Company addressed to
         it at the address of its principal office specified in the first
         paragraph of this Indenture, to the attention of its Treasurer, or at
         any other address previously furnished in writing to the Trustee by
         the Company.

SECTION 106.  Notice to Holders of Securities; Waiver.

         Except as otherwise expressly provided herein, where this Indenture
provides for notice to Holders of Securities of any event,

                 (1)      such notice shall be sufficiently given to Holders of
         Registered Securities if in writing and mailed, first-class postage
         prepaid, to each Holder of a Registered Security affected by such
         event, at the address of such Holder as it appears in the Security
         Register,





                                      -10-
<PAGE>   17
         not later than the latest date, and not earlier than the earliest
         date, prescribed for the giving of such notice; and

                 (2)      such notice shall be sufficiently given to Holders of
         Bearer Securities if published in an Authorized Newspaper in The City
         of New York and in such other city or cities as may be specified in
         such Securities on a Business Day at least twice, the first such
         publication to be not earlier than the earliest date, and not later
         than the latest date, prescribed for the giving of such notice.

         In case by reason of the suspension of regular mail service or by
reason of any other cause it shall be impracticable to give such notice to
Holders of Registered Securities by mail, then such notification as shall be
made with the approval of the Trustee shall constitute sufficient notice to
such Holders for every purpose hereunder.  In any case where notice to Holders
of Registered Securities is given by mail, neither the failure to mail such
notice, nor any defect in any notice so mailed, to any particular Holder of a
Registered Security shall affect the sufficiency of such notice with respect to
other Holders of Registered Securities or the sufficiency of any notice to
Holders of Bearer Securities given as provided herein.

         In case by the reason of the suspension of publication of any
Authorized Newspaper or Authorized Newspapers or by reason of any other cause
it shall be impracticable to publish any notice to Holders of Bearer Securities
as provided above, then such notification to Holders of Bearer Securities as
shall be given with the approval of the Trustee shall constitute sufficient
notice to such Holders for every purpose hereunder.  Neither the failure to
give notice by publication to Holders of Bearer Securities as provided above,
nor any defect in any notice so published, shall affect the sufficiency of any
notice to Holders of Registered Securities given as provided herein.

         Where this Indenture provides for notice in any manner, such notice
may be waived in writing by the Person entitled to receive such notice, either
before or after the event, and such waiver shall be the equivalent of such
notice.  Waivers of notice by Holders of Securities shall be filed with the
Trustee, but such filing shall not be a condition precedent to the validity of
any action taken in reliance upon such waiver.

SECTION 107.  Language of Notices, Etc.

         Any request, demand, authorization, direction, notice, consent or
waiver required or permitted under this Indenture shall be in the English
language, except that any published notice may be in an official language of
the country of publication.

SECTION 108.  Conflict with Trust Indenture Act.

         If any provision hereof limits, qualifies or conflicts with a
provision of the Trust Indenture Act that is required under such Act to be a
part of and govern this Indenture, the latter provision shall control.  If any
provision of this Indenture modifies or excludes any provision of the Trust
Indenture Act that may be so modified or excluded, the latter provision shall
be deemed to apply to this Indenture as so modified or to be excluded, as the
case may be.





                                      -11-
<PAGE>   18
SECTION 109.  Effect of Headings and Table of Contents.

         The Article and Section headings herein and the Table of Contents are
for convenience only and shall not affect the construction hereof.

SECTION 110.  Successors and Assigns.

         All covenants and agreements in this Indenture by the Company or any
Subsidiary Guarantor shall bind its successors and assigns, whether so
expressed or not.

SECTION 111.  Separability Clause.

         In case any provision in this Indenture or the Securities or coupons
shall be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or
impaired thereby.

SECTION 112.  Benefits of Indenture.

         Nothing in this Indenture or the Securities or coupons, express or
implied, shall give to any Person, other than the parties hereto, their
successors hereunder, the Holders of Securities and coupons and, if the
Securities are subject to any subordination provisions, the holders of any
indebtedness ranking senior to the Securities, any benefit or any legal or
equitable right, remedy or claim under this Indenture.

SECTION 113.  Governing Law.

         This Indenture, any Subsidiary Guarantees and the Securities and
coupons shall be governed by and construed in accordance with the laws of the
State of New York.

SECTION 114.  Legal Holidays.

         In any case where any Interest Payment Date, Redemption Date or Stated
Maturity of any Security shall not be a Business Day at any Place of Payment,
then (notwithstanding any other provision of this Indenture or of the
Securities or coupons other than a provision in the Securities of any series
which specifically states that such provision shall apply in lieu of this
Section) payment of interest or principal (and premium, if any) need not be
made at such Place of Payment on such date, but may be made on the next
succeeding Business Day at such Place of Payment with the same force and effect
as if made on the Interest Payment Date or Redemption Date, or at the Stated
Maturity, provided that no interest shall accrue on the amount so payable for
the period from and after such Interest Payment Date, Redemption Date or Stated
Maturity, as the case may be.





                                      -12-
<PAGE>   19
SECTION 115.     Partners, Incorporators, Stockholders, Officers and Directors
                 of Issuer and the Trustee Exempt from Individual Liability.

         No recourse under or upon any obligation, covenant or agreement
contained in this Indenture, or in any Security, or because of any indebtedness
evidenced thereby, shall be had against any incorporator, as such or against
any past, present or future stockholder, officer or director, as such, of the
Issuer or the Trustee, or any partner of the Issuer or the Trustee, or of any
successor, either directly or through the Issuer or the Trustee, or any
successor, under any rule of law, statute or constitutional provision or by the
enforcement of any assessment or by any legal or equitable proceeding or
otherwise, all such liability being expressly waived and released by the
acceptance of the Securities by the Holders thereof and as part of the
consideration for the issue of the Securities.

SECTION 116.  Counterparts.

         This Indenture may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.

                                  ARTICLE TWO
                                 SECURITY FORMS

SECTION 201.  Forms Generally.

         The Registered Securities, if any, of each series and the Bearer
Securities, if any, of each series and related coupons and notations of any
Subsidiary Guarantees shall be in substantially the form (including temporary
or permanent global form) as shall be established by or pursuant to a Board
Resolution or in one or more indentures supplemental hereto, in each case with
such appropriate insertions, omissions, substitutions and other variations as
are required or permitted by this Indenture, and may have such letters, numbers
or other marks of identification and such legends or endorsements placed
thereon as may be required to comply with law, or with the rules of any
securities exchange or to conform to general usage, all as may, consistently
herewith, be determined by the officers executing such Securities or coupons,
as evidenced by their execution of the Securities or coupons.  If temporary
Securities of any series are issued in global form as permitted by Section 304,
the form thereof shall be established as provided in the preceding sentence.  A
copy of the Board Resolution establishing the forms of Securities or coupons of
any series (or any such temporary global Security) shall be certified by the
Secretary or an Assistant Secretary of the Company and delivered to the Trustee
at or prior to the delivery of the Company Order contemplated by Section 303
for the authentication and delivery of such Securities (or any such temporary
global Security) or coupons.

         Unless otherwise specified as contemplated by Section 301, Securities
in bearer form shall have interest coupons attached.





                                      -13-
<PAGE>   20
         The definitive Securities and coupons, if any, shall be printed,
lithographed or engraved on steel engraved borders or may be produced in any
other manner, all as determined by the officers executing such Securities, as
evidenced by their execution of such Securities or coupons.

SECTION 202.  Form of Trustee's Certificate of Authentication.

         The Trustee's certificate of authentication shall be in substantially
the following form:

         "This is one of the Securities of the series designated therein
referred to in the within-mentioned Indenture.


                                    Chase Bank of Texas, National Association
                                            as Trustee


                                    By:                                    
                                       ---------------------------------
                                            Authorized Signatory."



SECTION 203.  Securities in Global Form.

         If Securities of a series are issuable in global form, as specified as
contemplated by Section 301, then, notwithstanding clause (10) of Section 301
and the provisions of Section 302, any such Security shall represent such of
the Outstanding Securities of such series as shall be specified therein and may
provide that it shall represent the aggregate amount of Outstanding Securities
from time to time endorsed thereon and that the aggregate amount of Outstanding
Securities represented thereby may be reduced to reflect exchanges.  Any
endorsement of a Security in global form to reflect the amount, or any increase
or decrease in the amount, of Outstanding Securities represented thereby shall
be made by the Trustee in such manner and upon instructions given by such
Person or Persons as shall be specified therein or in the Company Order to be
delivered to the Trustee pursuant to Section 303 or Section 304.  Subject to
the provisions of Section 303 and, if applicable, Section 304, the Trustee
shall deliver and redeliver any Security in permanent global form in the manner
and upon instructions given by the Person or Persons specified therein or in
the applicable Company Order.  If a Company Order pursuant to Section 303 or
304 has been, or simultaneously is, delivered, any instructions by the Company
with respect to endorsement or delivery or redelivery of a Security in global
form shall be in writing but need not comply with Section 102 and need not be
accompanied by an Opinion of Counsel.

         The provisions of the last sentence of Section 303 shall apply to any
Security represented by a Security in global form if such Security was never
issued and sold by the Company and the Company delivers to the Trustee the
Security in global form together with written instructions (which need not
comply with Section 102 and need not be accompanied by an Opinion of Counsel)
with regard to the reduction in the principal amount of Securities represented
thereby, together with the written statement contemplated by the last sentence
of Section 303.





                                      -14-
<PAGE>   21
         Notwithstanding the provisions of Sections 201 and 307, unless
otherwise specified as contemplated by Section 301, payment of principal of and
any premium and interest on any Security in permanent global form shall be made
to the Person or Persons specified therein.

SECTION 204.  Form of Legend for Book-Entry Securities.

         Any Book-Entry Security authenticated and delivered hereunder shall
bear a legend in substantially the following form:

         "This Security is a Book-Entry Security within the meaning of the
Indenture hereinafter referred to and is registered in the name of a Depository
or a nominee of a Depository.  This Security is exchangeable for Securities
registered in the name of a Person other than the Depository or its nominee
only in the limited circumstances described in the Indenture, and no transfer
of this Security (other than a transfer of this Security as a whole by the
Depository to a nominee of the Depository or by a nominee of the Depository to
the Depository or another nominee of the Depository) may be registered except
in such limited circumstances."

                                 ARTICLE THREE
                                 THE SECURITIES

SECTION 301.  Amount Unlimited; Issuable in Series.

         The aggregate principal amount of Securities which may be
authenticated and delivered under this Indenture is unlimited.

         The Securities may be issued in one or more series, and each such
series shall rank equally and pari passu with each other series as to right of
payment of principal and any premium and interest thereon.  There shall be
established in or pursuant to a Board Resolution and, subject to Section 303,
set forth, or determined in the manner provided, in an Officers' Certificate,
or established in one or more indentures supplemental hereto, prior to the
issuance of Securities of any series:

                 (1)      the title of the Securities of the series (which
         shall distinguish the Securities of the series from all other
         Securities);

                 (2)      any limit upon the aggregate principal amount of the
         Securities of the series which may be authenticated and delivered
         under this Indenture (except for Securities authenticated and
         delivered upon registration of transfer of, or in exchange for, or in
         lieu of, other Securities of the series pursuant to Section 304, 305,
         306, 906 or 1107 and except for any Securities which, pursuant to
         Section 303, are deemed never to have been authenticated and delivered
         hereunder);

                 (3)      whether Securities of the series are to be issuable
         as Registered Securities, Bearer Securities or both, whether any
         Securities of the series are to be issuable initially in temporary
         global form and whether any Securities of the series are to be
         issuable in





                                      -15-
<PAGE>   22
         permanent global form with or without coupons and, if so, whether
         beneficial owners of interests in any such permanent global Security
         may exchange such interests for Securities of such series and of like
         tenor of any authorized form and denomination and the circumstances
         under which any such exchanges may occur, if other than in the manner
         provided in Section 305;

                 (4)      the Person to whom any interest on any Registered
         Security of the series shall be payable, if other than the Person in
         whose name that Security (or one or more Predecessor Securities) is
         registered at the close of business on the Regular Record Date for
         such interest, the manner in which, or the Person to whom, any
         interest on any Bearer Security of the series shall be payable, if
         otherwise than upon presentation and surrender of the coupons
         appertaining thereto as they severally mature and the extent to which,
         or the manner in which, any interest payable on a temporary global
         Security on an Interest Payment Date will be paid if other than in the
         manner provided in Section 304;

                 (5)      the date or dates on which the principal of the
         Securities of the series is payable;

                 (6)      the rate or rates at which the Securities of the
         series shall bear interest, if any, or the method by which such rate
         or rates shall be determined, the date or dates from which any such
         interest shall accrue, the Interest Payment Dates on which any such
         interest shall be payable, and the Regular Record Date for any
         interest payable on any Registered Securities on any Interest Payment
         Date and whether, and under what circumstances, additional amounts
         with respect to such Securities shall be payable as set forth in
         Section 1004;

                 (7)      the place or places where, subject to the provisions
         of Section 1002, the principal of and any premium and interest on
         Securities of the series shall be payable, any Registered Securities
         of the series may be surrendered for registration of transfer,
         Securities of the series may be surrendered for exchange and notices
         and demands to or upon the Company in respect of the Securities of the
         series and this Indenture may be served;

                 (8)      the right, if any, of the Company to redeem
         Securities of the series, in whole or in part, at its option and the
         period or periods within which, the price or prices at which and the
         terms and conditions upon which Securities of the series may be so
         redeemed;

                 (9)      the obligation, if any, of the Company to redeem,
         purchase, or repay Securities of the series pursuant to any mandatory
         redemption, sinking fund or analogous provisions or at the option of a
         Holder thereof and the period or periods within which, the price or
         prices at which and the terms and conditions upon which Securities of
         the series shall be redeemed, purchased or repaid, in whole or in
         part, pursuant to such obligation;

                 (10)     the denominations in which any Registered Securities
         of the series shall be issuable, if other than denominations of $1,000
         and any integral multiple thereof, and the





                                      -16-
<PAGE>   23
         denomination or denominations in which any Bearer Securities of the
         series shall be issuable, if other than the denomination of $5,000;

                 (11)     the currency or currencies, including composite
         currencies, in which payment of the principal of and any premium and
         interest on any Securities of the series shall be payable if other
         than the currency of the United States of America and the manner of
         determining the equivalent thereof in the currency of the United
         States of America for purposes of the definition of "Outstanding" in
         Section 101;

                 (12)     if the amount of payments of principal of and any
         premium or interest on any Securities of the series may be determined
         with reference to an index, the manner in which such amounts shall be
         determined;

                 (13)     if other than the principal amount thereof, the
         portion of the principal amount of any Securities of the series which
         shall be payable upon declaration of acceleration of the Maturity
         thereof pursuant to Section 502;

                 (14)     if the principal of and any premium or interest on
         the Securities of the series are to be payable, at the election of the
         Company or a Holder thereof, in a currency or currencies, including
         composite currencies, other than that or those in which the Securities
         are stated to be payable, the currency or currencies in which payment
         of the principal of and any premium and interest on Securities of such
         series as to which such election is made shall be payable, and the
         periods within which and the terms and conditions upon which such
         election is to be made;

                 (15)     whether the Securities of the series shall be issued
         upon original issuance in whole or in part in the form of one or more
         Book-Entry Securities and, in such case, (a) the Depository with
         respect to such Book-Entry Security or Securities; and (b) the
         circumstances under which any such Book-Entry Security may be
         exchanged for Securities registered in the name of, and any transfer
         of such Book-Entry Security may be registered to, a Person other than
         such Depository or its nominee, if other than as set forth in Section
         305;

                 (16)     if either or both of the provisions of Section 1302
         or 1303 are applicable to the Securities of such series and any
         additional means of discharge pursuant to Section 1302 or 1303 and any
         additional conditions to the provisions of Section 1302 or 1303;

                 (17)     any deletions from, modifications of or additions to
         any Events of Default or covenants with respect to the Securities of
         such series;

                 (18)     whether the Securities of the initial series shall be
         issued upon a senior subordinated basis and, if so, the subordination
         provisions applicable to such series (and  any related Subsidiary
         Guarantees) and to any other series that may be issued thereafter;





                                      -17-
<PAGE>   24
                 (19)     whether the Securities of the series shall be
         guaranteed by one or more Subsidiary Guarantors and, if so, the terms
         of the Subsidiary Guarantees, including the circumstances in which
         such Subsidiary Guarantees may be released; and

                 (20)     any other terms of the series (which terms shall not
         be inconsistent with the provisions of this Indenture except as
         permitted by Section 901(5)).

         All Securities of any one series and the coupons appertaining to any
Bearer Securities of such series shall be substantially identical except, in
the case of Registered Securities, as to denomination and except as may
otherwise be provided in or pursuant to the Board Resolution referred to above
and (subject to Section 303) set forth, or determined in the manner provided,
in the Officers' Certificate referred to above or in any such indenture
supplemental hereto.

         If any of the terms of the series are established by action taken
pursuant to a Board Resolution, a copy of an appropriate record of such action
shall be certified by the Secretary or an Assistant Secretary of the Company
and delivered to the Trustee at or prior to the delivery of the Officers'
Certificate setting forth the terms of the series.

SECTION 302.  Denominations.

         Unless otherwise provided as contemplated by Section 301 with respect
to any series of Securities, any Registered Securities of a series shall be
issuable in denominations of $1,000 and any integral multiple thereof and any
Bearer Securities of a series shall be issuable in the denomination of $5,000.

SECTION 303.  Execution, Authentication, Delivery and Dating.

         The Securities shall be executed on behalf of the Company by its
Chairman of the Board, its President, its Treasurer, its Controller or its
Chief Financial Officer, under its corporate seal reproduced thereon attested
by its Secretary or one of its Assistant Secretaries.  The signature of any of
these officers on the Securities may be manual or facsimile.  Coupons shall
bear the facsimile signature of the Treasurer or any Assistant Treasurer of the
Company.

         Securities and coupons bearing the manual or facsimile signatures of
individuals who were at any time the proper officers of the Company shall bind
the Company, notwithstanding that such individuals or any of them have ceased
to hold such offices prior to the authentication and delivery of such
Securities or did not hold such offices at the date of such Securities.

         At any time and from time to time after the execution and delivery of
this Indenture, the Company may deliver Securities of any series, together with
any coupons appertaining thereto, executed by the Company to the Trustee for
authentication, together with a Company Order for the authentication and
delivery of such Securities, and the Trustee in accordance with the Company
Order shall authenticate and deliver such Securities; provided, however, that,
unless otherwise provided with respect to such series, in connection with its
original issuance, no Bearer Security shall be mailed or otherwise delivered to
any location in the United States; and provided, further, that,





                                      -18-
<PAGE>   25
unless otherwise provided with respect to such series, a Bearer Security may be
delivered in connection with its original issuance only if the Person entitled
to receive such Bearer Security shall have furnished a certificate in the form
set forth in Exhibit A to this Indenture, dated no earlier than the
Certification Date.  If any Security shall be represented by a permanent global
Bearer Security, then, for purposes of this Section and Section 304, the
notation of a beneficial owner's interest therein upon original issuance of such
Security or upon exchange of a portion of a temporary global Security shall be
deemed to be delivery in connection with its original issuance of such
beneficial owner's interest in such permanent global Security.  Except as
permitted by Section 306, the Trustee shall not authenticate and deliver any
Bearer Security unless all appurtenant coupons for interest then matured have
been detached and canceled.

         In authenticating Securities, the Trustee shall be entitled to
receive, and (subject to Section 601) shall be fully protected in relying upon,
an Opinion of Counsel stating:

                 (a)      that the forms of such Securities and coupons
         established by or pursuant to a Board Resolution as contemplated by
         Section 201 have been established in conformity with the provisions of
         this Indenture;

                 (b)      if the terms of such Securities and any coupons have
         been established by or pursuant to a Board Resolution as permitted by
         Section 301, that such terms have been established in conformity with
         the provisions of this Indenture; and

                 (c)      that such Securities, together with any coupons
         appertaining thereto, when authenticated and delivered by the Trustee
         and issued by the Company in the manner and subject to any conditions
         specified in such Opinion of Counsel, will constitute valid and
         legally binding obligations of the Company enforceable in accordance
         with their terms, subject to bankruptcy, insolvency, fraudulent
         transfer, reorganization and other laws of general applicability
         relating to or affecting creditors' rights and to general equity
         principles.

Such Opinion of Counsel shall also cover such other matters as the Trustee may
reasonably request.

         The Trustee shall not be required to authenticate such Securities the
forms or terms of which have been established by or pursuant to a Board
Resolution if the issue of such Securities pursuant to this Indenture will
affect the Trustee's own rights, duties or immunities under the Securities and
this Indenture or otherwise in a manner which is not reasonably acceptable to
the Trustee.

         Notwithstanding the provisions of Section 301 and of the two preceding
paragraphs, if all Securities of a series are not to be originally issued at
one time, it shall not be necessary to deliver the Officers' Certificate
otherwise required pursuant to Section 301 or the Company Order and Opinion of
Counsel otherwise required pursuant to such preceding paragraphs at or prior to
the time of authentication of each Security of such series if such documents
are delivered at or prior to the authentication upon issuance of the first
Security of such series to be issued.

         After the original issuance of the first Security of such series to be
issued, any separate request by the Company that the Trustee authenticate
Securities of such series for original issuance





                                      -19-
<PAGE>   26
will be deemed to be a certification by the Company (which, subject to Section
601, the Trustee shall be fully protected in relying on) that it is in
compliance with all conditions precedent provided for in this Indenture
relating to the authentication and delivery of such Securities.

         Each Registered Security shall be dated the date of its
authentication; and each Bearer Security shall be dated as of the date of
original issuance of the first Security of such series to be issued.

         No Security or coupon shall be entitled to any benefit under this
Indenture or be valid or obligatory for any purpose unless there appears on
such Security, or the Security to which such coupon appertains, a certificate
of authentication substantially in the form provided for herein executed by the
Trustee by manual signature, and such certificate upon any Security shall be
conclusive evidence, and the only evidence, that such Security has been duly
authenticated and delivered hereunder.  Notwithstanding the foregoing, if any
Security shall have been authenticated and delivered hereunder but never issued
and sold by the Company, and the Company shall deliver such Security to the
Trustee for cancellation as provided in Section 309 together with a written
statement (which need not comply with Section 102 and need not be accompanied
by an Opinion of Counsel) stating that such Security has never been issued and
sold by the Company, for all purposes of this Indenture such Security shall be
deemed never to have been authenticated and delivered hereunder and shall never
be entitled to the benefits of this Indenture.

SECTION 304.  Temporary Securities.

         Pending the preparation of definitive Securities of any series, the
Company may execute, and upon Company Order the Trustee shall authenticate and
deliver, temporary Securities which are printed, lithographed, typewritten or
otherwise produced, in any authorized denomination, substantially of the tenor
of the definitive Securities in lieu of which they are issued, in registered
form or, if authorized, in bearer form with one or more coupons or without
coupons, and with such appropriate insertions, omissions, substitutions and
other variations as the officers executing such Securities may determine, as
evidenced by their execution of such Securities.  In the case of any series
issuable as Bearer Securities, such temporary Securities may be in global form.
A temporary Bearer Security shall be delivered only in compliance with the
conditions set forth in Section 303.

         Except in the case of temporary Securities in global form (which shall
be exchanged in accordance with the provisions of the following paragraphs), if
temporary Securities of any series are issued, the Company will cause
definitive Securities of that series to be prepared without unreasonable delay.
After the preparation of definitive Securities of such series, the temporary
Securities of such series shall be exchangeable for definitive Securities of
such series upon surrender of the temporary Securities of such series at the
office or agency of the Company maintained pursuant to Section 1002 in a Place
of Payment for such series for the purpose of exchanges of Securities of such
series without charge to the Holder.  Upon surrender for cancellation of any
one or more temporary Securities of any series (accompanied by any unmatured
coupons appertaining thereto) the Company shall execute and the Trustee shall
authenticate and deliver in exchange therefor a like aggregate principal amount
of definitive Securities of the same series and of like tenor





                                      -20-
<PAGE>   27
of authorized denominations; provided, however, that no definitive Bearer
Security shall be issued in exchange for a temporary Registered Security.

         If temporary Securities of any series are issued in global form, any
such temporary global Security shall, unless otherwise provided therein, be
delivered to the London office of a depositary or common depositary (the
"Common Depositary"), for the benefit of Euro-clear and CEDEL S.A., for credit
to the respective accounts of the beneficial owners of such Securities (or to
such other accounts as they may direct).

         Without unnecessary delay but in any event not later than the date
specified in, or determined pursuant to the terms of, any such temporary global
Security of a series (the "Exchange Date"), the Company shall deliver to the
Trustee definitive Securities of that series in aggregate principal amount
equal to the principal amount of such temporary global Security, executed by
the Company.  On or after the Exchange Date such temporary global Security
shall be surrendered by the Common Depositary to the Trustee, as the Company's
agent for such purpose, to be exchanged, in whole or from time to time in part,
for definitive Securities of that series without charge and the Trustee shall
authenticate and deliver, in exchange for each portion of such temporary global
Security, a like aggregate principal amount of definitive Securities of the
same series of authorized denominations and of like tenor as the portion of
such temporary global Security to be exchanged; provided, however, that, unless
otherwise specified in such temporary global Security, upon such presentation
by the Common Depositary, such temporary global Security is accompanied by a
certificate dated the Exchange Date or a subsequent date and signed by
Euro-clear as to the portion of such temporary global Security held for its
account then to be exchanged and a certificate dated the Exchange Date or a
subsequent date and signed by CEDEL S.A. as to the portion of such temporary
global Security held for its account then to be exchanged, each in the form set
forth in Exhibit B to this Indenture.  The definitive Securities to be
delivered in exchange for any such temporary global Security shall be in bearer
form, registered form, permanent global bearer form or permanent global
registered form, or any combination thereof, as specified as contemplated by
Section 301, and if any combination thereof is so specified, as requested by
the beneficial owner thereof; provided, however, that no definitive Bearer
Security or permanent global Security shall be delivered in exchange for a
temporary Bearer Security except in compliance with the conditions set forth in
Section 303.

         Unless otherwise specified in the temporary global Security, the
interest of a beneficial owner of Securities of a series in a temporary global
Security shall be exchanged on the Exchange Date for definitive Securities (and
where the form of the definitive Securities is not specified by the Holder for
an interest in a permanent global Security) of the same series and of like
tenor unless, on or prior to the Exchange Date, such beneficial owner has not
delivered to Euro-clear or CEDEL S.A., as the case may be, a certificate in the
form set forth in Exhibit A to this Indenture dated no earlier than the
Certification Date, copies of which certificate shall be available from the
offices of Euro-clear and CEDEL S.A., the Trustee, any Authenticating Agent
appointed for such series of Securities and each Paying Agent and after the
Exchange Date, the interest of a beneficial owner of Securities of a series in
a temporary global Security shall be exchanged for definitive Securities (and
where the form of the definitive Securities is not specified by the Holder for
an interest in a permanent global Security) of the same series and of like
tenor following such beneficial owner's delivery to Euro-clear or CEDEL S.A.,
as the case may be, of a certificate in the form set forth in Exhibit A to this
Indenture





                                      -21-
<PAGE>   28
dated no earlier than the Certification Date.  Unless otherwise specified in
such temporary global Security, any exchange shall be made free of charge to
the beneficial owners of such temporary global Security, except that a Person
receiving definitive Securities must bear the cost of insurance, postage,
transportation and the like in the event that such Person does not take
delivery of such definitive Securities in person at the offices of Euro-clear
or CEDEL S.A.  Definitive Securities in bearer form to be delivered in exchange
for any portion of a temporary global Security shall be delivered only outside
the United States.

         Until exchanged in full as hereinabove provided, the temporary
Securities of any series shall in all respects be entitled to the same benefits
under this Indenture as definitive Securities of the same series and of like
tenor authenticated and delivered hereunder, except that, unless otherwise
specified as contemplated by Section 301, interest payable on a temporary
global Security on an Interest Payment Date for Securities of such series shall
be payable to Euro-clear and CEDEL S.A. on such Interest Payment Date upon
delivery by Euro-clear and CEDEL S.A. to the Trustee of a certificate or
certificates in the form set forth in Exhibit B to this Indenture, for credit
without further interest on or after such Interest Payment Date to the
respective accounts of the Persons who are the beneficial owners of such
temporary global Security on such Interest Payment Date and who have each
delivered to Euro-clear or CEDEL S.A., as the case may be, a certificate in the
form set forth in Exhibit A to this Indenture.  Any interest so received by
Euro-clear and CEDEL S.A. and not paid as herein provided shall be returned to
the Trustee immediately prior to the expiration of two years after such
Interest Payment Date in order to be repaid to the Company in accordance with
Section 1003.

SECTION 305.  Registration, Registration of Transfer and Exchange.

         The Company shall cause to be kept at an office or agency to be
maintained by the Company in accordance with Section 1002 a register (being the
combined register of the Security Registrar and all transfer agents designated
pursuant to Section 1002 for the purpose of registration of transfer of
Securities and sometimes collectively referred to as the "Security Register")
in which, subject to such reasonable regulations as it may prescribe, the
Company shall provide for the registration of each series of Registered
Securities and the registration of transfers of such Registered Securities.
The Trustee shall serve initially as "Security Registrar" for the purpose of
registering Registered Securities and transfers of Registered Securities as
herein provided.

         Upon surrender for registration of transfer of any Registered Security
of any series at the office or agency of the Company maintained pursuant to
Section 1002 for such purpose in a Place of Payment for such series, the
Company shall execute, and the Trustee shall authenticate and deliver, in the
name of the designated transferee or transferees, one or more new Registered
Securities of the same series of any authorized denominations and of a like
aggregate principal amount and tenor.

         At the option of the Holder, Registered Securities of any series may
be exchanged for other Registered Securities of the same series of any
authorized denominations and of a like aggregate principal amount and tenor,
upon surrender of the Securities to be exchanged at any such office or agency.
Whenever any Securities are so surrendered for exchange, the Company shall
execute, and





                                      -22-
<PAGE>   29
the Trustee shall authenticate and deliver, the Securities which the Holder
making the exchange is entitled to receive.  Unless otherwise provided with
respect to any series of Securities, Bearer Securities may not be issued in
exchange for Registered Securities.

         At the option of the Holder, Bearer Securities of any series may be
exchanged for Registered Securities of the same series of any authorized
denominations and of a like aggregate principal amount and tenor, upon
surrender of the Bearer Securities to be exchanged at any such office or
agency, with all unmatured coupons and all matured coupons in default thereto
appertaining.  If the Holder of a Bearer Security is unable to produce any such
unmatured coupon or coupons or matured coupon or coupons in default, such
exchange may be effected if the Bearer Securities are accompanied by payment in
funds acceptable to the Company in an amount equal to the face amount of such
missing coupon or coupons, or the surrender of such missing coupon or coupons
may be waived by the Company and the Trustee if there is furnished to them such
security or indemnity as they may require to save each of them and any Paying
Agent harmless.  If thereafter the Holder of such Security shall surrender to
any Paying Agent any such missing coupon in respect of which such a payment
shall have been made, such Holder shall be entitled to receive the amount of
such payment; provided, however, that, except as otherwise provided in Section
1002, interest represented by coupons shall be payable only upon presentation
and surrender of those coupons at an office or agency located outside the
United States.  Notwithstanding the foregoing, in case a Bearer Security of any
series is surrendered at any such office or agency in exchange for a Registered
Security of the same series and like tenor after the close of business at such
office or agency on (i) any Regular Record Date and before the opening of
business at such office or agency on the relevant Interest Payment Date, or
(ii) any Special Record Date and before the opening of business at such office
or agency on the related proposed date for payment of Defaulted Interest, such
Bearer Security shall be surrendered without the coupon relating to such
Interest Payment Date or proposed date for payment, as the case may be, and
interest or Defaulted Interest, as the case may be, will not be payable on such
Interest Payment Date or proposed date for payment, as the case may be, in
respect of the Registered Security issued in exchange for such Bearer Security
but will be payable only to the Holder of such coupon when due in accordance
with the provisions of this Indenture.

         Whenever any Securities are so surrendered for exchange, the Company
shall execute, and the Trustee shall authenticate and deliver, the Securities
which the Holder making the exchange is entitled to receive.

         Notwithstanding the foregoing, except as otherwise specified as
contemplated by Section 301, any permanent global Security shall be
exchangeable only as provided in this paragraph.  If the beneficial owners of
interests in a permanent global Security are entitled to exchange such
interests for Securities of such series and of like tenor and principal amount
of another authorized form and denomination, as specified as contemplated by
Section 301, then without unnecessary delay but in any event not later than the
earliest date on which such interests may be so exchanged, the Company shall
deliver to the Trustee definitive Securities of that series in an aggregate
principal amount equal to the principal amount of such permanent global
Security, executed by the Company.  On or after the earliest date on which such
interests may be so exchanged, such permanent global Security shall be
surrendered from time to time in accordance with instructions given to the
Trustee and the Common Depositary (which instructions shall be in writing but
need not comply with Section 102





                                      -23-
<PAGE>   30
or be accompanied by an Opinion of Counsel) by the Common Depositary or such
other depositary as shall be specified in the Company Order with respect
thereto to the Trustee, as the Company's agent for such purpose, to be
exchanged, in whole or in part, for definitive Securities of the same series
without charge, and the Trustee shall authenticate and deliver, in exchange for
each portion of such permanent global Security, a like aggregate principal
amount of definitive Securities of the same series of authorized denominations
and of like tenor as the portion of such permanent global Security to be
exchanged which, unless the Securities of the series are not issuable both as
Bearer Securities and as Registered Securities, as specified as contemplated by
Section 301, shall be in the form of Bearer Securities or Registered
Securities, or any combination thereof, as shall be specified by the beneficial
owner thereof; provided, however, that no such exchanges may occur during a
period beginning at the opening of business 15 days before any selection of
Securities of that series for redemption and ending on the relevant Redemption
Date; and provided, further, that no Bearer Security delivered in exchange for
a portion of a permanent global Security shall be mailed or otherwise delivered
to any location in the United States.  Promptly following any such exchange in
part, such permanent global Security shall be returned by the Trustee to the
Common Depositary or such other depositary referred to above in accordance with
the instructions of the Company referred to above.  If a Registered Security is
issued in exchange for any portion of such permanent global Security after the
close of business at the office or agency where such exchange occurs on (i) any
Regular Record Date and before the opening of business at such office or agency
on the relevant Interest Payment Date, or (ii) any Special Record Date and
before the opening of business at such office or agency on the related proposed
date for payment of Defaulted Interest, interest or Defaulted Interest, as the
case may be, will not be payable on such Interest Payment Date or proposed date
for payment, as the case may be, in respect of such Registered Security, but
will be payable on such Interest Payment Date or proposed date for payment, as
the case may be, only to the Person to whom interest in respect of such portion
of such permanent global Security is payable in accordance with provisions of
this Indenture.

         All Securities issued upon any registration of transfer or exchange of
Securities shall be the valid obligations of the Company, evidencing the same
debt, and entitled to the same benefits under this Indenture, as the Securities
surrendered upon such registration of transfer or exchange.

         Every Registered Security presented or surrendered for registration of
transfer or exchange shall (if so required by the Company or the Trustee or any
transfer agent) be duly endorsed, or be accompanied by a written instrument of
transfer in form satisfactory to the Company and the Security Registrar or any
transfer agent duly executed, by the Holder thereof or his attorney duly
authorized in writing.

         No service charge shall be made for any registration of transfer or
exchange of Securities, but the Company may require payment of a sum sufficient
to cover any tax or other governmental charge that may be imposed in connection
with any registration of transfer or exchange of Securities, other than
exchanges pursuant to Section 304, 906 or 1107 not involving any transfer.

         The Company shall not be required (i) to issue, register the transfer
of or exchange Securities of any series during a period beginning at the
opening of business 15 days before any selection of Securities of that series
for redemption and ending at the close of business on (A) if Securities of the





                                      -24-
<PAGE>   31
series are issuable only as Registered Securities, the day of the mailing of
the relevant notice of redemption and (B) if Securities of the series are
issuable as Bearer Securities, the day of the first publication of the relevant
notice of redemption or, if Securities of the series are also issuable as
Registered Securities and there is no publication, the mailing of the relevant
notice of redemption, or (ii) to register the transfer of or exchange any
Registered Security so selected for redemption, in whole or in part, except the
unredeemed portion of any Registered Security being redeemed in part, or (iii)
to exchange any Bearer Security so selected for redemption except that such a
Bearer Security may be exchanged for a Registered Security of that series and
like tenor, provided that such Registered Security shall be simultaneously
surrendered for redemption.

         Notwithstanding the foregoing and except as otherwise specified as
contemplated by Section 301, any Book-Entry Security shall be exchangeable
pursuant to this Section 305 or Sections 304, 906 and 1107 for Securities
registered in the name of, and a transfer of a Book-Entry Security of any
series may be registered to, any Person other than the Depository for such
Security or its nominee only if (i) such Depository notifies the Company that
it is unwilling or unable to continue as Depository for such Book-Entry
Security or if at any time such Depository ceases to be a clearing agency
registered under the Securities Exchange Act of 1934, or (ii) the Company
executes and delivers to the Trustee a Company Order that such Book-Entry
Security shall be so exchangeable and the transfer thereof so registrable.
Upon the occurrence in respect of any Book-Entry Security of any series of any
one or more of the conditions specified in clause (i) or  (ii) of the preceding
sentence or such other conditions as may be specified, such Book-Entry Security
may be exchanged for Securities registered in the names of, and the transfer of
such Book-Entry Security may be registered to, such Persons (including Persons
other than the Depository with respect to such series and its nominees) as such
Depository shall direct.  Notwithstanding any other provision of this
Indenture, any Security authenticated and delivered upon registration of
transfer of, or in exchange for, or in lieu of, any Book-Entry Security shall
also be a Book-Entry Security and shall bear the legend specified in Section
204 except for any Security authenticated and delivered in exchange for, or
upon registration of transfer of, a Book-Entry Security pursuant to the
preceding sentence.

SECTION 306.  Mutilated, Destroyed, Lost and Stolen Securities and Coupons.

         If any mutilated Security or a Security with a mutilated coupon
appertaining thereto is surrendered to the Trustee, the Company shall execute
and the Trustee shall authenticate and deliver in exchange therefor a new
Security of the same series and of like tenor and principal amount and bearing
a number not contemporaneously outstanding, with coupons corresponding to the
coupons, if any, appertaining to the surrendered Security.

         If there shall be delivered to the Company and the Trustee (i)
evidence to their satisfaction of the destruction, loss or theft of any
Security or coupon and (ii) such security or indemnity as may be required by
them to save each of them and any agent of either of them harmless, then, in
the absence of notice to the Company or the Trustee that such Security or
coupon has been acquired by a bona fide purchaser, the Company shall execute
and the Trustee shall authenticate and deliver, in lieu of any such destroyed,
lost or stolen Security or in exchange for the Security to which a destroyed,
lost or stolen coupon appertains (with all appurtenant coupons not destroyed,
lost or





                                      -25-
<PAGE>   32
stolen), a new Security of the same series and of like tenor and principal
amount and bearing a number not contemporaneously outstanding, with coupons
corresponding to the coupons, if any, appertaining to such destroyed, lost or
stolen Security or to the Security to which such destroyed, lost or stolen
coupon appertains.

         If, after the delivery of such new Security, a bona fide purchaser of
the original Security in lieu of which such new security was issued presents
for payment or registration such original Security, the Trustee shall be
entitled to recover such new Security from the person to whom it was delivered
or any person taking therefrom, except a bona fide purchaser, and shall be
entitled to recover upon the security or indemnity provided therefor to the
extent of any loss, damage, cost or expense incurred by the Company or Trustee
in connection therewith.

         In case any such mutilated, destroyed, lost or stolen Security or
coupon has become or is about to become due and payable, the Company in its
discretion may, instead of issuing a new Security, pay such Security or coupon;
provided, however, that the principal of and any premium and interest on Bearer
Securities shall, except as otherwise provided in Section 1002, be payable only
at an office or agency located outside the United States.

         Upon the issuance of any new Security under this Section, the Company
may require payment of a sum sufficient to cover any tax or other governmental
charge that may be imposed in relation thereto and any other expenses
(including the fees, and expenses of the Trustee) connected therewith.

         Every new Security of any series with its coupons, if any, issued
pursuant to this Section in lieu of any destroyed, lost or stolen Security or
in exchange for a Security to which a destroyed, lost or stolen coupon
appertains, shall constitute an original additional contractual obligation of
the Company, whether or not the destroyed, lost or stolen Security and its
coupons, if any, or the destroyed, lost or stolen coupon shall be at any time
enforceable by anyone, and any such new Security and coupons, if any, shall be
entitled to all the benefits of this Indenture equally and proportionately with
any and all other Securities of that series and their coupons, if any, duly
issued hereunder.

         The provisions of this Section are exclusive and shall preclude (to
the extent lawful) all other rights and remedies with respect to the
replacement or payment of mutilated, destroyed, lost or stolen Securities or
coupons.

SECTION 307.  Payment of Interest; Interest Rights Preserved.

         Unless otherwise provided as contemplated by Section 301 with respect
to any series of Securities, interest on any Registered Security which is
payable, and is punctually paid or duly provided for, on any Interest Payment
Date shall be paid to the Person in whose name that Security (or one or more
Predecessor Securities) is registered at the close of business on the Regular
Record Date for such interest.  Unless otherwise so provided, at the option of
the Company, payment of interest on any Registered Security may be made by
check mailed on or before the due date to the address of the Person entitled
thereto as such address shall appear in the Security Register.





                                      -26-
<PAGE>   33
         Any interest on any Registered Security of any series which is
payable, but is not punctually paid or duly provided for, on any Interest
Payment Date (herein called "Defaulted Interest") shall forthwith cease to be
payable to the Holder on the relevant Regular Record Date by virtue of having
been such Holder, and such Defaulted Interest may be paid by the Company, at
its election in each case, as provided in clause (1) or (2) below:

                 (1)      The Company may elect to make payment of any
         Defaulted Interest to the Persons in whose names the Registered
         Securities of such series (or their respective Predecessor Securities)
         are registered at the close of business on a Special Record Date for
         the payment of such Defaulted Interest, which shall be fixed in the
         following manner.  The Company shall notify the Trustee in writing of
         the amount of Defaulted Interest proposed to be paid on each
         Registered Security of such series and the date of the proposed
         payment, and at the same time the Company shall deposit with the
         Trustee an amount of money equal to the aggregate amount proposed to
         be paid in respect of such Defaulted Interest or shall make
         arrangements satisfactory to the Trustee for such deposit prior to the
         date of the proposed payment, such money when deposited to be held in
         trust for the benefit of the Persons entitled to such Defaulted
         Interest as in this Clause provided.  Thereupon the Trustee shall fix
         a Special Record Date for the payment of such Defaulted Interest which
         shall be not more than 15 days and not less than 10 days prior to the
         date of the proposed payment and not less than 10 days after the
         receipt by the Trustee of the notice of the proposed payment.  The
         Trustee shall promptly notify the Company of such Special Record Date
         and, in the name and at the expense of the Company, shall cause notice
         of the proposed payment of such Defaulted Interest and the Special
         Record Date therefor to be mailed, first-class postage prepaid, to
         each Holder of Registered Securities of such series at the address of
         such Holder as it appears in the Security Register, not less than 10
         days prior to such Special Record Date.  Notice of the proposed
         payment of such Defaulted Interest and the Special Record Date
         therefor having been so mailed, such Defaulted Interest shall be paid
         to the Persons in whose names the Registered Securities of such series
         (or their respective Predecessor Securities) are registered at the
         close of business on such Special Record Date and shall no longer be
         payable pursuant to the following clause (2).

                 (2)      The Company may make payment of any Defaulted
         Interest on the Registered Securities of any series in any other
         lawful manner not inconsistent with the requirements of any securities
         exchange on which such Securities may be then listed, and upon such
         notice as may be required by such exchange, if, after notice given by
         the Company to the Trustee of the proposed payment pursuant to this
         clause, such manner of payment shall be deemed practicable by the
         Trustee.

         Subject to the foregoing provisions of this Section and Section 305,
each Security delivered under this Indenture upon registration of transfer of
or in exchange for or in lieu of any other Security shall carry the rights to
interest accrued and unpaid, and to accrue, which were carried by such other
Security.





                                      -27-
<PAGE>   34
SECTION 308.  Persons Deemed Owners.

         Prior to due presentment of a Registered Security for registration of
transfer, the Company, the Trustee and any agent of the Company or the Trustee
may treat the Person in whose name such Registered Security is registered as
the owner of such Registered Security for the purpose of receiving payment of
principal of (and premium, if any) and (subject to Sections 305 and 307) any
interest on such Security and for all other purposes whatsoever, whether or not
such Security be overdue, and neither the Company, the Trustee nor any agent of
the Company or the Trustee shall be affected by notice to the contrary.

         Title to any Bearer Security and any coupons appertaining thereto
shall pass by delivery.  The Company, the Trustee and any agent of the Company
or the Trustee may treat the bearer of any Bearer Security and the bearer of
any coupon as the owner of such Security or coupon for the purpose of receiving
payment thereof or on account thereof and for all other purposes whatsoever,
whether or not such Security or coupon be overdue, and neither the Company, the
Trustee nor any agent of the Company or the Trustee shall be affected by notice
to the contrary.

         Notwithstanding the foregoing, with respect to any Book-Entry
Security, nothing herein shall prevent the Company, the Trustee, or any agent
of the Company or the Trustee, from giving effect to any written certification,
proxy or other authorization furnished by a Depository or impair, as between a
Depository and holders of beneficial interests in any Book-Entry Security, the
operation of customary practices governing the exercise of the rights of the
Depository (or its nominee) as Holder of such Book-Entry Security.

SECTION 309.  Cancellation.

         All Securities and coupons surrendered for payment, redemption,
registration of transfer or exchange or for credit against any sinking fund
payment shall, if surrendered to any Person other than the Trustee, be
delivered to the Trustee.  All Registered Securities and matured coupons so
delivered shall be promptly canceled by the Trustee.  All Bearer Securities and
unmatured coupons so delivered shall be held by the Trustee and, upon
instruction by a Company Order, shall be canceled or held for reissuance.
Bearer Securities and unmatured coupons held for reissuance may be reissued
only in replacement of mutilated, lost, stolen or destroyed Bearer Securities
of the same series and like tenor or the related coupons pursuant to Section
306.  All Bearer Securities and unmatured coupons held by the Trustee pending
such cancellation or reissuance shall be deemed to be delivered for all
purposes of this Indenture and the Securities.  The Company may at any time
deliver to the Trustee for cancellation any Securities previously authenticated
and delivered hereunder which the Company may have acquired in any manner
whatsoever, and may deliver to the Trustee (or to any other Person for delivery
to the Trustee) for cancellation any Securities previously authenticated
hereunder which the Company has not issued and sold, and all Securities so
delivered shall be promptly canceled by the Trustee.  No Securities shall be
authenticated in lieu of or in exchange for any Securities canceled as provided
in this Section, except as expressly permitted by this Indenture.  All canceled
Securities and coupons held by the Trustee shall be disposed of in accordance
with its customary practice.





                                      -28-
<PAGE>   35
SECTION 310.  Computation of Interest.

         Except as otherwise specified as contemplated by Section 301 for
Securities of any series, interest on the Securities of each series shall be
computed on the basis of a 360-day year of twelve 30-day months.

                                  ARTICLE FOUR
                           SATISFACTION AND DISCHARGE

SECTION 401.  Satisfaction and Discharge of Indenture.

         This Indenture shall upon Company Request cease to be of further
effect (except as to any surviving rights of registration of transfer or
exchange of Securities herein expressly provided for, and any right to receive
additional amounts, as provided in Section 1004), and the Trustee, at the
expense of the Company, shall execute proper instruments acknowledging
satisfaction and discharge of this Indenture, when

         (1)     either

                 (A)      all Securities theretofore authenticated and
         delivered and all coupons, if any, appertaining thereto (other than
         (i) coupons appertaining to Bearer Securities surrendered for exchange
         for Registered Securities and maturing after such exchange, whose
         surrender is not required or has been waived as provided in Section
         305, (ii) Securities and coupons which have been destroyed, lost or
         stolen and which have been replaced or paid as provided in Section
         306, (iii) coupons appertaining to Securities called for redemption
         and maturing after the relevant Redemption Date, whose surrender has
         been waived as provided in Section 1106, and (iv) Securities and
         coupons for whose payment money has theretofore been deposited in
         trust or segregated and held in trust by the Company and thereafter
         repaid to the Company or discharged from such trust, as provided in
         Section 1003) have been delivered to the Trustee for cancellation; or

                 (B)      all such Securities and, in the case of (i) or (ii)
         below, any coupons appertaining thereto not theretofore delivered to
         the Trustee for cancellation

                          (i)     have become due and payable, or

                          (ii)    will become due and payable at their Stated
                 Maturity within one year, or

                          (iii)   are to be called for redemption within one
                 year under arrangements satisfactory to the Trustee for the
                 giving of notice of redemption by the Trustee in the name, and
                 at the expense, of the Company;

         and the Company, in the case of (i), (ii) or (iii) above, has
         deposited or caused to be deposited with the Trustee as trust funds in
         trust for the purpose an amount sufficient to pay





                                      -29-
<PAGE>   36
         and discharge the entire indebtedness on such Securities and coupons
         not theretofore delivered to the Trustee for cancellation, for
         principal (and premium, if any) and any interest to the date of such
         deposit (in the case of Securities which have become due and payable)
         or to the Stated Maturity or Redemption Date, as the case may be;

         (2)     the Company has paid or caused to be paid all other sums
payable hereunder by the Company; and

         (3)     the Company has delivered to the Trustee an Officers'
Certificate and an Opinion of Counsel, each stating that all conditions
precedent herein provided for relating to the satisfaction and discharge of
this Indenture have been complied with.

         Notwithstanding the satisfaction and discharge of this Indenture, the
obligations of the Company to the Trustee under Section 607, the obligations of
the Trustee to any Authenticating Agent under Section 614 and, if money shall
have been deposited with the Trustee pursuant to clause (1)(B) of this Section,
the obligations of the Trustee under Section 402 and the last paragraph of
Section 1003 shall survive.

SECTION 402.  Application of Trust Money.

         Subject to the provisions of the last paragraph of Section 1003, all
money deposited with the Trustee pursuant to Section 401 shall be held in trust
and applied by it, in accordance with the provisions of the Securities, the
coupons and this Indenture, to the payment, either directly or through any
Paying Agent (including the Company acting as its own Paying Agent) as the
Trustee may determine, to the Persons entitled thereto, of the principal and
any premium and interest for whose payment such money has been deposited.

                                  ARTICLE FIVE
                                    REMEDIES

SECTION 501.  Events of Default.

         "Event of Default", wherever used herein with respect to Securities of
any series, means any one of the following events (whatever the reason for such
Event of Default and whether it shall be voluntary or involuntary or be
effected by any subordination provisions applicable to the Securities or by
operation of law or pursuant to any judgment, decree or order, rule or
regulation of any administrative or governmental body), unless it is either
inapplicable to a particular series of Securities or it is specifically deleted
or modified in or pursuant to the terms of such series or in the form of
Security of such series:

                 (1)      default in the payment of any interest upon any
         Security of that series when it becomes due and payable, and
         continuance of such default for a period of 30 days; or

                 (2)      default in the payment of the principal of (or
         premium, if any, on) any Security of that series at its Maturity; or





                                      -30-
<PAGE>   37
                 (3)      default in the deposit of any sinking fund payment,
         when and as due by the terms of a Security of that series; or

                 (4)      default in the performance, or breach, of any
         covenant of the Company in this Indenture (other than a covenant a
         default in whose performance or whose breach is elsewhere in this
         Section specifically dealt with or which has expressly been included
         in this Indenture solely for the benefit of series of Securities other
         than that series), and continuance of such default or breach for a
         period of 60 days after there has been given, by registered or
         certified mail, to the Company by the Trustee or to the Company and
         the Trustee by the Holders of at least 25% in principal amount of the
         Outstanding Securities of that series a written notice specifying such
         default or breach and requiring it to be remedied and stating that
         such notice is a "Notice of Default" hereunder; or

                 (5)      the entry by a court having jurisdiction in the
         premises of (A) a decree or order for relief in respect of the Company
         in an involuntary case or proceeding under any applicable Federal or
         State bankruptcy, insolvency, reorganization or other similar law or
         (B) a decree or order adjudging the Company a bankrupt or insolvent,
         or approving as properly filed a petition seeking reorganization,
         arrangement, adjustment or composition of or in respect of the Company
         under any applicable Federal or State law, or appointing a custodian,
         receiver, liquidator, assignee, trustee, sequestrator or other similar
         official of the Company or of any substantial part of its property, or
         ordering the winding up or liquidation of its affairs, and the
         continuance of any such decree or order for relief or any such other
         decree or order unstayed and in effect for a period of 90 consecutive
         days; or

                 (6)      the commencement by the Company of a voluntary case
         or proceeding under any applicable Federal or State bankruptcy,
         insolvency, reorganization or other similar law or of any other case
         or proceeding to be adjudicated a bankrupt or insolvent, or the
         consent by it to the entry of a decree or order for relief in respect
         of the Company in an involuntary case or proceeding under any
         applicable Federal or State bankruptcy, insolvency, reorganization or
         other similar law or the commencement of any bankruptcy or insolvency
         case or proceeding against it, or the filing by it of a petition or
         answer or consent seeking reorganization or relief under any
         applicable Federal or State law, or the consent by it to the filing of
         such petition or to the appointment of or taking possession by a
         custodian, receiver, liquidator, assignee, trustee, sequestrator or
         similar official of the Company or of any substantial part of its
         property, or the making by it of an assignment for the benefit of
         creditors, or the admission by it in writing of its inability to pay
         its debts generally as they become due, or the taking of corporate
         action by the Company in furtherance of any such action; or

                 (7)      any other Event of Default provided with respect to
         Securities of that series.

SECTION 502.  Acceleration of Maturity; Rescission and Annulment.

         If an Event of Default with respect to Securities of any series at the
time Outstanding occurs and is continuing, then in every such case the Trustee
or the Holders of not less than 25% in principal





                                      -31-
<PAGE>   38
amount of the Outstanding Securities of that series may declare the principal
amount (or, if any of the Securities of that series are Original Issue Discount
Securities, such portion of the principal amount of such Securities as may be
specified in the terms thereof) of all of the Securities of that series to be
due and payable immediately, by a notice in writing to the Company (and to the
Trustee if given by Holders), and upon any such declaration such principal
amount (or specified amount) shall become immediately due and payable.

         At any time after such a declaration of acceleration with respect to
Securities of any series has been made and before a judgment or decree for
payment of the money due has been obtained by the Trustee as hereinafter in
this Article provided, the Holders of a majority in principal amount of the
Outstanding Securities of that series, by written notice to the Company and the
Trustee, may rescind and annul such declaration and its consequences if

                 (1)      the Company has paid or deposited with the Trustee a
         sum sufficient to pay
         
                          (A)     all overdue interest on all Securities of
                 that series,

                          (B)     the principal of (and premium, if any, on)
                 any Securities of that series which have become due otherwise
                 than by such declaration of acceleration and any interest
                 thereon at the rate or rates prescribed therefor in such
                 Securities,

                          (C)     to the extent that payment of such interest
                 is lawful, interest upon overdue interest at the rate or rates
                 prescribed therefor in such Securities, and

                          (D)     all sums paid or advanced by the Trustee
                 hereunder and the reasonable compensation, expenses,
                 disbursements and advances of the Trustee, its agents and
                 counsel;

         and

                 (2)      all Events of Default with respect to Securities of
         that series, other than the non-payment of the principal of Securities
         of that series which have become due solely by such declaration of
         acceleration, have been cured or waived as provided in Section 513.

No such rescission shall affect any subsequent default or impair any right
consequent thereon.

SECTION 503.  Collection of Indebtedness and Suits for Enforcement by Trustee.

         The Company covenants that if

                 (1)      default is made in the payment of any interest on any
         Security when such interest becomes due and payable and such default
         continues for a period of 30 days, or

                 (2)      default is made in the payment of the principal of
         (or premium, if any, on) any Security at the Maturity thereof,





                                      -32-
<PAGE>   39
the Company will, upon demand of the Trustee, pay to it, for the benefit of the
Holders of such Securities and coupons, the whole amount then due and payable
on such Securities and coupons for principal and any premium and interest and,
to the extent that payment of such interest shall be legally enforceable,
interest on any overdue principal and premium and on any overdue interest, at
the rate or rates prescribed therefor in such Securities and, in addition
thereto, such further amount as shall be sufficient to cover the costs and
expenses of collection, including the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel.

         If the Company fails to pay such amounts forthwith upon such demand,
the Trustee, in its own name and as trustee of an express trust, may institute
a judicial proceeding for the collection of the sums so due and unpaid, may
prosecute such proceeding to judgment or final decree and may enforce the same
against the Company or any other obligor upon such Securities and collect the
moneys adjudged or decreed to be payable in the manner provided by law out of
the property of the Company or any other obligor upon such Securities, wherever
situated.

         If an Event of Default with respect to Securities of any series occurs
and is continuing, the Trustee may in its discretion proceed to protect and
enforce its rights and the rights of the Holders of Securities of such series
and any related coupons by such appropriate judicial proceedings as the Trustee
shall deem most effectual to protect and enforce any such rights, whether for
the specific enforcement of any covenant or agreement in this Indenture or in
aid of the exercise of any power granted herein, or to enforce any other proper
remedy.

SECTION 504.  Trustee May File Proofs of Claim.

         In case of any judicial proceeding relative to the Company (or any
other obligor upon the Securities), its property or its creditors, the Trustee
shall be entitled and empowered, by intervention in such proceeding or
otherwise, to take any and all actions authorized under the Trust Indenture Act
in order to have claims of the Holders and the Trustee allowed in any such
proceeding.  In particular, the Trustee shall be authorized to collect and
receive any moneys or other property payable or deliverable on any such claims
and to distribute the same; and any custodian, receiver, assignee, trustee,
liquidator, sequestrator or other similar official in any such judicial
proceeding is hereby authorized by each Holder to make such payments to the
Trustee and, in the event that the Trustee shall consent to the making of such
payments directly to the Holders, to pay to the Trustee any amount due it for
the reasonable compensation, expenses, disbursements and advances of the
Trustee, its agents and counsel, and any other amounts due the Trustee under
Section 607.

         No provision of this Indenture shall be deemed to authorize the
Trustee to authorize or consent to or accept or adopt on behalf of any Holder
any plan of reorganization, arrangement, adjustment or composition affecting
the Securities or the rights of any Holder thereof or to authorize the Trustee
to vote in respect of the claim of any Holder in any such proceeding; provided,
however, that the Trustee may, on behalf of Holders, vote for the election of a
trustee of bankruptcy or similar official and be a member of a creditors' or
other similar committee.





                                      -33-
<PAGE>   40
SECTION 505.  Trustee May Enforce Claims Without Possession of Securities or
              Coupons.

         All rights of action and claims under this Indenture or the Securities
or coupons may be prosecuted and enforced by the Trustee without the possession
of any of the Securities or coupons or the production thereof in any proceeding
relating thereto, and any such proceeding instituted by the Trustee shall be
brought in its own name as trustee of an express trust, and any recovery of
judgment shall, after provision for the payment of reasonable compensation,
expenses, disbursements and advances of the Trustee, its agents and counsel, be
for the ratable benefit of the Holders of the Securities and coupons in respect
of which such judgment has been recovered.

SECTION 506.  Application of Money Collected.

         Any money collected by the Trustee pursuant to this Article shall be
applied in the following order, at the date or dates fixed by the Trustee and,
in case of the distribution of such money on account of principal or any
premium or interest, upon presentation of the Securities or coupons, or both as
the case may be, and the notation thereon of the payment if only partially paid
and upon surrender thereof if fully paid:

                 FIRST:  To the payment of all amounts due the Trustee under
         Section 607; and

                 SECOND:  Subject to any subordination provisions applicable to
         the Securities, to the payment of the amounts then due and unpaid for
         principal of and any premium and interest on the Securities and
         coupons in respect of which or for the benefit of which such money has
         been collected, ratably, without preference or priority of any kind,
         according to the amounts due and payable on such Securities and
         coupons for principal and any premium and interest, respectively.

         In any case in which Securities are Outstanding that are denominated
in more than one currency and the Trustee is directed to make ratable payments
under this Section to Holders of such Securities, unless otherwise provided
with respect to any series of Securities, the Trustee shall calculate the
amount of such payments as follows:  (i) as of the day the Trustee collects an
amount under this Article, the Trustee shall, as to each Holder of a Security
to whom an amount is due and payable under this Section that is denominated in
a foreign currency, determine that amount in Dollars that would be obtained for
the amount owing such Holder, using the rate of exchange at which in accordance
with normal banking procedures the Trustee could purchase in The City of New
York Dollars with such amount owing; (ii) calculate the sum of all Dollar
amounts determined under (i) and add thereto any amounts due and payable in
Dollars; and (iii) using the individual amounts determined in (i) or any
individual amounts due and payable in Dollars, as the case may be, as a
numerator, and the sum calculated in (ii) as a denominator, calculate as to
each Holder of a Security to whom an amount is owed under this Section the
fraction of the amount collected under this Article payable to such Holder.
Any expenses incurred by the Trustee in actually converting amounts owing
Holders of Securities denominated in a currency other than that in which any
amount is collected under this Article shall be likewise (in accordance with
this paragraph) borne ratably by all Holders of Securities to whom amounts are
payable under this Section.





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<PAGE>   41
         To the fullest extent allowed under applicable law, if for the purpose
of obtaining judgment against the Company in any court it is necessary to
convert the sum due in respect of the principal of, or premium, if any, or
interest on, the Securities of any series (the "Required Currency") into a
currency in which a judgment will be rendered (the "Judgment Currency"), the
rate of exchange used shall be the rate at which in accordance with normal
banking procedures the Trustee could purchase in The City of New York the
Required Currency with the Judgment Currency on the Business Day in the City of
New York next preceding that on which final judgment is given.  Neither the
Company nor the Trustee shall be liable for any shortfall nor shall it benefit
from any windfall in payments to Holders of Securities under this Section
caused by a change in exchange rates between the time the amount of a judgment
against the Company is calculated as above and the time the Trustee converts
the Judgment Currency into the Required Currency to make payments under this
Section to Holders of Securities, but payment of such judgment shall discharge
all amounts owed by the Company on the claim or claims underlying such
judgment.

SECTION 507.  Limitation on Suits.

         No Holder of any Security of any series or any related coupons shall
have any right to institute any proceeding, judicial or otherwise, with respect
to this Indenture, or for the appointment of a receiver or trustee, or for any
other remedy hereunder, unless:

                 (1)      such Holder has previously given written notice to
         the Trustee of a continuing Event of Default with respect to the
         Securities of that series;

                 (2)      the Holders of not less than 25% in principal amount
         of the Outstanding Securities of that series shall have made written
         request to the Trustee to institute proceedings in respect of such
         Event of Default in its own name as Trustee hereunder;

                 (3)      such Holder or Holders have offered to the Trustee
         reasonable indemnity against the costs, expenses and liabilities to be
         incurred in compliance with such request;

                 (4)      the Trustee for 60 days after its receipt of such
         notice, request and offer of indemnity has failed to institute any
         such proceeding; and

                 (5)      no direction inconsistent with such written request
         has been given to the Trustee during such 60-day period by the Holders
         of a majority in principal amount of the Outstanding Securities of
         that series;

it being understood and intended that no one or more of such Holders shall have
any right in any manner whatever by virtue of, or by availing of, any provision
of this Indenture to affect, disturb or prejudice the rights of any other of
such Holders, or to obtain or to seek to obtain priority or preference over any
other of such Holders or to enforce any right under this Indenture, except in
the manner herein provided and for the equal and ratable benefit of all such
Holders.





                                      -35-
<PAGE>   42
SECTION 508.  Unconditional Right of Holders to Receive Principal, Premium and
              Interest.

         Notwithstanding any other provision in this Indenture, the Holder of
any Security or coupon shall have the right, which is absolute and
unconditional, to receive payment of the principal of and any premium and
(subject to Sections 305 and 307) any interest on such Security or payment of
such coupon on the Stated Maturity or Maturities expressed in such Security or
coupon (or, in the case of redemption, on the Redemption Date) and to institute
suit for the enforcement of any such payment, and such rights shall not be
impaired without the consent of such Holder.

SECTION 509.  Restoration of Rights and Remedies.

         If the Trustee or any Holder of a Security or coupon has instituted
any proceeding to enforce any right or remedy under this Indenture and such
proceeding has been discontinued or abandoned for any reason, or has been
determined adversely to the Trustee or to such Holder, then and in every such
case, subject to any determination in such proceeding, the Company, the Trustee
and the Holders of Securities and coupons shall be restored severally and
respectively to their former positions hereunder and thereafter all rights and
remedies of the Trustee and the Holders shall continue as though no such
proceeding had been instituted.

SECTION 510.  Rights and Remedies Cumulative.

         Except as otherwise provided with respect to the replacement or
payment of mutilated, destroyed, lost or stolen Securities or coupons in the
last paragraph of Section 306, no right or remedy herein conferred upon or
reserved to the Trustee or to the Holders of Securities or coupons is intended
to be exclusive of any other right or remedy, and every right and remedy shall,
to the extent permitted by law, be cumulative and in addition to every other
right and remedy given hereunder or now or hereafter existing at law or in
equity or otherwise.  The assertion or employment of any right or remedy
hereunder, or otherwise, shall not prevent the concurrent assertion or
employment of any other appropriate right or remedy.

SECTION 511.  Delay or Omission Not Waiver.

         No delay or omission of the Trustee or of any Holder of any Security
or coupon to exercise any right or remedy accruing upon any Event of Default
shall impair any such right or remedy or constitute a waiver of any such Event
of Default or an acquiescence therein.  Every right and remedy given by this
Article or by law to the Trustee or to the Holders of Securities or coupons may
be exercised from time to time, and as often as may be deemed expedient, by the
Trustee or by the Holders of Securities or coupons, as the case may be.

SECTION 512.  Control by Holders of Securities.

         The Holders of a majority in principal amount of the Outstanding
Securities of any series shall have the right to direct the time, method and
place of conducting any proceeding for any remedy available to the Trustee, or
exercising any trust or power conferred on the Trustee, with respect to the
Securities of such series, provided that





                                      -36-
<PAGE>   43
                 (1)      such direction shall not be in conflict with any rule
         of law or with this Indenture;

                 (2)      the Trustee may take any other action deemed proper
         by the Trustee which is not inconsistent with such direction; and

                 (3)      the Trustee shall not be obligated to take any action
         unduly prejudicial to Holders not joining in such direction or
         involving the Trustee in personal liability.

SECTION 513.  Waiver of Past Defaults.

         The Holders of a majority in principal amount of the Outstanding
Securities of any series may on behalf of the Holders of all the Securities of
such series waive any past default hereunder with respect to the Securities of
such series and its consequences, except a default

                 (1)      in the payment of the principal of or any premium or
         interest on any Security of such series, or

                 (2)      in respect of a covenant or provision hereof which
         under Article Nine cannot be modified or amended without the consent
         of the Holder of each Outstanding Security of such series affected.

         Upon any such waiver, such default shall cease to exist, and any Event
of Default arising therefrom shall be deemed to have been cured, for every
purpose of this Indenture; but no such waiver shall extend to any subsequent or
other default or impair any right consequent thereon.

SECTION 514.  Undertaking for Costs.

         In any suit for the enforcement of any right or remedy under this
Indenture, or in any suit against the Trustee for any action taken, suffered or
omitted by it as Trustee, a court may require any party litigant in such suit
to file an undertaking to pay the costs of such suit, and may assess costs
against any such party litigant, in the manner and to the extent provided in
the Trust Indenture Act; provided, however, that neither this Section nor the
Trust Indenture Act shall be deemed to authorize any court to require such an
undertaking or to make such an assessment in any suit instituted by the
Company.

SECTION 515.  Waiver of Stay or Extension Laws.

         The Company covenants (to the extent that it may lawfully do so) that
it will not at any time insist upon, or plead, or in any manner whatsoever
claim to take the benefit or advantage of, any stay or extension law wherever
enacted, now or at any time hereafter in force, which may affect the covenants
or the performance of this Indenture; and the Company (to the extent that it
may lawfully do so) hereby expressly waives all benefit or advantage of any
such law and covenants that it will not hinder, delay or impede the execution
of any power herein granted to the Trustee, but will suffer and permit the
execution of every such power as though no such law had been enacted.





                                      -37-
<PAGE>   44
                                  ARTICLE SIX
                                  THE TRUSTEE

SECTION 601.  Certain Duties and Responsibilities.

         The duties and responsibilities of the Trustee shall be as provided by
the Trust Indenture Act.  Notwithstanding the foregoing, no provision of this
Indenture shall require the Trustee to expend or risk its own funds or
otherwise incur any financial liability in the performance of any of its duties
hereunder, or in the exercise of any of its rights or powers, if it shall have
reasonable grounds for believing that repayment of such funds or adequate
indemnity against such risk or liability is not reasonably assured to it.
Whether or not therein expressly so provided, every provision of this Indenture
relating to the conduct or affecting the liability of or affording protection
to the Trustee shall be subject to the provisions of this Section.

SECTION 602.  Notice of Defaults.

         If a default occurs hereunder with respect to Securities of any
series, the Trustee shall give the Holders of Securities of such series notice
of such default as and to the extent provided by the Trust Indenture Act;
provided, however, that in the case of (i) any default of the character
specified in Section 501(4) with respect to Securities of such series or (ii)
any default added to this Indenture pursuant to clause (17) of Section 301 for
the benefit of the Holders of such series, no such notice to Holders shall be
given until at least 30 days after the occurrence thereof.  For the purpose of
this Section, the term "default" means any event which is, or after notice or
lapse of time or both would become, an Event of Default with respect to
Securities of such series.

SECTION 603.  Certain Rights of Trustee.

         Subject to the provisions of Section 601:

                 (1)      the Trustee may rely and shall be protected in acting
         or refraining from acting upon any resolution, certificate, statement,
         instrument, opinion, report, notice, request, direction, consent,
         order, bond, debenture, note, other evidence of indebtedness or other
         paper or document believed by it to be genuine and to have been signed
         or presented by the proper party or parties;

                 (2)      any request or direction of the Company mentioned
         herein shall be sufficiently evidenced by a Company Request or Company
         Order and any resolution of the Board of Directors shall be
         sufficiently evidenced by a Board Resolution;

                 (3)      whenever in the administration of this Indenture the
         Trustee shall deem it desirable that a matter be proved or established
         prior to taking, suffering or omitting any action hereunder, the
         Trustee (unless other evidence be herein specifically prescribed) may,
         in the absence of bad faith on its part, rely upon an Officers'
         Certificate;





                                      -38-
<PAGE>   45
                 (4)      the Trustee may consult with counsel and the written
         advice of such counsel or any Opinion of Counsel shall be full and
         complete authorization and protection in respect of any action taken,
         suffered or omitted by it hereunder in good faith and in reliance
         thereon;

                 (5)      the Trustee shall be under no obligation to exercise
         any of the rights or powers vested in it by this Indenture at the
         request or direction of any of the Holders pursuant to this Indenture,
         unless such Holders shall have offered to the Trustee reasonable
         security or indemnity against the costs, expenses and liabilities
         which might be incurred by it in compliance with such request or
         direction;

                 (6)      the Trustee shall not be bound to make any
         investigation into the facts or matters stated in any resolution,
         certificate, statement, instrument, opinion, report, notice, request,
         direction, consent, order, bond, debenture, note, other evidence of
         indebtedness or other paper or document, but the Trustee, in its
         discretion, may make such further inquiry or investigation into such
         facts or matters as it may see fit, and, if the Trustee shall
         determine to make such further inquiry or investigation, it shall be
         entitled to examine the books, records and premises of the Company,
         personally or by agent or attorney;

                 (7)      the Trustee may execute any of the trusts or powers
         hereunder or perform any duties hereunder either directly or by or
         through agents or attorneys and the Trustee shall not be responsible
         for any misconduct or negligence on the part of any agent or attorney
         appointed with due care by it hereunder;

                 (8)      the Trustee is not required to take notice or deemed
         to have notice of any default or Event of Default hereunder, except
         Events of Default under Section 501(1) and 501(2), unless a
         Responsible Officer of the Trustee has actual knowledge thereof or has
         received notice in writing of such default or Event of Default from
         the Company or from the Holders of at least 25% in aggregate principal
         amount of the Outstanding Securities, and in the absence of any such
         notice, the Trustee may conclusively assume that no such default or
         Event of Default exists;

                 (9)      the Trustee is not required to give any bond or
         surety with respect to the performance of its duties or the exercise
         of its powers under this Indenture;

                 (10)     in the event the Trustee receives inconsistent or
         conflicting requests and indemnity from two or more groups of Holders
         of Securities, each representing less than a majority in aggregate
         principal amount of the Securities Outstanding, pursuant to the
         provisions of this Indenture, the Trustee, in its sole discretion, may
         determine what action, if any, shall be taken;

                 (11)     the permissive rights of the Trustee to take the
         actions permitted by this Indenture shall not be construed as an
         obligation or duty to do so; and

                 (12)     except for information provided by the Trustee
         concerning the Trustee, the Trustee shall have no responsibility for
         any information in any prospectus or other disclosure





                                      -39-
<PAGE>   46
         material distributed with respect to the Securities, and the Trustee
         shall have no responsibility for compliance with any state or federal
         securities laws (other than the Trust Indenture Act) in connection
         with the Securities.

SECTION 604.  Not Responsible for Recitals or Issuance of Securities.

         The recitals contained herein and in the Securities (except the
Trustee's certificates of authentication) and in any coupons shall be taken as
the statements of the Company, and the Trustee or any Authenticating Agent
assumes no responsibility for their correctness.  The Trustee makes no
representations as to the validity or sufficiency of this Indenture or of the
Securities or coupons.  The Trustee or any Authenticating Agent shall not be
accountable for the use or application by the Company of Securities or the
proceeds thereof.

SECTION 605.  May Hold Securities.

         The Trustee, any Authenticating Agent, any Paying Agent, any Security
Registrar or any other agent of the Company, in its individual or any other
capacity, may become the owner or pledgee of Securities and coupons and,
subject to Sections 608 and 613, may otherwise deal with the Company with the
same rights it would have if it were not Trustee, Authenticating Agent, Paying
Agent, Security Registrar or such other agent.  The provisions of this Section
shall extend to Affiliates of the Trustee.

SECTION 606.  Money Held in Trust.

         Money held by the Trustee in trust hereunder need not be segregated
from other funds except to the extent required by law.  The Trustee shall be
under no liability for interest on any money received by it hereunder except as
otherwise agreed with the Company.

SECTION 607.  Compensation and Reimbursement.

         The Company agrees

                 (1)      to pay to the Trustee from time to time reasonable
         compensation for all services rendered by it hereunder (which
         compensation shall not be limited by any provision of law in regard to
         the compensation of a trustee of an express trust);

                 (2)      except as otherwise expressly provided herein, to
         reimburse the Trustee and each predecessor Trustee upon its request
         for all reasonable expenses, disbursements and advances incurred or
         made by the Trustee in accordance with any provision of this Indenture
         (including the reasonable compensation and the expenses and
         disbursements of its agents and counsel), except any such expense,
         disbursement or advance as may be attributable to its negligence or
         bad faith; and

                 (3)      to indemnify the Trustee and each predecessor Trustee
         for, and to hold it harmless against, any loss, liability or expense
         incurred without negligence or bad faith on





                                      -40-
<PAGE>   47
         its part, arising out of or in connection with the acceptance or
         administration of the trust or trusts hereunder, including the costs
         and expenses of defending itself against any claim or liability in
         connection with the exercise or performance of any of its powers or
         duties hereunder.

         In the event the Trustee incurs or renders services in any proceedings
in connection with an Event of Default under Section 501(5) or 501(6) hereof,
or any event which, with the passage of time, would become such an Event of
Default, the expenses so incurred and compensation for services so rendered are
intended to constitute expenses of administration under the United States
Bankruptcy Code or equivalent law.

         As security for the performance of the obligations of the Company
under this Section the Trustee shall have a lien prior to the Securities upon
all property and funds held or collected by the Trustee as such, except funds
held in trust for the benefit of the Holders of particular Securities.

SECTION 608.  Disqualification; Conflicting Interests.

         If the Trustee has or shall acquire a conflicting interest within the
meaning of the Trust Indenture Act, the Trustee shall either eliminate such
interest or resign, to the extent and in the manner provided by, and subject to
the provisions of, the Trust Indenture Act and this Indenture.

SECTION 609.  Corporate Trustee Required; Eligibility.

         There shall at all times be a Trustee hereunder which shall be a bank
or trust company organized and doing business under the laws of the United
States of America, any State thereof or the District of Columbia, authorized
under such laws to exercise corporate trust powers, having a combined capital
and surplus of at least $50,000,000, subject to supervision or examination by
Federal or State authority.  If such corporation publishes reports of condition
at least annually, pursuant to law or to the requirements of said supervising
or examining authority, then for the purposes of this Section, the combined
capital and surplus of such corporation shall be deemed to be its combined
capital and surplus as set forth in its most recent report of condition so
published.  If at any time the Trustee shall cease to be eligible in accordance
with the provisions of this Section, it shall resign immediately in the manner
and with the effect hereinafter specified in this Article.  No obligor upon any
Security issued under this Indenture or a Person directly or indirectly
controlling, controlled by or under common control with such obligor shall
serve as Trustee under this Indenture.

SECTION 610.  Resignation and Removal; Appointment of Successor.

         (a)      No resignation or removal of the Trustee and no appointment
of a successor Trustee pursuant to this Article shall become effective until
the acceptance of appointment by the successor Trustee in accordance with the
applicable requirements of Section 611.

         (b)     The Trustee may resign at any time with respect to the
Securities of one or more series by giving written notice thereof to the
Company.  If the instrument of acceptance by a successor Trustee required by
Section 611 shall not have been delivered to the Trustee within 30





                                      -41-
<PAGE>   48
days after the giving of such notice of resignation, the resigning Trustee may
petition any court of competent jurisdiction for the appointment of a successor
Trustee with respect to the Securities of such series.

         (c)     The Trustee may be removed at any time with respect to the
Securities of any series by Act of the Holders of a majority in principal
amount of the Outstanding Securities of such series delivered to the Trustee
and to the Company.

         (d)     If at any time:

                 (1)      the Trustee shall fail to comply with Section 608
         after written request therefor by the Company or by any Holder of a
         Security who has been a bona fide Holder of a Security for at least
         six months, or

                 (2)      the Trustee shall cease to be eligible under Section
         609 and shall fail to resign after written request therefor by the
         Company or by any such Holder, or

                 (3)      the Trustee shall become incapable of acting or shall
         be adjudged a bankrupt or insolvent or a receiver of the Trustee or of
         its property shall be appointed or a public officer shall take charge
         or control of the Trustee or of its property or affairs for the
         purpose of rehabilitation, conservation or liquidation, then, in any
         case, (i) the Company by a Board Resolution may remove the Trustee
         with respect to all Securities, or (ii) subject to Section 514, any
         Holder of a Security who has been a bona fide Holder of a Security for
         at least six months may, on behalf of himself and all others similarly
         situated, petition any court of competent jurisdiction for the removal
         of the Trustee with respect to all Securities and the appointment of a
         successor Trustee or Trustees.

         (e)     If the Trustee shall resign, be removed or become incapable of
acting, or if a vacancy shall occur in the office of the Trustee for any cause,
with respect to the Securities of one or more series, the Company, by a Board
Resolution, shall promptly appoint a successor Trustee or Trustees with respect
to the Securities of that or those series (it being understood that any such
successor Trustee may be appointed with respect to the Securities of one or
more or all series and that at any time there shall be only one Trustee with
respect to the Securities of any particular series) and shall comply with the
applicable requirements of Section 611.  If, within one year after such
resignation, removal or incapability, or the occurrence of such vacancy, a
successor Trustee with respect to the Securities of any series shall be
appointed by Act of the Holders of a majority in principal amount of the
Outstanding Securities of such series delivered to the Company and the retiring
Trustee, the successor Trustee so appointed shall, forthwith upon its
acceptance of such appointment in accordance with the applicable requirements
of Section 611, become the successor Trustee with respect to the Securities of
such series and to that extent supersede the successor Trustee appointed by the
Company.  If no successor Trustee with respect to the Securities of any series
shall have been so appointed by the Company or the Holders of Securities of
such series and accepted appointment in the manner required by Section 611, any
Holder of a Security who has been a bona fide Holder of a Security of such
series for at least six months may, on behalf of himself and all others
similarly situated, petition any court of competent jurisdiction for the
appointment of a successor Trustee with





                                      -42-
<PAGE>   49
respect to the Securities of such series.  Such court may thereupon, after such
notice, if any, as it may deem proper, appoint a successor Trustee.

         (f)     The Company shall give notice of each resignation and each
removal of the Trustee with respect to the Securities of any series and each
appointment of a successor Trustee with respect to the Securities of any series
in the manner provided in Section 106.  Each notice shall include the name of
the successor Trustee with respect to the Securities of such series and the
address of its Corporate Trust Office.

SECTION 611.  Acceptance of Appointment by Successor.

         (a)     In case of the appointment hereunder of a successor Trustee
with respect to all Securities, every such successor Trustee so appointed shall
execute, acknowledge and deliver to the Company and to the retiring Trustee an
instrument accepting such appointment, and thereupon the resignation or removal
of the retiring Trustee shall become effective and such successor Trustee,
without further act, deed or conveyance, shall become vested with all the
rights, powers, trusts and duties of the retiring Trustee, with like effect as
if originally named Trustee hereunder; but on the request of the Company or the
successor Trustee, such retiring Trustee shall, upon payment of its charges,
execute and deliver an instrument transferring to such successor Trustee all
the rights, powers and trusts of the retiring Trustee and shall duly assign,
transfer and deliver to such successor Trustee all property and money held by
such retiring Trustee hereunder.  Any Trustee ceasing to act shall,
nevertheless, retain a prior lien upon all property or funds held or collected
by such Trustee to secure any amounts then due it pursuant to the provisions of
Section 607.

         (b)     In case of the appointment hereunder of a successor Trustee
with respect to the Securities of one or more (but not all) series, the
Company, the retiring Trustee and each successor Trustee with respect to the
Securities of one or more series shall execute and deliver an indenture
supplemental hereto wherein each successor Trustee shall accept such
appointment and which (1) shall contain such provisions as shall be necessary
or desirable to transfer and confirm to, and to vest in, each successor Trustee
all the rights, powers, trusts and duties of the retiring Trustee with respect
to the Securities of that or those series to which the appointment of such
successor Trustee relates, (2) if the retiring Trustee is not retiring with
respect to all Securities, shall contain such provisions as shall be deemed
necessary or desirable to confirm that all the rights, powers, trusts and
duties of the retiring Trustee with respect to the Securities of that or those
series as to which the retiring Trustee is not retiring shall continue to be
vested in the retiring Trustee, and (3) shall add to or change any of the
provisions of this Indenture as shall be necessary to provide for or facilitate
the administration of the trusts hereunder by more than one Trustee, it being
understood that nothing herein or in such supplemental indenture shall
constitute such Trustees as co-trustees of the same trust and that each such
Trustee shall be trustee of a trust or trusts hereunder separate and apart from
any trust or trusts hereunder administered by any other such Trustee; and upon
the execution and delivery of such supplemental indenture the resignation or
removal of the retiring Trustee shall become effective to the extent provided
therein and each such successor Trustee, without any further act, deed or
conveyance, shall become vested with all rights, powers, trusts and duties of
the retiring Trustee with respect to the Securities of that or those series to
which the appointment of such successor Trustee relates; but, on request of the
Company or any successor Trustee, such retiring





                                      -43-
<PAGE>   50
Trustee shall duly assign, transfer and deliver to such successor Trustee all
property and money held by such retiring Trustee hereunder with respect to the
Securities of that or those series to which the appointment of such successor
Trustee relates.

         (c)     Upon request of any successor Trustee, the Company shall
execute any and all instruments for more fully and certainly vesting in and
confirming to such successor Trustee all such rights, powers and trusts
referred to in paragraph (a) or (b) of this Section, as the case may be.

         (d)     No successor Trustee shall accept its appointment unless at
the time of such acceptance such successor Trustee shall be qualified and
eligible under this Article.

SECTION 612.  Merger, Conversion, Consolidation or Succession to Business.

         Any corporation into which the Trustee may be merged or converted or
with which it may be consolidated, or any corporation resulting from any
merger, conversion or consolidation to which the Trustee shall be a party, or
any corporation succeeding to all or substantially all the corporate trust
business of the Trustee, shall be the successor of the Trustee hereunder,
provided such corporation shall be otherwise qualified and eligible under this
Article, without the execution or filing of any paper or any further act on the
part of any of the parties hereto.  In case any Securities shall have been
authenticated, but not delivered, by the Trustee then in office, any successor
by merger, conversion or consolidation to such authenticating Trustee may adopt
such authentication and deliver the Securities so authenticated with the same
effect as if such successor Trustee had itself authenticated such Securities.
As soon as practicable, the successor Trustee shall mail a notice of its
succession to the Company and the Holders of all Outstanding Securities

SECTION 613.  Preferential Collection of Claims Against Company.

         If and when the Trustee shall be or become a creditor of the Company
(or any other obligor upon the Securities), the Trustee shall be subject to the
provisions of the Trust Indenture Act regarding the collection of claims
against the Company (or any such other obligor).

SECTION 614.  Appointment of Authenticating Agent.

         The Trustee may, by an instrument in writing, appoint an
Authenticating Agent or Agents with respect to one or more series of Securities
which may be authorized to act on behalf of the Trustee to authenticate
Securities of such series issued upon original issue or upon exchange,
registration of transfer or partial redemption thereof or pursuant to Section
306, and Securities so authenticated shall be entitled to the benefits of this
Indenture and shall be valid and obligatory for all purposes as if
authenticated by the Trustee hereunder.  Wherever reference is made in this
Indenture to the authentication and delivery of Securities by the Trustee or
the Trustee's certificate of authentication, such reference shall be deemed to
include authentication and delivery on behalf of the Trustee by an
Authenticating Agent.  Each Authenticating Agent shall be acceptable to the
Company and shall at all times be a bank or trust company organized and doing
business under the laws of the United States of America, any State thereof or
the District of Columbia (or, if Bearer Securities, organized and doing
business under the laws of the country in which the Bearer Securities





                                      -44-
<PAGE>   51
are eligible), authorized under such laws to act as Authenticating Agent,
having a combined capital and surplus of not less than $50,000,000 and subject
to supervision or examination by Federal or State authority (or, if Bearer
Securities, an authority of the country in which the Bearer Securities are
eligible).  If such Authenticating Agent publishes reports of condition at
least annually, pursuant to law or to the requirements of said supervising or
examining authority, then for the purposes of this Section, the combined
capital and surplus of such Authenticating Agent shall be deemed to be its
combined capital and surplus as set forth in its most recent report of
condition so published.  If at any time an Authenticating Agent shall cease to
be eligible in accordance with the provisions of this Section, such
Authenticating Agent shall resign immediately in the manner and with the effect
specified in this Section.

         Any corporation into which an Authenticating Agent may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, conversion or consolidation to which such Authenticating Agent
shall be a party, or any corporation succeeding to the corporate agency or
corporate trust business of such Authenticating Agent, shall continue to be an
Authenticating Agent, provided such corporation shall be otherwise eligible
under this Section, without the execution or filing of any paper or any further
act on the part of the Trustee or such Authenticating Agent.

         An Authenticating Agent may, and if it shall cease to be eligible
shall, resign at any time by giving written notice thereof to the Trustee and
to the Company.  The Trustee may at any time terminate the agency of an
Authenticating Agent by giving written notice thereof to such Authenticating
Agent and to the Company.  Upon receiving such notice of resignation or upon
such termination, or in case at any time such Authenticating Agent shall cease
to be eligible in accordance with the provisions of this Section, the Trustee
may appoint a successor Authenticating Agent which shall be acceptable to the
Company and shall mail written notice of such appointment by first-class mail,
postage prepaid, to all Holders of Registered Securities, if any, of the series
with respect to which such Authenticating Agent will serve, as their names and
addresses appear in the Security Register.  Any successor Authenticating Agent
upon acceptance of its appointment hereunder shall become vested with all the
rights, powers, and duties of its predecessor hereunder, with like effect as if
originally named as an Authenticating Agent.  No successor Authenticating Agent
shall be appointed unless eligible under the provisions of this Section.

         The Trustee agrees to pay to each Authenticating Agent from time to
time reasonable compensation for its services under this Section, and the
Trustee shall be entitled to be reimbursed for such payment, subject to the
provisions of Section 607.

         If an appointment with respect to one or more series is made pursuant
to this Section, the Securities of such series may have been endorsed thereon,
in addition to the Trustee's certificate of authentication, an alternative
certificate of authentication in the following form:

                 "This is one of the Securities of the series designated
         therein referred to in the within-mentioned Indenture.





                                      -45-
<PAGE>   52
                                 Chase Bank of Texas, National Association
                                         As Trustee

                                 By:
                                    -----------------------------------
                                         As Authenticating Agent

                                 By:
                                    -----------------------------------
                                          Authorized Signatory"


         If all the Securities of a series may not be originally issued at one
time, and if the Company has an Affiliate eligible to be appointed as an
Authenticating Agent hereunder or the Trustee does not have an office capable
of authenticating Securities upon original issuance located in a Place of
Payment where the Company wishes to have Securities of such series
authenticated upon original issuance, the Trustee, if so requested by the
Company in writing (which writing need not comply with Section 102 and need not
be accompanied by an Opinion of Counsel), shall appoint in accordance with this
Section an Authenticating Agent (which, if so requested by the Company, shall
be such Affiliate of the Company) having an office in a Place of Payment
designated by the Company with respect to such series of Securities.

                                 ARTICLE SEVEN
               HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY

SECTION 701.  Company to Furnish Trustee Names and Addresses of Holders.

         With respect to each series of Securities, the Company will furnish or
cause to be furnished to the Trustee:

         (a)     semi-annually, not later than 15 days after a Regular Record
Date, a list, in such form as the Trustee may reasonably require, containing
all the information in the possession or control of the Company, or any of its
Paying Agents other than the Trustee, as to the names and addresses of the
Holders of Securities as of the immediately preceding Regular Record Date, and

         (b)     at such other times as the Trustee may request in writing,
within 30 days after the receipt by the Company of any such request, a list of
similar form and content as of a date not more than 15 days prior to the time
such list is furnished;

excluding from any such list names and addresses received by the Trustee in its
capacity as Security Registrar.

SECTION 702.  Preservation of Information;  Communications to Holders.

         (a)     The Trustee shall preserve, in as current a form as is
reasonably practicable, the names and addresses of Holders contained in the
most recent list furnished to the Trustee as provided in Section 701, and the
names and addresses of Holders received by the Trustee in its capacity as





                                      -46-
<PAGE>   53
Security Registrar.  The Trustee may destroy any list furnished to it as
provided in Section 701 upon receipt of a new list so furnished.

         (b)     The rights of the Holders to communicate with other Holders
with respect to their rights under this Indenture or under the Securities, and
the corresponding rights and privileges of the Trustee, shall be as provided by
the Trust Indenture Act.

         (c)     Every Holder of Securities or coupons, by receiving and
holding the same, agrees with the Company, each Subsidiary Guarantor  and the
Trustee that neither the Company, any Subsidiary Guarantor nor the Trustee nor
any agent of any of them shall be held accountable by reason of any disclosure
of information as to names and addresses of Holders made pursuant to the Trust
Indenture Act and that the Trustee shall not be held accountable by reason of
mailing any material pursuant to a request made under Section 702(b).

SECTION 703.  Reports by Trustee.

         (a)     On or before August 1 in each year following the date hereof,
the Trustee shall transmit to Holders such reports concerning the Trustee and
its actions under this Indenture as may be required pursuant to the Trust
Indenture Act at the times and in the manner provided pursuant thereto.

         (b)     A copy of each such report shall, at the time of such
transmission to Holders, be filed by the Trustee with each stock exchange upon
which any Securities are listed, with the Commission and with the Company.  The
Company will notify the Trustee when any Securities are listed on any stock
exchange.

SECTION 704.  Reports by Company.

         In addition to the certificates delivered to the Trustee pursuant to
Section 1006, the Company shall file with the Trustee and the Commission, and
transmit to Holders, such information, documents and other reports, and such
summaries thereof, as may be required pursuant to the Trust Indenture Act at
the times and in the manner provided pursuant to such Act; provided, however,
that any such information, documents or reports required to be filed with the
Commission pursuant to Section 13 or 15(d) of the Securities Exchange Act of
1934, shall be filed with the Trustee within 15 days after the same is so
required to be filed with the Commission.


                                 ARTICLE EIGHT
              CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

SECTION 801.  Company May Consolidate, Etc., Only on Certain Terms.

         The Company shall not consolidate with or merge into any other Person
or convey, transfer or lease its properties and assets substantially as an
entirety to any Person, unless:





                                      -47-
<PAGE>   54
                 (1)      the Person formed by such consolidation or into which
         the Company is merged or the Person which acquires by conveyance or
         transfer, or which leases, the properties and assets of the Company
         substantially as an entirety shall be a corporation, partnership or
         trust, shall be organized and validly existing under the laws of the
         United States of America, any State thereof or the District of
         Columbia and shall expressly assume, by an indenture supplemental
         hereto, executed and delivered to the Trustee, in form satisfactory to
         the Trustee, the due and punctual payment of the principal of and any
         premium and interest (including all additional amounts, if any,
         payable pursuant to Section 1004) on all the Securities and the
         performance or observance of every other covenant of this Indenture on
         the part of the Company to be performed or observed;

                 (2)      immediately after giving effect to such transaction
         and treating any indebtedness which becomes an obligation of the
         Company or a Subsidiary as a result of such transaction as having been
         incurred by the Company or such Subsidiary at the time of such
         transaction, no Event of Default, and no event which, after notice or
         lapse of time or both, would become an Event of Default, shall have
         happened and be continuing; and

                 (3)      the Company has delivered to the Trustee an Officers'
         Certificate and an Opinion of Counsel, each stating that such
         consolidation, merger, conveyance, transfer or lease and such
         supplemental indenture comply with this Article and that all
         conditions precedent herein provided for relating to such transaction
         have been complied with.

SECTION 802.  Successor Substituted.

         Upon any consolidation of the Company with, or merger of the Company
into, any other Person or any conveyance, transfer or lease of the properties
and assets of the Company substantially as an entirety in accordance with
Section 801, the successor Person formed by such consolidation or into which
the Company is merged or to which such conveyance, transfer or lease is made
shall succeed to, and be substituted for, and may exercise every right and
power of, the Company under this Indenture with the same effect as if such
successor Person had been named as the Company herein, and thereafter, except
in the case of a lease, the predecessor Person shall be relieved of all
obligations and covenants under this Indenture and the Securities and coupons
and may liquidate and dissolve.

                                  ARTICLE NINE
                            SUPPLEMENTAL INDENTURES

SECTION 901.  Supplemental Indentures without Consent of Holders.

         Without the consent of any Holders of Securities or coupons, the
Company, when authorized by a Board Resolution, each Subsidiary Guarantor, when
authorized by a Board Resolution, and the Trustee, at any time and from time to
time, may enter into one or more indentures supplemental hereto, in form
satisfactory to the Trustee, for any of the following purposes:





                                      -48-
<PAGE>   55
                 (1)      to evidence the succession of another Person to the
         Company and the assumption by any such successor of the covenants of
         the Company herein and in the Securities pursuant to Article Eight; or

                 (2)      to add to the covenants of the Company for the
         benefit of the Holders of all or any series of Securities (and if such
         covenants are to be for the benefit of less than all series of
         Securities, stating that such covenants are expressly being included
         solely for the benefit of such series) or to surrender any right or
         power herein conferred upon the Company; or

                 (3)      to add any additional Events of Default; or

                 (4)      to add to or change any of the provisions of this
         Indenture to provide that Bearer Securities may be registrable as to
         principal, to change or eliminate any restrictions on the payment of
         principal of or any premium or interest on Bearer Securities, to
         permit Bearer Securities to be issued in exchange for Registered
         Securities, to permit Bearer Securities to be issued in exchange for
         Bearer Securities of other authorized denominations or to permit or
         facilitate the issuance of Securities in uncertificated form, provided
         that any such action shall not adversely affect the interests of the
         Holders of Securities of any series or any related coupons in any
         material respect; or

                 (5)      to add to, change or eliminate any of the provisions
         of this Indenture in respect of one or more series of Securities,
         provided that any such addition, change or elimination (A) shall
         neither (i) apply to any Security of any series created prior to the
         execution of such supplemental indenture and entitled to the benefit
         of such provision nor (ii) modify the rights of the Holder of any such
         Security with respect to such provision or (B) shall become effective
         only when there is no such Security Outstanding; or

                 (6)      to secure the Securities or any Subsidiary Guarantee
         pursuant to the terms thereof or to release a Subsidiary Guarantor
         from its obligations under this Indenture and its Subsidiary Guarantee
         in accordance with the provisions hereof and thereof; or

                 (7)      to establish the form or terms of Securities of any
         series and any related coupons as permitted by Sections 201 and 301;
         or

                 (8)      to evidence and provide for the acceptance of
         appointment hereunder by a successor Trustee with respect to the
         Securities of one or more series and to add to or change any of the
         provisions of this Indenture as shall be necessary to provide for or
         facilitate the administration of the trusts hereunder by more than one
         Trustee, pursuant to the requirements of Section 611(b); or

                 (9)      to cure any ambiguity, to correct or supplement any
         provision herein or in any supplemental indenture which may be
         defective or inconsistent with any other provision herein or in any
         supplemental indenture, or to make any other provisions with respect
         to matters or questions arising under this Indenture; provided, that
         such action shall not





                                      -49-
<PAGE>   56
         adversely affect the interests of the Holders of Securities of any
         series or any related coupons in any material respect.

SECTION 902.  Supplemental Indentures with Consent of Holders.

         With the consent of the Holders of a majority in principal amount of
the Outstanding  Securities of each series affected by such supplemental
indenture, by Act of said Holders delivered to the Company and the Trustee, the
Company, when authorized by a Board Resolution, each Subsidiary Guarantor, when
authorized by a Board Resolution, and the Trustee may enter into an indenture
or indentures supplemental hereto for the purpose of adding any provisions to
or changing in any manner or eliminating any of the provisions of this
Indenture or of modifying in any manner the rights of the Holders of Securities
of such series and any related coupons under this Indenture; provided, however,
that no such supplemental indenture shall, without the consent of the Holder of
each Outstanding Security affected thereby,

                 (1)      change the Stated Maturity of the principal of, or
         any installment of principal of or interest on, any Security, or
         reduce the principal amount thereof or the rate of interest thereon or
         any premium payable upon the redemption thereof, or change the
         Redemption Date thereof, or change any obligation of the Company to
         pay additional amounts pursuant to Section 1004 (except as
         contemplated by Section 801(1) and permitted by Section 901(1)), or
         reduce the amount of the principal of an Original Issue Discount
         Security that would be due and payable upon a declaration of
         acceleration of the Maturity thereof pursuant to Section 502 or change
         the coin or currency in which any Security or any premium or interest
         thereon is payable, or change any right of redemption, purchase or
         repayment by the Company at the option of the Holder, or impair the
         right to institute suit for the enforcement of any such payment on or
         after the Stated Maturity thereof (or, in the case of redemption, on
         or after the Redemption Date), or

                 (2)      reduce the percentage in principal amount of the
         Outstanding Securities of any series, the consent of whose Holders is
         required for any such supplemental indenture, or the consent of whose
         Holders is required for any waiver (of compliance with certain
         provisions of this Indenture or certain defaults hereunder and their
         consequences) provided for in this Indenture, or reduce the
         requirements of Section 1404 for quorum or voting, or

                 (3)      change any obligation of the Company to maintain an
         office or agency in the places and for the purposes specified in
         Section 1002, or

                 (4)      modify any of the provisions of this Section, Section
         513 or Section 1007 except to increase any such percentage or to
         provide that certain other provisions of this Indenture cannot be
         modified or waived without the consent of the Holder of each
         Outstanding Security affected thereby; provided, however, that this
         clause shall not be deemed to require the consent of any Holder of a
         Security or coupon with respect to changes in the references to "the
         Trustee" and concomitant changes in this Section and Section 1007 or
         the deletion of this provision, in accordance with the requirements of
         Sections 611(b) and 901(8).





                                      -50-
<PAGE>   57
A supplemental indenture which changes or eliminates any covenant or other
provision of this Indenture which has expressly been included solely for the
benefit of one or more particular series of Securities, or which modifies the
rights of the Holders of Securities of such series with respect to such
covenant or other provision, shall be deemed not to affect the rights under
this Indenture of the Holders of Securities of any other series.

         It shall not be necessary for any Act of Holders of Securities under
this Section to approve the particular form of any proposed supplemental
indenture, but it shall be sufficient if such Act shall approve the substance
thereof.

SECTION 903.  Execution of Supplemental Indentures.

         In executing, or accepting the additional trusts created by, any
supplemental indenture permitted by this Article or the modifications thereby
of the trusts created by this Indenture, the Trustee shall be entitled to
receive and (subject to Section 601) shall be fully protected in relying upon,
an Opinion of Counsel stating that the execution of such supplemental indenture
is authorized or permitted by this Indenture.  The Trustee may, but shall not
be obligated to, enter into any such supplemental indenture which affects the
Trustee's own rights, duties or immunities under this Indenture or otherwise.

SECTION 904.  Effect of Supplemental Indentures.

         Upon the execution of any supplemental indenture under this Article,
this Indenture shall be modified in accordance therewith, and such supplemental
indenture shall form a part of this Indenture for all purposes; and every
Holder of Securities theretofore or thereafter authenticated and delivered
hereunder and of any coupons appertaining thereto shall be bound thereby.

SECTION 905.  Conformity with Trust Indenture Act.

         Every supplemental indenture executed pursuant to this Article shall
conform to the requirements of the Trust Indenture Act as then in effect.

SECTION 906.  Reference in Securities to Supplemental Indentures.

         Securities of any series authenticated and delivered after the
execution of any supplemental indenture pursuant to this Article may, and shall
if required by the Trustee, bear a notation in form approved by the Trustee as
to any matter provided for in such supplemental indenture.  If the Company
shall so determine, new Securities of any series so modified as to conform, in
the opinion of the Trustee and the Company, to any such supplemental indenture
may be prepared and executed by the Company and authenticated and delivered by
the Trustee in exchange for Outstanding Securities of such series and of like
tenor.





                                      -51-
<PAGE>   58
                                  ARTICLE TEN
                                   COVENANTS

SECTION 1001.  Payment of Principal, Premium and Interest.

         The Company covenants and agrees for the benefit of each series of
Securities that it will duly and punctually pay the principal of and any
premium and interest on the Securities of that series in accordance with the
terms of the Securities, any coupons appertaining thereto and this Indenture.
Any such payment shall be considered duly paid on the date due if, on or before
10:30 a.m., Houston, Texas time on such date, the Trustee (or a Paying Agent
other than the Company or an Affiliate thereof) holds in accordance with this
Indenture money sufficient to pay all principal, premium and interest then due
and the Trustee or the Paying Agent, as the case may be, is not prohibited from
paying such money to the holders of Securities on that date pursuant to the
terms of the Indenture.  Unless otherwise specified as contemplated by Section
301 with respect to any series of Securities, any interest due on Bearer
Securities on or before Maturity shall be payable only upon presentation and
surrender of the several coupons for such interest installments as are
evidenced thereby as they severally mature.

SECTION 1002.  Maintenance of Office or Agency.

         If Securities of a series are issuable only as Registered Securities,
the Company will maintain in each Place of Payment for such series an office or
agency where Securities of that series may be presented or surrendered for
payment, where Securities of that series may be surrendered for registration of
transfer or exchange and where notices and demands to or upon the Company in
respect of the Securities of that series and this Indenture may be served.  If
Securities of a series are issuable as Bearer Securities, the Company will
maintain (A) in the Borough of Manhattan, The City of New York, an office or
agency where any Registered Securities of that series may be presented or
surrendered for payment, where any Registered Securities of that series may be
surrendered for registration of transfer, where Securities of that series may
be surrendered for exchange, where notices and demands to or upon the Company
in respect of the Securities of that series and this Indenture may be served
and where Bearer Securities of that series and related coupons may be presented
or surrendered for payment in the circumstances described in the following
paragraph (and not otherwise), (B) subject to any laws or regulations
applicable thereto, in a Place of Payment for that series which is located
outside the United States, an office or agency where Securities of that series
and related coupons may be presented and surrendered for payment (including
payment of any additional amounts payable on Securities of that series pursuant
to Section 1004); provided, however, that if the Securities of that series are
listed on The International Stock Exchange of the United Kingdom and the
Republic of Ireland Limited, the Luxembourg Stock Exchange or any other stock
exchange located outside the United States and such stock exchange shall so
require, the Company will maintain a Paying Agent for the Securities of that
series in London, Luxembourg or any other required city located outside the
United States, as the case may be, so long as the Securities of that series are
listed on such exchange, and (C) subject to any laws or regulations applicable
thereto, in a Place of Payment for that series located outside the United
States an office or agency where any Registered Securities of that series may
be surrendered for registration of transfer, where Securities of that series
may be surrendered for exchange and where notices and demands to or upon the





                                      -52-
<PAGE>   59
Company in respect of the Securities of that series and this Indenture may be
served.  The Company will give prompt written notice to the Trustee and prompt
notices to the Holders as provided in Section 106 of the location, and any
change in the location, of any such office or agency.  If at any time the
Company shall fail to maintain any such required office or agency in respect of
any series of Securities or shall fail to furnish the Trustee with the address
thereof, such presentations and surrenders of Securities of that series may be
made and notices and demands may be made or served at the Corporate Trust
Office of the Trustee, except that Bearer Securities of that series and the
related coupons may be presented and surrendered for payment (including payment
of any additional amounts payable on Bearer Securities of that series pursuant
to Section 1004) at any Paying Agent for such series located outside the United
States, and the Company hereby appoints the same as its agents to receive such
respective presentations, surrenders, notices and demands.

         No payment of principal, premium or interest on Bearer Securities
shall be made at any office or agency of the Company in the United States or by
check mailed to any address in the United States or by transfer to an account
maintained with a bank located in the United States; provided, however, that,
if the Securities of a series are denominated and payable in Dollars payment of
principal of and any premium and interest on any Bearer Security (including any
additional amounts payable on Securities of such series pursuant to Section
1004) shall be made at the office of the Company's Paying Agent in the Borough
of Manhattan, The City of New York, if (but only if) payment in Dollars of the
full amount of such principal, premium, interest or additional amounts, as the
case may be, at all offices or agencies outside the United States maintained
for the purpose by the Company in accordance with this Indenture is illegal or
effectively precluded by exchange controls or other similar restrictions.

         The Company may also from time to time designate one or more other
offices or agencies where Securities of one or more series may be presented or
surrendered for any or all such purposes and may from time to time rescind such
designations; provided, however, that no such designation or rescission shall
in any manner relieve the Company of its obligation to so maintain an office or
agency in accordance with the requirements set forth above for Securities of
any series for such purposes.  The Company will give prompt written notice to
the Trustee and the Holders of any such designation or rescission and of any
other change in the location of any such other office or agency.

SECTION 1003.  Money for Securities Payments to Be Held in Trust.

         If the Company shall at any time act as its own Paying Agent with
respect to any series of Securities, it will, on or before each due date of the
principal of and any premium or interest on any of the Securities of that
series, segregate and hold in trust for the benefit of the Persons entitled
thereto a sum sufficient to pay the principal and any premium or interest so
becoming due until such sums shall be paid to such Persons or otherwise
disposed of as herein provided and will promptly notify the Trustee of its
action or failure to so act.

         Whenever the Company shall have one or more Paying Agents for any
series of Securities, it will, on or prior to each due date of the principal of
and any premium or interest on any Securities of that series, deposit with a
Paying Agent a sum sufficient to pay the principal and any premium or interest
so becoming due, such sum to be held in trust for the benefit of the Persons
entitled to such





                                      -53-
<PAGE>   60
principal, premium or interest, and (unless such Paying Agent is the Trustee)
the Company will promptly notify the Trustee of its action or failure to so
act.

         The Company will cause each Paying Agent for any series of Securities
(other than the Company or the Trustee) to execute and deliver to the Trustee
an instrument in which such Paying Agent shall agree with the Trustee, subject
to the provisions of this Section, that such Paying Agent will (i) comply with
the provisions of the Trust Indenture Act applicable to it as a Paying Agent
and (ii) during the continuance of any default by the Company (or any other
obligor upon the Securities of that series) in the making of any payment in
respect of the Securities of that series, and upon the written request of the
Trustee, forthwith pay to the Trustee all sums held in trust by such Paying
Agent for payment in respect of the Securities of that series.

         The Company may at any time, for the purpose of obtaining the
satisfaction and discharge of this Indenture or for any other purpose, pay, or
by Company Order direct any Paying Agent to pay, to the Trustee all sums held
in trust by the Company or such Paying Agent, such sums to be held by the
Trustee upon the same trusts as those upon which such sums were held by the
Company or such Paying Agent; and, upon such payment by any Paying Agent to the
Trustee, such Paying Agent shall be released from all further liability with
respect to such money.

         Any money deposited with the Trustee or any Paying Agent, or then held
by the Company, in trust for the payment of the principal of and any premium or
interest on any Security of any series and remaining unclaimed for two years
after such principal and any premium or interest has become due and payable
shall be paid to the Company on Company Request (unless otherwise required by
mandatory provisions of applicable escheat or abandoned or unclaimed property
law), or (if then held by the Company) shall be discharged from such trust; and
the Holder of such Security or any coupon appertaining thereto shall (unless
otherwise required by mandatory provisions of applicable escheat or abandoned
or unclaimed property law) thereafter, as an unsecured general creditor, look
only to the Company for payment thereof, and all liability of the Trustee or
such Paying Agent with respect to such trust money, and all liability of the
Company as trustee thereof, shall thereupon cease; provided, however, that the
Trustee or such Paying Agent, before being required to make any such repayment,
may at the expense of the Company cause to be published once, in an Authorized
Newspaper in each Place of Payment, notice that such money remains unclaimed
and that, after a date specified therein, which shall not be less than 30 days
from the date of such publication, any unclaimed balance of such money then
remaining will be repaid to the Company.

SECTION 1004.  Additional Amounts.

         If the Securities of a series provide for the payment of additional
amounts, the Company will pay to the Holder of any Security of such series or
any coupon appertaining thereto additional amounts as provided therein.
Whenever in this Indenture there is mentioned, in any context, the payment of
the principal of or any premium or interest on, or in respect of, any Security
of any series or payment of any related coupon or the net proceeds received on
the sale or exchange of any Security of any series, such mention shall be
deemed to include mention of the payment of additional amounts provided for in
this Section to the extent that, in such context, additional amounts are, were
or would be payable in respect thereof pursuant to the provisions of this
Section and express mention





                                      -54-
<PAGE>   61
of the payment of additional amounts (if applicable) in any provisions hereof
shall not be construed as excluding additional amounts in those provisions
hereof where such express mention is not made.

         If the Securities of a series provide for the payment of additional
amounts, at least 10 days prior to the first Interest Payment Date with respect
to that series of Securities (or if the Securities of that series will not bear
interest prior to Maturity, the first day on which a payment of principal and
any premium is made), and at least 10 days prior to each date of payment of
principal and any premium or interest if there has been any change with respect
to the matters set forth in the below-mentioned Officers' Certificate, the
Company will furnish the Trustee and the Company's principal Paying Agent or
Paying Agents, if other than the Trustee, with an Officers' Certificate
instructing the Trustee and such Paying Agent or Paying Agents whether such
payment of principal of and any premium or interest on the Securities of that
series shall be made to Holders of Securities of that series or any related
coupons who are United States Aliens without withholding for or on account of
any tax, assessment or other governmental charge described in the Securities of
that series.  If any such withholding shall be required, then such Officers'
Certificate shall specify by country the amount, if any, required to be
withheld on such payments to such Holders of Securities or coupons and the
Company will pay to the Trustee or such Paying Agent the additional amounts
required by this Section.  The Company covenants to indemnify the Trustee and
any Paying Agent for, and to hold them harmless against, any loss, liability or
expense reasonably incurred without negligence or bad faith on their part
arising out of or in connection with actions taken or omitted by any of them in
reliance on any Officers' Certificate furnished pursuant to this Section.

SECTION 1005.  Purchase of Securities by Company or Subsidiary.

         If and so long as the Securities of a series are listed on The
International Stock Exchange of the United Kingdom and the Republic of Ireland
Limited and such stock exchange shall so require, the Company will not, and
will not permit any of its Subsidiaries to, purchase any Securities of that
series by private treaty at a price (exclusive of expenses and accrued
interest) which exceeds 120% of the mean of the nominal quotations of the
Securities of that series as shown in The Stock Exchange Daily Official List
for the last trading day preceding the date of purchase.

SECTION 1006.  Statement by Officer as to Default.

         The Company will deliver to the Trustee, within 120 days after the end
of each fiscal year of the Company ending after the date hereof, a brief
certificate from the principal executive officer, principal financial officer
or principal accounting officer as to his or her knowledge of the Company's
compliance with all conditions and covenants under this Indenture.  For
purposes of this Section 1006, such compliance shall be determined without
regard to any period of grace or requirement of notice under this Indenture.

SECTION 1007.  Waiver of Certain Covenants.

         The Company may omit in any particular instance to comply with any
term, provision or condition set forth in (i) Section 1005 with respect to the
Securities of any series or (ii) any covenant of the Company added to this
Indenture pursuant to clause (17) of Section 301 for the benefit of the





                                      -55-
<PAGE>   62
Holders of such series, if before the time for such compliance the Holders of a
majority in principal amount of the Outstanding Securities of such series
shall, by Act of such Holders, either waive such compliance in such instance or
generally waive compliance with such term, provision or condition, but no such
waiver shall extend to or affect such term, provision or condition except to
the extent so expressly waived, and, until such waiver shall become effective,
the obligations of the Company and the duties of the Trustee in respect of any
such term, provision or condition shall remain in full force and effect.

                                 ARTICLE ELEVEN
                            REDEMPTION OF SECURITIES

SECTION 1101.  Applicability of Article.

         Securities of any series which are redeemable before their Stated
Maturity shall be redeemable in accordance with their terms and (except as
otherwise specified as contemplated by Section 301 for Securities of any
series) in accordance with this Article.

SECTION 1102.  Election to Redeem; Notice to Trustee.

         The election of the Company to redeem any Securities shall be
evidenced by a Board Resolution.  In the case of any redemption at the election
of the Company of less than all the Securities of any series, the Company
shall, at least 45 days prior to the Redemption Date fixed by the Company
(unless a shorter notice shall be satisfactory to the Trustee), notify the
Trustee of such Redemption Date, of the principal amount of Securities of such
series to be redeemed and, if applicable, of the tenor of the Securities of
such series to be redeemed.  In the case of any redemption of Securities (i)
prior to the expiration of any restriction on such redemption provided in the
terms of such Securities or elsewhere in this Indenture, or (ii) pursuant to an
election of the Company which is subject to a condition specified in the terms
of such Securities, the Company shall furnish the Trustee with an Officers'
Certificate evidencing compliance with such restriction or condition.

SECTION 1103.  Selection of Securities to Be Redeemed.

         If less than all the Securities of any series are to be redeemed
(unless all of the Securities of such series of a specified tenor are to be
redeemed) the particular Securities to be redeemed shall be selected not more
than 45 days prior to the Redemption Date by the Company or the Trustee, from
the Outstanding Securities of such series not previously called for redemption,
by such method as the Company or the Trustee shall deem fair and appropriate
and which may provide for the selection for redemption of portions (equal to
the minimum authorized denomination for Securities of that series or any
integral multiple thereof) of the principal amount of Registered Securities of
such series of a denomination larger than the minimum authorized denomination
for Securities of that series or of the principal amount of global Securities
of such series.  If less than all of the Securities of such series and of a
specified tenor are to be redeemed, the particular Securities to be redeemed
shall be selected not more than 45 days prior to the Redemption Date by the
Company or the Trustee, from the Outstanding Securities of such series and
specified tenor not previously called for redemption in accordance with the
preceding sentence.





                                      -56-
<PAGE>   63
         The Company or the Trustee, as the case may be, shall promptly notify
the other in writing of the Securities selected for redemption and, in the case
of any Securities selected for partial redemption, the principal amount thereof
to be redeemed.

         For all purposes of this Indenture, unless the context otherwise
requires, all provisions relating to the redemption of Securities shall relate,
in the case of any Securities redeemed or to be redeemed only in part, to the
portion of the principal amount of such Securities which has been or is to be
redeemed.

SECTION 1104.  Notice of Redemption.

         Notice of redemption shall be given in the manner provided in Section
106 to the Holders of Securities to be redeemed not less than 30 nor more than
45 days prior to the Redemption Date.

         All notices of redemption shall state:

                 (1)      the Redemption Date,

                 (2)      the Redemption Price,

                 (3)      if less than all the Outstanding Securities of any
         series are to be redeemed, the identification (and, in the case of
         partial redemption of any Securities, the principal amounts) of the
         particular Securities to be redeemed, and that on and after the
         Redemption Date, upon surrender of the Securities, new Securities of
         such series in principal amount equal to the unredeemed part thereof
         will be issued,

                 (4)      that on the Redemption Date the Redemption Price will
         become due and payable upon each such Security to be redeemed and, if
         applicable, that interest thereon will cease to accrue on and after
         said date,

                 (5)      the place or places where such Securities, together
         in the case of Bearer Securities with all coupons appertaining
         thereto, if any, maturing after the Redemption Date, are to be
         surrendered for payment of the Redemption Price, and

                 (6)      that the redemption is for a sinking fund, if such is
         the case.

A notice of redemption published as contemplated by Section 106 need not
identify particular Registered Securities to be redeemed.

         If any of the Securities to be redeemed is in the form of a Book-Entry
Security, then the Company shall modify the notice of redemption to the extent
necessary to accord with the procedures of the Depository applicable to
redemption.





                                      -57-
<PAGE>   64
         Notice of redemption of Securities to be redeemed at the election of
the Company shall be given by the Company or, at the Company's request, by the
Trustee in the name and at the expense of the Company.

SECTION 1105.  Deposit of Redemption Price.

         On or prior to any Redemption Date, the Company shall deposit with the
Trustee or with a Paying Agent (or, if the Company is acting as its own Paying
Agent, segregate and hold in trust as provided in Section 1003) an amount of
money sufficient to pay the Redemption Price of, and (except if the Redemption
Date shall be an Interest Payment Date) accrued interest on, all the Securities
which are to be redeemed on that date.

SECTION 1106.  Securities Payable on Redemption Date.

         Notice of redemption having been given as aforesaid, the Securities so
to be redeemed shall, on the Redemption Date, become due and payable at the
Redemption Price therein specified, and from and after such date (unless the
Company shall default in the payment of the Redemption Price and accrued
interest) such Securities shall cease to bear interest and the coupons for such
interest appertaining to any Bearer Securities so to be redeemed, except to the
extent provided below, shall be void.  Upon surrender of any such Security for
redemption in accordance with said notice, together with all coupons, if any,
appertaining thereto maturing after the Redemption Date, such Security shall be
paid by the Company at the Redemption Price, together with accrued interest to
the Redemption Date; provided, however, that installments of interest on Bearer
Securities whose Stated Maturity is on or prior to the Redemption Date shall be
payable only at an office or agency located outside the United States (except
as otherwise provided in Section 1002) and, unless otherwise specified as
contemplated by Section 301, only upon presentation and surrender of coupons
for such interest, and provided, further, that, unless otherwise specified as
contemplated by Section 301, installments of interest on Registered Securities
whose Stated Maturity is on or prior to the Redemption Date shall be payable to
the Holders of such Securities, or one or more Predecessor Securities,
registered as such at the close of business on the relevant Record Dates
according to their terms and the provisions of Section 307.

         If any Bearer Security surrendered for redemption shall not be
accompanied by all appurtenant coupons maturing after the Redemption Date, such
Security may be paid after deducting from the Redemption Price an amount equal
to the face amount of all such missing coupons, or the surrender of such
missing coupon or coupons may be waived by the Company and the Trustee if there
be furnished to them such security or indemnity as they may require to save
each of them and any Paying Agent harmless.  If thereafter the Holder of such
Security shall surrender to the Trustee or any Paying Agent any such missing
coupon in respect of which a deduction shall have been made from the Redemption
Price, such Holder shall be entitled to receive the amount so deducted;
provided, however, that interest represented by coupons shall be payable only
at an office or agency located outside the United States (except as otherwise
provided in Section 1002) and, unless otherwise specified as contemplated by
Section 301, only upon presentation and surrender of those coupons.





                                      -58-
<PAGE>   65
         If any Security called for redemption shall not be so paid upon
surrender thereof for redemption, the principal and any premium shall, until
paid, bear interest from the Redemption Date at the rate prescribed therefor in
the Security.

SECTION 1107.  Securities Redeemed in Part.

         Any Registered Security which is to be redeemed only in part shall be
surrendered at a Place of Payment thereof (with, if the Company or the Trustee
so requires, due endorsement by, or a written instrument of transfer in form
satisfactory to the Company and the Trustee duly executed by, the Holder
thereof or his attorney duly authorized in writing), and the Company shall
execute, and the Trustee shall authenticate and deliver to the Holder of such
Security without service charge, a new Registered Security or Securities of the
same series and of like tenor, of any authorized denomination as requested by
such Holder, in aggregate principal amount equal to and in exchange for the
unredeemed portion of the principal of the Security so surrendered.

                                 ARTICLE TWELVE
                                 SINKING FUNDS

SECTION 1201.  Applicability of Article.

         The provisions of this Article shall be applicable to any sinking fund
for the retirement of Securities of a series except as otherwise specified as
contemplated by Section 301 for Securities of such series.

         The minimum amount of any sinking fund payment provided for by the
terms of Securities of any series is herein referred to as a "mandatory sinking
fund payment", and any payment in excess of such minimum amount provided for by
the terms of Securities of any series is herein referred to as an "optional
sinking fund payment".  If provided for by the terms of Securities of any
series, the cash amount of any sinking fund payment may be subject to reduction
as provided in Section 1202.  Each sinking fund payment shall be applied to the
redemption of Securities of any series as provided for by the terms of
Securities of such series.

SECTION 1202.  Satisfaction of Sinking Fund Payments with Securities.

         The Company (1) may deliver Outstanding Securities of a series (other
than any previously called for redemption), together in the case of any Bearer
Securities of such series with all unmatured coupons appertaining thereto, and
(2) may apply as a credit Securities of a series which have been redeemed
either at the election of the Company pursuant to the terms of such Securities
or through the application of permitted optional sinking fund payments pursuant
to the terms of such Securities, in each case in satisfaction of all or any
part of any sinking fund payment with respect to the Securities of such series
required to be made pursuant to the terms of such Securities as provided for by
the terms of such series, provided that such Securities have not been
previously so credited.  Such Securities shall be received and credited for
such purpose by the Trustee at the Redemption Price specified in such
Securities for redemption through operation of the sinking fund and the amount
of such sinking fund payment shall be reduced accordingly.





                                      -59-
<PAGE>   66
SECTION 1203.  Redemption of Securities for Sinking Fund.

         Not less than 45 days prior to each sinking fund payment date for any
series of Securities, the Company will deliver to the Trustee a Company Order
specifying the amount of the next ensuing sinking fund payment for that series
pursuant to the terms of that series, the portion thereof, if any, which is to
be satisfied by payment of cash and the portion thereof, if any, which is to be
satisfied by delivering and crediting Securities of that series pursuant to
Section 1202 and will also deliver to the Trustee any Securities to be so
credited.  Not less than 30 days before each such sinking fund payment date the
Company or the Trustee shall select the Securities to be redeemed upon such
sinking fund payment date in the manner specified in Section 1103 and cause
notice of the redemption thereof to be given in the name of and at the expense
of the Company in the manner provided in Section 1104.  Such notice having been
duly given, the redemption of such Securities shall be made upon the terms and
in the manner stated in Sections 1106 and 1107.

                                ARTICLE THIRTEEN
                       DEFEASANCE AND COVENANT DEFEASANCE

SECTION 1301.  Company's Option to Effect Defeasance or Covenant Defeasance.

         If so specified in the terms of any series of Securities in accordance
with Section 301, the Company may at its option by Board Resolution, at any
time, elect to have either Section 1302 or Section 1303 applied to the
Outstanding Securities of any series upon compliance with the conditions set
forth below in this Article Thirteen.

SECTION 1302.  Defeasance and Discharge.

         Upon the Company's exercise of the option provided in Section 1301
applicable to this Section, each of the Company and the Subsidiary Guarantors
shall be deemed to have been discharged from its obligations with respect to
the Outstanding Securities of any series on the date the conditions set forth
in Section 1304 are satisfied (hereinafter, "defeasance").  For this purpose,
such defeasance means that the Company shall be deemed to have paid and
discharged the entire indebtedness represented by the Outstanding Securities of
such series and each of the Company and the Subsidiary Guarantors shall be
deemed to have satisfied all its other obligations under the Securities of such
series, any Subsidiary Guarantees thereof and this Indenture insofar as the
Securities of such series are concerned (and the Trustee, at the expense of the
Company, shall execute proper instruments acknowledging the same), except for
the following which shall survive until otherwise terminated or discharged
hereunder:  (A) the rights of Holders of the Securities of such series to
receive, solely from the trust fund described in Section 1304 and as more fully
set forth in such Section, payments in respect of the principal of and any
premium and interest on the Securities of such series when such payments are
due, (B) the Company's obligations with respect to such Securities under
Sections 304, 305, 306, 1002, 1003 and 1004, (C) the rights, powers, trusts,
duties and immunities of the Trustee hereunder and (D) this Article Thirteen.
Subject to compliance with this Article Thirteen, the Company may exercise its
option under this Section 1302 notwithstanding the prior exercise of its option
under Section 1303.





                                      -60-
<PAGE>   67
SECTION 1303.  Covenant Defeasance.

         Upon the Company's exercise of the option provided in Section 1301
applicable to this Section, (i) the Company shall be released from its
obligations with respect to the Securities of such series under Sections 801
and 1005 and any covenant of the Company added to this Indenture pursuant to
clause (17) of Section 301 for the benefit of the Holders of Securities of such
series, and (ii) the occurrence of an event specified in clause (4) of Section
501 (with respect to Sections 801 and 1005 and any such covenant added to this
Indenture pursuant to clause (17) of Section 301 for the benefit of the Holders
of Securities of such series) shall not be deemed to be an Event of Default on
and after the date the conditions set forth in Section 1304 are satisfied
(hereinafter, "covenant defeasance"), but the remainder of this Indenture and
such Securities shall be unaffected thereby.  For this purpose, such covenant
defeasance means that the Company and any Subsidiary Guarantor may omit to
comply with and shall have no liability in respect of any term, condition or
limitation set forth in any such Section, covenant or clause, whether directly
or indirectly, by reason of any reference elsewhere herein to any such Section,
covenant or clause or by reason of any reference in any such Section, covenant
or clause to any other provision herein or in any other document, but the
remainder of this Indenture and such Securities shall be unaffected thereby.

SECTION 1304.  Conditions to Defeasance or Covenant Defeasance.

         The following shall be the conditions to application of either Section
1302 or Section 1303 to the then Outstanding Securities of any series:

                 (1)      The Company shall irrevocably have deposited or
         caused to be deposited with the Trustee (or another trustee satisfying
         the requirements of Section 609 who shall agree to comply with the
         provisions of this Article Thirteen applicable to it) as trust funds
         in trust for the purpose of making the following payments specifically
         pledged as security for, and dedicated solely to, the benefit of the
         Holders of the Securities of such series, (A) money in an amount, or
         (B) U.S. Government Obligations which through the scheduled payment of
         principal and interest in respect thereof in accordance with their
         terms will provide, not later than one day before the due date of any
         payment, money in an amount, or (C) a combination thereof, sufficient,
         in the opinion of a nationally recognized firm of independent public
         accountants expressed in a written certification thereof delivered to
         the Trustee, to pay and discharge, and which shall be applied by the
         Trustee (or other qualifying trustee) to pay and discharge, the
         principal of (and premium, if any) and each installment of interest on
         the Securities and any coupons pertaining thereto on the Stated
         Maturity of such principal (and premium, if any) or installment of
         interest in accordance with the terms of this Indenture and of the
         Securities of such series.  For this purpose, "U.S. Government
         Obligations" means securities that are (x) direct obligations of the
         United States of America for the payment of which its full faith and
         credit is pledged or (y) obligations of a Person controlled or
         supervised by and acting as an agency or instrumentality of the United
         States of America the payment of which is unconditionally guaranteed
         as a full faith and credit obligation by the United States of America,
         which, in either case, are not callable or redeemable at the option of
         the issuer thereof, and shall also include a depository receipt issued
         by a bank (as defined in Section 3(a)(2) of the Securities Act of
         1933), as custodian with respect to any such U.S.





                                      -61-
<PAGE>   68
         Government Obligation or a specific payment of principal of or
         interest on any such U.S. Government Obligation held by such custodian
         for the account of the holder of such depository receipt, provided
         that (except as required by law) such custodian is not authorized to
         make any deduction from the amount payable to the holder of such
         depository receipt from any amount received by the custodian in
         respect of the U.S. Government Obligation or the specific payment of
         principal of or interest on the U.S. Government Obligation evidenced
         by such depository receipt.

                 (2)      In the case of an election under Section 1302, the
         Company shall have delivered to the Trustee an Opinion of Counsel
         stating that (x) the Company has received from, or there has been
         published by, the Internal Revenue Service a ruling, or (y) since the
         date of this Indenture there has been a change in the applicable
         Federal income tax law, in either case to the effect that, and based
         thereon such opinion shall confirm that, the Holders of the
         Outstanding Securities of such series will not recognize income, gain
         or loss for Federal income tax purposes as a result of such deposit,
         defeasance and discharge and will be subject to Federal income tax on
         the same amounts, in the same manner and at the same times as would
         have been the case if such deposit, defeasance and discharge had not
         occurred.

                 (3)      In the case of an election under Section 1303, the
         Company shall have delivered to the Trustee an Opinion of Counsel to
         the effect that the Holders of the Outstanding Securities of such
         series will not recognize income, gain or loss for Federal income tax
         purposes as a result of such deposit and covenant defeasance and will
         be subject to Federal income tax on the same amount, in the same
         manner and at the same times as would have been the case if such
         deposit and covenant defeasance had not occurred.

                 (4)      No Event of Default or event which with notice or
         lapse of time or both would become an Event of Default with respect to
         the Securities of such series shall have occurred and be continuing on
         the date of such deposit or, insofar as subsections 501(5) and (6) are
         concerned, at any time during the period ending on the 91st day after
         the date of such deposit (it being understood that this condition
         shall not be deemed satisfied until the expiration of such period).

                 (5)      Such defeasance or covenant defeasance shall not
         cause the Trustee to       have a conflicting interest within the
         meaning of the Trust Indenture Act with respect to any securities of
         the Company.

                 (6)      Such defeasance or covenant defeasance shall not
         result in a breach or violation of, or constitute a default under, any
         other agreement or instrument to which the Company is a party or by
         which it is bound.

                 (7)      The Company shall have delivered to the Trustee an
         Officers' Certificate and an Opinion of Counsel, each stating that all
         conditions precedent provided for relating to either the defeasance
         under Section 1302 or the covenant defeasance under Section 1303 (as
         the case may be) have been complied with and, in the case of such
         Officers' Certificate,





                                      -62-
<PAGE>   69
         additionally stating that the deposit was not made by the Company with
         the intent of preferring the Holders of the Securities of such series
         over any other creditors of the Company or any Subsidiary Guarantor or
         with the intent of defeating, hindering, delaying or defrauding
         creditors of the Company or any Subsidiary Guarantor or others.

SECTION 1305.    Deposited Money and U.S. Government Obligations to Be Held in
                 Trust; Other Miscellaneous Provisions.

         Subject to the provisions of the last paragraph of Section 1003, all
money and U.S. Government Obligations (including the proceeds thereof)
deposited with the Trustee (or other qualifying trustee -- collectively, for
purposes of this Section 1305, the "Trustee") pursuant to Section 1304 in
respect of the Securities of such series shall be held in trust and applied by
the Trustee, in accordance with the provisions of such Securities of such
series and this Indenture, to the payment, either directly or through any
Paying Agent (including the Company acting as its own Paying Agent) as the
Trustee may determine, to the Holders of the Securities of such series, of all
sums due and to become due thereon in respect of principal (and premium, if
any) and interest, but such money need not be segregated from other funds
except to the extent required by law.

         The Company shall pay and indemnify the Trustee against any tax, fee
or other charge imposed on or assessed against the U.S. Government Obligations
deposited pursuant to Section 1304 or the principal and interest received in
respect thereof other than any such tax, fee or other charge which by law is
for the account of the Holders of the Outstanding Securities.

         Anything in this Article Thirteen to the contrary notwithstanding, the
Trustee shall deliver or pay to the Company from time to time upon Company
Request any money or U.S. Government Obligations held by it as provided in
Section 1304 which, in the opinion of a nationally recognized firm of
independent public accountants expressed in a written certification thereof
delivered to the Trustee, are in excess of the amount thereof which would then
be required to be deposited to effect an equivalent defeasance or covenant
defeasance.

SECTION 1306.  Reinstatement.

         If the Trustee or the Paying Agent is unable to apply any money in
accordance with Section 1305 by reason of any order or judgment of any court or
governmental authority enjoining, restraining or otherwise prohibiting such
application, then the Company's obligations under this Indenture and the
Securities of such series shall be revived and reinstated as though no deposit
had occurred pursuant to this Article Thirteen until such time as the Trustee
or Paying Agent is permitted to apply all such money in accordance with Section
1305; provided, however, that if the Company makes any payment of principal of
or any premium or interest on any Security following the reinstatement of its
obligations, the Company shall be subrogated to the rights of the Holders of
the Securities of such series to receive such payment from the money held by
the Trustee or the Paying Agent.





                                      -63-
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                                ARTICLE FOURTEEN
                       MEETINGS OF HOLDERS OF SECURITIES

SECTION 1401.  Purposes for Which Meetings May Be Called.

         If Securities of a series are issuable as Bearer Securities, a meeting
of Holders of Securities of such series may be called at any time and from time
to time pursuant to this Article to make, give or take any request, demand,
authorization, direction, notice, consent, waiver or other action provided by
this Indenture to be made, given or taken by Holders of Securities of such
series.

SECTION 1402.  Call, Notice and Place of Meetings.

         (a)     The Trustee may at any time call a meeting of Holders of
Securities of any series for any purpose specified in Section 1401, to be held
at such time and at such place in the Borough of Manhattan, The City of New
York, or in London, England as the Trustee shall determine.  Notice of every
meeting of Holders of Securities of any series, setting forth the time and the
place of such meeting and in general terms the action proposed to be taken at
such meeting, shall be given, in the manner provided in Section 106, not less
than 21 nor more than 120 days prior to the date fixed for the meeting.

         (b)     In case at any time the Company, pursuant to a Board
Resolution, or the Holders of at least 10% in principal amount of the
Outstanding Securities of any series shall have requested the Trustee to call a
meeting of the Holders of Securities of such series for any purpose specified
in Section 1401, by written request setting forth in reasonable detail the
action proposed to be taken at the meeting, and the Trustee shall not have made
the first publication of the notice of such meeting within 21 days after
receipt of such request or shall not thereafter proceed to cause the meeting to
be held as provided herein, then the Company or the Holders of Securities of
such series in the amount above specified, as the case may be, may determine
the time and the place in the Borough of Manhattan, The City of New York, or in
London, England for such meeting and may call such meeting for such purposes by
giving notice thereof as provided in subsection (a) of this Section.

SECTION 1403.  Persons Entitled to Vote at Meetings.

         To be entitled to vote at any meeting of Holders a Person shall (a) be
a Holder of one or more Securities or (b) be a Person appointed by an
instrument in writing as proxy by a Holder of one or more Securities.  The only
Persons who shall be entitled to be present or to speak at any meeting of
Holders shall be the Persons entitled to vote at such meeting and their counsel
and any representatives of the Trustee and its counsel and any representatives
of the Company and its counsel.

SECTION 1404.  Quorum; Action.

         The Persons entitled to vote a majority in principal amount of the
Outstanding Securities of a series shall constitute a quorum for a meeting of
Holders of Securities of such series.  In the absence of a quorum within 30
minutes of the time appointed for any such meeting, the meeting





                                      -64-
<PAGE>   71
shall, if convened at the request of Holders of Securities of such series, be
dissolved.  In any other case the meeting may be adjourned for a period of not
less than 10 days as determined by the chairman of the meeting prior to the
adjournment of such meeting.  In the absence of a quorum at any such adjourned
meeting, such adjourned meeting may be further adjourned for a period of not
less than 10 days as determined by the chairman of the meeting prior to the
adjournment of such adjourned meeting.  Notice of the reconvening of any
adjourned meeting shall be given as provided in Section 1402(a), except that
such notice need be given only once not less than five days prior to the date
on which the meeting is scheduled to be reconvened.  Notice of the reconvening
of an adjourned meeting shall state expressly the percentage, as provided
above, of the principal amount of the Outstanding Securities of such series
which shall constitute a quorum.

         Except as limited by Section 512 or the proviso to the first paragraph
of Section 902, any resolution presented to a meeting (or adjourned meeting
duly reconvened at which a quorum is present as aforesaid) may be adopted by
the affirmative vote of the Holders of a majority in principal amount of the
Outstanding Securities of that series; provided, however, that, any resolution
with respect to any request, demand, authorization, direction, notice, consent,
waiver or other action which this Indenture expressly provides may be made,
given or taken by the Holders of a specified percentage, which is less than a
majority, in principal amount of the Outstanding Securities of a series may be
adopted at a meeting (or an adjourned meeting duly reconvened and at which a
quorum is present as aforesaid) by the affirmative vote of the Holders of such
specified percentage in principal amount of the Outstanding Securities of that
series.

         To the extent consistent with the terms of this Indenture, any
resolution passed or decision taken at any meeting of Holders of Securities of
any series duly held in accordance with this Section shall be binding on all
the Holders of Securities of such series and the related coupons, whether or
not present or represented at the meeting.

SECTION 1405.  Determination of Voting Rights; Conduct and Adjournment of
               Meetings.

         (a)     Notwithstanding any other provisions of this Indenture, the
Trustee may make such reasonable regulations as it may deem advisable for any
meeting of Holders of Securities of a series in regard to proof of the holding
of Securities of such series and of the appointment of proxies and in regard to
the appointment and duties of inspectors of votes, the submission and
examination of proxies, certificates and other evidence of the right to vote,
and such other matters concerning the conduct of the meeting as it shall deem
appropriate.  Except as otherwise permitted or required by any such
regulations, the holding of Securities shall be proved in the manner specified
in Section 104 and the appointment of any proxy shall be proved in the manner
specified in Section 104 or by having the signature of the Person executing the
proxy witnessed or guaranteed by any trust company, bank or banker authorized
by Section 104 to certify to the holding of Bearer Securities.  Such
regulations may provide that written instruments appointing proxies, regular on
their face, may be presumed valid and genuine without the proof specified in
Section 104 or other proof.

         (b)     The Trustee shall, by an instrument in writing, appoint a
temporary chairman of the meeting, unless the meeting shall have been called by
the Company or by Holders of Securities as provided in Section 1402(b), in
which case the Company or the Holders of Securities of the series





                                      -65-
<PAGE>   72
calling the meeting, as the case may be, shall in like manner appoint a
temporary chairman.  A permanent chairman and a permanent secretary of the
meeting shall be elected by vote of the Persons entitled to vote a majority in
principal amount of the Outstanding Securities of such series represented at
the meeting.

         (c)     At any meeting each Holder of a Security of such series or
proxy shall be entitled to one vote for each $1,000 principal amount of the
Outstanding Securities of such series held or represented by him; provided,
however, that no vote shall be cast or counted at any meeting in respect of any
Security challenged as not Outstanding and ruled by the chairman of the meeting
to be not Outstanding.  The chairman of the meeting shall have no right to
vote, except as a Holder of a Security of such series or proxy.

         (d)     Any meeting of Holders of Securities of any series duly called
pursuant to Section 1402 at which a quorum is present may be adjourned from
time to time by Persons entitled to vote a majority in principal amount of the
Outstanding Securities of such series represented at the meeting; and the
meeting may be held as so adjourned without further notice.

SECTION 1406.  Counting Votes and Recording Action of Meetings.

         The vote upon any resolution submitted to any meeting of Holders of
Securities of any series shall be by written ballots on which shall be
subscribed the signatures of the Holders of Securities of such series or of
their representatives by proxy and the principal amounts and serial numbers of
the Outstanding Securities of such series held or represented by them.  The
permanent chairman of the meeting shall appoint two inspectors of votes who
shall count all votes cast at the meeting for or against any resolution and who
shall make and file with the secretary of the meeting their verified written
reports in duplicate of all votes cast at the meeting.  A record, at least in
duplicate, of the proceedings of each meeting of Holders of Securities of any
series shall be prepared by the secretary of the meeting and there shall be
attached to said record the original reports of the inspectors of votes on any
vote by ballot taken thereat and affidavits by one or more persons having
knowledge of the facts setting forth a copy of the notice of the meeting and
showing that said notice was given as provided in Section 1402 and, if
applicable, Section 1404.  Each copy shall be signed and verified by the
affidavits of the permanent chairman and secretary of the meeting and one such
copy shall be delivered to the Company, and another to the Trustee to be
preserved by the Trustee, the latter to have attached thereto the ballots voted
at the meeting.  Any record so signed and verified shall be conclusive evidence
of the matters therein stated.                    

                     -----------------------------------




                                      -66-
<PAGE>   73
         This instrument may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.





                                      -67-
<PAGE>   74
         IN WITNESS WHEREOF, the parties hereto have caused this Indenture to
be duly executed, all as of the day and year first above written.

                                  MARINE DRILLING COMPANIES, INC.

                                  By:                                        
                                     ----------------------------------------
                                  Name:                                      
                                       --------------------------------------
                                  Title:                                     
                                        -------------------------------------

                                  CHASE BANK OF TEXAS, NATIONAL ASSOCIATION,
                                  AS TRUSTEE

                                  By:                                        
                                     ----------------------------------------
                                  Name:                                      
                                       --------------------------------------
                                  Title:                                     
                                        -------------------------------------

                                  SUBSIDIARY GUARANTORS:

                                  MARINE DRILLING MANAGEMENT COMPANY

                                  By:                                        
                                     ----------------------------------------
                                  Name:                                      
                                       --------------------------------------
                                  Title:                                     
                                        -------------------------------------

                                  MARINE DRILLING INTERNATIONAL, INC.

                                  By:                                        
                                     ----------------------------------------
                                  Name:                                      
                                       --------------------------------------
                                  Title:                                     
                                        -------------------------------------

                                  MARINE 300 SERIES, INC.

                                  By:                                        
                                     ----------------------------------------
                                  Name:                                      
                                       --------------------------------------
                                  Title:                                     
                                        -------------------------------------






                                      -68-
<PAGE>   75
                                   EXHIBIT A

                       FORM OF CERTIFICATE TO BE GIVEN BY
                              BENEFICIAL OWNER OF
                    INTEREST IN A TEMPORARY GLOBAL SECURITY

                        MARINE DRILLING COMPANIES, INC.

                             [Title of Securities]

                               (the "Securities")

         This is to certify that as of the date hereof, and except as set forth
below, the above-captioned Securities held by you for our account (i) are owned
by person(s) that are not citizens or residents of the United States, domestic
partnerships, domestic corporations or any estate or trust the income of which
is subject to United States Federal income taxation regardless of its source
("United States persons"), (ii) are owned by United States person(s) that are
(A) foreign branches of United States financial institutions (as defined in
U.S. Treasury Regulations Section 1.165-12(c)(1)(v)) ("financial institutions")
purchasing for their own account or for resale, or (B) United States person(s)
who acquired Securities through the foreign branches of the United States
financial institutions and who hold the Securities through such United States
financial institutions on the date hereof (and in either case (A) or (B), each
such United States financial institution hereby agrees, on its own behalf or
through its agent, to comply with the requirements of Section 165(j)(3)(A), (B)
or (C) of the Internal Revenue Code of 1986 as amended, and the regulations
thereunder), or (iii) are owned by United States or foreign financial
institution(s) for purposes of resale during the restricted period (as defined
in U.S. Treasury Regulations Section 1.163-5(c)(2)(i)(D)(7)), and in addition
if the owner of the Securities is a United States or foreign financial
institution described in clause (iii) above (whether or not also described in
clause (i) or (ii)), this is to further certify that such financial institution
has not acquired the Securities for purposes of resale directly or indirectly
to a United States person or to a person within the United States or its
possessions.

         If the Securities are of the category contemplated in Section
230.903(c)(3) of Regulation S under the Securities Act of 1933, as amended (the
"Act"), then this is also to certify that, except as set forth below (i) in the
case of debt securities, the Securities are beneficially owned by (a) non-U.S.
person(s) or (b) U.S. person(s) who purchased the Securities in transactions
which did not require registration under the Act; or (ii) in the case of equity
securities, the Securities are owned by (x) non-U.S. person(s) (and such
person(s) are not acquiring the Securities for the account or benefit of U.S.
person(s)), or (y) U.S. person(s) who purchased the Securities in a transaction
which did not require registration under the Act.  If this certification is
being delivered in connection with the exercise of warrants pursuant to Section
230.902(m) of Regulation S under the Act, then this is further to certify that,
except as set forth below, the Securities are being exercised by and on behalf
of non-U.S. person(s).  As used in this paragraph, the term "U.S. person" has
the meaning given to it by Regulation S under the Act.





                                      A-1
<PAGE>   76
         As used herein, "United States" or "U.S." means the United States of
America (including the States and District of Columbia); and its "possessions"
include Puerto Rico, the U.S. Virgin Islands, Guam, American Samoa, Wake Island
and the Northern Mariana Islands.

         We undertake to advise you promptly by tested telex on or prior to the
date on which you intend to submit your certification relating to the
Securities held by you for our account in accordance with your Operating
Procedures if any applicable statement herein is not correct on such date, and
in the absence of any such notification it may be assumed that this
certification applies as of such date.

         This certification excepts and does not relate to $___________ such
interest in the above Securities in respect of which we are not able to certify
and as to which we understand exchange and delivery of definitive Securities
(or, if relevant, exercise of any rights or collection of any interest) cannot
be made until we do so certify.

         We understand that this certification is required in connection with
certain tax laws and, if applicable, certain securities laws of the United
States.  In connection therewith, if administrative or legal proceedings are
commenced or threatened in connection with which this certification is or would
be relevant, we irrevocably authorize you to produce this certification to any
interested party in such proceedings.

*Dated:
       ----------------------------
                                          NAME OF PERSON MAKING CERTIFICATION


                                          By:
                                             ----------------------------------




- -------------------------
* To be dated no earlier than the Certification Date.





                                      A-2
<PAGE>   77
                                   EXHIBIT B

                    FORM OF CERTIFICATION TO BE GIVEN BY THE
                       EURO-CLEAR OPERATOR OR CEDEL S.A.

                        MARINE DRILLING COMPANIES, INC.

                             [Title of Securities]

                               (the "Securities")

         This is to certify that, based solely on certifications we have
received in writing, by tested telex or by electronic transmission from member
organizations appearing in our records as persons being entitled to a portion
of the principal amount set forth below (our "Member Organizations")
substantially to the effect set forth in the Indenture, dated as of __________,
1998, between Marine Drilling Companies, Inc., the Subsidiary Guarantors named
therein and Chase Bank of Texas, National Association, as of the date hereof [
] principal amount of the above-captioned Securities (i) is owned by persons
that are not citizens or residents of the United States, domestic partnerships,
domestic corporations or any estate or trust the income of which is subject to
United States Federal income taxation regardless of its source ("United States
persons"), (ii) is owned by United States persons that are (A) foreign branches
of United States financial institutions (as defined in U.S. Treasury
Regulations Section 1.16512(c)(1)(v)) ("financial institutions") purchasing for
their own account or for resale, or (B) United States persons who acquired the
Securities through foreign branches of United States financial institutions and
who hold the Securities through such United States financial institutions on
the date hereof (and in either case (A) or (B), each such United States
financial institution has agreed, on its own behalf or through its agent, that
it will comply with the requirements of Section 165(1)(3)(A), (B) or (C) of the
Internal Revenue Code of 1986, as amended, and the regulations thereunder), or
(iii) is owned by United States or foreign financial institutions for purposes
of resale during the restricted period (as defined in U.S.  Treasury
Regulations Section 1.1635(c)(2)(i)(D)(7)), and to the further effect that the
United States or foreign financial institutions described in clause (iii) above
(whether or not also described in clause (i) or (ii)) have certified that they
have not acquired the Securities for purposes of resale directly or indirectly
to a United States person or to a person within the United States or its
possessions.

         If the Securities are of the category contemplated in Section
230.903(c)(3) of Regulation S under the Securities Act of 1933, as amended,
then this is also to certify with respect to such principal amount of
Securities set forth above that, except as set forth below, we have received in
writing, by tested telex or by electronic transmission, from our Member
Organizations entitled to a portion of such principal amount, certifications
with respect to such portion, substantially to the effect set forth in the
Indenture.

         We further certify (i) that we are not making available herewith for
exchange (or, if relevant, exercise of any rights or collection of any
interest) any portion of the temporary global Security excepted in such
certifications and (ii) that as of the date hereof we have not received any
notification from any of our Member Organizations to the effect that the
statements made by such Member Organizations with respect to any portion of the
part submitted herewith for exchange (or,





                                      B-1
<PAGE>   78
if relevant, exercise of any rights or collection of any interest) are no
longer true and cannot be relied upon as of the date hereof.

         We understand that this certification is required in connection with
certain tax laws and, if applicable, certain securities laws of the United
States.  In connection therewith, if administrative or legal proceedings are
commenced or threatened in connection with which this certification is or would
be relevant, we irrevocably authorize you to produce this certification or a
copy hereof to any interested party in such proceedings.

Dated:                                                       
      ----------------------------------

(dated the Exchange Date or the Interest
Payment Date)

                                   [Morgan Guaranty Trust Company of New
                                   York, as operator of the Euro-clear
                                   System]

                                   or

                                   [CEDEL S.A.]


                                   By:                                       
                                      --------------------------------------






                                      B-2

<PAGE>   1

                                                                     EXHIBIT 4.4

================================================================================



                        MARINE DRILLING COMPANIES, INC.

                                      AND

                             SUBSIDIARY GUARANTORS


                                       TO

                   CHASE BANK OF TEXAS, NATIONAL ASSOCIATION


                                    TRUSTEE



                             SUBORDINATED INDENTURE


                          Dated as of __________, 1998


================================================================================
<PAGE>   2
                        MARINE DRILLING COMPANIES, INC.
         RECONCILIATION AND TIE BETWEEN TRUST INDENTURE ACT OF 1939 AND
                    INDENTURE DATED AS OF ____________, 1998


<TABLE>
<CAPTION>
Trust Indenture
   Act Section                                                                                Indenture Section
- -----------------                                                                             -----------------
<S>                                                                                                    <C>
Section 310(a)(1)     ..............................................................................   609
           (a)(2)     ..............................................................................   609
           (a)(3)     ..............................................................................   Not applicable
           (a)(4)     ..............................................................................   Not applicable
           (b)        ..............................................................................   608
                      ..............................................................................   610
Section 311(a)        ..............................................................................   613
           (b)        ..............................................................................   613
Section 312(a)        ..............................................................................   701
                      ..............................................................................   702
           (b)        ..............................................................................   702
           (c)        ..............................................................................   702
Section 313(a)        ..............................................................................   703
           (b)        ..............................................................................   703
           (c)        ..............................................................................   703
           (d)        ..............................................................................   703
Section 314(a)(1)-(3) ..............................................................................   704, 1006
           (a)(4)     ..............................................................................   101
                      ..............................................................................   1004
           (b)        ..............................................................................   Not applicable
           (c)(1)     ..............................................................................   102
           (c)(2)     ..............................................................................   102
           (c)(3)     ..............................................................................   Not Applicable
           (d)        ..............................................................................   Not Applicable
           (e)        ..............................................................................   102
Section 315(a)        ..............................................................................   601
           (b)        ..............................................................................   602
           (c)        ..............................................................................   601
           (d)        ..............................................................................   601
           (e)        ..............................................................................   514
Section 316(a)        ..............................................................................   101
           (a)(1)(A)  ..............................................................................   502
                      ..............................................................................   512
           (a)(1)(B)  ..............................................................................   513
           (a)(2)     ..............................................................................   Not applicable
           (b)        ..............................................................................   508
           (c)        ..............................................................................   104
Section 317(a)(1)     ..............................................................................   503
           (a)(2)     ..............................................................................   504
           (b)        ..............................................................................   1003
Section 318(a)        ..............................................................................   108
</TABLE>

- ---------------
NOTE:  This reconciliation and tie shall not, for any purpose, be deemed to be
       part of the Indenture.





                                       a
<PAGE>   3
                               TABLE OF CONTENTS


<TABLE>
<S>                                                                                                                    <C>
RECITALS OF THE COMPANY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
         ARTICLE ONE
                 DEFINITIONS AND OTHER PROVISIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
                 SECTION 101.  Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
                 SECTION 102.  Compliance Certificates and Opinions.  . . . . . . . . . . . . . . . . . . . . . . . .  10
                 SECTION 103.  Form of Documents Delivered to Trustee.  . . . . . . . . . . . . . . . . . . . . . . .  10
                 SECTION 104.  Acts of Holders. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                 SECTION 105.  Notices, Etc., to Trustee, Company and Subsidiary
                                           Guarantors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
                 SECTION 106.  Notice to Holders of Securities; Waiver. . . . . . . . . . . . . . . . . . . . . . . .  13
                 SECTION 107.  Language of Notices, Etc.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                 SECTION 108.  Conflict with Trust Indenture Act. . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                 SECTION 109.  Effect of Headings and Table of Contents . . . . . . . . . . . . . . . . . . . . . . .  14
                 SECTION 110.  Successors and Assigns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                 SECTION 111.  Separability Clause  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                 SECTION 112.  Benefits of Indenture  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                 SECTION 113.  Governing Law  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                 SECTION 114.  Legal Holidays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                 SECTION 115.  Partners, Incorporators, Stockholders, Officers and
                                           Directors of Issuer and the Trustee Exempt from
                                           Individual Liability.  . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                 SECTION 116.  Counterparts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15

         ARTICLE TWO
                 SECURITY FORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                 SECTION 201.  Forms Generally  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                 SECTION 202.  Form of Trustee's Certificate of Authentication  . . . . . . . . . . . . . . . . . . .  16
                 SECTION 203.  Securities in Global Form  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
                 SECTION 204.  Form of Legend for Book-Entry Securities.  . . . . . . . . . . . . . . . . . . . . . .  17

         ARTICLE THREE
                 THE SECURITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
                 SECTION 301.  Amount Unlimited; Issuable in Series . . . . . . . . . . . . . . . . . . . . . . . . .  17
                 SECTION 302.  Denominations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
                 SECTION 303.  Execution, Authentication, Delivery and Dating . . . . . . . . . . . . . . . . . . . .  21
                 SECTION 304.  Temporary Securities.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  23
                 SECTION 305.  Registration, Registration of Transfer and Exchange  . . . . . . . . . . . . . . . . .  25
                 SECTION 306.  Mutilated, Destroyed, Lost and Stolen Securities and
                                           Coupons  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
                 SECTION 307.  Payment of Interest; Interest Rights Preserved . . . . . . . . . . . . . . . . . . . .  29
                 SECTION 308.  Persons Deemed Owners  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
                 SECTION 309.  Cancellation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
</TABLE>





                                       i
<PAGE>   4
<TABLE>
         <S>                                                                                                           <C>
                 SECTION 310.  Computation of Interest  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31

         ARTICLE FOUR
                 SATISFACTION AND DISCHARGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
                 SECTION 401.  Satisfaction and Discharge of Indenture  . . . . . . . . . . . . . . . . . . . . . . .  31
                 SECTION 402.  Application of Trust Money . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33

         ARTICLE FIVE
                 REMEDIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                 SECTION 501.  Events of Default  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                 SECTION 502.  Acceleration of Maturity; Rescission and Annulment . . . . . . . . . . . . . . . . . .  34
                 SECTION 503.  Collection of Indebtedness and Suits for Enforcement by
                                           Trustee  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  35
                 SECTION 504.  Trustee May File Proofs of Claim . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
                 SECTION 505.  Trustee May Enforce Claims Without Possession of
                                           Securities or Coupons  . . . . . . . . . . . . . . . . . . . . . . . . . .  36
                 SECTION 506.  Application of Money Collected . . . . . . . . . . . . . . . . . . . . . . . . . . . .  37
                 SECTION 507.  Limitation on Suits  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  38
                 SECTION 508.  Unconditional Right of Holders to Receive Principal,
                                           Premium and Interest . . . . . . . . . . . . . . . . . . . . . . . . . . .  38
                 SECTION 509.  Restoration of Rights and Remedies . . . . . . . . . . . . . . . . . . . . . . . . . .  39
                 SECTION 510.  Rights and Remedies Cumulative . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39
                 SECTION 511.  Delay or Omission Not Waiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39
                 SECTION 512.  Control by Holders of Securities . . . . . . . . . . . . . . . . . . . . . . . . . . .  39
                 SECTION 513.  Waiver of Past Defaults  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40
                 SECTION 514.  Undertaking for Costs  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40
                 SECTION 515.  Waiver of Stay or Extension Laws . . . . . . . . . . . . . . . . . . . . . . . . . . .  40

         ARTICLE SIX
                 THE TRUSTEE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  41
                 SECTION 601.  Certain Duties and Responsibilities  . . . . . . . . . . . . . . . . . . . . . . . . .  41
                 SECTION 602.  Notice of Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  41
                 SECTION 603.  Certain Rights of Trustee  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  41
                 SECTION 604.  Not Responsible for Recitals or Issuance of Securities . . . . . . . . . . . . . . . .  43
                 SECTION 605.  May Hold Securities  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
                 SECTION 606.  Money Held in Trust  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
                 SECTION 607.  Compensation and Reimbursement . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
                 SECTION 608.  Disqualification; Conflicting Interests  . . . . . . . . . . . . . . . . . . . . . . .  44
                 SECTION 609.  Corporate Trustee Required; Eligibility  . . . . . . . . . . . . . . . . . . . . . . .  44
                 SECTION 610.  Resignation and Removal; Appointment of Successor  . . . . . . . . . . . . . . . . . .  45
                 SECTION 611.  Acceptance of Appointment by Successor . . . . . . . . . . . . . . . . . . . . . . . .  46
                 SECTION 612.  Merger, Conversion, Consolidation or Succession to
                                           Business . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
                 SECTION 613.  Preferential Collection of Claims Against Company  . . . . . . . . . . . . . . . . . .  47
                 SECTION 614.  Appointment of Authenticating Agent  . . . . . . . . . . . . . . . . . . . . . . . . .  48
</TABLE>





                                       ii
<PAGE>   5
<TABLE>
         <S>                                                                                                           <C>
         ARTICLE SEVEN
                 HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY  . . . . . . . . . . . . . . . . . . . . . . . . .  49
                 SECTION 701.  Company to Furnish Trustee Names and Addresses
                                           of Holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
                 SECTION 702.  Preservation of Information;  Communications to Holders  . . . . . . . . . . . . . . .  50
                 SECTION 703.  Reports by Trustee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
                 SECTION 704.  Reports by Company . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  51

         ARTICLE EIGHT
                 CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE . . . . . . . . . . . . . . . . . . . . . . . .  51
                 SECTION 801.  Company May Consolidate, Etc., Only on Certain Terms . . . . . . . . . . . . . . . . .  51
                 SECTION 802.  Successor Substituted  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  51

         ARTICLE NINE
                 SUPPLEMENTAL INDENTURES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  52
                 SECTION 901.  Supplemental Indentures without Consent of Holders . . . . . . . . . . . . . . . . . .  52
                 SECTION 902.  Supplemental Indentures with Consent of Holders  . . . . . . . . . . . . . . . . . . .  53
                 SECTION 903.  Execution of Supplemental Indentures . . . . . . . . . . . . . . . . . . . . . . . . .  54
                 SECTION 904.  Effect of Supplemental Indentures  . . . . . . . . . . . . . . . . . . . . . . . . . .  55
                 SECTION 905.  Conformity with Trust Indenture Act  . . . . . . . . . . . . . . . . . . . . . . . . .  55
                 SECTION 906.  Reference in Securities to Supplemental Indentures . . . . . . . . . . . . . . . . . .  55
                 SECTION 907.  Subordination Unimpaired.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  55

         ARTICLE TEN
                 COVENANTS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  55
                 SECTION 1001.  Payment of Principal, Premium and Interest  . . . . . . . . . . . . . . . . . . . . .  55
                 SECTION 1002.  Maintenance of Office or Agency . . . . . . . . . . . . . . . . . . . . . . . . . . .  56
                 SECTION 1003.  Money for Securities Payments to Be Held in Trust . . . . . . . . . . . . . . . . . .  57
                 SECTION 1004.  Additional Amounts  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  58
                 SECTION 1005.  Purchase of Securities by Company or Subsidiary . . . . . . . . . . . . . . . . . . .  59
                 SECTION 1006.  Statement by Officer as to Default  . . . . . . . . . . . . . . . . . . . . . . . . .  59
                 SECTION 1007.  Waiver of Certain Covenants . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  59

         ARTICLE ELEVEN
                 REDEMPTION OF SECURITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  60
                 SECTION 1101.  Applicability of Article  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  60
                 SECTION 1102.  Election to Redeem; Notice to Trustee . . . . . . . . . . . . . . . . . . . . . . . .  60
                 SECTION 1103.  Selection of Securities to Be Redeemed  . . . . . . . . . . . . . . . . . . . . . . .  60
                 SECTION 1104.  Notice of Redemption  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  61
                 SECTION 1105.  Deposit of Redemption Price . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  62
                 SECTION 1106.  Securities Payable on Redemption Date . . . . . . . . . . . . . . . . . . . . . . . .  62
                 SECTION 1107.  Securities Redeemed in Part . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  63
</TABLE>





                                      iii
<PAGE>   6
<TABLE>
         <S>                                                                                                           <C>
         ARTICLE TWELVE
                 SINKING FUNDS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  63
                 SECTION 1201.  Applicability of Article  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  63
                 SECTION 1202.  Satisfaction of Sinking Fund Payments with Securities . . . . . . . . . . . . . . . .  64
                 SECTION 1203.  Redemption of Securities for Sinking Fund . . . . . . . . . . . . . . . . . . . . . .  64

         ARTICLE THIRTEEN
                 DEFEASANCE AND COVENANT DEFEASANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  64
                 SECTION 1301.  Company's Option to Effect Defeasance or Covenant
                                           Defeasance.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  64
                 SECTION 1302.  Defeasance and Discharge  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  64
                 SECTION 1303.  Covenant Defeasance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  65
                 SECTION 1304.  Conditions to Defeasance or Covenant Defeasance . . . . . . . . . . . . . . . . . . .  65
                 SECTION 1305.  Deposited Money and U.S. Government Obligations to Be
                                           Held in Trust; Other Miscellaneous Provisions  . . . . . . . . . . . . . .  67
                 SECTION 1306.  Reinstatement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  68

         ARTICLE FOURTEEN
                 MEETINGS OF HOLDERS OF SECURITIES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  68
                 SECTION 1401.  Purposes for Which Meetings May Be Called . . . . . . . . . . . . . . . . . . . . . .  68
                 SECTION 1402.  Call, Notice and Place of Meetings  . . . . . . . . . . . . . . . . . . . . . . . . .  68
                 SECTION 1403.  Persons Entitled to Vote at Meetings  . . . . . . . . . . . . . . . . . . . . . . . .  69
                 SECTION 1404.  Quorum; Action  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  69
                 SECTION 1405.  Determination of Voting Rights; Conduct and
                                           Adjournment of Meetings  . . . . . . . . . . . . . . . . . . . . . . . . .  70
                 SECTION 1406.  Counting Votes and Recording Action of Meetings . . . . . . . . . . . . . . . . . . .  70

         ARTICLE FIFTEEN
                 CONVERSION OF SECURITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  71
                 SECTION 1501.  Applicability of Article. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  71
                 SECTION 1502.  Exercise of Conversion Privilege. . . . . . . . . . . . . . . . . . . . . . . . . . .  71
                 SECTION 1503.  Fractional Interests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  72
                 SECTION 1504.  Adjustment of Conversion Price. . . . . . . . . . . . . . . . . . . . . . . . . . . .  73
                 SECTION 1505.  Continuation of Conversion Privilege in Case of
                                           Merger, Consolidation or Sale of Assets. . . . . . . . . . . . . . . . . .  73
                 SECTION 1506.  Notice of Certain Events. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  74
                 SECTION 1507.  Taxes on Conversion.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  75
                 SECTION 1508.  Company to Provide Stock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  76
                 SECTION 1509.  Disclaimer of Responsibility for Certain Matters. . . . . . . . . . . . . . . . . . .  76
                 SECTION 1510.  Return of Funds Deposited for Redemption of
                                           Converted Securities.  . . . . . . . . . . . . . . . . . . . . . . . . . .  77

         ARTICLE SIXTEEN
                 SUBORDINATION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  77
                 SECTION 1601.  Securities Subordinated to Senior Indebtedness. . . . . . . . . . . . . . . . . . . .  77
                 SECTION 1602.  Reliance on Certificate of Liquidating Agent; Further
                                           Evidence as to Ownership of Senior Indebtedness. . . . . . . . . . . . . .  79
</TABLE>





                                       iv
<PAGE>   7
<TABLE>
                 <S>            <C>                                                                                    <C>
                 SECTION 1603.  Application by Trustee of Assets Deposited with It. . . . . . . . . . . . . . . . . .  80
                 SECTION 1604.  Disputes with Holders of Certain Senior Indebtedness. . . . . . . . . . . . . . . . .  80
                 SECTION 1605.  Trustee Not Charged with Knowledge of Prohibition.  . . . . . . . . . . . . . . . . .  81
                 SECTION 1606.  Trustee to Effectuate Subordination.  . . . . . . . . . . . . . . . . . . . . . . . .  81
                 SECTION 1607.  Rights of Trustee as Holder of Senior Indebtedness. . . . . . . . . . . . . . . . . .  82
                 SECTION 1608.  Article Applicable to Paying Agents.  . . . . . . . . . . . . . . . . . . . . . . . .  82
                 SECTION 1609.  Subordination Rights Not Impaired by Acts or Omissions
                                           of the Company or Holders of Senior Indebtedness.  . . . . . . . . . . . .  82
                 SECTION 1610.  Trustee Not Fiduciary for Holders of Senior Indebtedness. . . . . . . . . . . . . . .  82
                 SECTION 1611.  Subordination of Subsidiary Guarantees. . . . . . . . . . . . . . . . . . . . . . . .  82
</TABLE>





                                       v
<PAGE>   8
         THIS SUBORDINATED INDENTURE, dated as of ___________, 1998, is by and
among MARINE DRILLING COMPANIES, INC., a corporation duly organized and
existing under the laws of the State of Texas (herein called the "Company"),
having its principal office at One Sugar Creek Blvd., Suite 600, Sugar Land,
Texas 77478-3556,  the Subsidiary Guarantors (as defined herein) and CHASE BANK
OF TEXAS, NATIONAL ASSOCIATION, a national banking association organized under
the laws of the United States of America, as Trustee (herein called the
"Trustee").

                            RECITALS OF THE COMPANY

         The Company has duly authorized the execution and delivery of this
Indenture to provide for the issuance from time to time of its subordinated
debentures, notes or other evidences of indebtedness (herein called the
"Securities"), to be issued in one or more series, either with or without the
benefit of Subsidiary Guarantees (as defined herein), as in this Indenture
provided.

         All things necessary to make this Indenture a valid agreement of the
Company, in accordance with its terms, have been done.

         NOW, THEREFORE, THIS INDENTURE WITNESSETH:

         For and in consideration of the premises and the purchase of the
Securities by the Holders thereof, it is mutually agreed, for the equal and
proportionate benefit of all Holders of the Securities or of a series thereof,
as follows:

                                  ARTICLE ONE
                        DEFINITIONS AND OTHER PROVISIONS
                             OF GENERAL APPLICATION

SECTION 101.  Definitions.

         For all purposes of this Indenture, except as otherwise expressly
provided herein or in the terms of any series of Securities established
hereunder, or unless the context otherwise requires:

                 (1)      the terms defined in this Article have the meanings
         assigned to them in this Article and include the plural as well as the
         singular;

                 (2)      the term "obligor" on the Securities of any series
         means the Company, any Subsidiary Guarantor with respect to such
         Securities and any successor obligor upon the Securities of such
         series, and all other terms used herein which are defined in the Trust
         Indenture Act, either directly or by reference therein, have the
         meanings assigned to them therein;

                 (3)      all accounting terms not otherwise defined herein
         have the meanings assigned to them in accordance with generally
         accepted accounting principles in the United States of America, and,
         except as otherwise herein expressly provided, the term "generally
         accepted accounting principles" with respect to any computation
         required or permitted hereunder shall mean such accounting principles
         as are generally accepted in the United States of America as of the
         date of such computation; and
<PAGE>   9
                 (4)      the words "herein", "hereof" and "hereunder" and
         other words of similar import refer to this Indenture as a whole and
         not to any particular Article, Section or other subdivision, and the
         words "date of this Indenture" and "date hereof" and other words of
         similar import refer to the effective date of the original execution
         and delivery of this Indenture, viz. ___________, 1998.

         "Act", when used with respect to any Holder of a Security, has the
meaning specified in Section 104.

         "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person.  For the purposes of this definition
"control," when used with respect to any specified Person, means the power to
direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

         "Authenticating Agent" means any Person authorized by the Trustee
pursuant to Section 614 to act on behalf of the Trustee to authenticate
Securities of one or more series.

         "Authorized Newspaper" means a newspaper, in the English language or
in an official language of the country of publication, customarily published on
each Business Day, whether or not published on Saturdays, Sundays or holidays,
and of general circulation in the place in connection with which the term is
used or in the financial community of such place.  Where successive
publications are required to be made in Authorized Newspapers, the successive
publications may be made in the same or in different newspapers in the same
city meeting the foregoing requirements and in each case on any Business Day.

         "Bearer Security" means any Security in the form established pursuant
to Section 201 which is payable to bearer, including, without limitation, a
Security in temporary or permanent global form.

         "Board of Directors" means either the board of directors of the
Company or any duly authorized committee of that board.

         "Board Resolution" means a copy of a resolution certified by the
Secretary or an Assistant Secretary of the Company to have been duly adopted by
the Board of Directors and to be in full force and effect on the date of such
certification, and delivered to the Trustee.

         "Book-Entry Security" means a Security bearing the legend specified in
Section 204, evidencing all or part of a series of Securities, issued to the
Depository for such series or its nominee, and registered in the name of such
Depository or nominee.  Book-Entry Securities shall not be deemed to be
Securities in global form for purposes of Sections 201 and 203 and Article
Three of this Indenture.





                                       2
<PAGE>   10
         "Business Day", when used with respect to any Place of Payment or any
other particular location referred to in this Indenture or in the Securities,
means each Monday, Tuesday, Wednesday, Thursday and Friday which is not a day
on which banking institutions in that Place of Payment or other location are
authorized or obligated by law or executive order to close.

         "Capitalized Lease Obligation" means rental obligations under a lease
that are required to be capitalized for financial reporting purposes in
accordance with generally accepted accounting principles, and the amount of
Indebtedness represented by such obligations shall be the capitalized amount of
such obligations, as determined in accordance with generally accepted
accounting principles.

         "Capital Stock" means, with respect to any corporation, any and all
shares, interests, rights to purchase (other than convertible or exchangeable
Indebtedness), warrants, options, participations or other equivalents of or
interests (however designated) in stock issued by that corporation.

         "Certification Date" means with respect to Securities of any series
(i), if Bearer Securities of such series are not to be initially represented by
a temporary global Security, the date of delivery of the definitive Bearer
Security and (ii), if Bearer Securities of such series are initially
represented by a temporary global Security, the earlier of (A) the Exchange
Date with respect to Securities of such series and (B), if the first Interest
Payment Date with respect to Securities of such series is prior to such
Exchange Date, such Interest Payment Date.

         "Commission" means the Securities and Exchange Commission, as from
time to time constituted, created under the Securities Exchange Act of 1934,
or, if at any time after the execution of this instrument such Commission is
not existing and performing the duties now assigned to it under the Trust
Indenture Act, then the body performing such duties at such time.

         "Common Depositary" has the meaning specified in Section 304.

         "Common Stock" means the Common Stock, par value $.01 per share, of
the Company as the same exists at the date of execution and delivery of this
Indenture or other capital stock of the Company into which such Common Stock is
converted, reclassified or changed from time to time.

         "Company" means the Person named as the "Company" in the first
paragraph of this instrument until a successor Person shall have become such
pursuant to the applicable provisions of this Indenture, and thereafter
"Company" shall mean such successor Person.

         "Company Request" or "Company Order" means a written request or order
signed in the name of the Company by its Chairman of the Board, its President
or a Vice President, and by its Treasurer, an Assistant Treasurer, its
Controller, its Secretary or an Assistant Secretary, and delivered to the
Trustee.

         "Conversion Agent" means any Person authorized by the Company to
convert any Securities on behalf of the Company.





                                       3
<PAGE>   11
         "Conversion Price" has the meaning specified in Section 1504.

         "Corporate Trust Office" means the office of the Trustee in Dallas,
Texas or Houston, Texas, at which at any particular time its corporate trust
business shall be administered, which, as of the date hereof, is as follows:
(a) for payment, registration, transfer, exchange and tender of the Securities:
Chase Bank of Texas, National Association, One Main Place, 1201 Main Street,
18th Floor, Dallas, Texas 75202, telephone:  (800) 275-2048, telecopy: (214)
672-5746; and (b) for all other communications relating to the Securities:
Chase Bank of Texas, National Association, 600 Travis Street, Suite 1150,
Houston, Texas 77002, Attention:  Global Trust Services - Marine Drilling
Companies, Inc., telephone: (713) 216-6686, telecopy: (713) 216-5476.

         The term "corporation" means a corporation, association, limited
liability company, joint-stock company or business trust.

         The term "coupon" means any interest coupon appertaining to a Bearer
Security.

         "Date of Conversion" has the meaning set forth in Section 1502.

         "Defaulted Interest" has the meaning specified in Section 307.

         "Depository" means, with respect to the Securities of any series
issuable or issued in whole or in part in the form of one or more Book-Entry
Securities, the clearing agency registered under the Securities Exchange Act of
1934, specified for that purpose as contemplated by Section 301.

         "Disqualified Capital Stock" means (a) except as set forth in (b),
with respect to any Person, Capital Stock of such Person that, by its terms or
by the terms of any security into or for which it is convertible, exercisable
or exchangeable, is, or upon the happening of an event or the passage of time
would be, required to be redeemed or repurchased (including at the option of
the holder thereof) by such Person or any of its Subsidiaries, in whole or in
part, on or prior to the latest Stated Maturity of the principal of any
Outstanding Securities and (b) with respect to any Subsidiary of such Person
(including with respect to any Subsidiary of the Company), any Capital Stock
other than any common stock with no preference, privileges, or redemption or
repayment provisions.

         "Dollar" or "$" means a dollar or other equivalent unit in such coin
or currency of the United States of America as at the time shall be legal
tender for the payment of public and private debts.

         "Euro-clear" means the operator of the Euro-clear System.

         "Event of Default" has the meaning specified in Section 501.

         "Exchange Date" has the meaning specified in Section 304.

         "Holder", when used with respect to any Security, means in the case of
a Registered Security the Person in whose name the Security is registered in
the Security Register and in the case of a





                                       4
<PAGE>   12
Bearer Security the bearer thereof and, when used with respect to any coupon,
means the bearer thereof.

         "Indebtedness" means, with respect to any Person, without duplication,
(a) all liabilities and obligations, contingent or otherwise, of any such
Person, (i) in respect of borrowed money (whether or not the recourse of the
lender is to the whole of the assets of such Person or only to a portion
thereof), (ii) evidenced by bonds, notes, debentures or similar instruments,
(iii) representing the balance deferred and unpaid of the purchase price of any
property or services, except such as would constitute trade payables to trade
creditors in the ordinary course of business, (iv) evidenced by bankers'
acceptances or similar instruments issued or accepted by banks, (v) for the
payment of money relating to a Capitalized Lease Obligation, or (vi) evidenced
by a letter of credit or a reimbursement obligation of such Person with respect
to any letter of credit; (b) all net obligations of such Person under Interest
Swap and Hedging Obligations; (c) all liabilities of others of the kind
described in the preceding clause (a) or (b) that such Person has guaranteed or
that is otherwise its legal liability and all obligations to purchase, redeem
or acquire any Capital Stock; and (d) any and all deferrals, renewals,
extensions, refinancings, refundings (whether direct or indirect) of any
liability of the kind described in any of the preceding clause (a), (b) or (c),
or this clause (d), whether or not between or among the same parties.

         "Indenture" means this instrument as originally executed or as it may
from time to time be supplemented or amended by one or more indentures
supplemental hereto entered into pursuant to the applicable provisions hereof
and shall include the terms of particular series of Securities established as
contemplated by Section 301.

         The term "interest", when used with respect to an Original Issue
Discount Security which by its terms bears interest only after Maturity, means
interest payable after Maturity.

         "Interest Payment Date", when used with respect to any Security, means
the Stated Maturity of an installment of interest on such Security.

         "Interest Swap and Hedging Obligation" means any obligation of any
Person pursuant to any interest rate swap agreement, interest rate cap
agreement, interest rate collar agreement, interest rate exchange agreement,
currency exchange agreement or any other agreement or arrangement designed to
protect against fluctuations in interest rates or currency values, including,
without limitation, any arrangement whereby, directly or indirectly, such
Person is entitled to receive from time to time periodic payments calculated by
applying either a fixed or floating rate of interest on a stated notional
amount in exchange for periodic payments made by such Person calculated by
applying a fixed or floating rate of interest on the same notional amount.

         "Junior Security" of any Person means any Qualified Capital Stock and
any Indebtedness of such Person that is subordinated in right of payment to the
Securities of each series then Outstanding and has no scheduled installment of
principal due, by redemption, sinking fund payment or otherwise, on or prior to
the latest Stated Maturity of the principal of any Outstanding Securities.





                                       5
<PAGE>   13
         "Last Sale Price" has the meaning specified in Section 1503.

         "Maturity", when used with respect to any Security, means the date on
which the principal of such Security or an installment of principal becomes due
and payable as therein or herein provided, whether at the Stated Maturity or by
declaration of acceleration, call for redemption or otherwise.

         The term "non-electing shares" has the meaning specified in Section
1505.

         "Officers' Certificate" means a certificate complying with the
provisions of Section 102 signed by the Chairman of the Board, the President or
a Vice President, and by the Treasurer, an Assistant Treasurer, the Controller,
the Secretary or an Assistant Secretary, of the Company, and delivered to the
Trustee.

         "Opinion of Counsel" means a written opinion of counsel, who may be an
employee of or counsel for the Company.

         "Original Issue Discount Security" means any Security which is issued
at a price lower than the principal amount payable upon the Stated Maturity
thereof and which provides for an amount less than such principal amount
thereof to be due and payable upon redemption thereof or upon a declaration of
acceleration of the Maturity thereof pursuant to Section 502.

         "Outstanding", when used with respect to Securities, means, as of the
date of determination, all Securities theretofore authenticated and delivered
under this Indenture, except:

                 (i)      Securities theretofore canceled by the Trustee or
         delivered to the Trustee for cancellation;

                 (ii)     Securities for whose payment or redemption money in
         the necessary amount has been theretofore deposited with the Trustee
         or any Paying Agent (other than the Company) in trust or set aside and
         segregated in trust by the Company (if the Company shall act as its
         own Paying Agent) for the Holders of such Securities and any coupons
         appertaining thereto, provided that, if such Securities are to be
         redeemed, notice of such redemption has been duly given pursuant to
         this Indenture or provision therefor satisfactory to the Trustee has
         been made;

                 (iii)    Securities which have been paid pursuant to Section
         306 or in exchange for or in lieu of which other Securities have been
         authenticated and delivered pursuant to this Indenture, other than any
         such Securities in respect of which there shall have been presented to
         the Trustee proof satisfactory to it that such Securities are held by
         a bona fide purchaser in whose hands such Securities are valid
         obligations of the Company; and

                 (iv)     Securities converted into Common Stock pursuant
         hereto and, for purposes of selection for redemption, Securities not
         deemed Outstanding pursuant to Section 1103.





                                       6
<PAGE>   14
provided, however, that in determining whether the Holders of the requisite
principal amount of the Outstanding Securities have given any request, demand,
authorization, direction, notice, consent or waiver hereunder or whether a
quorum is present at a meeting of Holders of Securities (i) the principal
amount of an Original Issue Discount Security that shall be deemed to be
Outstanding shall be the amount of the principal thereof that would be due and
payable as of the date of such determination upon acceleration of the Maturity
thereof pursuant to Section 502, (ii) the principal amount of a Security
denominated in a foreign currency or currencies, including composite
currencies, shall be the Dollar equivalent, determined on the date of original
issuance of such Security in the manner provided as contemplated by Section
301, of the principal amount (or, in the case of an Original Issue Discount
Security, the Dollar equivalent on the date of original issuance of such
Security of the amount determined as provided in (i) above) of such Security,
and (iii) Securities owned by the Company or any other obligor upon the
Securities or any Affiliate of the Company or of such other obligor shall be
disregarded and deemed not to be Outstanding, except that, in determining
whether the Trustee shall be protected in relying upon any such request,
demand, authorization, direction, notice, consent or waiver, or upon any such
determination as to the presence of a quorum, only Securities which the Trustee
knows to be so owned shall be so disregarded.  Securities so owned which have
been pledged in good faith may be regarded as Outstanding if the pledgee
establishes to the satisfaction of the Trustee the pledgee's right so to act
with respect to such Securities and that the pledgee is not the Company or any
other obligor upon the Securities or any Affiliate of the Company or of such
other obligor.

         "Paying Agent" means any Person authorized by the Company to pay the
principal of or any premium or interest on any Securities on behalf of the
Company.

         "Payment Blockage Period" has the meaning specified in Section 1601.

         "Payment Default" has the meaning specified in Section 1601.

         "Payment Notice" has the meaning specified in Section 1601.

         "Person" means any individual, corporation, partnership, joint
venture, trust, unincorporated organization or government or any agency or
political subdivision thereof.

         "Place of Payment", when used with respect to the Securities of any
series, means the place or places as specified in accordance with Section 301
where, subject to the provisions of Section 1002, the principal of and any
premium and interest on the Securities of that series are payable.

         "Predecessor Security" of any particular Security means every previous
Security evidencing all or a portion of the same debt as that evidenced by such
particular Security; and for the purposes of this definition, any Security
authenticated and delivered under Section 306 in exchange for or in lieu of a
mutilated, destroyed, lost or stolen Security or a Security to which a
mutilated, destroyed, lost or stolen coupon appertains shall be deemed to
evidence the same debt as the mutilated, destroyed, lost or stolen Security or
the Security to which the mutilated, destroyed, lost or stolen coupon
appertains, as the case may be.





                                       7
<PAGE>   15
         "Qualified Capital Stock" means any Capital Stock of the Company that
is not Disqualified Capital Stock.

         "Redemption Date", when used with respect to any Security to be
redeemed, means the date fixed for such redemption by or pursuant to this
Indenture.

         "Redemption Price", when used with respect to any Security to be
redeemed, means the price at which it is to be redeemed pursuant to this
Indenture.

         "Registered Security" means any Security in the form established
pursuant to Section 201 which is registered in the Security Register.

         "Regular Record Date" for the interest payable on any Interest Payment
Date on the Registered Securities of any series means the date specified for
that purpose as contemplated by Section 301.

         "Responsible Officer", when used with respect to the Trustee, shall
mean any officer in the corporate trust department (or any successor group) of
the Trustee, including any Vice President, any Trust Officer, or any other
officer of the Trustee customarily performing functions similar to those
performed by the persons who at the time shall be such officers, respectively,
or to whom any corporate trust matter is referred at the Corporate Trust Office
because of his or her knowledge of and familiarity with the particular subject.

         "Securities" has the meaning stated in the first recital of this
Indenture and more particularly means any Securities authenticated and
delivered under this Indenture.

         "Security Register" and "Security Registrar" have the respective
meanings specified in Section 305.

         "Senior Indebtedness" means Indebtedness of the Company, whether
outstanding on the date of this Indenture or thereafter created, incurred,
assumed, guaranteed or in effect guaranteed by the Company, unless the
instrument creating or evidencing such Indebtedness provides that such
Indebtedness is not senior or superior, in right of payment, to the Securities
or to other Indebtedness which is pari passu with, or subordinated to, the
Securities; provided, however, that in no event shall Senior Indebtedness
include (a) Indebtedness of the Company owed or owing to any Subsidiary of the
Company, (b) Indebtedness to trade creditors, (c) any liability for taxes owed
or owing by the Company and (d) the Securities.

         "Special Record Date" for the payment of any Defaulted Interest on the
Registered Securities of any series means a date fixed by the Trustee pursuant
to Section 307.

         "Stated Maturity", when used with respect to any Security or any
installment of principal thereof or interest thereon, means the date specified
in such Security or a coupon representing such





                                       8
<PAGE>   16
installment of interest as the fixed date on which the principal of such
Security or such installment of principal or interest is due and payable.

         "Subsidiary" with respect to any Person means (i) a corporation a
majority of whose Capital Stock with voting power normally entitled to vote in
the election of directors is at the time, directly or indirectly, owned by such
Person, by such Person and one or more Subsidiaries of such Person or by one or
more Subsidiaries of such Person, (ii) a partnership in which such Person or a
Subsidiary of such Person is, at the time, a general partner and owns alone or
together with one or more Subsidiaries of such Person a majority of the
partnership interests, or (iii) any other Person (other than a corporation) in
which such Person, one or more Subsidiaries of such Person, or such Person and
one or more Subsidiaries of such Person, directly or indirectly, at the date of
determination thereof has at least majority ownership interest.

     "Subsidiary Guarantee" means a full and unconditional guarantee by a
Subsidiary Guarantor of the obligations of the Company with respect to the
Securities of a series, which guarantee shall be on the basis, and subject to
the terms and conditions, as may be specified as contemplated by Section 301 in
connection with the issuance of the Securities of such series.

         "Subsidiary Guarantor" means each of (i) the Persons so identified on
the signature page of this Indenture or any indenture supplemental hereto who,
pursuant to the terms of any series of Securities, are to provide a Subsidiary
Guarantee with respect to that series of Securities, (ii) any other Person that
executes a Subsidiary Guarantee with respect to a series of Securities in
accordance with the provisions thereof and (iii) their respective successors
and assigns, to the extent specified in the Subsidiary Guarantees.

         "Trading Day" has the meaning specified in Section 1503.

         "Trustee" means the Person named as the "Trustee" in the first
paragraph of this Indenture until a successor Trustee shall have become such
pursuant to the applicable provisions of this Indenture, and thereafter
"Trustee" shall mean or include each Person who is then a Trustee hereunder,
and if at any time there is more than one such Person, "Trustee" as used with
respect to the Securities of any series shall mean the Trustee with respect to
Securities of that series.

         "Trust Indenture Act" means the Trust Indenture Act of 1939 as in
force at the date as of which this Indenture was executed; provided, however,
that in the event the Trust Indenture Act of 1939 is amended after such date,
"Trust Indenture Act" means, to the extent required by any such amendment, the
Trust Indenture Act of 1939 as so amended.

         "United States" means the United States of America (including the
States and the District of Columbia), its territories, its possessions and
other areas subject to its jurisdiction.

         "United States Alien" means any Person who, for United States Federal
income tax purposes, is a foreign corporation, a non-resident alien individual,
a non-resident alien fiduciary of a foreign estate or trust, or a foreign
partnership one or more of the members of which is, for United States





                                       9
<PAGE>   17
Federal income tax purposes, a foreign corporation, a non-resident alien
individual or a non-resident alien fiduciary of a foreign estate or trust.

         "U.S. Government Obligations" has the meaning specified in Section
1304.

         "Vice President", when used with respect to the Company or the
Trustee, means any vice president, whether or not designated by a number or a
word or words added before or after the title "vice president".

SECTION 102.  Compliance Certificates and Opinions.

         Upon any application or request by the Company to the Trustee to take
any action under any provision of this Indenture, the Company shall furnish to
the Trustee such certificates and opinions as may be required under the Trust
Indenture Act.  Each such certificate or opinion shall be given in the form of
an Officers' Certificate, if to be given by an officer of the Company, or an
Opinion of Counsel, if to be given by counsel, and shall comply with the
requirements of the Trust Indenture Act and any other requirements set forth in
this Indenture.

SECTION 103.  Form of Documents Delivered to Trustee.

         In any case where several matters are required to be certified by, or
covered by an opinion of, any specified Person, it is not necessary that all
such matters be certified by, or covered by the opinion of, only one such
Person, or that they be so certified or covered by only one document, but one
such Person may certify or give an opinion with respect to some matters and one
or more other such Persons as to other matters, and any such Person may certify
or give an opinion as to such matters in one or several documents.

         Any certificate or opinion of an officer of the Company may be based,
insofar as it relates to legal matters, upon a certificate or opinion of, or
representations by, counsel, unless such officer knows, or in the exercise of
reasonable care should know, that the certificate or opinion or representations
with respect to the matters upon which his certificate or opinion is based are
erroneous.  Any such certificate or Opinion of Counsel may be based, insofar as
it relates to factual matters, upon a certificate or opinion of, or
representations by, an officer or officers of the Company stating that the
information with respect to such factual matters is in the possession of the
Company, unless such counsel knows, or in the exercise of reasonable care
should know, that the certificate or opinion or representations with respect to
such matters are erroneous.

         Where any Person is required to make, give or execute two or more
applications, requests, consents, certificates, statements, opinions or other
instruments under this Indenture, they may, but need not, be consolidated and
form one instrument.





                                       10
<PAGE>   18
SECTION 104.  Acts of Holders.

         (a)     Any request, demand, authorization, direction, notice,
consent, waiver or other action provided by this Indenture to be given or taken
by Holders may be embodied in and evidenced by one or more instruments of
substantially similar tenor signed by such Holders in person or by an agent
duly appointed in writing.  If Securities of a series are issuable as Bearer
Securities, any request, demand, authorization, direction, notice, consent,
waiver or other action provided by this Indenture to be given or taken by
Holders of such series may, alternatively, be embodied in and evidenced by the
record of Holders of Securities of such series voting in favor thereof, either
in person or by proxies duly appointed in writing, at any meeting of Holders of
Securities of such series duly called and held in accordance with the
provisions of Article Fourteen, or a combination of such instruments and any
such record.  Except as herein otherwise expressly provided, such action shall
become effective when such instrument or instruments or record or both are
delivered to the Trustee and, where it is hereby expressly required, to the
Company.  Such instrument or instruments and any such record (and the action
embodied therein and evidenced thereby) are herein sometimes referred to as the
"Act" of the Holders signing such instrument or instruments and so voting at
any such meeting.  Proof of execution of any such instrument or of a writing
appointing any such agent or proxy or of the holding by any Person of a
Security, shall be sufficient for any purpose of this Indenture and (subject to
Section 601) conclusive in favor of the Trustee and the Company, if made in the
manner provided in this Section.  The record of any meeting of Holders of
Securities shall be proved in the manner provided in Section 1406.

         (b)     The fact and date of the execution by any Person of any such
instrument or writing may be proved by the affidavit of a witness of such
execution or by a certificate of a notary public or other officer authorized by
law to take acknowledgments of deeds, certifying that the individual signing
such instrument or writing acknowledged to him the execution thereof.  Where
such execution is by a signer acting in a capacity other than his individual
capacity, such certificate or affidavit shall also constitute sufficient proof
of his authority.  The fact and date of the execution of any such instrument or
writing, or the authority of the Person executing the same, may also be proved
in any other manner which the Trustee deems sufficient.

         (c)     The Company may, in the circumstances permitted by the Trust
Indenture Act, fix any day as the record date for the purpose of determining
the Holders of Registered Securities of any series entitled to give or take any
request, demand, authorization, direction, notice, consent, waiver or other
action, or to vote on any action, authorized or permitted to be given or taken
by Holders of Securities of such series.  If not set by the Company prior to
the first solicitation of a Holder of Securities of such series made by any
Person in respect of any such action, or, in the case of any such vote, prior
to such vote, the record date for any such action or vote shall be the 30th day
(or, if later, the date of the most recent list of Holders required to be
provided pursuant to Section 701) prior to such first solicitation or vote, as
the case may be.  With regard to any record date for action to be taken by the
Holders of one or more series of Securities, only the Holders of Securities of
such series on such date (or their duly designated proxies) shall be entitled
to give or take, or vote on, the relevant action.





                                       11
<PAGE>   19
         (d)     The principal amount and serial numbers of Registered
Securities held by any Person, and the date of holding the same, shall be
proved by the Security Register.

         (e)     The principal amount and serial numbers of Bearer Securities
held by any Person, and the date of holding the same, may be proved by the
production of such Bearer Securities or by a certificate executed, as
depositary, by any trust company, bank, banker or other depositary, wherever
situated, if such certificate shall be deemed by the Trustee to be
satisfactory, showing that at the date therein mentioned such Person had on
deposit with such depositary, or exhibited to it, the Bearer Securities therein
described; or such facts may be proved by the certificate or affidavit of the
Person holding such Bearer Securities, if such certificate or affidavit is
deemed by the Trustee to be satisfactory.  The Trustee and the Company may
assume that such ownership of any Bearer Security continues until (1) another
certificate or affidavit bearing a later date issued in respect of the same
Bearer Security is produced, or (2) such Bearer Security is produced to the
Trustee by some other Person, or (3) such Bearer Security is surrendered in
exchange for a Registered Security, or (4) such Bearer Security is no longer
Outstanding.  The principal amount and serial numbers of Bearer Securities held
by any Person, and the date of holding the same, may also be proved in any
other manner which the Trustee deems sufficient.

         (f)     Any request, demand, authorization, direction, notice,
consent, waiver or other Act of the Holder of any Security shall bind every
future Holder of the same Security and the Holder of every Security issued upon
the registration of transfer thereof or in exchange therefor or in lieu thereof
in respect of anything done, omitted or suffered to be done by the Trustee or
the Company in reliance thereon, whether or not notation of such action is made
upon such Security.

         (g)     Without limiting the foregoing, a Holder entitled hereunder to
give or take any action hereunder with regard to any particular Security may do
so with regard to all or any part of the principal amount of such Security or
by one or more duly appointed agents each of which may do so pursuant to such
appointment with regard to all or any different part of such principal amount.

SECTION 105.  Notices, Etc., to Trustee, Company and Subsidiary Guarantors.

         Any request, demand, authorization, direction, notice, consent, waiver
or Act of Holders or other document provided or permitted by this Indenture to
be made upon, given or furnished to, or filed with,

                 (1)      the Trustee by any Holder or by the Company or any
         Subsidiary Guarantor shall be sufficient for every purpose hereunder
         if made, given, furnished or filed in writing to or with and received
         by the Trustee at its Corporate Trust Office in Dallas, Texas or
         Houston, Texas, as applicable, or,

                 (2)      the Company or any Subsidiary Guarantor by the
         Trustee or by any Holder shall be sufficient for every purpose
         hereunder (unless otherwise herein expressly provided) if in writing
         and mailed, first-class postage prepaid, to the Company addressed to
         it at the address of its principal office specified in the first
         paragraph of this Indenture, to the attention





                                       12
<PAGE>   20
         of its Treasurer, or at any other address previously furnished in
         writing to the Trustee by the Company.

SECTION 106.  Notice to Holders of Securities; Waiver.

         Except as otherwise expressly provided herein, where this Indenture
provides for notice to Holders of Securities of any event,

                 (1)      such notice shall be sufficiently given to Holders of
         Registered Securities if in writing and mailed, first-class postage
         prepaid, to each Holder of a Registered Security affected by such
         event, at the address of such Holder as it appears in the Security
         Register, not later than the latest date, and not earlier than the
         earliest date, prescribed for the giving of such notice; and

                 (2)      such notice shall be sufficiently given to Holders of
         Bearer Securities if published in an Authorized Newspaper in The City
         of New York and in such other city or cities as may be specified in
         such Securities on a Business Day at least twice, the first such
         publication to be not earlier than the earliest date, and not later
         than the latest date, prescribed for the giving of such notice.

         In case by reason of the suspension of regular mail service or by
reason of any other cause it shall be impracticable to give such notice to
Holders of Registered Securities by mail, then such notification as shall be
made with the approval of the Trustee shall constitute sufficient notice to
such Holders for every purpose hereunder.  In any case where notice to Holders
of Registered Securities is given by mail, neither the failure to mail such
notice, nor any defect in any notice so mailed, to any particular Holder of a
Registered Security shall affect the sufficiency of such notice with respect to
other Holders of Registered Securities or the sufficiency of any notice to
Holders of Bearer Securities given as provided herein.

         In case by the reason of the suspension of publication of any
Authorized Newspaper or Authorized Newspapers or by reason of any other cause
it shall be impracticable to publish any notice to Holders of Bearer Securities
as provided above, then such notification to Holders of Bearer Securities as
shall be given with the approval of the Trustee shall constitute sufficient
notice to such Holders for every purpose hereunder.  Neither the failure to
give notice by publication to Holders of Bearer Securities as provided above,
nor any defect in any notice so published, shall affect the sufficiency of any
notice to Holders of Registered Securities given as provided herein.

         Where this Indenture provides for notice in any manner, such notice
may be waived in writing by the Person entitled to receive such notice, either
before or after the event, and such waiver shall be the equivalent of such
notice.  Waivers of notice by Holders of Securities shall be filed with the
Trustee, but such filing shall not be a condition precedent to the validity of
any action taken in reliance upon such waiver.





                                       13
<PAGE>   21
SECTION 107.  Language of Notices, Etc.

         Any request, demand, authorization, direction, notice, consent or
waiver required or permitted under this Indenture shall be in the English
language, except that any published notice may be in an official language of
the country of publication.

SECTION 108.  Conflict with Trust Indenture Act.

         If any provision hereof limits, qualifies or conflicts with a
provision of the Trust Indenture Act that is required under such Act to be a
part of and govern this Indenture, the latter provision shall control.  If any
provision of this Indenture modifies or excludes any provision of the Trust
Indenture Act that may be so modified or excluded, the latter provision shall
be deemed to apply to this Indenture as so modified or to be excluded, as the
case may be.

SECTION 109.  Effect of Headings and Table of Contents.

         The Article and Section headings herein and the Table of Contents are
for convenience only and shall not affect the construction hereof.

SECTION 110.  Successors and Assigns.

         All covenants and agreements in this Indenture by the Company or any
Subsidiary Guarantor shall bind its successors and assigns, whether so
expressed or not.

SECTION 111.  Separability Clause.

         In case any provision in this Indenture or the Securities or coupons
shall be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or
impaired thereby.

SECTION 112.  Benefits of Indenture.

         Nothing in this Indenture or the Securities or coupons, express or
implied, shall give to any Person, other than the parties hereto, their
successors hereunder, the holders of Senior Indebtedness  and the Holders of
Securities and coupons, any benefit or any legal or equitable right, remedy or
claim under this Indenture.

SECTION 113.  Governing Law.

         This Indenture, any Subsidiary Guarantees and the Securities and
coupons shall be governed by and construed in accordance with the laws of the
State of New York.





                                       14
<PAGE>   22
SECTION 114.  Legal Holidays.

         In any case where any Interest Payment Date, Redemption Date or Stated
Maturity of any Security or the last date for conversion of any Security shall
not be a Business Day at any Place of Payment, then (notwithstanding any other
provision of this Indenture or of the Securities or coupons other than a
provision in the Securities of any series which specifically states that such
provision shall apply in lieu of this Section) payment of interest or principal
(and premium, if any) need not be made at such Place of Payment on such date
and such conversion need not be made at such Place of Payment on such date, but
may be made on the next succeeding Business Day at such Place of Payment with
the same force and effect as if made on the Interest Payment Date or Redemption
Date, or at the Stated Maturity, or on the last date for conversion, as the
case may be, provided that no interest shall accrue on the amount so payable
for the period from and after such date.

SECTION 115.  Partners, Incorporators, Stockholders, Officers and Directors of
              Issuer and the Trustee Exempt from Individual Liability.

         No recourse under or upon any obligation, covenant or agreement
contained in this Indenture, or in any Security, or because of any indebtedness
evidenced thereby, shall be had against any incorporator, as such or against
any past, present or future stockholder, officer or director, as such, of the
Issuer or the Trustee, or any partner of the Issuer or the Trustee, or of any
successor, either directly or through the Issuer or the Trustee, or any
successor, under any rule of law, statute or constitutional provision or by the
enforcement of any assessment or by any legal or equitable proceeding or
otherwise, all such liability being expressly waived and released by the
acceptance of the Securities by the Holders thereof and as part of the
consideration for the issue of the Securities.

SECTION 116.  Counterparts

         This Indenture may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.

                                  ARTICLE TWO
                                 SECURITY FORMS

SECTION 201.  Forms Generally.

         The Registered Securities, if any, of each series and the Bearer
Securities, if any, of each series and related coupons and notations of any
Subsidiary Guarantees shall be in substantially the form (including temporary
or permanent global form) as shall be established by or pursuant to a Board
Resolution or in one or more indentures supplemental hereto, in each case with
such appropriate insertions, omissions, substitutions and other variations as
are required or permitted by this Indenture, and may have such letters, numbers
or other marks of identification and such legends or endorsements placed
thereon as may be required to comply with law, or with the rules of any
securities exchange or to conform to general usage, all as may, consistently
herewith, be determined





                                       15
<PAGE>   23
by the officers executing such Securities or coupons, as evidenced by their
execution of the Securities or coupons.  If temporary Securities of any series
are issued in global form as permitted by Section 304, the form thereof shall
be established as provided in the preceding sentence.  A copy of the Board
Resolution establishing the forms of Securities or coupons of any series (or
any such temporary global Security) shall be certified by the Secretary or an
Assistant Secretary of the Company and delivered to the Trustee at or prior to
the delivery of the Company Order contemplated by Section 303 for the
authentication and delivery of such Securities (or any such temporary global
Security) or coupons.

         Unless otherwise specified as contemplated by Section 301, Securities
in bearer form shall have interest coupons attached.

         The definitive Securities and coupons, if any, shall be printed,
lithographed or engraved on steel engraved borders or may be produced in any
other manner, all as determined by the officers executing such Securities, as
evidenced by their execution of such Securities or coupons.

SECTION 202.  Form of Trustee's Certificate of Authentication.

         The Trustee's certificate of authentication shall be in substantially
the following form:

         "This is one of the Securities of the series designated therein
referred to in the within-mentioned Indenture.

                                    Chase Bank of Texas, National Association
                                            as Trustee


                                    By:   
                                       -----------------------------------
                                              Authorized Signatory."


SECTION 203.  Securities in Global Form.

         If Securities of a series are issuable in global form, as specified as
contemplated by Section 301, then, notwithstanding clause (10) of Section 301
and the provisions of Section 302, any such Security shall represent such of
the Outstanding Securities of such series as shall be specified therein and may
provide that it shall represent the aggregate amount of Outstanding Securities
from time to time endorsed thereon and that the aggregate amount of Outstanding
Securities represented thereby may be reduced to reflect exchanges.  Any
endorsement of a Security in global form to reflect the amount, or any increase
or decrease in the amount, of Outstanding Securities represented thereby shall
be made by the Trustee in such manner and upon instructions given by such
Person or Persons as shall be specified therein or in the Company Order to be
delivered to the Trustee pursuant to Section 303 or Section 304.  Subject to
the provisions of Section 303 and, if applicable, Section 304, the Trustee
shall deliver and redeliver any Security in permanent global form in the manner
and upon instructions given by the Person or Persons specified therein or in
the applicable Company





                                       16
<PAGE>   24
Order.  If a Company Order pursuant to Section 303 or 304 has been, or
simultaneously is, delivered, any instructions by the Company with respect to
endorsement or delivery or redelivery of a Security in global form shall be in
writing but need not comply with Section 102 and need not be accompanied by an
Opinion of Counsel.

         The provisions of the last sentence of Section 303 shall apply to any
Security represented by a Security in global form if such Security was never
issued and sold by the Company and the Company delivers to the Trustee the
Security in global form together with written instructions (which need not
comply with Section 102 and need not be accompanied by an Opinion of Counsel)
with regard to the reduction in the principal amount of Securities represented
thereby, together with the written statement contemplated by the last sentence
of Section 303.

         Notwithstanding the provisions of Sections 201 and 307, unless
otherwise specified as contemplated by Section 301, payment of principal of and
any premium and interest on any Security in permanent global form shall be made
to the Person or Persons specified therein.

SECTION 204.  Form of Legend for Book-Entry Securities.

         Any Book-Entry Security authenticated and delivered hereunder shall
bear a legend in substantially the following form:

         "This Security is a Book-Entry Security within the meaning of the
Indenture hereinafter referred to and is registered in the name of a Depository
or a nominee of a Depository.  This Security is exchangeable for Securities
registered in the name of a Person other than the Depository or its nominee
only in the limited circumstances described in the Indenture, and no transfer
of this Security (other than a transfer of this Security as a whole by the
Depository to a nominee of the Depository or by a nominee of the Depository to
the Depository or another nominee of the Depository) may be registered except
in such limited circumstances."

                                 ARTICLE THREE
                                 THE SECURITIES

SECTION 301.  Amount Unlimited; Issuable in Series.

         The aggregate principal amount of Securities which may be
authenticated and delivered under this Indenture is unlimited.

         The Securities may be issued in one or more series, and each such
series shall rank equally and pari passu with each other series as to right of
payment of principal and any premium and interest thereon, but all Securities
issued hereunder shall be subordinate and junior in right of payment, to the
extent and in the manner set forth in Article Sixteen (as such provisions may
be modified in accordance with clause (19) of this Section 301), to all Senior
Indebtedness.  There shall be established in or pursuant to a Board Resolution
and, subject to Section 303, set forth, or





                                       17
<PAGE>   25
determined in the manner provided, in an Officers' Certificate, or established
in one or more indentures supplemental hereto, prior to the issuance of
Securities of any series:

                 (1)      the title of the Securities of the series (which
         shall distinguish the Securities of the series from all other
         Securities);

                 (2)      any limit upon the aggregate principal amount of the
         Securities of the series which may be authenticated and delivered
         under this Indenture (except for Securities authenticated and
         delivered upon registration of transfer of, or in exchange for, or in
         lieu of, other Securities of the series pursuant to Section 304, 305,
         306, 906 or 1107 and except for any Securities which, pursuant to
         Section 303, are deemed never to have been authenticated and delivered
         hereunder);

                 (3)      whether Securities of the series are to be issuable
         as Registered Securities, Bearer Securities or both, whether any
         Securities of the series are to be issuable initially in temporary
         global form and whether any Securities of the series are to be
         issuable in permanent global form with or without coupons and, if so,
         whether beneficial owners of interests in any such permanent global
         Security may exchange such interests for Securities of such series and
         of like tenor of any authorized form and denomination and the
         circumstances under which any such exchanges may occur, if other than
         in the manner provided in Section 305;

                 (4)      the Person to whom any interest on any Registered
         Security of the series shall be payable, if other than the Person in
         whose name that Security (or one or more Predecessor Securities) is
         registered at the close of business on the Regular Record Date for
         such interest, the manner in which, or the Person to whom, any
         interest on any Bearer Security of the series shall be payable, if
         otherwise than upon presentation and surrender of the coupons
         appertaining thereto as they severally mature and the extent to which,
         or the manner in which, any interest payable on a temporary global
         Security on an Interest Payment Date will be paid if other than in the
         manner provided in Section 304;

                 (5)      the date or dates on which the principal of the
         Securities of the series is payable;

                 (6)      the rate or rates at which the Securities of the
         series shall bear interest, if any, or the method by which such rate
         or rates shall be determined, the date or dates from which any such
         interest shall accrue, the Interest Payment Dates on which any such
         interest shall be payable, and the Regular Record Date for any
         interest payable on any Registered Securities on any Interest Payment
         Date and whether, and under what circumstances, additional amounts
         with respect to such Securities shall be payable as set forth in
         Section 1004;

                 (7)      the place or places where, subject to the provisions
         of Section 1002, the principal of and any premium and interest on
         Securities of the series shall be payable, any





                                       18
<PAGE>   26
         Registered Securities of the series may be surrendered for
         registration of transfer, Securities of the series may be surrendered
         for exchange or conversion and notices and demands to or upon the
         Company in respect of the Securities of the series and this Indenture
         may be served;

                 (8)      the right, if any, of the Company to redeem
         Securities of the series, in whole or in part, at its option and the
         period or periods within which, the price or prices at which and the
         terms and conditions upon which Securities of the series may be so
         redeemed;

                 (9)      the obligation, if any, of the Company to redeem,
         purchase, or repay Securities of the series pursuant to any mandatory
         redemption, sinking fund or analogous provisions or at the option of a
         Holder thereof and the period or periods within which, the price or
         prices at which and the terms and conditions upon which Securities of
         the series shall be redeemed, purchased or repaid, in whole or in
         part, pursuant to such obligation;

                 (10)     the denominations in which any Registered Securities
         of the series shall be issuable, if other than denominations of $1,000
         and any integral multiple thereof, and the denomination or
         denominations in which any Bearer Securities of the series shall be
         issuable, if other than the denomination of $5,000;

                 (11)     the currency or currencies, including composite
         currencies, in which payment of the principal of and any premium and
         interest on any Securities of the series shall be payable if other
         than the currency of the United States of America and the manner of
         determining the equivalent thereof in the currency of the United
         States of America for purposes of the definition of "Outstanding" in
         Section 101;

                 (12)     if the amount of payments of principal of and any
         premium or interest on any Securities of the series may be determined
         with reference to an index, the manner in which such amounts shall be
         determined;

                 (13)     if other than the principal amount thereof, the
         portion of the principal amount of any Securities of the series which
         shall be payable upon declaration of acceleration of the Maturity
         thereof pursuant to Section 502;

                 (14)     if the principal of and any premium or interest on
         the Securities of the series are to be payable, at the election of the
         Company or a Holder thereof, in a currency or currencies, including
         composite currencies, other than that or those in which the Securities
         are stated to be payable, the currency or currencies in which payment
         of the principal of and any premium and interest on Securities of such
         series as to which such election is made shall be payable, and the
         periods within which and the terms and conditions upon which such
         election is to be made;

                 (15)     whether the Securities of the series shall be issued
         upon original issuance in whole or in part in the form of one or more
         Book-Entry Securities and, in such case, (a) the Depository with
         respect to such Book-Entry Security or Securities; and (b) the
         circumstances





                                       19
<PAGE>   27
         under which any such Book-Entry Security may be exchanged for
         Securities registered in the name of, and any transfer of such
         Book-Entry Security may be registered to, a Person other than such
         Depository or its nominee, if other than as set forth in Section 305;

                 (16)     if either or both of the provisions of Section 1302
         or 1303 are applicable to the Securities of such series and any
         additional means of discharge pursuant to Section 1302 or 1303 and any
         additional conditions to the provisions of Section 1302 or 1303;

                 (17)     any deletions from, modifications of or additions to
         any Events of Default or covenants with respect to the Securities of
         such series;

                 (18)     whether the Securities of the series will be
         convertible into Common Stock (or cash in lieu thereof) and, if so,
         the terms and conditions upon which such conversion will be effected
         including the initial Conversion Price and any adjustments thereto,
         the conversion period and other provisions in addition to or in lieu
         of those set forth herein;

                 (19)     any subordination provisions with respect to the
         Securities of such series (and any related Subsidiary Guarantees) in
         addition to or in lieu of those set forth in Article Sixteen hereof;

                 (20)     whether the Securities of the series shall be
         guaranteed by one or more Subsidiary Guarantors and, if so, the terms
         of the Subsidiary Guarantees, including the circumstances in which
         such Subsidiary Guarantees may be released; and

                 (21)     any other terms of the series (which terms shall not
         be inconsistent with the provisions of this Indenture except as
         permitted by Section 901(5)).

         All Securities of any one series and the coupons appertaining to any
Bearer Securities of such series shall be substantially identical except, in
the case of Registered Securities, as to denomination and except as may
otherwise be provided in or pursuant to the Board Resolution referred to above
and (subject to Section 303) set forth, or determined in the manner provided,
in the Officers' Certificate referred to above or in any such indenture
supplemental hereto.

         If any of the terms of the series are established by action taken
pursuant to a Board Resolution, a copy of an appropriate record of such action
shall be certified by the Secretary or an Assistant Secretary of the Company
and delivered to the Trustee at or prior to the delivery of the Officers'
Certificate setting forth the terms of the series.

SECTION 302.  Denominations.

         Unless otherwise provided as contemplated by Section 301 with respect
to any series of Securities, any Registered Securities of a series shall be
issuable in denominations of $1,000 and any integral multiple thereof and any
Bearer Securities of a series shall be issuable in the denomination of $5,000.





                                       20
<PAGE>   28
SECTION 303.  Execution, Authentication, Delivery and Dating.

         The Securities shall be executed on behalf of the Company by its
Chairman of the Board, its President, its Treasurer, its Controller or its
Chief Financial Officer, under its corporate seal reproduced thereon attested
by its Secretary or one of its Assistant Secretaries.  The signature of any of
these officers on the Securities may be manual or facsimile.  Coupons shall
bear the facsimile signature of the Treasurer or any Assistant Treasurer of the
Company.

         Securities and coupons bearing the manual or facsimile signatures of
individuals who were at any time the proper officers of the Company shall bind
the Company, notwithstanding that such individuals or any of them have ceased
to hold such offices prior to the authentication and delivery of such
Securities or did not hold such offices at the date of such Securities.

         At any time and from time to time after the execution and delivery of
this Indenture, the Company may deliver Securities of any series, together with
any coupons appertaining thereto, executed by the Company to the Trustee for
authentication, together with a Company Order for the authentication and
delivery of such Securities, and the Trustee in accordance with the Company
Order shall authenticate and deliver such Securities; provided, however, that,
unless otherwise provided with respect to such series, in connection with its
original issuance, no Bearer Security shall be mailed or otherwise delivered to
any location in the United States; and provided, further, that, unless
otherwise provided with respect to such series, a Bearer Security may be
delivered in connection with its original issuance only if the Person entitled
to receive such Bearer Security shall have furnished a certificate in the form
set forth in Exhibit A to this Indenture, dated no earlier than the
Certification Date.  If any Security shall be represented by a permanent global
Bearer Security, then, for purposes of this Section and Section 304, the
notation of a beneficial owner's interest therein upon original issuance of
such Security or upon exchange of a portion of a temporary global Security
shall be deemed to be delivery in connection with its original issuance of such
beneficial owner's interest in such permanent global Security.  Except as
permitted by Section 306, the Trustee shall not authenticate and deliver any
Bearer Security unless all appurtenant coupons for interest then matured have
been detached and canceled.

         In authenticating Securities, the Trustee shall be entitled to
receive, and (subject to Section 601) shall be fully protected in relying upon,
an Opinion of Counsel stating:

                 (a)      that the forms of such Securities and coupons
         established by or pursuant to a Board Resolution as contemplated by
         Section 201 have been established in conformity with the provisions of
         this Indenture;

                 (b)      if the terms of such Securities and any coupons have
         been established by or pursuant to a Board Resolution as permitted by
         Section 301, that such terms have been established in conformity with
         the provisions of this Indenture; and

                 (c)      that such Securities, together with any coupons
         appertaining thereto, when authenticated and delivered by the Trustee
         and issued by the Company in the manner and





                                       21
<PAGE>   29
         subject to any conditions specified in such Opinion of Counsel, will
         constitute valid and legally binding obligations of the Company
         enforceable in accordance with their terms, subject to bankruptcy,
         insolvency, fraudulent transfer, reorganization and other laws of
         general applicability relating to or affecting creditors' rights and
         to general equity principles.

Such Opinion of Counsel shall also cover such other matters as the Trustee may
reasonably request.

         The Trustee shall not be required to authenticate such Securities the
forms or terms of which have been established by or pursuant to a Board
Resolution if the issue of such Securities pursuant to this Indenture will
affect the Trustee's own rights, duties or immunities under the Securities and
this Indenture or otherwise in a manner which is not reasonably acceptable to
the Trustee.

         Notwithstanding the provisions of Section 301 and of the two preceding
paragraphs, if all Securities of a series are not to be originally issued at
one time, it shall not be necessary to deliver the Officers' Certificate
otherwise required pursuant to Section 301 or the Company Order and Opinion of
Counsel otherwise required pursuant to such preceding paragraphs at or prior to
the time of authentication of each Security of such series if such documents
are delivered at or prior to the authentication upon issuance of the first
Security of such series to be issued.

         After the original issuance of the first Security of such series to be
issued, any separate request by the Company that the Trustee authenticate
Securities of such series for original issuance will be deemed to be a
certification by the Company (which, subject to Section 601, the Trustee shall
be fully protected in relying on) that it is in compliance with all conditions
precedent provided for in this Indenture relating to the authentication and
delivery of such Securities.

         Each Registered Security shall be dated the date of its
authentication; and each Bearer Security shall be dated as of the date of
original issuance of the first Security of such series to be issued.

         No Security or coupon shall be entitled to any benefit under this
Indenture or be valid or obligatory for any purpose unless there appears on
such Security, or the Security to which such coupon appertains, a certificate
of authentication substantially in the form provided for herein executed by the
Trustee by manual signature, and such certificate upon any Security shall be
conclusive evidence, and the only evidence, that such Security has been duly
authenticated and delivered hereunder.  Notwithstanding the foregoing, if any
Security shall have been authenticated and delivered hereunder but never issued
and sold by the Company, and the Company shall deliver such Security to the
Trustee for cancellation as provided in Section 309 together with a written
statement (which need not comply with Section 102 and need not be accompanied
by an Opinion of Counsel) stating that such Security has never been issued and
sold by the Company, for all purposes of this Indenture such Security shall be
deemed never to have been authenticated and delivered hereunder and shall never
be entitled to the benefits of this Indenture.





                                       22
<PAGE>   30
SECTION 304.  Temporary Securities.

         Pending the preparation of definitive Securities of any series, the
Company may execute, and upon Company Order the Trustee shall authenticate and
deliver, temporary Securities which are printed, lithographed, typewritten or
otherwise produced, in any authorized denomination, substantially of the tenor
of the definitive Securities in lieu of which they are issued, in registered
form or, if authorized, in bearer form with one or more coupons or without
coupons, and with such appropriate insertions, omissions, substitutions and
other variations as the officers executing such Securities may determine, as
evidenced by their execution of such Securities.  In the case of any series
issuable as Bearer Securities, such temporary Securities may be in global form.
A temporary Bearer Security shall be delivered only in compliance with the
conditions set forth in Section 303.

         Except in the case of temporary Securities in global form (which shall
be exchanged in accordance with the provisions of the following paragraphs), if
temporary Securities of any series are issued, the Company will cause
definitive Securities of that series to be prepared without unreasonable delay.
After the preparation of definitive Securities of such series, the temporary
Securities of such series shall be exchangeable for definitive Securities of
such series upon surrender of the temporary Securities of such series at the
office or agency of the Company maintained pursuant to Section 1002 in a Place
of Payment for such series for the purpose of exchanges of Securities of such
series without charge to the Holder.  Upon surrender for cancellation of any
one or more temporary Securities of any series (accompanied by any unmatured
coupons appertaining thereto) the Company shall execute and the Trustee shall
authenticate and deliver in exchange therefor a like aggregate principal amount
of definitive Securities of the same series and of like tenor of authorized
denominations; provided, however, that no definitive Bearer Security shall be
issued in exchange for a temporary Registered Security.

         If temporary Securities of any series are issued in global form, any
such temporary global Security shall, unless otherwise provided therein, be
delivered to the London office of a depositary or common depositary (the
"Common Depositary"), for the benefit of Euro-clear and CEDEL S.A., for credit
to the respective accounts of the beneficial owners of such Securities (or to
such other accounts as they may direct).

         Without unnecessary delay but in any event not later than the date
specified in, or determined pursuant to the terms of, any such temporary global
Security of a series (the "Exchange Date"), the Company shall deliver to the
Trustee definitive Securities of that series in aggregate principal amount
equal to the principal amount of such temporary global Security, executed by
the Company.  On or after the Exchange Date such temporary global Security
shall be surrendered by the Common Depositary to the Trustee, as the Company's
agent for such purpose, to be exchanged, in whole or from time to time in part,
for definitive Securities of that series without charge and the Trustee shall
authenticate and deliver, in exchange for each portion of such temporary global
Security, a like aggregate principal amount of definitive Securities of the
same series of authorized denominations and of like tenor as the portion of
such temporary global Security to be exchanged; provided, however, that, unless
otherwise specified in such temporary global Security, upon such presentation
by the Common Depositary, such temporary global Security is accompanied by a
certificate dated





                                       23
<PAGE>   31
the Exchange Date or a subsequent date and signed by Euro-clear as to the
portion of such temporary global Security held for its account then to be
exchanged and a certificate dated the Exchange Date or a subsequent date and
signed by CEDEL S.A. as to the portion of such temporary global Security held
for its account then to be exchanged, each in the form set forth in Exhibit B
to this Indenture.  The definitive Securities to be delivered in exchange for
any such temporary global Security shall be in bearer form, registered form,
permanent global bearer form or permanent global registered form, or any
combination thereof, as specified as contemplated by Section 301, and if any
combination thereof is so specified, as requested by the beneficial owner
thereof; provided, however, that no definitive Bearer Security or permanent
global Security shall be delivered in exchange for a temporary Bearer Security
except in compliance with the conditions set forth in Section 303.

         Unless otherwise specified in the temporary global Security, the
interest of a beneficial owner of Securities of a series in a temporary global
Security shall be exchanged on the Exchange Date for definitive Securities (and
where the form of the definitive Securities is not specified by the Holder for
an interest in a permanent global Security) of the same series and of like
tenor unless, on or prior to the Exchange Date, such beneficial owner has not
delivered to Euro-clear or CEDEL S.A., as the case may be, a certificate in the
form set forth in Exhibit A to this Indenture dated no earlier than the
Certification Date, copies of which certificate shall be available from the
offices of Euro-clear and CEDEL S.A., the Trustee, any Authenticating Agent
appointed for such series of Securities and each Paying Agent and after the
Exchange Date, the interest of a beneficial owner of Securities of a series in
a temporary global Security shall be exchanged for definitive Securities (and
where the form of the definitive Securities is not specified by the Holder for
an interest in a permanent global Security) of the same series and of like
tenor following such beneficial owner's delivery to Euro-clear or CEDEL S.A.,
as the case may be, of a certificate in the form set forth in Exhibit A to this
Indenture dated no earlier than the Certification Date.  Unless otherwise
specified in such temporary global Security, any exchange shall be made free of
charge to the beneficial owners of such temporary global Security, except that
a Person receiving definitive Securities must bear the cost of insurance,
postage, transportation and the like in the event that such Person does not
take delivery of such definitive Securities in person at the offices of
Euro-clear or CEDEL S.A. Definitive Securities in bearer form to be delivered
in exchange for any portion of a temporary global Security shall be delivered
only outside the United States.

         Until exchanged in full as hereinabove provided, the temporary
Securities of any series shall in all respects be entitled to the same benefits
under this Indenture as definitive Securities of the same series and of like
tenor authenticated and delivered hereunder, except that, unless otherwise
specified as contemplated by Section 301, interest payable on a temporary
global Security on an Interest Payment Date for Securities of such series shall
be payable to Euro-clear and CEDEL S.A. on such Interest Payment Date upon
delivery by Euro-clear and CEDEL S.A. to the Trustee of a certificate or
certificates in the form set forth in Exhibit B to this Indenture, for credit
without further interest on or after such Interest Payment Date to the
respective accounts of the Persons who are the beneficial owners of such
temporary global Security on such Interest Payment Date and who have each
delivered to Euro-clear or CEDEL S.A., as the case may be, a certificate in the
form set forth in Exhibit A to this Indenture.  Any interest so received by
Euro-clear and CEDEL S.A. and not paid as herein provided shall be returned to
the Trustee immediately prior to the expiration of two years





                                       24
<PAGE>   32
after such Interest Payment Date in order to be repaid to the Company in
accordance with Section 1003.

SECTION 305.  Registration, Registration of Transfer and Exchange.

         The Company shall cause to be kept at an office or agency to be
maintained by the Company in accordance with Section 1002 a register (being the
combined register of the Security Registrar and all transfer agents designated
pursuant to Section 1002 for the purpose of registration of transfer of
Securities and sometimes collectively referred to as the "Security Register")
in which, subject to such reasonable regulations as it may prescribe, the
Company shall provide for the registration of each series of Registered
Securities and the registration of transfers of such Registered Securities.
The Trustee shall serve initially as "Security Registrar" for the purpose of
registering Registered Securities and transfers of Registered Securities as
herein provided.

         Upon surrender for registration of transfer of any Registered Security
of any series at the office or agency of the Company maintained pursuant to
Section 1002 for such purpose in a Place of Payment for such series, the
Company shall execute, and the Trustee shall authenticate and deliver, in the
name of the designated transferee or transferees, one or more new Registered
Securities of the same series of any authorized denominations and of a like
aggregate principal amount and tenor.

         At the option of the Holder, Registered Securities of any series may
be exchanged for other Registered Securities of the same series of any
authorized denominations and of a like aggregate principal amount and tenor,
upon surrender of the Securities to be exchanged at any such office or agency.
Whenever any Securities are so surrendered for exchange, the Company shall
execute, and the Trustee shall authenticate and deliver, the Securities which
the Holder making the exchange is entitled to receive.  Unless otherwise
provided with respect to any series of Securities, Bearer Securities may not be
issued in exchange for Registered Securities.

         At the option of the Holder, Bearer Securities of any series may be
exchanged for Registered Securities of the same series of any authorized
denominations and of a like aggregate principal amount and tenor, upon
surrender of the Bearer Securities to be exchanged at any such office or
agency, with all unmatured coupons and all matured coupons in default thereto
appertaining.  If the Holder of a Bearer Security is unable to produce any such
unmatured coupon or coupons or matured coupon or coupons in default, such
exchange may be effected if the Bearer Securities are accompanied by payment in
funds acceptable to the Company in an amount equal to the face amount of such
missing coupon or coupons, or the surrender of such missing coupon or coupons
may be waived by the Company and the Trustee if there is furnished to them such
security or indemnity as they may require to save each of them and any Paying
Agent harmless.  If thereafter the Holder of such Security shall surrender to
any Paying Agent any such missing coupon in respect of which such a payment
shall have been made, such Holder shall be entitled to receive the amount of
such payment; provided, however, that, except as otherwise provided in Section
1002, interest represented by coupons shall be payable only upon presentation
and surrender of those coupons at an office or agency located outside the
United States.  Notwithstanding the foregoing, in case a Bearer Security





                                       25
<PAGE>   33
of any series is surrendered at any such office or agency in exchange for a
Registered Security of the same series and like tenor after the close of
business at such office or agency on (i) any Regular Record Date and before the
opening of business at such office or agency on the relevant Interest Payment
Date, or (ii) any Special Record Date and before the opening of business at
such office or agency on the related proposed date for payment of Defaulted
Interest, such Bearer Security shall be surrendered without the coupon relating
to such Interest Payment Date or proposed date for payment, as the case may be,
and interest or Defaulted Interest, as the case may be, will not be payable on
such Interest Payment Date or proposed date for payment, as the case may be, in
respect of the Registered Security issued in exchange for such Bearer Security
but will be payable only to the Holder of such coupon when due in accordance
with the provisions of this Indenture.

         Whenever any Securities are so surrendered for exchange, the Company
shall execute, and the Trustee shall authenticate and deliver, the Securities
which the Holder making the exchange is entitled to receive.

         Notwithstanding the foregoing, except as otherwise specified as
contemplated by Section 301, any permanent global Security shall be
exchangeable only as provided in this paragraph.  If the beneficial owners of
interests in a permanent global Security are entitled to exchange such
interests for Securities of such series and of like tenor and principal amount
of another authorized form and denomination, as specified as contemplated by
Section 301, then without unnecessary delay but in any event not later than the
earliest date on which such interests may be so exchanged, the Company shall
deliver to the Trustee definitive Securities of that series in an aggregate
principal amount equal to the principal amount of such permanent global
Security, executed by the Company.  On or after the earliest date on which such
interests may be so exchanged, such permanent global Security shall be
surrendered from time to time in accordance with instructions given to the
Trustee and the Common Depositary (which instructions shall be in writing but
need not comply with Section 102 or be accompanied by an Opinion of Counsel) by
the Common Depositary or such other depositary as shall be specified in the
Company Order with respect thereto to the Trustee, as the Company's agent for
such purpose, to be exchanged, in whole or in part, for definitive Securities
of the same series without charge, and the Trustee shall authenticate and
deliver, in exchange for each portion of such permanent global Security, a like
aggregate principal amount of definitive Securities of the same series of
authorized denominations and of like tenor as the portion of such permanent
global Security to be exchanged which, unless the Securities of the series are
not issuable both as Bearer Securities and as Registered Securities, as
specified as contemplated by Section 301, shall be in the form of Bearer
Securities or Registered Securities, or any combination thereof, as shall be
specified by the beneficial owner thereof; provided, however, that no such
exchanges may occur during a period beginning at the opening of business 15
days before any selection of Securities of that series for redemption and
ending on the relevant Redemption Date; and provided, further, that no Bearer
Security delivered in exchange for a portion of a permanent global Security
shall be mailed or otherwise delivered to any location in the United States.
Promptly following any such exchange in part, such permanent global Security
shall be returned by the Trustee to the Common Depositary or such other
depositary referred to above in accordance with the instructions of the Company
referred to above.  If a Registered Security is issued in exchange for any
portion of such permanent global Security after the close of business at the
office or agency where such exchange occurs on (i)





                                       26
<PAGE>   34
any Regular Record Date and before the opening of business at such office or
agency on the relevant Interest Payment Date, or (ii) any Special Record Date
and before the opening of business at such office or agency on the related
proposed date for payment of Defaulted Interest, interest or Defaulted
Interest, as the case may be, will not be payable on such Interest Payment Date
or proposed date for payment, as the case may be, in respect of such Registered
Security, but will be payable on such Interest Payment Date or proposed date
for payment, as the case may be, only to the Person to whom interest in respect
of such portion of such permanent global Security is payable in accordance with
provisions of this Indenture.

         All Securities issued upon any registration of transfer or exchange of
Securities shall be the valid obligations of the Company, evidencing the same
debt, and entitled to the same benefits under this Indenture, as the Securities
surrendered upon such registration of transfer or exchange.

         Every Registered Security presented or surrendered for registration of
transfer or exchange shall (if so required by the Company or the Trustee or any
transfer agent) be duly endorsed, or be accompanied by a written instrument of
transfer in form satisfactory to the Company and the Security Registrar or any
transfer agent duly executed, by the Holder thereof or his attorney duly
authorized in writing.

         No service charge shall be made for any registration of transfer or
exchange of Securities, but the Company may require payment of a sum sufficient
to cover any tax or other governmental charge that may be imposed in connection
with any registration of transfer or exchange of Securities, other than
exchanges pursuant to Section 304, 906 or 1107 not involving any transfer.

         The Company shall not be required (i) to issue, register the transfer
of or exchange Securities of any series during a period beginning at the
opening of business 15 days before any selection of Securities of that series
for redemption and ending at the close of business on (A) if Securities of the
series are issuable only as Registered Securities, the day of the mailing of
the relevant notice of redemption and (B) if Securities of the series are
issuable as Bearer Securities, the day of the first publication of the relevant
notice of redemption or, if Securities of the series are also issuable as
Registered Securities and there is no publication, the mailing of the relevant
notice of redemption, or (ii) to register the transfer of or exchange any
Registered Security so selected for redemption, in whole or in part, except the
unredeemed portion of any Registered Security being redeemed in part, or (iii)
to exchange any Bearer Security so selected for redemption except that such a
Bearer Security may be exchanged for a Registered Security of that series and
like tenor, provided that such Registered Security shall be simultaneously
surrendered for redemption.

         Notwithstanding the foregoing and except as otherwise specified as
contemplated by Section 301, any Book-Entry Security shall be exchangeable
pursuant to this Section 305 or Sections 304, 906 and 1107 for Securities
registered in the name of, and a transfer of a Book-Entry Security of any
series may be registered to, any Person other than the Depository for such
Security or its nominee only if (i) such Depository notifies the Company that
it is unwilling or unable to continue as Depository for such Book-Entry
Security or if at any time such Depository ceases to be a clearing agency
registered under the Securities Exchange Act of 1934 or (ii) the Company
executes





                                       27
<PAGE>   35
and delivers to the Trustee a Company Order that such Book-Entry Security shall
be so exchangeable and the transfer thereof so registrable.  Upon the
occurrence in respect of any Book-Entry Security of any series of any one or
more of the conditions specified in clause (i) or (ii) of the preceding
sentence or such other conditions as may be specified, such Book-Entry Security
may be exchanged for Securities registered in the names of, and the transfer of
such Book-Entry Security may be registered to, such Persons (including Persons
other than the Depository with respect to such series and its nominees) as such
Depository shall direct.  Notwithstanding any other provision of this
Indenture, any Security authenticated and delivered upon registration of
transfer of, or in exchange for, or in lieu of, any Book-Entry Security shall
also be a Book-Entry Security and shall bear the legend specified in Section
204 except for any Security authenticated and delivered in exchange for, or
upon registration of transfer of, a Book-Entry Security pursuant to the
preceding sentence.

SECTION 306.  Mutilated, Destroyed, Lost and Stolen Securities and Coupons.

         If any mutilated Security or a Security with a mutilated coupon
appertaining thereto is surrendered to the Trustee, the Company shall execute
and the Trustee shall authenticate and deliver in exchange therefor a new
Security of the same series and of like tenor and principal amount and bearing
a number not contemporaneously outstanding, with coupons corresponding to the
coupons, if any, appertaining to the surrendered Security.

         If there shall be delivered to the Company and the Trustee (i)
evidence to their satisfaction of the destruction, loss or theft of any
Security or coupon and (ii) such security or indemnity as may be required by
them to save each of them and any agent of either of them harmless, then, in
the absence of notice to the Company or the Trustee that such Security or
coupon has been acquired by a bona fide purchaser, the Company shall execute
and the Trustee shall authenticate and deliver, in lieu of any such destroyed,
lost or stolen Security or in exchange for the Security to which a destroyed,
lost or stolen coupon appertains (with all appurtenant coupons not destroyed,
lost or stolen), a new Security of the same series and of like tenor and
principal amount and bearing a number not contemporaneously outstanding, with
coupons corresponding to the coupons, if any, appertaining to such destroyed,
lost or stolen Security or to the Security to which such destroyed, lost or
stolen coupon appertains.

         If, after the delivery of such new Security, a bona fide purchaser of
the original Security in lieu of which such new security was issued presents
for payment or registration such original Security, the Trustee shall be
entitled to recover such new Security from the person to whom it was delivered
or any person taking therefrom, except a bona fide purchaser, and shall be
entitled to recover upon the security or indemnity provided therefor to the
extent of any loss, damage, cost or expense incurred by the Company or Trustee
in connection therewith.

         In case any such mutilated, destroyed, lost or stolen Security or
coupon has become or is about to become due and payable or is being surrendered
for conversion in full, the Company in its discretion may, instead of issuing a
new Security, pay such Security or coupon or authorize the conversion thereof
(without surrender thereof except in the case of a mutilated Security or
coupon); provided, however, that the principal of and any premium and interest
on Bearer Securities shall,





                                       28
<PAGE>   36
except as otherwise provided in Section 1002, be payable only at an office or
agency located outside the United States.

         Upon the issuance of any new Security under this Section, the Company
may require payment of a sum sufficient to cover any tax or other governmental
charge that may be imposed in relation thereto and any other expenses
(including the fees, and expenses of the Trustee) connected therewith.

         Every new Security of any series with its coupons, if any, issued
pursuant to this Section in lieu of any destroyed, lost or stolen Security or
in exchange for a Security to which a destroyed, lost or stolen coupon
appertains, shall constitute an original additional contractual obligation of
the Company, whether or not the destroyed, lost or stolen Security and its
coupons, if any, or the destroyed, lost or stolen coupon shall be at any time
enforceable by anyone, and any such new Security and coupons, if any, shall be
entitled to all the benefits of this Indenture equally and proportionately with
any and all other Securities of that series and their coupons, if any, duly
issued hereunder.

         The provisions of this Section are exclusive and shall preclude (to
the extent lawful) all other rights and remedies with respect to the
replacement, payment or conversion of mutilated, destroyed, lost or stolen
Securities or coupons.

SECTION 307.  Payment of Interest; Interest Rights Preserved.

         Unless otherwise provided as contemplated by Section 301 with respect
to any series of Securities, interest on any Registered Security which is
payable, and is punctually paid or duly provided for, on any Interest Payment
Date shall be paid to the Person in whose name that Security (or one or more
Predecessor Securities) is registered at the close of business on the Regular
Record Date for such interest.  Unless otherwise so provided, at the option of
the Company, payment of interest on any Registered Security may be made by
check mailed on or before the due date to the address of the Person entitled
thereto as such address shall appear in the Security Register.

         Any interest on any Registered Security of any series which is
payable, but is not punctually paid or duly provided for, on any Interest
Payment Date (herein called "Defaulted Interest") shall forthwith cease to be
payable to the Holder on the relevant Regular Record Date by virtue of having
been such Holder, and such Defaulted Interest may be paid by the Company, at
its election in each case, as provided in clause (1) or (2) below:

                 (1)      The Company may elect to make payment of any
         Defaulted Interest to the Persons in whose names the Registered
         Securities of such series (or their respective Predecessor Securities)
         are registered at the close of business on a Special Record Date for
         the payment of such Defaulted Interest, which shall be fixed in the
         following manner.  The Company shall notify the Trustee in writing of
         the amount of Defaulted Interest proposed to be paid on each
         Registered Security of such series and the date of the proposed
         payment, and at the same time the Company shall deposit with the
         Trustee an amount of money equal to the aggregate amount proposed to
         be paid in respect of such Defaulted Interest or shall make





                                       29
<PAGE>   37
         arrangements satisfactory to the Trustee for such deposit prior to the
         date of the proposed payment, such money when deposited to be held in
         trust for the benefit of the Persons entitled to such Defaulted
         Interest as in this Clause provided.  Thereupon the Trustee shall fix
         a Special Record Date for the payment of such Defaulted Interest which
         shall be not more than 15 days and not less than 10 days prior to the
         date of the proposed payment and not less than 10 days after the
         receipt by the Trustee of the notice of the proposed payment.  The
         Trustee shall promptly notify the Company of such Special Record Date
         and, in the name and at the expense of the Company, shall cause notice
         of the proposed payment of such Defaulted Interest and the Special
         Record Date therefor to be mailed, first-class postage prepaid, to
         each Holder of Registered Securities of such series at the address of
         such Holder as it appears in the Security Register, not less than 10
         days prior to such Special Record Date.  Notice of the proposed
         payment of such Defaulted Interest and the Special Record Date
         therefor having been so mailed, such Defaulted Interest shall be paid
         to the Persons in whose names the Registered Securities of such series
         (or their respective Predecessor Securities) are registered at the
         close of business on such Special Record Date and shall no longer be
         payable pursuant to the following clause (2).

                 (2)      The Company may make payment of any Defaulted
         Interest on the Registered Securities of any series in any other
         lawful manner not inconsistent with the requirements of any securities
         exchange on which such Securities may be then listed, and upon such
         notice as may be required by such exchange, if, after notice given by
         the Company to the Trustee of the proposed payment pursuant to this
         clause, such manner of payment shall be deemed practicable by the
         Trustee.

         Subject to the foregoing provisions of this Section and Section 305,
each Security delivered under this Indenture upon registration of transfer of
or in exchange for or in lieu of any other Security shall carry the rights to
interest accrued and unpaid, and to accrue, which were carried by such other
Security.

SECTION 308.  Persons Deemed Owners.

         Prior to due presentment of a Registered Security for registration of
transfer, the Company, the Trustee and any agent of the Company or the Trustee
may treat the Person in whose name such Registered Security is registered as
the owner of such Registered Security for the purpose of receiving payment of
principal of (and premium, if any) and (subject to Sections 305 and 307) any
interest on such Security and for all other purposes whatsoever, whether or not
such Security be overdue, and neither the Company, the Trustee nor any agent of
the Company or the Trustee shall be affected by notice to the contrary.

         Title to any Bearer Security and any coupons appertaining thereto
shall pass by delivery.  The Company, the Trustee and any agent of the Company
or the Trustee may treat the bearer of any Bearer Security and the bearer of
any coupon as the owner of such Security or coupon for the purpose of receiving
payment thereof or on account thereof and for all other purposes whatsoever,





                                       30
<PAGE>   38
whether or not such Security or coupon be overdue, and neither the Company, the
Trustee nor any agent of the Company or the Trustee shall be affected by notice
to the contrary.

         Notwithstanding the foregoing, with respect to any Book-Entry
Security, nothing herein shall prevent the Company, the Trustee, or any agent
of the Company or the Trustee, from giving effect to any written certification,
proxy or other authorization furnished by a Depository or impair, as between a
Depository and holders of beneficial interests in any Book-Entry Security, the
operation of customary practices governing the exercise of the rights of the
Depository (or its nominee) as Holder of such Book-Entry Security.

SECTION 309.  Cancellation.

         All Securities and coupons surrendered for payment, redemption,
registration of transfer, conversion or exchange or for credit against any
sinking fund payment shall, if surrendered to any Person other than the
Trustee, be delivered to the Trustee.  All Registered Securities and matured
coupons so delivered shall be promptly canceled by the Trustee.  All Bearer
Securities and unmatured coupons so delivered shall be held by the Trustee and,
upon instruction by a Company Order, shall be canceled or held for reissuance.
Bearer Securities and unmatured coupons held for reissuance may be reissued
only in replacement of mutilated, lost, stolen or destroyed Bearer Securities
of the same series and like tenor or the related coupons pursuant to Section
306.  All Bearer Securities and unmatured coupons held by the Trustee pending
such cancellation or reissuance shall be deemed to be delivered for all
purposes of this Indenture and the Securities.  The Company may at any time
deliver to the Trustee for cancellation any Securities previously authenticated
and delivered hereunder which the Company may have acquired in any manner
whatsoever, and may deliver to the Trustee (or to any other Person for delivery
to the Trustee) for cancellation any Securities previously authenticated
hereunder which the Company has not issued and sold, and all Securities so
delivered shall be promptly canceled by the Trustee.  No Securities shall be
authenticated in lieu of or in exchange for any Securities canceled as provided
in this Section, except as expressly permitted by this Indenture.  All canceled
Securities and coupons held by the Trustee shall be disposed of in accordance
with its customary practice.

SECTION 310.  Computation of Interest.

         Except as otherwise specified as contemplated by Section 301 for
Securities of any series, interest on the Securities of each series shall be
computed on the basis of a 360-day year of twelve 30-day months.

                                  ARTICLE FOUR
                           SATISFACTION AND DISCHARGE

SECTION 401.  Satisfaction and Discharge of Indenture.

         This Indenture shall upon Company Request cease to be of further
effect (except as to any surviving rights of registration of transfer or
exchange of Securities herein expressly provided for,





                                       31
<PAGE>   39
and any right to receive additional amounts, as provided in Section 1004), and
the Trustee, at the expense of the Company, shall execute proper instruments
acknowledging satisfaction and discharge of this Indenture, when

         (1)     either

                 (A)      all Securities theretofore authenticated and
         delivered and all coupons, if any, appertaining thereto (other than
         (i) coupons appertaining to Bearer Securities surrendered for exchange
         for Registered Securities and maturing after such exchange, whose
         surrender is not required or has been waived as provided in Section
         305, (ii) Securities and coupons which have been destroyed, lost or
         stolen and which have been replaced, converted or paid as provided in
         Section 306, (iii) coupons appertaining to Securities called for
         redemption and maturing after the relevant Redemption Date, whose
         surrender has been waived as provided in Section 1106, and (iv)
         Securities and coupons for whose payment money has theretofore been
         deposited in trust or segregated and held in trust by the Company and
         thereafter repaid to the Company or discharged from such trust, as
         provided in Section 1003) have been delivered to the Trustee for
         cancellation; or

                 (B)      all such Securities and, in the case of (i) or (ii)
         below, any coupons appertaining thereto not theretofore delivered to
         the Trustee for cancellation

                          (i)     have become due and payable, or

                          (ii)    will become due and payable at their Stated 
                 Maturity within one year, or

                          (iii)   are to be called for redemption within one
                 year under arrangements satisfactory to the Trustee for the
                 giving of notice of redemption by the Trustee in the name, and
                 at the expense, of the Company;

         and the Company, in the case of (i), (ii) or (iii) above, has
         deposited or caused to be deposited with the Trustee as trust funds in
         trust for the purpose an amount sufficient to pay and discharge the
         entire indebtedness on such Securities and coupons not theretofore
         delivered to the Trustee for cancellation, for principal (and premium,
         if any) and any interest to the date of such deposit (in the case of
         Securities which have become due and payable) or to the Stated
         Maturity or Redemption Date, as the case may be;

         (2)     the Company has paid or caused to be paid all other sums
payable hereunder by the Company; and

         (3)     the Company has delivered to the Trustee an Officers'
Certificate and an Opinion of Counsel, each stating that all conditions
precedent herein provided for relating to the satisfaction and discharge of
this Indenture have been complied with.





                                       32
<PAGE>   40
         Notwithstanding the satisfaction and discharge of this Indenture, the
obligations of the Company to the Trustee under Section 607, the obligations of
the Trustee to any Authenticating Agent under Section 614 and, if money shall
have been deposited with the Trustee pursuant to clause (1)(B) of this Section,
the obligations of the Trustee under Section 402 and the last paragraph of
Section 1003 shall survive.

SECTION 402.  Application of Trust Money.

         Subject to the provisions of the last paragraph of Section 1003, all
money deposited with the Trustee pursuant to Section 401 shall be held in trust
and applied by it, in accordance with the provisions of the Securities, the
coupons and this Indenture, to the payment, either directly or through any
Paying Agent (including the Company acting as its own Paying Agent) as the
Trustee may determine, to the Persons entitled thereto, of the principal and
any premium and interest for whose payment such money has been deposited.

                                  ARTICLE FIVE
                                    REMEDIES

SECTION 501.  Events of Default.

         "Event of Default", wherever used herein with respect to Securities of
any series, means any one of the following events (whatever the reason for such
Event of Default and whether it shall be voluntary or involuntary or be
effected by the provisions of Article Sixteen hereof or by operation of law or
pursuant to any judgment, decree or order, rule or regulation of any
administrative or governmental body), unless it is either inapplicable to a
particular series of Securities or it is specifically deleted or modified in or
pursuant to the terms of such series or in the form of Security of such series:

                 (1)      default in the payment of any interest upon any
         Security of that series when it becomes due and payable, and
         continuance of such default for a period of 30 days; or

                 (2)      default in the payment of the principal of (or
         premium, if any, on) any Security of that series at its Maturity; or

                 (3)      default in the deposit of any sinking fund payment,
         when and as due by the terms of a Security of that series; or

                 (4)      default in the performance, or breach, of any
         covenant of the Company in this Indenture (other than a covenant a
         default in whose performance or whose breach is elsewhere in this
         Section specifically dealt with or which has expressly been included
         in this Indenture solely for the benefit of series of Securities other
         than that series), and continuance of such default or breach for a
         period of 60 days after there has been given, by registered or
         certified mail, to the Company by the Trustee or to the Company and
         the Trustee by the Holders of at least 25% in principal amount of the
         Outstanding Securities of that series a





                                       33
<PAGE>   41
         written notice specifying such default or breach and requiring it to
         be remedied and stating that such notice is a "Notice of Default"
         hereunder; or

                 (5)      the entry by a court having jurisdiction in the
         premises of (A) a decree or order for relief in respect of the Company
         in an involuntary case or proceeding under any applicable Federal or
         State bankruptcy, insolvency, reorganization or other similar law or
         (B) a decree or order adjudging the Company a bankrupt or insolvent,
         or approving as properly filed a petition seeking reorganization,
         arrangement, adjustment or composition of or in respect of the Company
         under any applicable Federal or State law, or appointing a custodian,
         receiver, liquidator, assignee, trustee, sequestrator or other similar
         official of the Company or of any substantial part of its property, or
         ordering the winding up or liquidation of its affairs, and the
         continuance of any such decree or order for relief or any such other
         decree or order unstayed and in effect for a period of 90 consecutive
         days; or

                 (6)      the commencement by the Company of a voluntary case
         or proceeding under any applicable Federal or State bankruptcy,
         insolvency, reorganization or other similar law or of any other case
         or proceeding to be adjudicated a bankrupt or insolvent, or the
         consent by it to the entry of a decree or order for relief in respect
         of the Company in an involuntary case or proceeding under any
         applicable Federal or State bankruptcy, insolvency, reorganization or
         other similar law or the commencement of any bankruptcy or insolvency
         case or proceeding against it, or the filing by it of a petition or
         answer or consent seeking reorganization or relief under any
         applicable Federal or State law, or the consent by it to the filing of
         such petition or to the appointment of or taking possession by a
         custodian, receiver, liquidator, assignee, trustee, sequestrator or
         similar official of the Company or of any substantial part of its
         property, or the making by it of an assignment for the benefit of
         creditors, or the admission by it in writing of its inability to pay
         its debts generally as they become due, or the taking of corporate
         action by the Company in furtherance of any such action; or

                 (7)      any other Event of Default provided with respect to
         Securities of that series.

SECTION 502.  Acceleration of Maturity; Rescission and Annulment.

         If an Event of Default with respect to Securities of any series at the
time Outstanding occurs and is continuing, then in every such case the Trustee
or the Holders of not less than 25% in principal amount of the Outstanding
Securities of that series may declare the principal amount (or, if any of the
Securities of that series are Original Issue Discount Securities, such portion
of the principal amount of such Securities as may be specified in the terms
thereof) of all of the Securities of that series to be due and payable
immediately, by a notice in writing to the Company (and to the Trustee if given
by Holders), and upon any such declaration such principal amount (or specified
amount) shall become immediately due and payable.

         At any time after such a declaration of acceleration with respect to
Securities of any series has been made and before a judgment or decree for
payment of the money due has been obtained by





                                       34
<PAGE>   42
the Trustee as hereinafter in this Article provided, the Holders of a majority
in principal amount of the Outstanding Securities of that series, by written
notice to the Company and the Trustee, may rescind and annul such declaration
and its consequences if

                 (1)      the Company has paid or deposited with the Trustee a
         sum sufficient to pay
        
                          (A)     all overdue interest on all Securities of
                 that series,

                          (B)     the principal of (and premium, if any, on)
                 any Securities of that series which have become due otherwise
                 than by such declaration of acceleration and any interest
                 thereon at the rate or rates prescribed therefor in such
                 Securities,

                          (C)     to the extent that payment of such interest
                 is lawful, interest upon overdue interest at the rate or rates
                 prescribed therefor in such Securities, and

                          (D)     all sums paid or advanced by the Trustee
                 hereunder and the reasonable compensation, expenses,
                 disbursements and advances of the Trustee, its agents and
                 counsel;

         and

                 (2)      all Events of Default with respect to Securities of
         that series, other than the non-payment of the principal of Securities
         of that series which have become due solely by such declaration of
         acceleration, have been cured or waived as provided in Section 513.

No such rescission shall affect any subsequent default or impair any right
consequent thereon.

SECTION 503.  Collection of Indebtedness and Suits for Enforcement by Trustee.

         The Company covenants that if

                 (1)      default is made in the payment of any interest on any
         Security when such interest becomes due and payable and such default
         continues for a period of 30 days, or

                 (2)      default is made in the payment of the principal of
         (or premium, if any, on) any Security at the Maturity thereof,

the Company will, upon demand of the Trustee, pay to it, for the benefit of the
Holders of such Securities and coupons, the whole amount then due and payable
on such Securities and coupons for principal and any premium and interest and,
to the extent that payment of such interest shall be legally enforceable,
interest on any overdue principal and premium and on any overdue interest, at
the rate or rates prescribed therefor in such Securities and, in addition
thereto, such further amount as shall be sufficient to cover the costs and
expenses of collection, including the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel.





                                       35
<PAGE>   43
         If the Company fails to pay such amounts forthwith upon such demand,
the Trustee, in its own name and as trustee of an express trust, may institute
a judicial proceeding for the collection of the sums so due and unpaid, may
prosecute such proceeding to judgment or final decree and may enforce the same
against the Company or any other obligor upon such Securities and collect the
moneys adjudged or decreed to be payable in the manner provided by law out of
the property of the Company or any other obligor upon such Securities, wherever
situated.

         If an Event of Default with respect to Securities of any series occurs
and is continuing, the Trustee may in its discretion proceed to protect and
enforce its rights and the rights of the Holders of Securities of such series
and any related coupons by such appropriate judicial proceedings as the Trustee
shall deem most effectual to protect and enforce any such rights, whether for
the specific enforcement of any covenant or agreement in this Indenture or in
aid of the exercise of any power granted herein, or to enforce any other proper
remedy.

SECTION 504.  Trustee May File Proofs of Claim.

         In case of any judicial proceeding relative to the Company (or any
other obligor upon the Securities), its property or its creditors, the Trustee
shall be entitled and empowered, by intervention in such proceeding or
otherwise, to take any and all actions authorized under the Trust Indenture Act
in order to have claims of the Holders and the Trustee allowed in any such
proceeding.  In particular, subject to Article Sixteen hereof,  the Trustee
shall be authorized to collect and receive any moneys or other property payable
or deliverable on any such claims and to distribute the same; and any
custodian, receiver, assignee, trustee, liquidator, sequestrator or other
similar official in any such judicial proceeding is hereby authorized by each
Holder to make such payments to the Trustee and, in the event that the Trustee
shall consent to the making of such payments directly to the Holders, to pay to
the Trustee any amount due it for the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel, and any
other amounts due the Trustee under Section 607.

         No provision of this Indenture shall be deemed to authorize the
Trustee to authorize or consent to or accept or adopt on behalf of any Holder
any plan of reorganization, arrangement, adjustment or composition affecting
the Securities or the rights of any Holder thereof or to authorize the Trustee
to vote in respect of the claim of any Holder in any such proceeding; provided,
however, that the Trustee may, on behalf of Holders, vote for the election of a
trustee of bankruptcy or similar official and be a member of a creditors' or
other similar committee.

SECTION 505.  Trustee May Enforce Claims Without Possession of Securities or
              Coupons.

         All rights of action and claims under this Indenture or the Securities
or coupons may be prosecuted and enforced by the Trustee without the possession
of any of the Securities or coupons or the production thereof in any proceeding
relating thereto, and any such proceeding instituted by the Trustee shall be
brought in its own name as trustee of an express trust, and any recovery of
judgment shall, after provision for the payment of reasonable compensation,
expenses, disbursements





                                       36
<PAGE>   44
and advances of the Trustee, its agents and counsel, be for the ratable benefit
of the Holders of the Securities and coupons in respect of which such judgment
has been recovered.

SECTION 506.  Application of Money Collected.

         Any money collected by the Trustee pursuant to this Article shall be
applied in the following order, at the date or dates fixed by the Trustee and,
in case of the distribution of such money on account of principal or any
premium or interest, upon presentation of the Securities or coupons, or both as
the case may be, and the notation thereon of the payment if only partially paid
and upon surrender thereof if fully paid:

                 FIRST:  To the payment of all amounts due the Trustee under
         Section 607; and

                 SECOND:  Subject to Article Sixteen hereof, to the payment of
         the amounts then due and unpaid for principal of and any premium and
         interest on the Securities and coupons in respect of which or for the
         benefit of which such money has been collected, ratably, without
         preference or priority of any kind, according to the amounts due and
         payable on such Securities and coupons for principal and any premium
         and interest, respectively.

         In any case in which Securities are Outstanding that are denominated
in more than one currency and the Trustee is directed to make ratable payments
under this Section to Holders of such Securities, unless otherwise provided
with respect to any series of Securities, the Trustee shall calculate the
amount of such payments as follows:  (i) as of the day the Trustee collects an
amount under this Article, the Trustee shall, as to each Holder of a Security
to whom an amount is due and payable under this Section that is denominated in
a foreign currency, determine that amount in Dollars that would be obtained for
the amount owing such Holder, using the rate of exchange at which in accordance
with normal banking procedures the Trustee could purchase in The City of New
York Dollars with such amount owing; (ii) calculate the sum of all Dollar
amounts determined under (i) and add thereto any amounts due and payable in
Dollars; and (iii) using the individual amounts determined in (i) or any
individual amounts due and payable in Dollars, as the case may be, as a
numerator, and the sum calculated in (ii) as a denominator, calculate as to
each Holder of a Security to whom an amount is owed under this Section the
fraction of the amount collected under this Article payable to such Holder.
Any expenses incurred by the Trustee in actually converting amounts owing
Holders of Securities denominated in a currency other than that in which any
amount is collected under this Article shall be likewise (in accordance with
this paragraph) borne ratably by all Holders of Securities to whom amounts are
payable under this Section.

         To the fullest extent allowed under applicable law, if for the purpose
of obtaining judgment against the Company in any court it is necessary to
convert the sum due in respect of the principal of, or premium, if any, or
interest on, the Securities of any series (the "Required Currency") into a
currency in which a judgment will be rendered (the "Judgment Currency"), the
rate of exchange used shall be the rate at which in accordance with normal
banking procedures the Trustee could purchase in The City of New York the
Required Currency with the Judgment Currency on the Business Day in the City of
New York next preceding that on which final judgment is given.  Neither the
Company





                                       37
<PAGE>   45
nor the Trustee shall be liable for any shortfall nor shall it benefit from any
windfall in payments to Holders of Securities under this Section caused by a
change in exchange rates between the time the amount of a judgment against the
Company is calculated as above and the time the Trustee converts the Judgment
Currency into the Required Currency to make payments under this Section to
Holders of Securities, but payment of such judgment shall discharge all amounts
owed by the Company on the claim or claims underlying such judgment.

SECTION 507.  Limitation on Suits.

         No Holder of any Security of any series or any related coupons shall
have any right to institute any proceeding, judicial or otherwise, with respect
to this Indenture, or for the appointment of a receiver or trustee, or for any
other remedy hereunder, unless:

                 (1)      such Holder has previously given written notice to
         the Trustee of a continuing Event of Default with respect to the
         Securities of that series;

                 (2)      the Holders of not less than 25% in principal amount
         of the Outstanding Securities of that series shall have made written
         request to the Trustee to institute proceedings in respect of such
         Event of Default in its own name as Trustee hereunder;

                 (3)      such Holder or Holders have offered to the Trustee
         reasonable indemnity against the costs, expenses and liabilities to be
         incurred in compliance with such request;

                 (4)      the Trustee for 60 days after its receipt of such
         notice, request and offer of indemnity has failed to institute any
         such proceeding; and

                 (5)      no direction inconsistent with such written request
         has been given to the Trustee during such 60-day period by the Holders
         of a majority in principal amount of the Outstanding Securities of
         that series;

it being understood and intended that no one or more of such Holders shall have
any right in any manner whatever by virtue of, or by availing of, any provision
of this Indenture to affect, disturb or prejudice the rights of any other of
such Holders, or to obtain or to seek to obtain priority or preference over any
other of such Holders or to enforce any right under this Indenture, except in
the manner herein provided and for the equal and ratable benefit of all such
Holders.

SECTION 508.  Unconditional Right of Holders to Receive Principal, Premium and
              Interest.

         Notwithstanding any other provision in this Indenture (but subject to
Article Sixteen hereof), the Holder of any Security or coupon shall have the
right, which is absolute and unconditional, to receive payment of the principal
of and any premium and (subject to Sections 305 and 307) any interest on such
Security or payment of such coupon on the Stated Maturity or Maturities
expressed in such Security or coupon (or, in the case of redemption, on the
Redemption Date) and, if applicable, to convert such Security as provided in
Article Fifteen and to institute suit for the





                                       38
<PAGE>   46
enforcement of any such payment or conversion right, and such rights shall not
be impaired without the consent of such Holder.

SECTION 509.  Restoration of Rights and Remedies.

         If the Trustee or any Holder of a Security or coupon has instituted
any proceeding to enforce any right or remedy under this Indenture and such
proceeding has been discontinued or abandoned for any reason, or has been
determined adversely to the Trustee or to such Holder, then and in every such
case, subject to any determination in such proceeding, the Company, the Trustee
and the Holders of Securities and coupons shall be restored severally and
respectively to their former positions hereunder and thereafter all rights and
remedies of the Trustee and the Holders shall continue as though no such
proceeding had been instituted.

SECTION 510.  Rights and Remedies Cumulative.

         Except as otherwise provided with respect to the replacement or
payment of mutilated, destroyed, lost or stolen Securities or coupons in the
last paragraph of Section 306, no right or remedy herein conferred upon or
reserved to the Trustee or to the Holders of Securities or coupons is intended
to be exclusive of any other right or remedy, and every right and remedy shall,
to the extent permitted by law, be cumulative and in addition to every other
right and remedy given hereunder or now or hereafter existing at law or in
equity or otherwise.  The assertion or employment of any right or remedy
hereunder, or otherwise, shall not prevent the concurrent assertion or
employment of any other appropriate right or remedy.

SECTION 511.  Delay or Omission Not Waiver.

         No delay or omission of the Trustee or of any Holder of any Security
or coupon to exercise any right or remedy accruing upon any Event of Default
shall impair any such right or remedy or constitute a waiver of any such Event
of Default or an acquiescence therein.  Every right and remedy given by this
Article or by law to the Trustee or to the Holders of Securities or coupons may
be exercised from time to time, and as often as may be deemed expedient, by the
Trustee or by the Holders of Securities or coupons, as the case may be.

SECTION 512.  Control by Holders of Securities.

         The Holders of a majority in principal amount of the Outstanding
Securities of any series shall have the right to direct the time, method and
place of conducting any proceeding for any remedy available to the Trustee, or
exercising any trust or power conferred on the Trustee, with respect to the
Securities of such series, provided that

                 (1)      such direction shall not be in conflict with any rule
         of law or with this Indenture;





                                       39
<PAGE>   47
                 (2)      the Trustee may take any other action deemed proper
         by the Trustee which is not inconsistent with such direction; and

                 (3)      the Trustee shall not be obligated to take any action
         unduly prejudicial to Holders not joining in such direction or
         involving the Trustee in personal liability.

SECTION 513.  Waiver of Past Defaults.

         The Holders of a majority in principal amount of the Outstanding
Securities of any series may on behalf of the Holders of all the Securities of
such series waive any past default hereunder with respect to the Securities of
such series and its consequences, except a default

                 (1)      in the payment of the principal of or any premium or
         interest on any Security of such series, or

                 (2)      in respect of a covenant or provision hereof which
         under Article Nine cannot be modified or amended without the consent
         of the Holder of each Outstanding Security of such series affected.

         Upon any such waiver, such default shall cease to exist, and any Event
of Default arising therefrom shall be deemed to have been cured, for every
purpose of this Indenture; but no such waiver shall extend to any subsequent or
other default or impair any right consequent thereon.

SECTION 514.  Undertaking for Costs.

         In any suit for the enforcement of any right or remedy under this
Indenture, or in any suit against the Trustee for any action taken, suffered or
omitted by it as Trustee, a court may require any party litigant in such suit
to file an undertaking to pay the costs of such suit, and may assess costs
against any such party litigant, in the manner and to the extent provided in
the Trust Indenture Act; provided, however,  that neither this Section nor the
Trust Indenture Act shall be deemed to authorize any court to require such an
undertaking or to make such an assessment in any suit instituted by the
Company.

SECTION 515.  Waiver of Stay or Extension Laws.

         The Company covenants (to the extent that it may lawfully do so) that
it will not at any time insist upon, or plead, or in any manner whatsoever
claim to take the benefit or advantage of, any stay or extension law wherever
enacted, now or at any time hereafter in force, which may affect the covenants
or the performance of this Indenture; and the Company (to the extent that it
may lawfully do so) hereby expressly waives all benefit or advantage of any
such law and covenants that it will not hinder, delay or impede the execution
of any power herein granted to the Trustee, but will suffer and permit the
execution of every such power as though no such law had been enacted.





                                       40
<PAGE>   48
                                  ARTICLE SIX
                                  THE TRUSTEE

SECTION 601.  Certain Duties and Responsibilities.

         The duties and responsibilities of the Trustee shall be as provided by
the Trust Indenture Act.  Notwithstanding the foregoing, no provision of this
Indenture shall require the Trustee to expend or risk its own funds or
otherwise incur any financial liability in the performance of any of its duties
hereunder, or in the exercise of any of its rights or powers, if it shall have
reasonable grounds for believing that repayment of such funds or adequate
indemnity against such risk or liability is not reasonably assured to it.
Whether or not therein expressly so provided, every provision of this Indenture
relating to the conduct or affecting the liability of or affording protection
to the Trustee shall be subject to the provisions of this Section.

SECTION 602.  Notice of Defaults.

         If a default occurs hereunder with respect to Securities of any
series, the Trustee shall give the Holders of Securities of such series notice
of such default as and to the extent provided by the Trust Indenture Act;
provided, however, that in the case of (i) any default of the character
specified in Section 501(4) with respect to Securities of such series or (ii)
any default added to this Indenture pursuant to clause (17) of Section 301 for
the benefit of the Holders of such series, no such notice to Holders shall be
given until at least 30 days after the occurrence thereof.  For the purpose of
this Section, the term "default" means any event which is, or after notice or
lapse of time or both would become, an Event of Default with respect to
Securities of such series.

SECTION 603.  Certain Rights of Trustee.

         Subject to the provisions of Section 601:

                 (1)      the Trustee may rely and shall be protected in acting
         or refraining from acting upon any resolution, certificate, statement,
         instrument, opinion, report, notice, request, direction, consent,
         order, bond, debenture, note, other evidence of indebtedness or other
         paper or document believed by it to be genuine and to have been signed
         or presented by the proper party or parties;

                 (2)      any request or direction of the Company mentioned
         herein shall be sufficiently evidenced by a Company Request or Company
         Order and any resolution of the Board of Directors shall be
         sufficiently evidenced by a Board Resolution;

                 (3)      whenever in the administration of this Indenture the
         Trustee shall deem it desirable that a matter be proved or established
         prior to taking, suffering or omitting any action hereunder, the
         Trustee (unless other evidence be herein specifically prescribed) may,
         in the absence of bad faith on its part, rely upon an Officers'
         Certificate;





                                       41
<PAGE>   49
                 (4)      the Trustee may consult with counsel and the written
         advice of such counsel or any Opinion of Counsel shall be full and
         complete authorization and protection in respect of any action taken,
         suffered or omitted by it hereunder in good faith and in reliance
         thereon;

                 (5)      the Trustee shall be under no obligation to exercise
         any of the rights or powers vested in it by this Indenture at the
         request or direction of any of the Holders pursuant to this Indenture,
         unless such Holders shall have offered to the Trustee reasonable
         security or indemnity against the costs, expenses and liabilities
         which might be incurred by it in compliance with such request or
         direction;

                 (6)      the Trustee shall not be bound to make any
         investigation into the facts or matters stated in any resolution,
         certificate, statement, instrument, opinion, report, notice, request,
         direction, consent, order, bond, debenture, note, other evidence of
         indebtedness or other paper or document, but the Trustee, in its
         discretion, may make such further inquiry or investigation into such
         facts or matters as it may see fit, and, if the Trustee shall
         determine to make such further inquiry or investigation, it shall be
         entitled to examine the books, records and premises of the Company,
         personally or by agent or attorney;

                 (7)      the Trustee may execute any of the trusts or powers
         hereunder or perform any duties hereunder either directly or by or
         through agents or attorneys and the Trustee shall not be responsible
         for any misconduct or negligence on the part of any agent or attorney
         appointed with due care by it hereunder;

                 (8)      the Trustee is not required to take notice or deemed
         to have notice of any default or Event of Default hereunder, except
         Events of Default under Section 501(1) and 501(2), unless a
         Responsible Officer of the Trustee has actual knowledge thereof or has
         received notice in writing of such default or Event of Default from
         the Company or from the Holders of at least 25% in aggregate principal
         amount of the Outstanding Securities, and in the absence of any such
         notice, the Trustee may conclusively assume that no such default or
         Event of Default exists;

                 (9)      the Trustee is not required to give any bond or
         surety with respect to the performance of its duties or the exercise
         of its powers under this Indenture;

                 (10)     in the event the Trustee receives inconsistent or
         conflicting requests and indemnity from two or more groups of Holders
         of Securities, each representing less than a majority in aggregate
         principal amount of the Securities Outstanding, pursuant to the
         provisions of this Indenture, the Trustee, in its sole discretion, may
         determine what action, if any, shall be taken;

                 (11)     the permissive rights of the Trustee to take the
         actions permitted by this Indenture shall not be construed as an
         obligation or duty to do so; and





                                       42
<PAGE>   50
                 (12)     except for information provided by the Trustee
         concerning the Trustee, the Trustee shall have no responsibility for
         any information in any prospectus or other disclosure material
         distributed with respect to the Securities, and the Trustee shall have
         no responsibility for compliance with any state or federal securities
         laws (other than the Trust Indenture Act) in connection with the
         Securities.

SECTION 604.  Not Responsible for Recitals or Issuance of Securities.

         The recitals contained herein and in the Securities (except the
Trustee's certificates of authentication) and in any coupons shall be taken as
the statements of the Company, and the Trustee or any Authenticating Agent
assumes no responsibility for their correctness.  The Trustee makes no
representations as to the validity or sufficiency of this Indenture or of the
Securities or coupons.  The Trustee or any Authenticating Agent shall not be
accountable for the use or application by the Company of Securities or the
proceeds thereof.

SECTION 605.  May Hold Securities.

         The Trustee, any Authenticating Agent, any Paying Agent, any Security
Registrar or any other agent of the Company, in its individual or any other
capacity, may become the owner or pledgee of Securities and coupons and,
subject to Sections 608 and 613, may otherwise deal with the Company with the
same rights it would have if it were not Trustee, Authenticating Agent, Paying
Agent, Security Registrar or such other agent.  The provisions of this Section
shall extend to Affiliates of the Trustee.

SECTION 606.  Money Held in Trust.

         Money held by the Trustee in trust hereunder need not be segregated
from other funds except to the extent required by law.  The Trustee shall be
under no liability for interest on any money received by it hereunder except as
otherwise agreed with the Company.

SECTION 607.  Compensation and Reimbursement.

         The Company agrees:

                 (1)      to pay to the Trustee from time to time reasonable
         compensation for all services rendered by it hereunder (which
         compensation shall not be limited by any provision of law in regard to
         the compensation of a trustee of an express trust);

                 (2)      except as otherwise expressly provided herein, to
         reimburse the Trustee and each predecessor Trustee upon its request
         for all reasonable expenses, disbursements and advances incurred or
         made by the Trustee in accordance with any provision of this Indenture
         (including the reasonable compensation and the expenses and
         disbursements of its agents and counsel), except any such expense,
         disbursement or advance as may be attributable to its negligence or
         bad faith; and





                                       43
<PAGE>   51
                 (3)      to indemnify the Trustee and each predecessor Trustee
         for, and to hold it harmless against, any loss, liability or expense
         incurred without negligence or bad faith on its part, arising out of
         or in connection with the acceptance or administration of the trust or
         trusts hereunder, including the costs and expenses of defending itself
         against any claim or liability in connection with the exercise or
         performance of any of its powers or duties hereunder.

         In the event the Trustee incurs or renders services in any proceedings
in connection with an Event of Default under Section 501(5) or 501(6) hereof,
or any event which, with the passage of time, would become such an Event of
Default, the expenses so incurred and compensation for services so rendered are
intended to constitute expenses of administration under the United States
Bankruptcy Code or equivalent law.

         The obligations of the Company under this Section shall not be
subordinated to the payment of Senior Indebtedness pursuant to Article Sixteen
hereof, and as security for the performance of such obligations, the Trustee
shall have a lien prior to the Securities upon all property and funds held or
collected by the Trustee as such, except funds held in trust for the benefit of
the Holders of particular Securities.

SECTION 608.  Disqualification; Conflicting Interests.

         If the Trustee has or shall acquire a conflicting interest within the
meaning of the Trust Indenture Act, the Trustee shall either eliminate such
interest or resign, to the extent and in the manner provided by, and subject to
the provisions of, the Trust Indenture Act and this Indenture.

SECTION 609.  Corporate Trustee Required; Eligibility.

         There shall at all times be a Trustee hereunder which shall be a bank
or trust company organized and doing business under the laws of the United
States of America, any State thereof or the District of Columbia, authorized
under such laws to exercise corporate trust powers, having a combined capital
and surplus of at least $50,000,000, subject to supervision or examination by
Federal or State authority.  If such corporation publishes reports of condition
at least annually, pursuant to law or to the requirements of said supervising
or examining authority, then for the purposes of this Section, the combined
capital and surplus of such corporation shall be deemed to be its combined
capital and surplus as set forth in its most recent report of condition so
published.  If at any time the Trustee shall cease to be eligible in accordance
with the provisions of this Section, it shall resign immediately in the manner
and with the effect hereinafter specified in this Article.  No obligor upon any
Security issued under this Indenture or a Person directly or indirectly
controlling, controlled by or under common control with such obligor shall
serve as Trustee under this Indenture.





                                       44
<PAGE>   52
SECTION 610.  Resignation and Removal; Appointment of Successor.

         (a)      No resignation or removal of the Trustee and no appointment
of a successor Trustee pursuant to this Article shall become effective until
the acceptance of appointment by the successor Trustee in accordance with the
applicable requirements of Section 611.

         (b)     The Trustee may resign at any time with respect to the
Securities of one or more series by giving written notice thereof to the
Company.  If the instrument of acceptance by a successor Trustee required by
Section 611 shall not have been delivered to the Trustee within 30 days after
the giving of such notice of resignation, the resigning Trustee may petition
any court of competent jurisdiction for the appointment of a successor Trustee
with respect to the Securities of such series.

         (c)     The Trustee may be removed at any time with respect to the
Securities of any series by Act of the Holders of a majority in principal
amount of the Outstanding Securities of such series delivered to the Trustee
and to the Company.

         (d)     If at any time:

                 (1)      the Trustee shall fail to comply with Section 608
         after written request therefor by the Company or by any Holder of a
         Security who has been a bona fide Holder of a Security for at least
         six months, or

                 (2)      the Trustee shall cease to be eligible under Section
         609 and shall fail to resign after written request therefor by the
         Company or by any such Holder, or

                 (3)      the Trustee shall become incapable of acting or shall
         be adjudged a bankrupt or insolvent or a receiver of the Trustee or of
         its property shall be appointed or a public officer shall take charge
         or control of the Trustee or of its property or affairs for the
         purpose of rehabilitation, conservation or liquidation, then, in any
         case, (i) the Company by a Board Resolution may remove the Trustee
         with respect to all Securities, or (ii) subject to Section 514, any
         Holder of a Security who has been a bona fide Holder of a Security for
         at least six months may, on behalf of himself and all others similarly
         situated, petition any court of competent jurisdiction for the removal
         of the Trustee with respect to all Securities and the appointment of a
         successor Trustee or Trustees.

         (e)     If the Trustee shall resign, be removed or become incapable of
acting, or if a vacancy shall occur in the office of the Trustee for any cause,
with respect to the Securities of one or more series, the Company, by a Board
Resolution, shall promptly appoint a successor Trustee or Trustees with respect
to the Securities of that or those series (it being understood that any such
successor Trustee may be appointed with respect to the Securities of one or
more or all series and that at any time there shall be only one Trustee with
respect to the Securities of any particular series) and shall comply with the
applicable requirements of Section 611.  If, within one year after such
resignation, removal or incapability, or the occurrence of such vacancy, a
successor Trustee with respect to the





                                       45
<PAGE>   53
Securities of any series shall be appointed by Act of the Holders of a majority
in principal amount of the Outstanding Securities of such series delivered to
the Company and the retiring Trustee, the successor Trustee so appointed shall,
forthwith upon its acceptance of such appointment in accordance with the
applicable requirements of Section 611, become the successor Trustee with
respect to the Securities of such series and to that extent supersede the
successor Trustee appointed by the Company.  If no successor Trustee with
respect to the Securities of any series shall have been so appointed by the
Company or the Holders of Securities of such series and accepted appointment in
the manner required by Section 611, any Holder of a Security who has been a
bona fide Holder of a Security of such series for at least six months may, on
behalf of himself and all others similarly situated, petition any court of
competent jurisdiction for the appointment of a successor Trustee with respect
to the Securities of such series.  Such court may thereupon, after such notice,
if any, as it may deem proper, appoint a successor Trustee.

         (f)     The Company shall give notice of each resignation and each
removal of the Trustee with respect to the Securities of any series and each
appointment of a successor Trustee with respect to the Securities of any series
in the manner provided in Section 106.  Each notice shall include the name of
the successor Trustee with respect to the Securities of such series and the
address of its Corporate Trust Office.

SECTION 611.  Acceptance of Appointment by Successor.

         (a)     In case of the appointment hereunder of a successor Trustee
with respect to all Securities, every such successor Trustee so appointed shall
execute, acknowledge and deliver to the Company and to the retiring Trustee an
instrument accepting such appointment, and thereupon the resignation or removal
of the retiring Trustee shall become effective and such successor Trustee,
without further act, deed or conveyance, shall become vested with all the
rights, powers, trusts and duties of the retiring Trustee, with like effect as
if originally named Trustee hereunder; but on the request of the Company or the
successor Trustee, such retiring Trustee shall, upon payment of its charges,
execute and deliver an instrument transferring to such successor Trustee all
the rights, powers and trusts of the retiring Trustee and shall duly assign,
transfer and deliver to such successor Trustee all property and money held by
such retiring Trustee hereunder.  Any Trustee ceasing to act shall,
nevertheless, retain a prior lien upon all property or funds held or collected
by such Trustee to secure any amounts then due it pursuant to the provisions of
Section 607.

         (b)     In case of the appointment hereunder of a successor Trustee
with respect to the Securities of one or more (but not all) series, the
Company, the retiring Trustee and each successor Trustee with respect to the
Securities of one or more series shall execute and deliver an indenture
supplemental hereto wherein each successor Trustee shall accept such
appointment and which (1) shall contain such provisions as shall be necessary
or desirable to transfer and confirm to, and to vest in, each successor Trustee
all the rights, powers, trusts and duties of the retiring Trustee with respect
to the Securities of that or those series to which the appointment of such
successor Trustee relates, (2) if the retiring Trustee is not retiring with
respect to all Securities, shall contain such provisions as shall be deemed
necessary or desirable to confirm that all the rights, powers, trusts and
duties of the retiring Trustee with respect to the Securities of that or those
series as to which the retiring





                                       46
<PAGE>   54
Trustee is not retiring shall continue to be vested in the retiring Trustee,
and (3) shall add to or change any of the provisions of this Indenture as shall
be necessary to provide for or facilitate the administration of the trusts
hereunder by more than one Trustee, it being understood that nothing herein or
in such supplemental indenture shall constitute such Trustees as co-trustees of
the same trust and that each such Trustee shall be trustee of a trust or trusts
hereunder separate and apart from any trust or trusts hereunder administered by
any other such Trustee; and upon the execution and delivery of such
supplemental indenture the resignation or removal of the retiring Trustee shall
become effective to the extent provided therein and each such successor
Trustee, without any further act, deed or conveyance, shall become vested with
all rights, powers, trusts and duties of the retiring Trustee with respect to
the Securities of that or those series to which the appointment of such
successor Trustee relates; but, on request of the Company or any successor
Trustee, such retiring Trustee shall duly assign, transfer and deliver to such
successor Trustee all property and money held by such retiring Trustee
hereunder with respect to the Securities of that or those series to which the
appointment of such successor Trustee relates.

         (c)     Upon request of any successor Trustee, the Company shall
execute any and all instruments for more fully and certainly vesting in and
confirming to such successor Trustee all such rights, powers and trusts
referred to in paragraph (a) or (b) of this Section, as the case may be.

         (d)     No successor Trustee shall accept its appointment unless at
the time of such acceptance such successor Trustee shall be qualified and
eligible under this Article.

SECTION 612.  Merger, Conversion, Consolidation or Succession to Business.

         Any corporation into which the Trustee may be merged or converted or
with which it may be consolidated, or any corporation resulting from any
merger, conversion or consolidation to which the Trustee shall be a party, or
any corporation succeeding to all or substantially all the corporate trust
business of the Trustee, shall be the successor of the Trustee hereunder,
provided such corporation shall be otherwise qualified and eligible under this
Article, without the execution or filing of any paper or any further act on the
part of any of the parties hereto.  In case any Securities shall have been
authenticated, but not delivered, by the Trustee then in office, any successor
by merger, conversion or consolidation to such authenticating Trustee may adopt
such authentication and deliver the Securities so authenticated with the same
effect as if such successor Trustee had itself authenticated such Securities.
As soon as practicable, the successor Trustee shall mail a notice of its
succession to the Company and the Holders of all Outstanding Securities.

SECTION 613.  Preferential Collection of Claims Against Company.

         If and when the Trustee shall be or become a creditor of the Company
(or any other obligor upon the Securities), the Trustee shall be subject to the
provisions of the Trust Indenture Act regarding the collection of claims
against the Company (or any such other obligor).





                                       47
<PAGE>   55
SECTION 614.  Appointment of Authenticating Agent.

         The Trustee may, by an instrument in writing, appoint an
Authenticating Agent or Agents with respect to one or more series of Securities
which may be authorized to act on behalf of the Trustee to authenticate
Securities of such series issued upon original issue or upon exchange,
registration of transfer or partial redemption thereof or pursuant to Section
306, and Securities so authenticated shall be entitled to the benefits of this
Indenture and shall be valid and obligatory for all purposes as if
authenticated by the Trustee hereunder.  Wherever reference is made in this
Indenture to the authentication and delivery of Securities by the Trustee or
the Trustee's certificate of authentication, such reference shall be deemed to
include authentication and delivery on behalf of the Trustee by an
Authenticating Agent.  Each Authenticating Agent shall be acceptable to the
Company and shall at all times be a bank or trust company organized and doing
business under the laws of the United States of America, any State thereof or
the District of Columbia (or, if Bearer Securities, organized and doing
business under the laws of the country in which the Bearer Securities are
eligible), authorized under such laws to act as Authenticating Agent, having a
combined capital and surplus of not less than $50,000,000 and subject to
supervision or examination by Federal or State authority (or, if Bearer
Securities, an authority of the country in which the Bearer Securities are
eligible).  If such Authenticating Agent publishes reports of condition at
least annually, pursuant to law or to the requirements of said supervising or
examining authority, then for the purposes of this Section, the combined
capital and surplus of such Authenticating Agent shall be deemed to be its
combined capital and surplus as set forth in its most recent report of
condition so published.  If at any time an Authenticating Agent shall cease to
be eligible in accordance with the provisions of this Section, such
Authenticating Agent shall resign immediately in the manner and with the effect
specified in this Section.

         Any corporation into which an Authenticating Agent may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, conversion or consolidation to which such Authenticating Agent
shall be a party, or any corporation succeeding to the corporate agency or
corporate trust business of such Authenticating Agent, shall continue to be an
Authenticating Agent, provided such corporation shall be otherwise eligible
under this Section, without the execution or filing of any paper or any further
act on the part of the Trustee or such Authenticating Agent.

         An Authenticating Agent may, and if it shall cease to be eligible
shall, resign at any time by giving written notice thereof to the Trustee and
to the Company.  The Trustee may at any time terminate the agency of an
Authenticating Agent by giving written notice thereof to such Authenticating
Agent and to the Company.  Upon receiving such notice of resignation or upon
such termination, or in case at any time such Authenticating Agent shall cease
to be eligible in accordance with the provisions of this Section, the Trustee
may appoint a successor Authenticating Agent which shall be acceptable to the
Company and shall mail written notice of such appointment by first-class mail,
postage prepaid, to all Holders of Registered Securities, if any, of the series
with respect to which such Authenticating Agent will serve, as their names and
addresses appear in the Security Register.  Any successor Authenticating Agent
upon acceptance of its appointment hereunder shall become vested with all the
rights, powers, and duties of its predecessor hereunder, with like effect





                                       48
<PAGE>   56
as if originally named as an Authenticating Agent.  No successor Authenticating
Agent shall be appointed unless eligible under the provisions of this Section.

         The Trustee agrees to pay to each Authenticating Agent from time to
time reasonable compensation for its services under this Section, and the
Trustee shall be entitled to be reimbursed for such payment, subject to the
provisions of Section 607.

         If an appointment with respect to one or more series is made pursuant
to this Section, the Securities of such series may have been endorsed thereon,
in addition to the Trustee's certificate of authentication, an alternative
certificate of authentication in the following form:

                 "This is one of the Securities of the series designated
         therein referred to in the within-mentioned Indenture.

                               Chase Bank of Texas, National Association
                                       As Trustee


                               By:                                       
                                    -------------------------------------
                                           As Authenticating Agent


                               By:                                       
                                    -------------------------------------
                                           Authorized Signatory"


         If all the Securities of a series may not be originally issued at one
time, and if the Company has an Affiliate eligible to be appointed as an
Authenticating Agent hereunder or the Trustee does not have an office capable
of authenticating Securities upon original issuance located in a Place of
Payment where the Company wishes to have Securities of such series
authenticated upon original issuance, the Trustee, if so requested by the
Company in writing (which writing need not comply with Section 102 and need not
be accompanied by an Opinion of Counsel), shall appoint in accordance with this
Section an Authenticating Agent (which, if so requested by the Company, shall
be such Affiliate of the Company) having an office in a Place of Payment
designated by the Company with respect to such series of Securities.

                                 ARTICLE SEVEN
               HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY

SECTION 701.  Company to Furnish Trustee Names and Addresses of Holders.

         With respect to each series of Securities, the Company will furnish or
cause to be furnished to the Trustee:





                                       49
<PAGE>   57
         (a)     semi-annually, not later than 15 days after a Regular Record
Date, a list, in such form as the Trustee may reasonably require, containing
all the information in the possession or control of the Company, or any of its
Paying Agents other than the Trustee, as to the names and addresses of the
Holders of Securities as of the immediately preceding Regular Record Date, and

         (b)     at such other times as the Trustee may request in writing,
within 30 days after the receipt by the Company of any such request, a list of
similar form and content as of a date not more than 15 days prior to the time
such list is furnished;

excluding from any such list names and addresses received by the Trustee in its
capacity as Security Registrar.

SECTION 702.  Preservation of Information;  Communications to Holders.

         (a)     The Trustee shall preserve, in as current a form as is
reasonably practicable, the names and addresses of Holders contained in the
most recent list furnished to the Trustee as provided in Section 701, and the
names and addresses of Holders received by the Trustee in its capacity as
Security Registrar.  The Trustee may destroy any list furnished to it as
provided in Section 701 upon receipt of a new list so furnished.

         (b)     The rights of the Holders to communicate with other Holders
with respect to their rights under this Indenture or under the Securities, and
the corresponding rights and privileges of the Trustee, shall be as provided by
the Trust Indenture Act.

         (c)     Every Holder of Securities or coupons, by receiving and
holding the same, agrees with the Company, each Subsidiary Guarantor and the
Trustee that neither the Company, any Subsidiary Guarantor nor the Trustee nor
any agent of any of them shall be held accountable by reason of any disclosure
of information as to names and addresses of Holders made pursuant to the Trust
Indenture Act and that the Trustee shall not be held accountable by reason of
mailing any material pursuant to a request made under Section 702(b).

SECTION 703.  Reports by Trustee.

         (a)     On or before August 1 in each year following the date hereof,
the Trustee shall transmit to Holders such reports concerning the Trustee and
its actions under this Indenture as may be required pursuant to the Trust
Indenture Act at the times and in the manner provided pursuant thereto.

         (b)     A copy of each such report shall, at the time of such
transmission to Holders, be filed by the Trustee with each stock exchange upon
which any Securities are listed, with the Commission and with the Company.  The
Company will notify the Trustee when any Securities are listed on any stock
exchange.





                                       50
<PAGE>   58
SECTION 704.  Reports by Company.

         In addition to the certificates delivered to the Trustee pursuant to
Section 1006, the Company shall file with the Trustee and the Commission, and
transmit to Holders, such information, documents and other reports, and such
summaries thereof, as may be required pursuant to the Trust Indenture Act at
the times and in the manner provided pursuant to such Act; provided, however,
that any such information, documents or reports required to be filed with the
Commission pursuant to Section 13 or 15(d) of the Securities Exchange Act of
1934, shall be filed with the Trustee within 15 days after the same is so
required to be filed with the Commission.

                                 ARTICLE EIGHT
              CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

SECTION 801.  Company May Consolidate, Etc., Only on Certain Terms.

         The Company shall not consolidate with or merge into any other Person
or convey, transfer or lease its properties and assets substantially as an
entirety to any Person, unless:

                 (1)      the Person formed by such consolidation or into which
         the Company is merged or the Person which acquires by conveyance or
         transfer, or which leases, the properties and assets of the Company
         substantially as an entirety shall be a corporation, partnership or
         trust, shall be organized and validly existing under the laws of the
         United States of America, any State thereof or the District of
         Columbia and shall expressly assume, by an indenture supplemental
         hereto, executed and delivered to the Trustee, in form satisfactory to
         the Trustee, the due and punctual payment of the principal of and any
         premium and interest (including all additional amounts, if any,
         payable pursuant to Section 1004) on all the Securities and the
         performance or observance of every other covenant of this Indenture on
         the part of the Company to be performed or observed;

                 (2)      immediately after giving effect to such transaction
         and treating any indebtedness which becomes an obligation of the
         Company or a Subsidiary as a result of such transaction as having been
         incurred by the Company or such Subsidiary at the time of such
         transaction, no Event of Default, and no event which, after notice or
         lapse of time or both, would become an Event of Default, shall have
         happened and be continuing; and

                 (3)      the Company has delivered to the Trustee an Officers'
         Certificate and an Opinion of Counsel, each stating that such
         consolidation, merger, conveyance, transfer or lease and such
         supplemental indenture comply with this Article and that all
         conditions precedent herein provided for relating to such transaction
         have been complied with.

SECTION 802.  Successor Substituted.

         Upon any consolidation of the Company with, or merger of the Company
into, any other Person or any conveyance, transfer or lease of the properties
and assets of the Company substantially





                                       51
<PAGE>   59
as an entirety in accordance with Section 801, the successor Person formed by
such consolidation or into which the Company is merged or to which such
conveyance, transfer or lease is made shall succeed to, and be substituted for,
and may exercise every right and power of, the Company under this Indenture
with the same effect as if such successor Person had been named as the Company
herein, and thereafter, except in the case of a lease, the predecessor Person
shall be relieved of all obligations and covenants under this Indenture and the
Securities and coupons and may liquidate and dissolve.

                                  ARTICLE NINE
                            SUPPLEMENTAL INDENTURES

SECTION 901.  Supplemental Indentures without Consent of Holders.

         Without the consent of any Holders of Securities or coupons, the
Company, when authorized by a Board Resolution, each Subsidiary Guarantor, when
authorized by a Board Resolution, and the Trustee, at any time and from time to
time, may enter into one or more indentures supplemental hereto, in form
satisfactory to the Trustee, for any of the following purposes:

                 (1)      to evidence the succession of another Person to the
         Company and the assumption by any such successor of the covenants of
         the Company herein and in the Securities pursuant to Article Eight; or

                 (2)      to add to the covenants of the Company for the
         benefit of the Holders of all or any series of Securities (and if such
         covenants are to be for the benefit of less than all series of
         Securities, stating that such covenants are expressly being included
         solely for the benefit of such series) or to surrender any right or
         power herein conferred upon the Company; or

                 (3)      to add any additional Events of Default; or

                 (4)      to add to or change any of the provisions of this
         Indenture to provide that Bearer Securities may be registrable as to
         principal, to change or eliminate any restrictions on the payment of
         principal of or any premium or interest on Bearer Securities, to
         permit Bearer Securities to be issued in exchange for Registered
         Securities, to permit Bearer Securities to be issued in exchange for
         Bearer Securities of other authorized denominations or to permit or
         facilitate the issuance of Securities in uncertificated form, provided
         that any such action shall not adversely affect the interests of the
         Holders of Securities of any series or any related coupons in any
         material respect; or

                 (5)      to add to, change or eliminate any of the provisions
         of this Indenture in respect of one or more series of Securities,
         provided that any such addition, change or elimination (A) shall
         neither (i) apply to any Security of any series created prior to the
         execution of such supplemental indenture and entitled to the benefit
         of such provision nor





                                       52
<PAGE>   60
         (ii) modify the rights of the Holder of any such Security with respect
         to such provision or (B) shall become effective only when there is no
         such Security Outstanding; or

                 (6)      to provide for adjustment of conversion rights
         pursuant to Section 1505 hereof; or

                 (7)      to establish the form or terms of Securities of any
         series and any related coupons as permitted by Sections 201 and 301;
         or

                 (8)      to evidence and provide for the acceptance of
         appointment hereunder by a successor Trustee with respect to the
         Securities of one or more series and to add to or change any of the
         provisions of this Indenture as shall be necessary to provide for or
         facilitate the administration of the trusts hereunder by more than one
         Trustee, pursuant to the requirements of Section 611(b); or

                 (9)      to secure any Securities or any Subsidiary Guarantee
         pursuant to the terms thereof; or

                 (10)     to release a Subsidiary Guarantor from its
         obligations under this Indenture and its Subsidiary Guarantee in
         accordance with the provisions hereof and thereof; or

                 (11)     to cure any ambiguity, to correct or supplement any
         provision herein or in any supplemental indenture which may be
         defective or inconsistent with any other provision herein or in any
         supplemental indenture, or to make any other provisions with respect
         to matters or questions arising under this Indenture; provided,
         however, that such action shall not adversely affect the interests of
         the Holders of Securities of any series or any related coupons in any
         material respect.

SECTION 902.  Supplemental Indentures with Consent of Holders.

         With the consent of the Holders of a majority in principal amount of
the Outstanding Securities of each series affected by such supplemental
indenture, by Act of said Holders delivered to the Company and the Trustee, the
Company, when authorized by a Board Resolution, each Subsidiary Guarantor, when
authorized by a Board Resolution, and the Trustee may enter into an indenture
or indentures supplemental hereto for the purpose of adding any provisions to
or changing in any manner or eliminating any of the provisions of this
Indenture or of modifying in any manner the rights of the Holders of Securities
of such series and any related coupons under this Indenture; provided, however,
that no such supplemental indenture shall, without the consent of the Holder of
each Outstanding Security affected thereby,

                 (1)      change the Stated Maturity of the principal of, or
         any installment of principal of or interest on, any Security, or
         reduce the principal amount thereof or the rate of interest thereon or
         any premium payable upon the redemption thereof, or change the
         Redemption Date thereof, or change any obligation of the Company to
         pay additional amounts pursuant





                                       53
<PAGE>   61
         to Section 1004 (except as contemplated by Section 801(1) and
         permitted by Section 901(1)), or reduce the amount of the principal of
         an Original Issue Discount Security that would be due and payable upon
         a declaration of acceleration of the Maturity thereof pursuant to
         Section 502 or change the coin or currency in which any Security or
         any premium or interest thereon is payable, or change any right of
         redemption, purchase or repayment by the Company at the option of the
         Holder, or adversely affect the right to convert Securities, if
         applicable, or impair the right to institute suit for the enforcement
         of (x) any such payment on or after the Stated Maturity thereof (or,
         in the case of redemption, on or after the Redemption Date) or (y) any
         conversion right with respect to any Security, or

                 (2)      reduce the percentage in principal amount of the
         Outstanding Securities of any series, the consent of whose Holders is
         required for any such supplemental indenture, or the consent of whose
         Holders is required for any waiver (of compliance with certain
         provisions of this Indenture or certain defaults hereunder and their
         consequences) provided for in this Indenture, or reduce the
         requirements of Section 1404 for quorum or voting, or

                 (3)      change any obligation of the Company to maintain an
         office or agency in the places and for the purposes specified in
         Section 1002, or

                 (4)      modify any of the provisions of this Section, Section
         513 or Section 1007 except to increase any such percentage or to
         provide that certain other provisions of this Indenture cannot be
         modified or waived without the consent of the Holder of each
         Outstanding Security affected thereby; provided, however, that this
         clause shall not be deemed to require the consent of any Holder of a
         Security or coupon with respect to changes in the references to "the
         Trustee" and concomitant changes in this Section and Section 1007 or
         the deletion of this provision, in accordance with the requirements of
         Sections 611(b) and 901(8).

A supplemental indenture which changes or eliminates any covenant or other
provision of this Indenture which has expressly been included solely for the
benefit of one or more particular series of Securities, or which modifies the
rights of the Holders of Securities of such series with respect to such
covenant or other provision, shall be deemed not to affect the rights under
this Indenture of the Holders of Securities of any other series.

         It shall not be necessary for any Act of Holders of Securities under
this Section to approve the particular form of any proposed supplemental
indenture, but it shall be sufficient if such Act shall approve the substance
thereof.

SECTION 903.  Execution of Supplemental Indentures.

         In executing, or accepting the additional trusts created by, any
supplemental indenture permitted by this Article or the modifications thereby
of the trusts created by this Indenture, the Trustee shall be entitled to
receive and (subject to Section 601) shall be fully protected in relying upon,
an Opinion of Counsel stating that the execution of such supplemental indenture
is authorized





                                       54
<PAGE>   62
or permitted by this Indenture.  The Trustee may, but shall not be obligated
to, enter into any such supplemental indenture which affects the Trustee's own
rights, duties or immunities under this Indenture or otherwise.

SECTION 904.  Effect of Supplemental Indentures.

         Upon the execution of any supplemental indenture under this Article,
this Indenture shall be modified in accordance therewith, and such supplemental
indenture shall form a part of this Indenture for all purposes; and every
Holder of Securities theretofore or thereafter authenticated and delivered
hereunder and of any coupons appertaining thereto shall be bound thereby.

SECTION 905.  Conformity with Trust Indenture Act.

         Every supplemental indenture executed pursuant to this Article shall
conform to the requirements of the Trust Indenture Act as then in effect.

SECTION 906.  Reference in Securities to Supplemental Indentures.

         Securities of any series authenticated and delivered after the
execution of any supplemental indenture pursuant to this Article may, and shall
if required by the Trustee, bear a notation in form approved by the Trustee as
to any matter provided for in such supplemental indenture.  If the Company
shall so determine, new Securities of any series so modified as to conform, in
the opinion of the Trustee and the Company, to any such supplemental indenture
may be prepared and executed by the Company and authenticated and delivered by
the Trustee in exchange for Outstanding Securities of such series and of like
tenor.

SECTION 907.     Subordination Unimpaired.

         This Indenture may not be amended to alter the subordination of any
Outstanding Securities without the written consent of each holder of Senior
Indebtedness then outstanding that would be adversely affected thereby.

                                  ARTICLE TEN
                                   COVENANTS

SECTION 1001.  Payment of Principal, Premium and Interest.

         The Company covenants and agrees for the benefit of each series of
Securities that it will duly and punctually pay the principal of and any
premium and interest on the Securities of that series in accordance with the
terms of the Securities, any coupons appertaining thereto and this Indenture.
Any such payment shall be considered duly paid on the date due if, on or before
10:30 a.m., Houston, Texas time on such date, the Trustee (or a Paying Agent
other than the Company or an Affiliate thereof) holds in accordance with this
Indenture money sufficient to pay all principal, premium and interest then due
and the Trustee or the Paying Agent, as the case may be, is not prohibited from





                                       55
<PAGE>   63
paying such money to the holders of Securities on that date pursuant to the
terms of the Indenture.  Unless otherwise specified as contemplated by Section
301 with respect to any series of Securities, any interest due on Bearer
Securities on or before Maturity shall be payable only upon presentation and
surrender of the several coupons for such interest installments as are
evidenced thereby as they severally mature.

SECTION 1002.  Maintenance of Office or Agency.

         If Securities of a series are issuable only as Registered Securities,
the Company will maintain in each Place of Payment for such series an office or
agency where Securities of that series may be presented or surrendered for
payment or, if applicable, for conversion, where Securities of that series may
be surrendered for registration of transfer or exchange and where notices and
demands to or upon the Company in respect of the Securities of that series and
this Indenture may be served.  If Securities of a series are issuable as Bearer
Securities, the Company will maintain (A) in the Borough of Manhattan, The City
of New York, an office or agency where any Registered Securities of that series
may be presented or surrendered for payment or, if applicable, for conversion,
where any Registered Securities of that series may be surrendered for
registration of transfer, where Securities of that series may be surrendered
for exchange, where notices and demands to or upon the Company in respect of
the Securities of that series and this Indenture may be served and where Bearer
Securities of that series and related coupons may be presented or surrendered
for payment in the circumstances described in the following paragraph (and not
otherwise), (B) subject to any laws or regulations applicable thereto, in a
Place of Payment for that series which is located outside the United States, an
office or agency where Securities of that series and related coupons may be
presented and surrendered for payment (including payment of any additional
amounts payable on Securities of that series pursuant to Section 1004) or, if
applicable, for conversion; provided, however, that if the Securities of that
series are listed on The International Stock Exchange of the United Kingdom and
the Republic of Ireland Limited, the Luxembourg Stock Exchange or any other
stock exchange located outside the United States and such stock exchange shall
so require, the Company will maintain a Paying Agent for the Securities of that
series in London, Luxembourg or any other required city located outside the
United States, as the case may be, so long as the Securities of that series are
listed on such exchange, and (C) subject to any laws or regulations applicable
thereto, in a Place of Payment for that series located outside the United
States an office or agency where any Registered Securities of that series may
be surrendered for registration of transfer, where Securities of that series
may be surrendered for exchange and where notices and demands to or upon the
Company in respect of the Securities of that series and this Indenture may be
served.  The Company will give prompt written notice to the Trustee and prompt
notices to the Holders as provided in Section 106 of the location, and any
change in the location, of any such office or agency.  If at any time the
Company shall fail to maintain any such required office or agency in respect of
any series of Securities or shall fail to furnish the Trustee with the address
thereof, such presentations and surrenders of Securities of that series may be
made and notices and demands may be made or served at the Corporate Trust
Office of the Trustee, except that Bearer Securities of that series and the
related coupons may be presented and surrendered for payment (including payment
of any additional amounts payable on Bearer Securities of that series pursuant
to Section 1004) or, if applicable, for conversion at any Paying Agent for such
series located outside the United States, and





                                       56
<PAGE>   64
the Company hereby appoints the same as its agents to receive such respective
presentations, surrenders, notices and demands.

         No payment of principal, premium or interest on Bearer Securities
shall be made at any office or agency of the Company in the United States or by
check mailed to any address in the United States or by transfer to an account
maintained with a bank located in the United States, provided, however, that,
if the Securities of a series are denominated and payable in Dollars payment of
principal of and any premium and interest on any Bearer Security (including any
additional amounts payable on Securities of such series pursuant to Section
1004) shall be made at the office of the Company's Paying Agent in the Borough
of Manhattan, The City of New York, if (but only if) payment in Dollars of the
full amount of such principal, premium, interest or additional amounts, as the
case may be, at all offices or agencies outside the United States maintained
for the purpose by the Company in accordance with this Indenture is illegal or
effectively precluded by exchange controls or other similar restrictions.

         The Company may also from time to time designate one or more other
offices or agencies where Securities of one or more series may be presented or
surrendered for any or all such purposes and may from time to time rescind such
designations; provided, however, that no such designation or rescission shall
in any manner relieve the Company of its obligation to so maintain an office or
agency in accordance with the requirements set forth above for Securities of
any series for such purposes.  The Company will give prompt written notice to
the Trustee and the Holders of any such designation or rescission and of any
other change in the location of any such other office or agency.

SECTION 1003.  Money for Securities Payments to Be Held in Trust.

         If the Company shall at any time act as its own Paying Agent with
respect to any series of Securities, it will, on or before each due date of the
principal of and any premium or interest on any of the Securities of that
series, segregate and hold in trust for the benefit of the Persons entitled
thereto a sum sufficient to pay the principal and any premium or interest so
becoming due until such sums shall be paid to such Persons or otherwise
disposed of as herein provided and will promptly notify the Trustee of its
action or failure to so act.

         Whenever the Company shall have one or more Paying Agents for any
series of Securities, it will, on or prior to each due date of the principal of
and any premium or interest on any Securities of that series, deposit with a
Paying Agent a sum sufficient to pay the principal and any premium or interest
so becoming due, such sum to be held in trust for the benefit of the Persons
entitled to such principal, premium or interest, and (unless such Paying Agent
is the Trustee) the Company will promptly notify the Trustee of its action or
failure to so act.

         The Company will cause each Paying Agent for any series of Securities
(other than the Company or the Trustee) to execute and deliver to the Trustee
an instrument in which such Paying Agent shall agree with the Trustee, subject
to the provisions of this Section, that such Paying Agent will (i) comply with
the provisions of the Trust Indenture Act applicable to it as a Paying Agent
and (ii) during the continuance of any default by the Company (or any other
obligor upon the Securities





                                       57
<PAGE>   65
of that series) in the making of any payment in respect of the Securities of
that series, and upon the written request of the Trustee, forthwith pay to the
Trustee all sums held in trust by such Paying Agent for payment in respect of
the Securities of that series.

         The Company may at any time, for the purpose of obtaining the
satisfaction and discharge of this Indenture or for any other purpose, pay, or
by Company Order direct any Paying Agent to pay, to the Trustee all sums held
in trust by the Company or such Paying Agent, such sums to be held by the
Trustee upon the same trusts as those upon which such sums were held by the
Company or such Paying Agent; and, upon such payment by any Paying Agent to the
Trustee, such Paying Agent shall be released from all further liability with
respect to such money.

         Any money deposited with the Trustee or any Paying Agent, or then held
by the Company, in trust for the payment of the principal of and any premium or
interest on any Security of any series and remaining unclaimed for two years
after such principal and any premium or interest has become due and payable
shall be paid to the Company on Company Request (unless otherwise required by
mandatory provisions of applicable escheat or abandoned or unclaimed property
law), or (if then held by the Company) shall be discharged from such trust; and
the Holder of such Security or any coupon appertaining thereto shall (unless
otherwise required by mandatory provisions of applicable escheat or abandoned
or unclaimed property law) thereafter, as an unsecured general creditor, look
only to the Company for payment thereof, and all liability of the Trustee or
such Paying Agent with respect to such trust money, and all liability of the
Company as trustee thereof, shall thereupon cease; provided, however, that the
Trustee or such Paying Agent, before being required to make any such repayment,
may at the expense of the Company cause to be published once, in an Authorized
Newspaper in each Place of Payment, notice that such money remains unclaimed
and that, after a date specified therein, which shall not be less than 30 days
from the date of such publication, any unclaimed balance of such money then
remaining will be repaid to the Company.

SECTION 1004.  Additional Amounts.

         If the Securities of a series provide for the payment of additional
amounts, the Company will pay to the Holder of any Security of such series or
any coupon appertaining thereto additional amounts as provided therein.
Whenever in this Indenture there is mentioned, in any context, the payment of
the principal of or any premium or interest on, or in respect of, any Security
of any series or payment of any related coupon or the net proceeds received on
the sale or exchange of any Security of any series, such mention shall be
deemed to include mention of the payment of additional amounts provided for in
this Section to the extent that, in such context, additional amounts are, were
or would be payable in respect thereof pursuant to the provisions of this
Section and express mention of the payment of additional amounts (if
applicable) in any provisions hereof shall not be construed as excluding
additional amounts in those provisions hereof where such express mention is not
made.

         If the Securities of a series provide for the payment of additional
amounts, at least 10 days prior to the first Interest Payment Date with respect
to that series of Securities (or if the Securities of that series will not bear
interest prior to Maturity, the first day on which a payment of principal and
any premium is made), and at least 10 days prior to each date of payment of
principal and any





                                       58
<PAGE>   66
premium or interest if there has been any change with respect to the matters
set forth in the below-mentioned Officers' Certificate, the Company will
furnish the Trustee and the Company's principal Paying Agent or Paying Agents,
if other than the Trustee, with an Officers' Certificate instructing the
Trustee and such Paying Agent or Paying Agents whether such payment of
principal of and any premium or interest on the Securities of that series shall
be made to Holders of Securities of that series or any related coupons who are
United States Aliens without withholding for or on account of any tax,
assessment or other governmental charge described in the Securities of that
series.  If any such withholding shall be required, then such Officers'
Certificate shall specify by country the amount, if any, required to be
withheld on such payments to such Holders of Securities or coupons and the
Company will pay to the Trustee or such Paying Agent the additional amounts
required by this Section.  The Company covenants to indemnify the Trustee and
any Paying Agent for, and to hold them harmless against, any loss, liability or
expense reasonably incurred without negligence or bad faith on their part
arising out of or in connection with actions taken or omitted by any of them in
reliance on any Officers' Certificate furnished pursuant to this Section.

SECTION 1005.  Purchase of Securities by Company or Subsidiary.

         If and so long as the Securities of a series are listed on The
International Stock Exchange of the United Kingdom and the Republic of Ireland
Limited and such stock exchange shall so require, the Company will not, and
will not permit any of its Subsidiaries to, purchase any Securities of that
series by private treaty at a price (exclusive of expenses and accrued
interest) which exceeds 120% of the mean of the nominal quotations of the
Securities of that series as shown in The Stock Exchange Daily Official List
for the last trading day preceding the date of purchase.

SECTION 1006.  Statement by Officer as to Default.

         The Company will deliver to the Trustee, within 120 days after the end
of each fiscal year of the Company ending after the date hereof, a brief
certificate from the principal executive officer, principal financial officer
or principal accounting officer as to his or her knowledge of the Company's
compliance with all conditions and covenants under this Indenture.  For
purposes of this Section 1006, such compliance shall be determined without
regard to any period of grace or requirement of notice under this Indenture.

SECTION 1007.  Waiver of Certain Covenants.

         The Company may omit in any particular instance to comply with any
term, provision or condition set forth in (i) Section 1005 with respect to the
Securities of any series or (ii) any covenant of the Company added to this
Indenture pursuant to clause (17) of Section 301 for the benefit of the Holders
of such series, if before the time for such compliance the Holders of a
majority in principal amount of the Outstanding Securities of such series
shall, by Act of such Holders, either waive such compliance in such instance or
generally waive compliance with such term, provision or condition, but no such
waiver shall extend to or affect such term, provision or condition except to
the extent so expressly waived, and, until such waiver shall become effective,
the obligations of the Company





                                       59
<PAGE>   67
and the duties of the Trustee in respect of any such term, provision or
condition shall remain in full force and effect.

                                 ARTICLE ELEVEN
                            REDEMPTION OF SECURITIES

SECTION 1101.  Applicability of Article.

         Securities of any series which are redeemable before their Stated
Maturity shall be redeemable in accordance with their terms and (except as
otherwise specified as contemplated by Section 301 for Securities of any
series) in accordance with this Article.

SECTION 1102.  Election to Redeem; Notice to Trustee.

         The election of the Company to redeem any Securities shall be
evidenced by a Board Resolution.  In the case of any redemption at the election
of the Company of less than all the Securities of any series, the Company
shall, at least 45 days prior to the Redemption Date fixed by the Company
(unless a shorter notice shall be satisfactory to the Trustee), notify the
Trustee of such Redemption Date, of the principal amount of Securities of such
series to be redeemed and, if applicable, of the tenor of the Securities of
such series to be redeemed.  In the case of any redemption of Securities (i)
prior to the expiration of any restriction on such redemption provided in the
terms of such Securities or elsewhere in this Indenture, or (ii) pursuant to an
election of the Company which is subject to a condition specified in the terms
of such Securities, the Company shall furnish the Trustee with an Officers'
Certificate evidencing compliance with such restriction or condition.

SECTION 1103.  Selection of Securities to Be Redeemed.

         If less than all the Securities of any series are to be redeemed
(unless all of the Securities of such series of a specified tenor are to be
redeemed) the particular Securities to be redeemed shall be selected not more
than 45 days prior to the Redemption Date by the Company or the Trustee, from
the Outstanding Securities of such series not previously called for redemption,
by such method as the Company or the Trustee shall deem fair and appropriate
and which may provide for the selection for redemption of portions (equal to
the minimum authorized denomination for Securities of that series or any
integral multiple thereof) of the principal amount of Registered Securities of
such series of a denomination larger than the minimum authorized denomination
for Securities of that series or of the principal amount of global Securities
of such series.  If less than all of the Securities of such series and of a
specified tenor are to be redeemed, the particular Securities to be redeemed
shall be selected not more than 45 days prior to the Redemption Date by the
Company or the Trustee, from the Outstanding Securities of such series and
specified tenor not previously called for redemption in accordance with the
preceding sentence.

         The Company or the Trustee, as the case may be, shall promptly notify
the other in writing of the Securities selected for redemption and, in the case
of any Securities selected for partial redemption, the principal amount thereof
to be redeemed.





                                       60
<PAGE>   68
         For all purposes of this Indenture, unless the context otherwise
requires, all provisions relating to the redemption of Securities shall relate,
in the case of any Securities redeemed or to be redeemed only in part, to the
portion of the principal amount of such Securities which has been or is to be
redeemed. If any Security selected for partial redemption is surrendered for
conversion after such selection, the converted portion of such Security shall
be deemed (so far as may be) to be the portion selected for redemption. Upon
any redemption of less than all the Securities of a series, for purposes of
selection for redemption the Company and the Trustee may treat as Outstanding
Securities surrendered for conversion during the period of 15 days next
preceding the mailing of a notice of redemption, and need not treat as
Outstanding any Security authenticated and delivered during such period in
exchange for the unconverted portion of any Security converted in part during
such period.

SECTION 1104.  Notice of Redemption.

         Notice of redemption shall be given in the manner provided in Section
106 to the Holders of Securities to be redeemed not less than 30 nor more than
45 days prior to the Redemption Date.

         All notices of redemption shall state:

                 (1)      the Redemption Date,

                 (2)      the Redemption Price,

                 (3)      if less than all the Outstanding Securities of any
         series are to be redeemed, the identification (and, in the case of
         partial redemption of any Securities, the principal amounts) of the
         particular Securities to be redeemed, and that on and after the
         Redemption Date, upon surrender of the Securities, new Securities of
         such series in principal amount equal to the unredeemed part thereof
         will be issued,

                 (4)      that on the Redemption Date the Redemption Price will
         become due and payable upon each such Security to be redeemed and, if
         applicable, that interest thereon will cease to accrue on and after
         said date,

                 (5)      the place or places where such Securities, together
         in the case of Bearer Securities with all coupons appertaining
         thereto, if any, maturing after the Redemption Date, are to be
         surrendered for payment of the Redemption Price,

                 (6)      that the redemption is for a sinking fund, if such is
         the case, and

                 (7)      if applicable, the Conversion Price then in effect
         and the date on which the right to convert the Securities or portions
         thereof to be redeemed will expire.

A notice of redemption published as contemplated by Section 106 need not
identify particular Registered Securities to be redeemed.





                                       61
<PAGE>   69
         If any of the Securities to be redeemed is in the form of a Book-Entry
Security, then the Company shall modify the notice of redemption to the extent
necessary to accord with the procedures of the Depository applicable to
redemption.

         Notice of redemption of Securities to be redeemed at the election of
the Company shall be given by the Company or, at the Company's request, by the
Trustee in the name and at the expense of the Company.

SECTION 1105.  Deposit of Redemption Price.

         On or prior to any Redemption Date, the Company shall deposit with the
Trustee or with a Paying Agent (or, if the Company is acting as its own Paying
Agent, segregate and hold in trust as provided in Section 1003) an amount of
money sufficient to pay the Redemption Price of, and (except if the Redemption
Date shall be an Interest Payment Date) accrued interest on, all the Securities
which are to be redeemed on that date. If any Security called for redemption is
converted pursuant hereto, any money deposited with the Trustee or any Paying
Agent or so segregated and held in trust for the redemption of such Security
shall be paid to the Company upon delivery of a Company Request to the Trustee
or such Paying Agent, or, if then held by the Company, shall be discharged from
such trust.

SECTION 1106.  Securities Payable on Redemption Date.

         Notice of redemption having been given as aforesaid, the Securities so
to be redeemed shall, on the Redemption Date, become due and payable at the
Redemption Price therein specified, and from and after such date (unless the
Company shall default in the payment of the Redemption Price and accrued
interest) such Securities shall cease to bear interest and the coupons for such
interest appertaining to any Bearer Securities so to be redeemed, except to the
extent provided below, shall be void.  Upon surrender of any such Security for
redemption in accordance with said notice, together with all coupons, if any,
appertaining thereto maturing after the Redemption Date, such Security shall be
paid by the Company at the Redemption Price, together with accrued interest to
the Redemption Date; provided, however, that installments of interest on Bearer
Securities whose Stated Maturity is on or prior to the Redemption Date shall be
payable only at an office or agency located outside the United States (except
as otherwise provided in Section 1002) and, unless otherwise specified as
contemplated by Section 301, only upon presentation and surrender of coupons
for such interest, and provided, further, that, unless otherwise specified as
contemplated by Section 301, installments of interest on Registered Securities
whose Stated Maturity is on or prior to the Redemption Date shall be payable to
the Holders of such Securities, or one or more Predecessor Securities,
registered as such at the close of business on the relevant Record Dates
according to their terms and the provisions of Section 307.

         If any Bearer Security surrendered for redemption shall not be
accompanied by all appurtenant coupons maturing after the Redemption Date, such
Security may be paid after deducting from the Redemption Price an amount equal
to the face amount of all such missing coupons, or the surrender of such
missing coupon or coupons may be waived by the Company and the Trustee if





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there be furnished to them such security or indemnity as they may require to
save each of them and any Paying Agent harmless.  If thereafter the Holder of
such Security shall surrender to the Trustee or any Paying Agent any such
missing coupon in respect of which a deduction shall have been made from the
Redemption Price, such Holder shall be entitled to receive the amount so
deducted; provided, however, that interest represented by coupons shall be
payable only at an office or agency located outside the United States (except
as otherwise provided in Section 1002) and, unless otherwise specified as
contemplated by Section 301, only upon presentation and surrender of those
coupons.

         If any Security called for redemption shall not be so paid upon
surrender thereof for redemption, the principal and any premium shall, until
paid, bear interest from the Redemption Date at the rate prescribed therefor in
the Security.

SECTION 1107.  Securities Redeemed in Part.

         Any Registered Security which is to be redeemed only in part shall be
surrendered at a Place of Payment thereof (with, if the Company or the Trustee
so requires, due endorsement by, or a written instrument of transfer in form
satisfactory to the Company and the Trustee duly executed by, the Holder
thereof or his attorney duly authorized in writing), and the Company shall
execute, and the Trustee shall authenticate and deliver to the Holder of such
Security without service charge, a new Registered Security or Securities of the
same series and of like tenor, of any authorized denomination as requested by
such Holder, in aggregate principal amount equal to and in exchange for the
unredeemed portion of the principal of the Security so surrendered.

                                 ARTICLE TWELVE
                                 SINKING FUNDS

SECTION 1201.  Applicability of Article.

         The provisions of this Article shall be applicable to any sinking fund
for the retirement of Securities of a series except as otherwise specified as
contemplated by Section 301 for Securities of such series.

         The minimum amount of any sinking fund payment provided for by the
terms of Securities of any series is herein referred to as a "mandatory sinking
fund payment", and any payment in excess of such minimum amount provided for by
the terms of Securities of any series is herein referred to as an "optional
sinking fund payment".  If provided for by the terms of Securities of any
series, the cash amount of any sinking fund payment may be subject to reduction
as provided in Section 1202.  Each sinking fund payment shall be applied to the
redemption of Securities of any series as provided for by the terms of
Securities of such series.





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SECTION 1202.  Satisfaction of Sinking Fund Payments with Securities.

         The Company (1) may deliver Outstanding Securities of a series (other
than any previously called for redemption), together in the case of any Bearer
Securities of such series with all unmatured coupons appertaining thereto, and
(2) may apply as a credit Securities of a series which have been (x) converted
into Common Stock or (y) redeemed either at the election of the Company
pursuant to the terms of such Securities or through the application of
permitted optional sinking fund payments pursuant to the terms of such
Securities, in each case in satisfaction of all or any part of any sinking fund
payment with respect to the Securities of such series required to be made
pursuant to the terms of such Securities as provided for by the terms of such
series, provided that such Securities have not been previously so credited.
Such Securities shall be received and credited for such purpose by the Trustee
at the Redemption Price specified in such Securities for redemption through
operation of the sinking fund and the amount of such sinking fund payment shall
be reduced accordingly.

SECTION 1203.  Redemption of Securities for Sinking Fund.

         Not less than 45 days prior to each sinking fund payment date for any
series of Securities, the Company will deliver to the Trustee a Company Order
specifying the amount of the next ensuing sinking fund payment for that series
pursuant to the terms of that series, the portion thereof, if any, which is to
be satisfied by payment of cash and the portion thereof, if any, which is to be
satisfied by delivering and crediting Securities of that series pursuant to
Section 1202 and will also deliver to the Trustee any Securities to be so
credited.  Not less than 30 days before each such sinking fund payment date the
Company or the Trustee shall select the Securities to be redeemed upon such
sinking fund payment date in the manner specified in Section 1103 and cause
notice of the redemption thereof to be given in the name of and at the expense
of the Company in the manner provided in Section 1104.  Such notice having been
duly given, the redemption of such Securities shall be made upon the terms and
in the manner stated in Sections 1106 and 1107.

                                ARTICLE THIRTEEN
                       DEFEASANCE AND COVENANT DEFEASANCE

SECTION 1301.  Company's Option to Effect Defeasance or Covenant Defeasance.

         If so specified in the terms of any series of Securities in accordance
with Section 301, the Company may at its option by Board Resolution, at any
time, elect to have either Section 1302 or Section 1303 applied to the
Outstanding Securities of any series upon compliance with the conditions set
forth below in this Article Thirteen.

SECTION 1302.  Defeasance and Discharge.

         Upon the Company's exercise of the option provided in Section 1301
applicable to this Section, each of the Company and the Subsidiary Guarantors
shall be deemed to have been discharged from its obligations with respect to
the Outstanding Securities of any series (other than





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<PAGE>   72
any convertible series) on the date the conditions set forth in Section 1304
are satisfied (hereinafter, "defeasance").  For this purpose, such defeasance
means that the Company shall be deemed to have paid and discharged the entire
indebtedness represented by the Outstanding Securities of such series and each
of the Company and the Subsidiary Guarantors shall be deemed to have satisfied
all its other obligations under the Securities of such series, any Subsidiary
Guarantees thereof and this Indenture insofar as the Securities of such series
are concerned (and the Trustee, at the expense of the Company, shall execute
proper instruments acknowledging the same), except for the following which
shall survive until otherwise terminated or discharged hereunder:  (A) the
rights of Holders of the Securities of such series to receive, solely from the
trust fund described in Section 1304 and as more fully set forth in such
Section, payments in respect of the principal of and any premium and interest
on the Securities of such series when such payments are due, (B) the Company's
obligations with respect to such Securities under Sections 304, 305, 306, 1002,
1003 and 1004, (C) the rights, powers, trusts, duties and immunities of the
Trustee hereunder and (D) this Article Thirteen.  Subject to compliance with
this Article Thirteen, the Company may exercise its option under this Section
1302 notwithstanding the prior exercise of its option under Section 1303.

SECTION 1303.  Covenant Defeasance.

         Upon the Company's exercise of the option provided in Section 1301
applicable to this Section, (i) the Company shall be released from its
obligations with respect to the Securities of such series under Sections 801
and 1005 and any covenant of the Company added to this Indenture pursuant to
clause (17) of Section 301 for the benefit of the Holders of Securities of such
series, and (ii) the occurrence of an event specified in clause (4) of Section
501 (with respect to Sections 801 and 1005 and any covenant added to this
Indenture pursuant to clause (17) of Section 301 for the benefit of the Holders
of Securities of such series) shall not be deemed to be an Event of Default on
and after the date the conditions set forth in Section 1304 are satisfied
(hereinafter, "covenant defeasance"), but the remainder of this Indenture and
such Securities shall be unaffected thereby.  For this purpose, such covenant
defeasance means that the Company and any Subsidiary Guarantor may omit to
comply with and shall have no liability in respect of any term, condition or
limitation set forth in any such Section, covenant or clause, whether directly
or indirectly, by reason of any reference elsewhere herein to any such Section,
covenant or clause or by reason of any reference in any such Section, covenant
or clause to any other provision herein or in any other document, but the
remainder of this Indenture and such Securities shall be unaffected thereby.

SECTION 1304.  Conditions to Defeasance or Covenant Defeasance.

         The following shall be the conditions to application of either Section
1302 or Section 1303 to the then Outstanding Securities of any series:

                 (1)      The Company shall irrevocably have deposited or
         caused to be deposited with the Trustee (or another trustee satisfying
         the requirements of Section 609 who shall agree to comply with the
         provisions of this Article Thirteen applicable to it) as trust funds
         in trust for the purpose of making the following payments specifically
         pledged as security for, and dedicated solely to, the benefit of the
         Holders of the Securities of such series, (A) money in





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<PAGE>   73
         an amount, or (B) U.S. Government Obligations which through the
         scheduled payment of principal and interest in respect thereof in
         accordance with their terms will provide, not later than one day
         before the due date of any payment, money in an amount, or (C) a
         combination thereof, sufficient, in the opinion of a nationally
         recognized firm of independent public accountants expressed in a
         written certification thereof delivered to the Trustee, to pay and
         discharge, and which shall be applied by the Trustee (or other
         qualifying trustee) to pay and discharge, the principal of (and
         premium, if any) and each installment of interest on the Securities
         and any coupons pertaining thereto on the Stated Maturity of such
         principal (and premium, if any) or installment of interest in
         accordance with the terms of this Indenture and of the Securities of
         such series.  For this purpose, "U.S. Government Obligations" means
         securities that are (x) direct obligations of the United States of
         America for the payment of which its full faith and credit is pledged
         or (y) obligations of a Person controlled or supervised by and acting
         as an agency or instrumentality of the United States of America the
         payment of which is unconditionally guaranteed as a full faith and
         credit obligation by the United States of America, which, in either
         case, are not callable or redeemable at the option of the issuer
         thereof, and shall also include a depository receipt issued by a bank
         (as defined in Section 3(a)(2) of the Securities Act of 1933) as
         custodian with respect to any such U.S. Government Obligation or a
         specific payment of principal of or interest on any such U.S.
         Government Obligation held by such custodian for the account of the
         holder of such depository receipt, provided that (except as required
         by law) such custodian is not authorized to make any deduction from
         the amount payable to the holder of such depository receipt from any
         amount received by the custodian in respect of the U.S. Government
         Obligation or the specific payment of principal of or interest on the
         U.S.  Government Obligation evidenced by such depository receipt.

                 (2)      In the case of an election under Section 1302, the
         Company shall have delivered to the Trustee an Opinion of Counsel
         stating that (x) the Company has received from, or there has been
         published by, the Internal Revenue Service a ruling, or (y) since the
         date of this Indenture there has been a change in the applicable
         Federal income tax law, in either case to the effect that, and based
         thereon such opinion shall confirm that, the Holders of the
         Outstanding Securities of such series will not recognize income, gain
         or loss for Federal income tax purposes as a result of such deposit,
         defeasance and discharge and will be subject to Federal income tax on
         the same amounts, in the same manner and at the same times as would
         have been the case if such deposit, defeasance and discharge had not
         occurred.

                 (3)      In the case of an election under Section 1303, the
         Company shall have delivered to the Trustee an Opinion of Counsel to
         the effect that the Holders of the Outstanding Securities of such
         series will not recognize income, gain or loss for Federal income tax
         purposes as a result of such deposit and covenant defeasance and will
         be subject to Federal income tax on the same amount, in the same
         manner and at the same times as would have been the case if such
         deposit and covenant defeasance had not occurred.





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<PAGE>   74
                 (4)      No Event of Default or event which with notice or
         lapse of time or both would become an Event of Default with respect to
         the Securities of such series shall have occurred and be continuing on
         the date of such deposit or, insofar as subsections 501(5) and (6) are
         concerned, at any time during the period ending on the 91st day after
         the date of such deposit (it being understood that this condition
         shall not be deemed satisfied until the expiration of such period).

                 (5)      Such defeasance or covenant defeasance shall not
         cause the Trustee to       have a conflicting interest within the
         meaning of the Trust Indenture Act with respect to any securities of
         the Company.

                 (6)      Such defeasance or covenant defeasance shall not
         result in a breach or violation of, or constitute a default under, any
         other agreement or instrument to which the Company is a party or by
         which it is bound.

                 (7)      The Company shall have delivered to the Trustee an
         Officers' Certificate and an Opinion of Counsel, each stating that all
         conditions precedent provided for relating to either the defeasance
         under Section 1302 or the covenant defeasance under Section 1303 (as
         the case may be) have been complied with and, in the case of such
         Officers' Certificate, additionally stating that the deposit was not
         made by the Company with the intent of preferring the Holders of the
         Securities of such series over any other creditors of the Company or
         any Subsidiary Guarantor or with the intent of defeating, hindering,
         delaying or defrauding creditors of the Company or any Subsidiary
         Guarantor or others.

SECTION 1305.  Deposited Money and U.S. Government Obligations to Be Held in
               Trust; Other Miscellaneous Provisions.

         Subject to the provisions of the last paragraph of Section 1003, all
money and U.S. Government Obligations (including the proceeds thereof)
deposited with the Trustee (or other qualifying trustee -- collectively, for
purposes of this Section 1305, the "Trustee") pursuant to Section 1304 in
respect of the Securities of such series shall be held in trust and applied by
the Trustee, in accordance with the provisions of such Securities of such
series and this Indenture, to the payment, either directly or through any
Paying Agent (including the Company acting as its own Paying Agent) as the
Trustee may determine, to the Holders of the Securities of such series, of all
sums due and to become due thereon in respect of principal (and premium, if
any) and interest, but such money need not be segregated from other funds
except to the extent required by law.

         The Company shall pay and indemnify the Trustee against any tax, fee
or other charge imposed on or assessed against the U.S. Government Obligations
deposited pursuant to Section 1304 or the principal and interest received in
respect thereof other than any such tax, fee or other charge which by law is
for the account of the Holders of the Outstanding Securities.

         Anything in this Article Thirteen to the contrary notwithstanding, the
Trustee shall deliver or pay to the Company from time to time upon Company
Request any money or U.S. Government





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<PAGE>   75
Obligations held by it as provided in Section 1304 which, in the opinion of a
nationally recognized firm of independent public accountants expressed in a
written certification thereof delivered to the Trustee, are in excess of the
amount thereof which would then be required to be deposited to effect an
equivalent defeasance or covenant defeasance.

SECTION 1306.  Reinstatement.

         If the Trustee or the Paying Agent is unable to apply any money in
accordance with Section 1305 by reason of any order or judgment of any court or
governmental authority enjoining, restraining or otherwise prohibiting such
application, then the Company's obligations under this Indenture and the
Securities of such series shall be revived and reinstated as though no deposit
had occurred pursuant to this Article Thirteen until such time as the Trustee
or Paying Agent is permitted to apply all such money in accordance with Section
1305; provided, however, that if the Company makes any payment of principal of
or any premium or interest on any Security following the reinstatement of its
obligations, the Company shall be subrogated to the rights of the Holders of
the Securities of such series to receive such payment from the money held by
the Trustee or the Paying Agent.

                                ARTICLE FOURTEEN
                       MEETINGS OF HOLDERS OF SECURITIES

SECTION 1401.  Purposes for Which Meetings May Be Called.

         If Securities of a series are issuable as Bearer Securities, a meeting
of Holders of Securities of such series may be called at any time and from time
to time pursuant to this Article to make, give or take any request, demand,
authorization, direction, notice, consent, waiver or other action provided by
this Indenture to be made, given or taken by Holders of Securities of such
series.

SECTION 1402.  Call, Notice and Place of Meetings.

         (a)     The Trustee may at any time call a meeting of Holders of
Securities of any series for any purpose specified in Section 1401, to be held
at such time and at such place in the Borough of Manhattan, The City of New
York, or in London, England as the Trustee shall determine.  Notice of every
meeting of Holders of Securities of any series, setting forth the time and the
place of such meeting and in general terms the action proposed to be taken at
such meeting, shall be given, in the manner provided in Section 106, not less
than 21 nor more than 120 days prior to the date fixed for the meeting.

         (b)     In case at any time the Company, pursuant to a Board
Resolution, or the Holders of at least 10% in principal amount of the
Outstanding Securities of any series shall have requested the Trustee to call a
meeting of the Holders of Securities of such series for any purpose specified
in Section 1401, by written request setting forth in reasonable detail the
action proposed to be taken at the meeting, and the Trustee shall not have made
the first publication of the notice of such meeting within 21 days after
receipt of such request or shall not thereafter proceed to cause the meeting to





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be held as provided herein, then the Company or the Holders of Securities of
such series in the amount above specified, as the case may be, may determine
the time and the place in the Borough of Manhattan, The City of New York, or in
London, England for such meeting and may call such meeting for such purposes by
giving notice thereof as provided in subsection (a) of this Section.

SECTION 1403.  Persons Entitled to Vote at Meetings.

         To be entitled to vote at any meeting of Holders a Person shall (a) be
a Holder of one or more Securities or (b) be a Person appointed by an
instrument in writing as proxy by a Holder of one or more Securities.  The only
Persons who shall be entitled to be present or to speak at any meeting of
Holders shall be the Persons entitled to vote at such meeting and their counsel
and any representatives of the Trustee and its counsel and any representatives
of the Company and its counsel.

SECTION 1404.  Quorum; Action.

         The Persons entitled to vote a majority in principal amount of the
Outstanding Securities of a series shall constitute a quorum for a meeting of
Holders of Securities of such series.  In the absence of a quorum within 30
minutes of the time appointed for any such meeting, the meeting shall, if
convened at the request of Holders of Securities of such series, be dissolved.
In any other case the meeting may be adjourned for a period of not less than 10
days as determined by the chairman of the meeting prior to the adjournment of
such meeting.  In the absence of a quorum at any such adjourned meeting, such
adjourned meeting may be further adjourned for a period of not less than 10
days as determined by the chairman of the meeting prior to the adjournment of
such adjourned meeting.  Notice of the reconvening of any adjourned meeting
shall be given as provided in Section 1402(a), except that such notice need be
given only once not less than five days prior to the date on which the meeting
is scheduled to be reconvened.  Notice of the reconvening of an adjourned
meeting shall state expressly the percentage, as provided above, of the
principal amount of the Outstanding Securities of such series which shall
constitute a quorum.

         Except as limited by Section 512 or the proviso to the first paragraph
of Section 902, any resolution presented to a meeting (or adjourned meeting
duly reconvened at which a quorum is present as aforesaid) may be adopted by
the affirmative vote of the Holders of a majority in principal amount of the
Outstanding Securities of that series; provided, however, that, any resolution
with respect to any request, demand, authorization, direction, notice, consent,
waiver or other action which this Indenture expressly provides may be made,
given or taken by the Holders of a specified percentage, which is less than a
majority, in principal amount of the Outstanding Securities of a series may be
adopted at a meeting (or an adjourned meeting duly reconvened and at which a
quorum is present as aforesaid) by the affirmative vote of the Holders of such
specified percentage in principal amount of the Outstanding Securities of that
series.

         To the extent consistent with the terms of this Indenture, any
resolution passed or decision taken at any meeting of Holders of Securities of
any series duly held in accordance with this Section





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shall be binding on all the Holders of Securities of such series and the
related coupons, whether or not present or represented at the meeting.

SECTION 1405.  Determination of Voting Rights; Conduct and Adjournment of
               Meetings.

         (a)     Notwithstanding any other provisions of this Indenture, the
Trustee may make such reasonable regulations as it may deem advisable for any
meeting of Holders of Securities of a series in regard to proof of the holding
of Securities of such series and of the appointment of proxies and in regard to
the appointment and duties of inspectors of votes, the submission and
examination of proxies, certificates and other evidence of the right to vote,
and such other matters concerning the conduct of the meeting as it shall deem
appropriate.  Except as otherwise permitted or required by any such
regulations, the holding of Securities shall be proved in the manner specified
in Section 104 and the appointment of any proxy shall be proved in the manner
specified in Section 104 or by having the signature of the Person executing the
proxy witnessed or guaranteed by any trust company, bank or banker authorized
by Section 104 to certify to the holding of Bearer Securities.  Such
regulations may provide that written instruments appointing proxies, regular on
their face, may be presumed valid and genuine without the proof specified in
Section 104 or other proof.

         (b)     The Trustee shall, by an instrument in writing, appoint a
temporary chairman of the meeting, unless the meeting shall have been called by
the Company or by Holders of Securities as provided in Section 1402(b), in
which case the Company or the Holders of Securities of the series calling the
meeting, as the case may be, shall in like manner appoint a temporary chairman.
A permanent chairman and a permanent secretary of the meeting shall be elected
by vote of the Persons entitled to vote a majority in principal amount of the
Outstanding Securities of such series represented at the meeting.

         (c)     At any meeting each Holder of a Security of such series or
proxy shall be entitled to one vote for each $1,000 principal amount of the
Outstanding Securities of such series held or represented by him; provided,
however, that no vote shall be cast or counted at any meeting in respect of any
Security challenged as not Outstanding and ruled by the chairman of the meeting
to be not Outstanding.  The chairman of the meeting shall have no right to
vote, except as a Holder of a Security of such series or proxy.

         (d)     Any meeting of Holders of Securities of any series duly called
pursuant to Section 1402 at which a quorum is present may be adjourned from
time to time by Persons entitled to vote a majority in principal amount of the
Outstanding Securities of such series represented at the meeting; and the
meeting may be held as so adjourned without further notice.

SECTION 1406.  Counting Votes and Recording Action of Meetings.

         The vote upon any resolution submitted to any meeting of Holders of
Securities of any series shall be by written ballots on which shall be
subscribed the signatures of the Holders of Securities of such series or of
their representatives by proxy and the principal amounts and serial numbers of
the Outstanding Securities of such series held or represented by them.  The
permanent chairman of





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<PAGE>   78
the meeting shall appoint two inspectors of votes who shall count all votes
cast at the meeting for or against any resolution and who shall make and file
with the secretary of the meeting their verified written reports in duplicate
of all votes cast at the meeting.  A record, at least in duplicate, of the
proceedings of each meeting of Holders of Securities of any series shall be
prepared by the secretary of the meeting and there shall be attached to said
record the original reports of the inspectors of votes on any vote by ballot
taken thereat and affidavits by one or more persons having knowledge of the
facts setting forth a copy of the notice of the meeting and showing that said
notice was given as provided in Section 1402 and, if applicable, Section 1404.
Each copy shall be signed and verified by the affidavits of the permanent
chairman and secretary of the meeting and one such copy shall be delivered to
the Company, and another to the Trustee to be preserved by the Trustee, the
latter to have attached thereto the ballots voted at the meeting.  Any record
so signed and verified shall be conclusive evidence of the matters therein
stated.

                                ARTICLE FIFTEEN
                            CONVERSION OF SECURITIES

SECTION 1501.  Applicability of Article.

         The provisions of this Article shall be applicable to the Securities
of any series which are convertible into Common Stock or, if so provided in a
Board Resolution, Officers' Certificate or executed supplemental indenture
referred to in Sections 201 and 301 by or pursuant to which the form and terms
of the Securities of such series were established, cash in lieu thereof, as and
to the extent provided by the terms of the Securities of such series.

SECTION 1502.  Exercise of Conversion Privilege.

         In order to exercise the conversion privilege, the Holder of any
Security to be converted shall surrender such Security to the Conversion Agent
at any time during usual business hours, until and including, but not after the
close of business on the second Business Day prior to the Stated Maturity of
the principal of such Security, at its office or agency maintained for the
purpose as provided in this Indenture, accompanied by a fully executed written
notice, in substantially the form set forth on the reverse of the Security,
that the Holder elects to convert such Security or a stated portion thereof
constituting a multiple of $1,000 in principal amount, and, if such Security is
surrendered for conversion during the period between the close of business on
any record date for such Security and the opening of business on the related
Interest Payment Date and has not been called for redemption on a Redemption
Date within such period, accompanied also by payment of an amount equal to the
interest payable on such Interest Payment Date on the portion of the principal
amount of the Security being surrendered for conversion.  The Holder of any
Security at the close of business on any record date for such Security shall be
entitled to receive the interest payable on such Security on the corresponding
Interest Payment Date notwithstanding the conversion thereof after such record
date.  Such notice of conversion shall also state the name or names (and
address) in which the certificate or certificates for shares of Common Stock
shall be issued (or to whom payment in cash in lieu of Common Stock shall be
made).  Securities surrendered for conversion shall (if so required by the
Company or the Conversion Agent) be duly endorsed by, or be accompanied by a
written instrument





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<PAGE>   79
or instruments of transfer in form satisfactory to the Company and the
Conversion Agent duly executed by, the Holder or his attorney duly authorized
in writing.  As promptly as practicable after the receipt of such notice and
the surrender of such Security as aforesaid, the Company shall, subject to the
provisions of Section 1507, issue and deliver at such office or agency to such
Holder, or on his written order, a certificate or certificates for the number
of full shares of Common Stock issuable on conversion of such Security in
accordance with the provisions of such Security and cash, as provided in
Section 1503, in respect of any fraction of a share of Common Stock otherwise
issuable upon such conversion or, if so provided in a Board Resolution,
Officers' Certificate or executed supplemental indenture referred to in
Sections 201 and 301 by or pursuant to which the form and terms of the
Securities of such series were established, cash in lieu of shares of Common
Stock.  Such conversion shall be at the Conversion Price in effect, and shall
be deemed to have been effected, immediately prior to the close of business on
the date (herein called the "Date of Conversion") on which such notice in
proper form shall have been received by the Conversion Agent and such Security
shall have been surrendered as aforesaid, and the Person or Persons in whose
name or names any certificate or certificates for shares of Common Stock shall
be issuable, if any, upon such conversion shall be deemed to have become on the
Date of Conversion the holder or holders of record of the shares represented
thereby; provided, however, that any such surrender on any date when the stock
transfer books of the Company shall be closed shall constitute the Person or
Persons in whose name or names the certificate or certificates for such shares
are to be issued, if any, as the record holder or holders thereof for all
purposes at the opening of business on the next succeeding day on which such
stock transfer books are open but such conversion shall nevertheless be at the
Conversion Price in effect at the close of business on the date when such
Security shall have been so surrendered with the conversion notice in proper
form.  In the case of conversion of a portion, but less than all, of a
Security, the Company shall execute, and the Trustee shall authenticate and
deliver to the Holder thereof, at the expense of the Company, a Security or
Securities in the aggregate principal amount of the unconverted portion of the
Security surrendered.  Except as otherwise expressly provided in this
Indenture, no payment or adjustment shall be made for interest accrued on any
Security (or portion thereof) converted or for dividends or distributions on
any Common Stock issued upon conversion of any Security.  The right, if any, of
a Holder of any Security to cause the Company to redeem, purchase or repay such
Security shall terminate upon receipt by the Company of any notice of
conversion of such Security.

SECTION 1503.  Fractional Interests.

         No fractions of shares or scrip representing fractions of shares shall
be issued upon conversion of Securities.  If more than one Security shall be
surrendered for conversion at one time by the same Holder, the number of full
shares which shall be issuable upon conversion thereof shall be computed on the
basis of the aggregate principal amount of the Securities so surrendered.  If
any fraction of a share of Common Stock would, except for the provisions of
this Section 1503, be issuable on the conversion of any Security or Securities,
the Company shall make payment in lieu thereof in cash equal to the value of
such fraction computed on the basis of the Last Sale Price of one share of
Common Stock on the most recent Trading Day prior to the Date of Conversion.
"Last Sale Price" on any Trading Day shall mean (i) the closing price regular
way (or, if no closing price is reported the average of the bid and asked
prices) as reported on the New York Stock Exchange





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<PAGE>   80
Composite Tape, or (ii) if on such Trading Day the Common Stock is not listed
or admitted to trading on such exchange, the closing price regular way (or, if
no closing price is reported the average of the bid and asked prices) on the
principal national securities exchange on which the Common Stock is listed or
admitted to trading, or (iii) if not listed or admitted to trading on any
national securities exchange on such Trading Day, then the average of the
closing bid and asked prices as reported through the National Association of
Securities Dealers, Inc. on its NASDAQ National Market or other NASDAQ market
or through a similar organization if NASDAQ is no longer reporting information,
or (iv) if the Common Stock is not listed or admitted to trading on any
national securities exchange or quoted on such National Market or other NASDAQ
market on such Trading Day, then the average of the closing bid and asked
prices in the over-the- counter market as furnished by any New York Stock
Exchange member firm selected from time to time by the Company for that purpose
or (v) if not quoted by any such organization on such Trading Day, the fair
value of such Common Stock on such Trading Day, as determined by the Board of
Directors.  The term "Trading Day" shall mean each Monday, Tuesday, Wednesday,
Thursday and Friday, other than any day on which securities are not traded on
any of the above mentioned exchanges or in such markets.

SECTION 1504.  Adjustment of Conversion Price.

         The conversion price or rate (herein called the "Conversion Price")
for a series of Securities shall be as set forth in a Board Resolution,
Officers' Certificate or executed supplemental indenture referred to in
Sections 201 and 301 by or pursuant to which the form and terms of the
Securities of such series were established, and may be subject to adjustment
from time to time as set forth therein.   Whenever the Conversion Price is so
adjusted, the Company shall promptly (i) file with the Trustee and each
Conversion Agent an Officers' Certificate setting forth the Conversion Price
after such adjustment and setting forth a brief statement of the facts
requiring such adjustment, which certificate shall be conclusive evidence of
the correctness of such adjustment, and (ii) give or cause to be given a notice
of such adjustment to each Holder of Securities in the manner provided in
Section 106.

SECTION 1505.  Continuation of Conversion Privilege in Case of Merger,
               Consolidation or Sale of Assets.

         If any of the following shall occur, namely:  (a) any reclassification
or change of outstanding shares of Common Stock issuable upon conversion of any
Securities (other than a change in par value, or from par value to no par
value, or from no par value to par value, or as a result of a subdivision or
combination), (b) any consolidation or merger of the Company with or into any
other Person, or the merger of any other Person with or into the Company (other
than a merger which does not result in any reclassification, change,
conversion, exchange or cancellation of outstanding shares of Common Stock) or
(c) any conveyance, transfer or lease of the properties and assets of the
Company substantially as an entirety, then the Company, or such successor or
purchasing entity, as the case may be, shall, as a condition precedent to such
reclassification, change, consolidation, merger, conveyance, transfer or lease,
execute and deliver to the Trustee a supplemental indenture providing that the
Holder of each Security then outstanding shall have the right to convert such





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Security only into the kind and amount of shares of stock and other securities
and property (including cash) receivable upon such reclassification, change,
consolidation, merger, conveyance, transfer or lease by a holder of the number
of shares of Common Stock issuable upon conversion of such Security immediately
prior to such reclassification, change, consolidation, merger, conveyance,
transfer or lease assuming such holder of Common Stock of the Company failed to
exercise his rights of an election, if any, as to the kind or amount of
securities, cash and other property receivable upon such reclassification,
change, consolidation, merger, conveyance, transfer or lease (provided that if
the kind or amount of securities, cash and other property receivable upon such
reclassification, change, consolidation, merger, conveyance, transfer or lease
is not the same for each share of Common Stock of the Company held immediately
prior to such reclassification, change, consolidation, merger, conveyance,
transfer or lease in respect of which such rights of election shall not have
been exercised ("non-electing share"), then for the purpose of this Section
1505 the kind and amount of securities, cash and other property receivable upon
such reclassification, change, consolidation, merger, conveyance, transfer or
lease by each non-electing share shall be deemed to be the kind and amount so
receivable per share by a plurality of the non-electing shares).  Such
supplemental indenture shall provide for adjustments which shall be as nearly
equivalent as may be practicable to the adjustments provided for pursuant to
this Article Fifteen with respect to such series of Securities.  If, in the
case of any such consolidation, merger, conveyance, transfer or lease, the
stock or other securities and property (including cash) receivable thereupon or
in connection therewith by a holder of shares of Common Stock includes shares
of stock or other securities and property (including cash) of a Person other
than the successor or purchasing Person, as the case may be, in such
consolidation, merger, conveyance, transfer or lease, then such supplemental
indenture shall also be executed by such other Person and shall contain such
additional provisions to protect the interests of the Holders of the Securities
as the Board of Directors shall reasonably consider necessary by reason of the
foregoing.  The provisions of this Section 1505 shall similarly apply to
successive consolidations, mergers, conveyances, transfer or leases.

         Notice of the execution of each such supplemental indenture shall be
given to each Holder of Securities in the manner provided in Section 106.

         Neither the Trustee nor any Conversion Agent shall be under any
responsibility to determine the correctness of any provisions contained in any
such supplemental indenture relating either to the kind or amount of shares of
stock or other securities or property (including cash) receivable by Holders of
Securities upon the conversion of their Securities after any such
reclassification, consolidation, merger, conveyance, transfer or lease or to
any adjustment to be made with respect thereto, but, subject to the provisions
of Sections 601 and 603, may accept as conclusive evidence of the correctness
of any such provision, and shall be protected in relying upon, the Officers'
Certificate (which the Company shall be obligated to file with the Trustee
prior the execution of any such supplemental indenture) with respect thereto.

SECTION 1506.  Notice of Certain Events.

         If:





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                 (a)      the Company shall declare a dividend (or any other
         distribution) payable to the holders of Common Stock otherwise than in
         cash; or

                 (b)      the Company shall authorize the granting to all
         holders of Common Stock of rights, warrants or options to subscribe
         for or purchase any shares of stock of any class or of any other
         rights; or

                 (c)      the Company shall authorize any reclassification or
         change of the Common Stock (other than a subdivision or combination of
         its outstanding shares of Common Stock), or any consolidation or
         merger to which the Company is a party and for which approval of any
         stockholders of the Company is required, or the conveyance, transfer
         or lease of the properties and assets of the Company substantially as
         an entirety; or

                 (d)      there shall be authorized or ordered any voluntary or
         involuntary dissolution, liquidation or winding-up of the Company;

then, the Company shall cause to be filed at the office or agency maintained
for the purpose of conversion of the Securities as provided in Section 1002,
and shall cause to be given to each Holder of Securities, in the manner
provided in Section 106, at least 20 days before the date hereinafter specified
(or the earlier of the dates hereinafter specified, in the event that more than
one date is specified), a notice stating the date on which (1) a record is
expected to be taken for the purpose of such dividend, distribution, rights,
warrants, options or Offer or if a record is not to be taken, the date as of
which the holders of Common Stock of record to be entitled to such dividend,
distribution, rights, warrants or options or to participate in such Offer are
to be determined, or (2) such reclassification, change, consolidation, merger,
conveyance, transfer or lease, dissolution, liquidation or winding-up is
expected to become effective and the date, if any is to be fixed, as of which
it is expected that holders of Common Stock of record shall be entitled to
exchange their shares of Common Stock for securities or other property
deliverable upon such reclassification, change, consolidation, merger,
conveyance, transfer or lease, dissolution, liquidation or winding-up.

SECTION 1507.  Taxes on Conversion.

         The Company will pay any and all documentary, stamp or similar taxes
payable to the United States of America or any political subdivision or taxing
authority thereof or therein in respect of the issue or delivery of shares of
Common Stock on conversion of Securities pursuant thereto; provided, however,
that the Company shall not be required to pay any tax which may be payable in
respect of any transfer involved in the issue or delivery of shares of Common
Stock in a name other than that of the Holder of the Securities to be converted
(or payment of cash in lieu thereof to a Person other than such Holder) and no
such issue or delivery (or payment) shall be made unless and until the Person
requesting such issue or delivery (or payment) has paid to the Company the
amount of any such tax or has established, to the satisfaction of the Company,
that such tax has been paid. The Company extends no protection with respect to
any other taxes imposed in connection with conversion of Securities.





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<PAGE>   83
SECTION 1508.  Company to Provide Stock.

         The Company shall reserve, free from preemptive rights, out of its
authorized but unissued shares, sufficient shares to provide for the conversion
of convertible Securities from time to time as such Securities are presented
for conversion, provided, however, that nothing contained herein shall be
construed to preclude the Company from satisfying its obligations in respect of
the conversion of Securities by delivery of repurchased shares of Common Stock
which are held in the treasury of the Company.

         If any shares of Common Stock to be reserved for the purpose of
conversion of Securities hereunder require registration with or approval of any
governmental authority under any Federal or State law before such shares may be
validly issued or delivered upon conversion, then the Company covenants that it
will in good faith and as expeditiously as possible endeavor to secure such
registration or approval, as the case may be; provided, however, that nothing
in this Section 1508 shall be deemed to affect in any way the obligations of
the Company to convert Securities into Common Stock as provided in this Article
Fifteen.

         Before taking any action which would cause an adjustment reducing the
Conversion Price below the then par value, if any, of the Common Stock, the
Company will take all corporate action which may, in the opinion of counsel, be
necessary in order that the Company may validly and legally issue fully paid
and non-assessable shares of Common Stock at such adjusted Conversion Price.

         The Company covenants that all shares of Common Stock which may be
issued upon conversion of Securities will upon issue be fully paid and
non-assessable by the Company and free of preemptive rights.

SECTION 1509.  Disclaimer of Responsibility for Certain Matters.

         Neither the Trustee, any Conversion Agent nor any agent of either
shall at any time be under any duty or responsibility to any Holder of
Securities to determine whether any facts exist which may require any
adjustment of the Conversion Price, or with respect to the nature or extent of
any such adjustment when made, or with respect to the method employed, or
herein or in any supplemental indenture provided to be employed, in making the
same. Neither the Trustee, any Conversion Agent nor any agent of either shall
be accountable with respect to the validity or value (or the kind or amount) of
any shares of Common Stock, or of any securities or property (including cash),
which may at any time be issued or delivered upon the conversion of any
Security, and neither the Trustee, any Conversion Agent nor any agent of either
makes any representation with respect thereto. Neither the Trustee, any
Conversion Agent nor any agent of either shall be responsible for any failure
of the Company to issue, register the transfer of or deliver any shares of
Common Stock or stock certificates or other securities or property (including
cash) upon the surrender of any Security for the purpose of conversion or,
subject to Sections 601 and 603, to comply with any of the covenants of the
Company contained in this Article Fifteen.





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<PAGE>   84
SECTION 1510.  Return of Funds Deposited for Redemption of Converted Securities.

         Any funds which at any time shall have been deposited by the Company
or on its behalf with the Trustee or any Paying Agent for the purpose of paying
the principal of and any premium and interest on any of the Securities and
which shall not be required for such purposes because of the conversion of such
Securities, as provided in this Indenture, shall forthwith after such
conversion be repaid to the Company by the Trustee or such Paying Agent.

                                ARTICLE SIXTEEN
                                 SUBORDINATION

SECTION 1601.  Securities Subordinated to Senior Indebtedness.

         The Company covenants and agrees that anything in this Indenture to
the contrary notwithstanding, the indebtedness evidenced by the Securities of
each series is subordinate and junior in right of payment to all Senior
Indebtedness to the extent provided herein or, if so provided in a Board
Resolution, Officers' Certificate or executed supplemental indenture referred
to in Sections 201 and 301 by or pursuant to which the form and terms of the
Securities of such series were established, as and to the extent provided by
the terms of the Securities of such series, and each Holder of Securities of
each series, by his acceptance thereof, likewise covenants and agrees to the
subordination herein or therein provided and shall be bound by the provisions
hereof or thereof.

         The provisions of this Article Sixteen applicable to any series of
Securities shall constitute a continuing offer to all Persons who, in reliance
upon such provisions, become holders of, or continue to hold, Senior
Indebtedness, and such provisions are made for the benefit of the holders of
Senior Indebtedness, and such holders are made obligees hereunder and any one
or more of them may enforce such provisions.

         No payment may be made by the Company on account of the principal of
or any premium or interest on the Securities, or to acquire any of the
Securities (including repurchases of Securities at the option of the Holders)
for cash or property (other than Junior Securities), or on account of any
redemption provisions of the Securities, (i) upon the maturity of any Senior
Indebtedness of the Company by lapse of time, acceleration (unless waived) or
otherwise, unless and until all principal of and any premium and interest on
such Senior Indebtedness are first paid in full (or such payment is duly
provided for) or (ii) in the event of default in the payment of any principal
of or any premium or interest on any Senior Indebtedness when it becomes due
and payable, whether at stated maturity or at a date fixed for prepayment or by
declaration or otherwise (a "Payment Default"), unless and until such Payment
Default has been cured or waived or otherwise has ceased to exist.

         Upon (i) the happening of an event of default (other than a Payment
Default) that permits the holders of Senior Indebtedness or their
representative immediately to accelerate its maturity and (ii) written notice
of such event of default given to the Company and the Trustee by the holders of
at least 25% in aggregate principal amount outstanding of such Senior
Indebtedness or their representative (a "Payment Notice"), then, unless and
until such event of default has been cured or





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<PAGE>   85
waived or otherwise has ceased to exist, no payment (by set off or otherwise)
may be made by or on behalf of the Company on account of the principal of or
any premium or interest on the Securities, or to acquire or repurchase any of
the Securities for cash or property, or on account of any redemption provisions
of the Securities, in any such case other than payments made with Junior
Securities of the Company.  Notwithstanding the foregoing, unless (i) the
Senior Indebtedness in respect of which such event of default exists has been
declared due and payable in its entirety within 179 days after the Payment
Notice is delivered as set forth above (the "Payment Blockage Period"), and
(ii) such declaration has not been rescinded or waived, at the end of the
Payment Blockage Period, the Company shall be required to pay all sums not paid
to the Holders of the Securities during the Payment Blockage Period due to the
foregoing prohibitions and to resume all other payments as and when due on the
Securities.  Any number of Payment Notices may be given; provided, however,
that (i) not more than one Payment Notice shall be given within a period of any
360 consecutive days and (ii) no event of default that existed upon the date of
such Payment Notice or the commencement of such Payment Blockage Period
(whether or not such event of default is on the same issue of Senior
Indebtedness) shall be made the basis for the commencement of any other Payment
Blockage Period.

         Upon any distribution of assets of the Company upon any dissolution,
winding-up, liquidation or reorganization of the Company, whether voluntary of
involuntary, in bankruptcy, insolvency, receivership or a similar proceeding or
upon assignment for the benefit of creditors or any marshaling of assets or
liabilities:  (i) the holders of all Senior Indebtedness shall first be
entitled to receive payments in full (or have such payment duly provided for)
before the Holders are entitled to receive any payment on account of the
principal of or any premium or interest on the Securities (other than Junior
Securities); and (ii) any payment or distribution of assets of the Company of
any kind or character, whether in cash, property or securities (other than
Junior Securities), to which the Holders or the Trustee on behalf of the
Holders would be entitled (by set off or otherwise), except for the provisions
of this Article Sixteen, shall be paid by the liquidating trustee or agent or
other Person making such a payment or distribution directly to the holders of
Senior Indebtedness or their representative to the extent necessary to make
payment in full of all such Senior Indebtedness remaining unpaid, after giving
effect to any concurrent payment or distribution to the holders of such Senior
Indebtedness.

         In the event that, notwithstanding the foregoing provisions of this
Section 1601, any payment or distribution of assets of the Company (other than
Junior Securities) shall be received by the Trustee or the Holders at a time
when such payment or distribution is prohibited by the provisions of this
Section 1601, then such payment or distribution (subject to the provisions of
Section 1603 shall be received and held in trust by the Trustee or such Holders
for the benefit of the holders of Senior Indebtedness, and shall be paid or
delivered by the Trustee or such Holders, as the case may be, to the holders of
Senior Indebtedness remaining unpaid or unprovided for or their representative
or representatives, or to the trustee or trustees under any indenture pursuant
to which any instruments evidencing any of such Senior Indebtedness may have
been issued, ratably according to the aggregate amounts remaining unpaid on
account of the Senior Indebtedness held or represented by each, for application
to the payment of all Senior Indebtedness remaining unpaid to the extent
necessary to





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pay or to provide for the payment of all such Senior Indebtedness in full after
giving effect to any concurrent payment and distribution to the holders of such
Senior Indebtedness.

         The failure to make a payment on account of principal of or any
premium or interest on the Securities of any series by reason of any provision
of this Article Sixteen shall not be construed as preventing the occurrence of
an Event of Default.  Nothing contained herein shall impair, as between the
Company and the Holders of Securities of each series, the obligation of the
Company, which is absolute and unconditional, to pay to such Holders the
principal of and any premium and interest on such Securities as and when the
same shall become due and payable in accordance with their terms or prevent the
Trustee or any Holder from exercising all rights, powers and remedies otherwise
permitted by applicable law or hereunder upon a default or Event of Default
hereunder, all subject to the rights of the holders of the Senior Indebtedness
to receive cash, securities or other property otherwise payable or deliverable
to the Holders.

         Senior Indebtedness shall not be deemed to have been paid in full
unless the holders thereof shall have received cash, securities or other
property equal to the amount of such Senior Indebtedness then outstanding. Upon
the payment in full of all Senior Indebtedness, the Holders of Securities of
each series shall be subrogated to all rights of any holders of Senior
Indebtedness to receive any further payments or distributions applicable to the
Senior Indebtedness until the indebtedness evidenced by the Securities of such
series shall have been paid in full, and such payments or distributions
received by such Holders, by reason of such subrogation, of cash, securities or
other property which otherwise would be paid or distributed to the holders of
Senior Indebtedness, shall, as between the Company and its creditors other than
the holders of Senior Indebtedness, on the one hand, and such Holders, on the
other hand, be deemed to be a payment by the Company on account of Senior
Indebtedness, and not on account of the Securities of such series.

         The provisions of this Section 1601 shall not impair any rights,
interests, remedies or powers of any secured creditor of the Company in respect
of any security interest the creation of which is not prohibited by the
provisions of this Indenture.

         The securing of any obligations of the Company, otherwise ranking on a
parity with the Securities or ranking junior to the Securities, shall not be
deemed to prevent such obligations from constituting, respectively, obligations
ranking on a parity with the Securities or ranking junior to the Securities.

SECTION 1602.  Reliance on Certificate of Liquidating Agent; Further Evidence
               as to Ownership of Senior Indebtedness.

         Upon any payment or distribution of assets of the Company, the Trustee
and the Holders shall be entitled to rely upon an order or decree issued by any
court of competent jurisdiction in which such dissolution or winding-up or
liquidation or reorganization proceedings are pending or upon a certificate of
the trustee in bankruptcy, receiver, assignee for the benefit of creditors or
other Person making such payment or distribution, delivered to the Trustee or
to the Holders, for the purpose of ascertaining the Persons entitled to
participate in such distribution, the holders of the Senior





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Indebtedness and other indebtedness of the Company, the amount thereof or
payable thereon, the amount or amounts paid or distributed thereon and all
other facts pertinent thereto or to this Article Sixteen. In the absence of any
such bankruptcy trustee, receiver, assignee or other Person, the Trustee shall
be entitled to rely upon a written notice by a Person representing himself to
be a holder of Senior Indebtedness (or a trustee or representative on behalf of
such holder) as evidence that such Person is a holder of Senior Indebtedness
(or is such a trustee or representative). If the Trustee determines, in good
faith, that further evidence is required with respect to the right of any
Person as a holder of Senior Indebtedness to participate in any payment or
distribution pursuant to this Article Sixteen, the Trustee may request such
Person to furnish evidence to the reasonable satisfaction of the Trustee as to
the amount of Senior Indebtedness held by such Person, as to the extent to
which such Person is entitled to participate in such payment or distribution,
and as to other facts pertinent to the rights of such Person under this Article
Sixteen, and if such evidence is not furnished, the Trustee may defer any
payment to such Person pending judicial determination as to the right of such
Person to receive such payment.

SECTION 1603.  Application by Trustee of Assets Deposited with It.

         Amounts deposited in trust with the Trustee pursuant to and in
accordance with Article Thirteen shall be for the sole benefit of Holders of
Securities of each series subject thereto and, to the extent allocated for the
payment of such Securities, shall not be subject to the subordination
provisions of this Article Sixteen.  Otherwise, any deposit of assets with the
Trustee (whether or not in trust) for the payment of the principal of or any
premium or interest on any Securities shall be subject to the provisions of
this Article Sixteen; provided, however, if prior to one Business Day preceding
the date on which by the terms of this Indenture any such assets may become
distributable for any purpose (including, without limitation, the payment of
the principal of or any premium or interest on any Security) the Trustee shall
not have received with respect to such assets the Officers' Certificate or
written notice provided for in Section 1605, then the Trustee shall have full
power and authority to receive such assets and to apply the same to the purpose
for which they were received.

SECTION 1604.  Disputes with Holders of Certain Senior Indebtedness.

         Any failure by the Company to make any payment on or under any Senior
Indebtedness, other than any Senior Indebtedness as to which the provisions of
this Section 1604 shall have been waived by the Company in the instrument or
instruments by which the Company incurred, assumed, guaranteed or otherwise
created such Senior Indebtedness, shall not be deemed a default under Section
1601 if (i) the Company shall be disputing its obligation to make such payment
or perform such obligation, and (ii) either (A) no final judgment relating to
such dispute shall have been issued against the Company which is in full force
and effect and is not subject to further review, including a judgment that has
become final by reason of the expiration of the time within which a party may
seek further appeal or review, or (B) in the event of a judgment that is
subject to further review or appeal has been issued, the Company shall in good
faith be prosecuting an appeal or other proceeding for review, and a stay of
execution shall have been obtained pending such appeal or review.





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<PAGE>   88
SECTION 1605.  Trustee Not Charged with Knowledge of Prohibition.

         Anything in this Article Sixteen or elsewhere in this Indenture
contained to the contrary notwithstanding, the Trustee shall not at any time be
charged with knowledge of the existence of any facts which would prohibit the
making of any payment of moneys to or by Trustee and shall be entitled to
assume conclusively that no such facts exist, unless and until the Trustee
shall have received an Officers' Certificate to that effect or notice in
writing to that effect signed by or on behalf of the holder or holders, or
their representatives, of Senior Indebtedness who shall have been certified by
the Company or otherwise established to the reasonable satisfaction of the
Trustee to be such holder or holders or representatives or from any trustee
under any indenture pursuant to which such Senior Indebtedness shall be
outstanding; provided, however, that, if the Trustee shall not have received
the Officers' Certificate or notice provided for in this Section 1605 at least
one Business Day preceding the date upon which by the terms hereof any such
moneys may become payable for any purpose (including, without limitation, the
payment of the principal of or any premium or interest on any Security), then,
anything herein contained to the contrary notwithstanding, the Trustee shall
have full power and authority to receive such moneys and apply the same to the
purpose for which they were received and shall not be affected by any notice to
the contrary which may be received by it within one Business Day preceding such
date. The Company shall give prompt written notice to the Trustee and to each
Paying Agent of any facts which would prohibit any payment of moneys to or by
the Trustee or any Paying Agent, and the Trustee shall not be charged with
knowledge of the curing of any default or the elimination of any other fact or
condition preventing such payment or distribution unless and until the Trustee
shall have received an Officers' Certificate to such effect.

SECTION 1606.  Trustee to Effectuate Subordination.

         Each Holder of Securities by his acceptance thereof authorizes and
directs the Trustee on his behalf to take such action as may be necessary or
appropriate to effectuate the subordination as between such Holder and holders
of Senior Indebtedness as provided in this Article Sixteen and appoints the
Trustee its attorney-in-fact for any and all such purposes, including, in the
event of any dissolution, winding-up, liquidation or reorganization of the
Company (whether in bankruptcy, insolvency or receivership proceedings or upon
an assignment for the benefit of creditors of the Company), the immediate
filing of a claim for the unpaid balance of his Securities in the form required
in said proceedings and cause said claim to be approved.  If the Trustee does
not file a proper claim or proof of debt in the form required in such
proceeding prior to 30 days before the expiration of the time to file such
claim or claims, then the holders of the Senior Indebtedness or their
representative is hereby authorized to have the right to file and is hereby
authorized to file an appropriate claim for and on behalf of the Holders of
said Securities.  Nothing herein contained shall be deemed to authorize the
Trustee or the holders of Senior Indebtedness or their representative to
authorize or consent to or accept or adopt on behalf of any Securityholder any
plan of reorganization, arrangement, adjustment or composition affecting the
Securities or the rights of any Holder thereof, or to authorize the Trustee or
the holders of Senior Indebtedness or their representative to vote in respect
of the claim of any Securityholder in any such proceeding.





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SECTION 1607.  Rights of Trustee as Holder of Senior Indebtedness.

         The Trustee shall be entitled to all the rights set forth in this
Article Sixteen with respect to any Senior Indebtedness which may at the time
be held by it, to the same extent as any other holder of Senior Indebtedness
and nothing in this Indenture shall deprive the Trustee of any of its rights as
such holder. Nothing in this Article Sixteen shall apply to claims of, or
payments to, the Trustee under or pursuant to Section 607.

SECTION 1608.  Article Applicable to Paying Agents.

         In case at any time any Paying Agent other than the Trustee shall have
been appointed by the Company and be then acting hereunder, the term "Trustee"
as used in this Article Sixteen shall in such case (unless the context shall
otherwise require) be construed as extending to and including such Paying Agent
within its meaning as fully for all intents and purposes as if the Paying Agent
were named in this Article Sixteen in addition to or in place of the Trustee;
provided, however, that Sections 1605 and 1607 shall not apply to the Company
if its acts as Paying Agent.

SECTION 1609.  Subordination Rights Not Impaired by Acts or Omissions of the
               Company or Holders of Senior Indebtedness.

         No right of any present or future holders of any Senior Indebtedness
to enforce subordination as herein provided shall at any time in any way be
prejudiced or impaired by any act or failure to act on the part of the Company
or by any act or failure to act, in good faith, by any such holder, or by any
noncompliance by the Company with the terms, provisions and covenants of this
Indenture, regardless of any knowledge thereof which any such holder may have
or be otherwise charged with.  The holders of Senior Indebtedness may, at any
time or from time to time and in their absolute discretion, change the manner,
place or terms of payment, change or extend the time of payment of, or renew or
alter, any such Senior Indebtedness, or amend or supplement any instrument
pursuant to which any such Senior Indebtedness is issued or by which it may be
secured, or release any security therefor, or exercise or refrain from
exercising any other of their rights under the Senior Indebtedness, including,
without limitation, the waiver of default thereunder, all without notice to or
assent from the Holders of the Securities or the Trustee and without affecting
the obligations of the Company, the Trustee or the Holders of Securities under
this Article Sixteen.

SECTION 1610.  Trustee Not Fiduciary for Holders of Senior Indebtedness.

         The Trustee shall not be deemed to owe any fiduciary duty to the
holders of the Senior Indebtedness, and shall not be liable to any such holders
if it shall mistakenly pay over or distribute money or assets to
Securityholders or the Company.

SECTION 1611.  Subordination of Subsidiary Guarantees.

         The obligations of each Subsidiary Guarantor under any Subsidiary
Guarantee relating to a series of Securities issued pursuant to this Indenture
shall be subordinated to the Senior Indebtedness





                                       82
<PAGE>   90
of such Subsidiary Guarantor to the same extent and in the same manner as the
Securities of such series are subordinated to Senior Indebtedness of the
Company, or, if so provided in a Board Resolution, Officers' Certificate or
executed supplemental indenture referred to in Sections 201 and 301 by or
pursuant to which the form and terms of the Securities of such series and the
related Subsidiary Guarantees were established, as and to the extent provided
by the terms thereof, and each Holder of Securities of each series, by his
acceptance thereof, likewise covenants and agrees to the subordination herein
or therein provided and shall be bound by the provisions hereof or thereof.
For the purposes of the foregoing sentence, the Trustee and the holders of
Securities shall have the right to receive or retain payments by any of the
Subsidiary Guarantors only at such times as they may receive or retain payments
in respect of the Securities pursuant to this Indenture.

                     -----------------------------------

         This instrument may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.





                                       83
<PAGE>   91
         IN WITNESS WHEREOF, the parties hereto have caused this Indenture to
be duly executed, all as of the day and year first above written.

                                     MARINE DRILLING COMPANIES, INC.

                                     By:                                      
                                        --------------------------------------
                                     Name:                                    
                                          ------------------------------------
                                     Title:                                   
                                           -----------------------------------

                                     CHASE BANK OF TEXAS, NATIONAL ASSOCIATION,
                                     AS TRUSTEE

                                     By:                                      
                                        --------------------------------------
                                     Name:                                    
                                          ------------------------------------
                                     Title:                                   
                                           -----------------------------------

                                     SUBSIDIARY GUARANTORS:

                                     MARINE DRILLING MANAGEMENT COMPANY

                                     By:                                      
                                        --------------------------------------
                                     Name:                                    
                                          ------------------------------------
                                     Title:                                   
                                           -----------------------------------

                                     MARINE DRILLING INTERNATIONAL, INC.

                                     By:                                      
                                        --------------------------------------
                                     Name:                                    
                                          ------------------------------------
                                     Title:                                   
                                           -----------------------------------

                                     MARINE 300 SERIES, INC.

                                     By:                                      
                                        --------------------------------------
                                     Name:                                    
                                          ------------------------------------
                                     Title:                                   
                                           -----------------------------------






                                       84
<PAGE>   92
                                   EXHIBIT A

                       FORM OF CERTIFICATE TO BE GIVEN BY
                              BENEFICIAL OWNER OF
                    INTEREST IN A TEMPORARY GLOBAL SECURITY

                        MARINE DRILLING COMPANIES, INC.

                             [Title of Securities]

                               (the "Securities")

         This is to certify that as of the date hereof, and except as set forth
below, the above-captioned Securities held by you for our account (i) are owned
by person(s) that are not citizens or residents of the United States, domestic
partnerships, domestic corporations or any estate or trust the income of which
is subject to United States Federal income taxation regardless of its source
("United States persons"), (ii) are owned by United States person(s) that are
(A) foreign branches of United States financial institutions (as defined in
U.S. Treasury Regulations Section 1.165-12(c)(1)(v)) ("financial institutions")
purchasing for their own account or for resale, or (B) United States person(s)
who acquired Securities through the foreign branches of the United States
financial institutions and who hold the Securities through such United States
financial institutions on the date hereof (and in either case (A) or (B), each
such United States financial institution hereby agrees, on its own behalf or
through its agent, to comply with the requirements of Section 165(j)(3)(A), (B)
or (C) of the Internal Revenue Code of 1986 as amended, and the regulations
thereunder), or (iii) are owned by United States or foreign financial
institution(s) for purposes of resale during the restricted period (as defined
in U.S. Treasury Regulations Section 1.163-5(c)(2)(i)(D)(7)), and in addition
if the owner of the Securities is a United States or foreign financial
institution described in clause (iii) above (whether or not also described in
clause (i) or (ii)), this is to further certify that such financial institution
has not acquired the Securities for purposes of resale directly or indirectly
to a United States person or to a person within the United States or its
possessions.

         If the Securities are of the category contemplated in Section
230.903(c)(3) of Regulation S under the Securities Act of 1933, as amended (the
"Act"), then this is also to certify that, except as set forth below (i) in the
case of debt securities, the Securities are beneficially owned by (a) non-U.S.
person(s) or (b) U.S. person(s) who purchased the Securities in transactions
which did not require registration under the Act; or (ii) in the case of equity
securities, the Securities are owned by (x) non-U.S. person(s) (and such
person(s) are not acquiring the Securities for the account or benefit of U.S.
person(s)), or (y) U.S. person(s) who purchased the Securities in a transaction
which did not require registration under the Act.  If this certification is
being delivered in connection with the exercise of warrants pursuant to Section
230.902(m) of Regulation S under the Act, then this is further to certify that,
except as set forth below, the Securities are being exercised by and on behalf
of non-U.S. person(s).  As used in this paragraph, the term "U.S. person" has
the meaning given to it by Regulation S under the Act.

         As used herein, "United States" or "U.S." means the United States of
America (including the States and District of Columbia); and its "possessions"
include Puerto Rico, the U.S. Virgin Islands, Guam, American Samoa, Wake Island
and the Northern Mariana Islands.





                                      A-1
<PAGE>   93
         We undertake to advise you promptly by tested telex on or prior to the
date on which you intend to submit your certification relating to the
Securities held by you for our account in accordance with your Operating
Procedures if any applicable statement herein is not correct on such date, and
in the absence of any such notification it may be assumed that this
certification applies as of such date.

         This certification excepts and does not relate to $_________ of such
interest in the above Securities in respect of which we are not able to certify
and as to which we understand exchange and delivery of definitive Securities
(or, if relevant, exercise of any rights or collection of any interest) cannot
be made until we do so certify.

         We understand that this certification is required in connection with
certain tax laws and, if applicable, certain securities laws of the United
States.  In connection therewith, if administrative or legal proceedings are
commenced or threatened in connection with which this certification is or would
be relevant, we irrevocably authorize you to produce this certification to any
interested party in such proceedings.

*Dated: 
        ---------------

                                    NAME OF PERSON MAKING CERTIFICATION



                                    By:
                                       -------------------------------------





- ---------------
* To be dated no earlier than the Certification Date.





                                      A-2
<PAGE>   94
                                   EXHIBIT B

                    FORM OF CERTIFICATION TO BE GIVEN BY THE
                       EURO-CLEAR OPERATOR OR CEDEL S.A.

                        MARINE DRILLING COMPANIES, INC.

                             [Title of Securities]

                               (the "Securities")

         This is to certify that, based solely on certifications we have
received in writing, by tested telex or by electronic transmission from member
organizations appearing in our records as persons being entitled to a portion
of the principal amount set forth below (our "Member Organizations")
substantially to the effect set forth in the Indenture, dated as of __________,
1998, between Marine Drilling Companies, Inc., the Subsidiary Guarantors named
therein and Chase Bank of Texas, National Association, as of the date hereof, [
] principal amount of the above-captioned Securities (i) is owned by persons
that are not citizens or residents of the United States, domestic partnerships,
domestic corporations or any estate or trust the income of which is subject to
United States Federal income taxation regardless of its source ("United States
persons"), (ii) is owned by United States persons that are (A) foreign branches
of United States financial institutions (as defined in U.S. Treasury
Regulations Section 1.16512(c)(1)(v)) ("financial institutions") purchasing for
their own account or for resale, or (B) United States persons who acquired the
Securities through foreign branches of United States financial institutions and
who hold the Securities through such United States financial institutions on
the date hereof (and in either case (A) or (B), each such United States
financial institution has agreed, on its own behalf or through its agent, that
it will comply with the requirements of Section 165(1)(3)(A), (B) or (C) of the
Internal Revenue Code of 1986, as amended, and the regulations thereunder), or
(iii) is owned by United States or foreign financial institutions for purposes
of resale during the restricted period (as defined in U.S.  Treasury
Regulations Section 1.1635(c)(2)(i)(D)(7)), and to the further effect that the
United States or foreign financial institutions described in clause (iii) above
(whether or not also described in clause (i) or (ii)) have certified that they
have not acquired the Securities for purposes of resale directly or indirectly
to a United States person or to a person within the United States or its
possessions.

         If the Securities are of the category contemplated in Section
230.903(c)(3) of Regulation S under the Securities Act of 1933, as amended,
then this is also to certify with respect to such principal amount of
Securities set forth above that, except as set forth below, we have received in
writing, by tested telex or by electronic transmission, from our Member
Organizations entitled to a portion of such principal amount, certifications
with respect to such portion, substantially to the effect set forth in the
Indenture.

         We further certify (i) that we are not making available herewith for
exchange (or, if relevant, exercise of any rights or collection of any
interest) any portion of the temporary global Security excepted in such
certifications and (ii) that as of the date hereof we have not received any
notification from any of our Member Organizations to the effect that the
statements made by such Member Organizations with respect to any portion of the
part submitted herewith for exchange (or, if relevant, exercise of any rights
or collection of any interest) are no longer true and cannot be relied upon as
of the date hereof.





                                      B-1
<PAGE>   95
         We understand that this certification is required in connection with
certain tax laws and, if applicable, certain securities laws of the United
States.  In connection therewith, if administrative or legal proceedings are
commenced or threatened in connection with which this certification is or would
be relevant, we irrevocably authorize you to produce this certification or a
copy hereof to any interested party in such proceedings.

Dated: 
      ----------------------------------
(dated the Exchange Date or the Interest
Payment Date)

                                        [Morgan Guaranty Trust Company of New
                                        York, as operator of the Euro-clear
                                        System]

                                        or

                                        [CEDEL S.A.]


                                        By:                                  
                                           ------------------------------------






                                      B-2

<PAGE>   1
                                                                    Exhibit 5.1

                       [VINSON & ELKINS L.L.P. LETTERHEAD]



                                  June 9, 1998


Marine Drilling Companies, Inc.
One Sugar Creek Center Boulevard
Suite 600
Sugar Land, Texas  77478

Ladies and Gentlemen:

     We have acted as counsel to Marine Drilling Companies, Inc., a Texas
corporation ("Marine"), in connection with the preparation of the Registration
Statement on Form S-3 (the "Registration Statement") filed on even date herewith
with the Securities and Exchange Commission (the "Commission") under the
Securities Act of 1933, as amended (the "Securities Act"), with respect to (a)
Marine's (i) unsecured debt securities ("Debt Securities"), in one or more
series, which may be senior, senior subordinated or subordinated in priority of
payment, certain of which may be convertible or exchangeable into common stock,
par value $.01 per share, of Marine ("Common Stock") (including the attached
preferred share purchase rights); (ii) warrants to purchase Common Stock
("Warrants"); (iii) shares of preferred stock, par value $.01 per share, of
Marine ("Preferred Stock"), which may be convertible into shares of Common Stock
or exchangeable for Debt Securities; (iv) shares of Common Stock; and (v)
guarantees by certain subsidiaries of Marine named in the Registration Statement
(the "Subsidiary Guarantors") with respect to the Debt Securities (the
"Guarantees") (such Debt Securities, Preferred Stock, Warrants, Common Stock and
Guarantees are collectively referred to herein as the "Securities"), which
Securities may be issued from time to time pursuant to Rule 415 under the
Securities Act for an aggregate initial offering price not to exceed
$223,770,500.

     We have examined originals or copies, certified or otherwise identified to
our satisfaction, of (i) the Restated Articles of Incorporation and Bylaws of
Marine, each as amended to the date hereof, (ii) the Indenture (the "Senior
Indenture") to be entered into between Marine, the Subsidiary Guarantors and
Chase Bank of Texas, National Association, as Trustee, in the form included as
an exhibit to the Registration Statement, (iii) the Subordinated Indenture (the
"Subordinated Indenture") to be entered into between Marine, the Subsidiary
Guarantors and Chase Bank of Texas, National Association, in the form included
as an exhibit to the Registration Statement, and (iv) such other certificates,
statutes and other instruments and documents as we considered appropriate for
purposes of the opinions hereafter expressed.



<PAGE>   2



Marine Drilling Companies, Inc.
Page 2
June 9, 1998

     In connection with this opinion, we have assumed that (i) the Registration
Statement, and any amendments thereto (including post-effective amendments),
will have become effective; (ii) a Prospectus Supplement will have been prepared
and filed with the Commission describing the Securities offered thereby; (iii)
all Securities will be issued and sold in compliance with applicable federal and
state securities laws and in the manner stated in the Registration Statement and
the applicable Prospectus Supplement; (iv) the Senior Indenture and the
Subordinated Indenture, together with any supplemental indenture relating to a
series of Debt Securities, will each be duly authorized, executed and delivered
by the parties thereto in substantially the form reviewed by us; (v) a
definitive purchase, underwriting or similar agreement with respect to any
Securities offered will have been duly authorized and validly executed and
delivered by Marine and the other parties thereto; and (vi) any Securities
issuable upon conversion, exchange or exercise of any Security being offered
will have been duly authorized, created and, if appropriate, reserved for
issuance upon such conversion, exchange or exercise.

     Based on the foregoing, we are of the opinion that:

     1. With respect to Debt Securities to be issued under the Senior Indenture,
when (i) the Senior Indenture has been duly qualified under the Trust Indenture
Act of 1939, as amended (the "TIA"); (ii) the Board of Directors of Marine or,
to the extent permitted by Article 2.36 of the Texas Business Corporation Act
(the "TBCA"), a duly constituted and acting committee thereof (such Board of
Directors or committee being referred to herein as the "Board") has taken all
necessary corporate action to approve the issuance and terms of such Debt
Securities, the terms of the offering thereof and related matters; (iii) the
terms of such Debt Securities and of their issuance and sale have been
established so as not to violate any applicable law or result in a default under
or breach of any agreement or instrument binding upon Marine and so as to comply
with any requirement or restriction imposed by any court or governmental body
having jurisdiction over Marine; and (iv) such Debt Securities have been duly
executed, authenticated, issued and delivered in accordance with the provisions
of the Senior Indenture and in accordance with the applicable definitive
purchase, underwriting or similar agreement approved by the Board upon payment
of the consideration provided for therein, such Debt Securities will be legally
issued and will constitute valid and binding obligations of Marine, enforceable
against Marine in accordance with their terms and will be entitled to the
benefits of the Senior Indenture.

     2. With respect to Debt Securities to be issued under the Subordinated
Indenture, when (i) the Subordinated Indenture has been duly qualified under the
TIA; (ii) the Board has taken all necessary corporate action to approve the
issuance and terms of such Debt Securities, the terms of the offering thereof
and related matters; (iii) the terms of such Debt Securities and of their
issuance and sale have been established so as not to violate any applicable law
or result in a default under or breach of any agreement or instrument binding
upon Marine and so as to comply with any requirement or restriction imposed by
any court or governmental body having jurisdiction over Marine; and (iv) such
Debt Securities have been duly executed, authenticated, issued and delivered in
accordance with the provisions of the Subordinated Indenture and in accordance
with the applicable definitive purchase, underwriting or similar agreement
approved by the Board upon


<PAGE>   3
Marine Drilling Companies, Inc.
Page 3
June 9, 1998

payment of the consideration provided for therein, such Debt Securities will be
legally issued and will constitute valid and binding obligations of Marine,
enforceable against Marine in accordance with their terms and will be entitled
to the benefits of the Subordinated Indenture.

     3. With respect to Guarantees issued by any Subsidiary Guarantor with
respect to any Debt Securities, when (i) the board of directors of each
Subsidiary Guarantor has taken all necessary corporate action to approve the
issuance and terms of such Guarantees, the terms of the offering thereof and
related matters; (ii) the terms of such Guarantees and of their issuance and
sale have been established so as not to violate any applicable law or result in
a default under or breach of any agreement or instrument binding upon such
Subsidiary Guarantor and so as to comply with any requirement or restriction
imposed by any court or governmental body having jurisdiction over such
Subsidiary Guarantor; and (iii) such Guarantees have been duly executed,
authenticated, issued and delivered in accordance with the provisions of the
applicable Indenture and in accordance with the applicable definitive purchase,
underwriting or similar agreement approved by the board of directors of such
Subsidiary Guarantor, such Guarantees will be legally issued and will constitute
valid and binding obligations of such Subsidiary Guarantor, enforceable against
such Subsidiary Guarantor in accordance with their terms.

     4. With respect to shares of any series of Preferred Stock, when (i) the
Board has taken all necessary corporate action to approve the issuance and terms
of the shares of such series, the terms of the offering thereof and related
matters, including the adoption of a resolution establishing and designating
such series and fixing and determining the preferences, limitations, and
relative rights thereof and the filing of a statement with respect to such
series with the Secretary of State of the State of Texas as required under
Article 2.13 of the TBCA; and (ii) certificates representing the shares of such
series of Preferred Stock have been duly executed, countersigned, registered and
delivered either (a) in accordance with the applicable definitive purchase,
underwriting or similar agreement approved by the Board upon payment of the
consideration therefor (not less than the par value of the Preferred Stock)
provided for therein, or (b) upon conversion, exchange or exercise of any other
Security in accordance with the terms of such Security or the instrument
governing such Security providing for such conversion, exchange or exercise as
approved by the Board, for the consideration approved by the Board (not less
than the par value of the Preferred Stock), the shares of such series of
Preferred Stock will be duly authorized, validly issued, fully paid and
non-assessable.

     5. With respect to shares of Common Stock, when (i) the Board has taken all
necessary corporate action to approve the issuance and terms of the offering
thereof and related matters; and (ii) certificates representing the shares of
Common Stock have been duly executed, countersigned, registered and delivered
either (a) in accordance with the applicable definitive purchase, underwriting
or similar agreement approved by the Board upon payment of the consideration
therefor (not less than the par value of the Common Stock) provided for therein,
or (b) upon conversion, exchange or exercise of any other Security in accordance
with the terms of such Security or the instrument governing such Security
providing for such conversion, exchange or exercise as approved by the Board,
for the consideration approved by the Board (not less than the par value of the


<PAGE>   4
Marine Drilling Companies, Inc.
Page 3
June 9, 1998



Common Stock and, in the case of shares of Common Stock issued upon the
conversion, exchange or exercise of another security, the consideration
specified in Article 2.15E of the TBCA), the shares of Common Stock will be duly
authorized, validly issued, fully paid and non-assessable.

     6. With respect to the Warrants, when (i) the Board has taken all necessary
corporate action to approve the creation of and the issuance and terms of the
Warrants, the terms of the offering thereof and related matters; (ii) the
warrant agreement or agreements relating to the Warrants have been duly
authorized and validly executed and delivered by Marine and the warrant agent
appointed by Marine; and (iii) the Warrants or certificates representing the
Warrants have been duly executed, countersigned, registered and delivered in
accordance with the appropriate warrant agreement or agreements and the
applicable definitive purchase, underwriting or similar agreement approved by
the Board upon payment of the consideration provided for therein, the Warrants
will be duly authorized and validly issued.

     The foregoing opinions are qualified to the extent that the enforceability
of any document, instrument or security may be limited by or subject to (i)
bankruptcy, insolvency, fraudulent transfer or conveyance, reorganization,
moratorium or other similar laws relating to or affecting creditors' rights
generally and by general equitable or public policy principles, and (ii) with
respect to any Debt Securities (and related Guarantees) denominated in a
currency other than United States dollars, the requirement that a claim (or a
foreign currency judgement in respect of such a claim) with respect to such
Securities be converted to United States dollars at a rate of exchange
prevailing on a date determined pursuant to applicable law or governmental
authority.

     We express no opinions concerning the validity or enforceability of any
provisions contained in the Senior Indenture or the Subordinated Indenture that
purport to waive or not give effect to rights to notices, defenses, subrogation
or other rights or benefits that cannot be effectively waived under applicable
law.

     The foregoing opinions are limited in all respects to the laws of the State
of Texas, the laws of the State of New York, the Delaware General Corporation
Law and federal laws.

     We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement. By giving such consent, we do not admit that we are
within the category of persons whose consent is required under Section 7 of the
Securities Act or the rules and regulations of the Commission issued thereunder.

                                          Very truly yours,


                                          VINSON & ELKINS L.L.P.

<PAGE>   1
 
                                                                    EXHIBIT 12.1
 
                        MARINE DRILLING COMPANIES, INC.
 
  RATIO OF EARNINGS TO FIXED CHARGES AND PREFERRED STOCK DIVIDENDS CALCULATION
                             (DOLLARS IN THOUSANDS)
<TABLE>
<CAPTION>
                                                     FOR THE YEARS ENDED DECEMBER 31,
                                            ---------------------------------------------------
DESCRIPTION                                      1993             1994               1995
- -----------                                 --------------    -------------    ----------------
<S>                                         <C>    <C>        <C>   <C>        <C>      <C>
Income (loss) before income taxes and
  extraordinary items.....................         $23,301          $ 9,123             $(6,102)
Add: Fixed charges:
    Interest expense......................  $580              $70              $  855
    Capitalized interest..................                                        126
    Amortized debt expense................                                         51
                                            ----              ---              ------
         Total fixed charges..............             580               70               1,032
Less: capitalized interest................               0                0                (126)
                                                   -------          -------             -------
    Subtotal earnings.....................         $23,881          $ 9,193             $(5,198)
                                                   =======          =======             =======
Divided by:
Fixed charges.............................         $   580          $    70             $ 1,032
                                                   -------          -------             -------
Ratio of earnings to fixed charges........         $ 41.17          $131.33             $ (5.03)
                                                   =======          =======             =======
Fixed charges.............................  $580              $70              $1,032
Preferred dividend requirements...........     0                0                   0
                                            ----              ---              ------
         Total fixed charges and preferred
           dividend requirements..........         $   580          $    70             $ 1,032
                                                   -------          -------             -------
Ratio if calculated with preferred stock
  dividend requirements...................         $ 41.17          $131.33             $ (5.03)
                                                   =======          =======             =======
If ratio is negative or zero:
Amount earnings did not cover fixed
  charges.................................               0                0               6,228
                                                   =======          =======             =======
 
<CAPTION>
                                             FOR THE YEARS ENDED DECEMBER 31,       THREE MONTHS
                                            ----------------------------------    ENDED MARCH 31,
DESCRIPTION                                       1996               1997               1998
- -----------                                 ----------------    --------------    ----------------
<S>                                         <C>      <C>        <C>    <C>        <C>     <C>
Income (loss) before income taxes and
  extraordinary items.....................           $32,255           $89,836            $26,199
Add: Fixed charges:
    Interest expense......................  $  895              $575              $ 86
    Capitalized interest..................      61                49                 0
    Amortized debt expense................      46               333                32
                                            ------              ----              ----
         Total fixed charges..............             1,002               957                118
Less: capitalized interest................               (61)              (49)                 0
                                                     -------           -------            -------
    Subtotal earnings.....................           $33,197           $90,744            $26,317
                                                     =======           =======            =======
Divided by:
Fixed charges.............................           $ 1,002           $   957            $   118
                                                     -------           -------            -------
Ratio of earnings to fixed charges........           $ 33.13           $ 94.82            $223.03
                                                     =======           =======            =======
Fixed charges.............................  $1,002              $957              $118
Preferred dividend requirements...........       0                 0                 0
                                            ------              ----              ----
         Total fixed charges and preferred
           dividend requirements..........           $ 1,002           $   957            $   118
                                                     -------           -------            -------
Ratio if calculated with preferred stock
  dividend requirements...................           $ 33.13           $ 94.82            $223.03
                                                     =======           =======            =======
If ratio is negative or zero:
Amount earnings did not cover fixed
  charges.................................                 0                 0                  0
                                                     =======           =======            =======
</TABLE>

<PAGE>   1
 
                                                                    EXHIBIT 15.1
 
The Board of Directors and Shareholders
Marine Drilling Companies, Inc.:
 
Ladies and Gentlemen:
 
     With respect to this registration statement, we acknowledge our awareness
of the use therein of our report dated April 28, 1998 related to our review of
interim financial information.
 
     Pursuant to Rule 436(c) under the Securities Act of 1933, such report is
not considered part of a registration statement prepared or certified by an
accountant or a report prepared or certified by an accountant within the meaning
of Sections 7 and 11 of the Act.
 
                                            KPMG Peat Marwick LLP
 
Houston, Texas
June 3, 1998

<PAGE>   1
 
                                                                    EXHIBIT 23.1
 
The Board of Directors and Shareholders
Marine Drilling Companies, Inc.:
 
     We consent to the use of our audit report dated January 20, 1998 on the
consolidated financial statements of Marine Drilling Companies, Inc. and
subsidiaries as of December 31, 1997 and 1996, and for each of the years in the
three-year period then ended incorporated herein by reference and to the
reference to our firm under the heading "Experts" in the prospectus.
 
                                            KPMG Peat Marwick LLP
 
Houston, Texas
June 3, 1998

<PAGE>   1
                                                                  EXHIBIT 24.1


                        MARINE DRILLING COMPANIES, INC.

                               POWER OF ATTORNEY


         WHEREAS, MARINE DRILLING COMPANIES, INC., a Texas corporation (the
"Company"), intends to file with the United States Securities and Exchange
Commission (the "Commission") under the United States Securities Act of 1933,
as amended (the "Securities Act"), a Registration Statement on Form S-3,
including a prospectus, with such amendment or amendments thereto, whether
pre-effective or post-effective, together with any registration statement
relating thereto of the type contemplated by Rule 462(b) of the Securities Act,
in each case as may be necessary or appropriate, together with any and all
exhibits and other documents having relation to said Registration Statement
(collectively, the "Registration Statement") in connection with the
registration of securities of the Company, which may include equity securities,
debt securities and/or other securities, to be offered by the Company pursuant
to Rule 415 of the Securities Act;

         NOW, THEREFORE, the undersigned, in his capacity as a director or
officer or both, as the case may be, of the Company does hereby appoint Jan
Rask and T. Scott O'Keefe, and each of them severally, as his true and lawful
attorneys with power to act with or without the other and with full power of
substitution and resubstitution, to execute in his name, place and stead in his
capacity as a director, officer or both, as the case may be, of the Company,
said Registration Statement, including without limitation any registration
statement of the type contemplated by Rule 462(b) of the Securities Act, and
all instruments necessary or incidental in connection therewith, with such
amendment or amendments thereto in each case as may be necessary or
appropriate, together with any and all exhibits and other documents relating
thereto.  Said attorneys shall have full power and authority to do and perform
in the name and on behalf of the undersigned in any and all capacities every
act whatsoever necessary or desirable to be done in the premises as fully and
to all intents and purposes as the undersigned might or could do in person, the
undersigned hereby ratifying and approving the acts of said attorneys.

         IN WITNESS WHEREOF, the undersigned has executed this instrument on
this 14th day of May, 1998



                                             /s/     Robert L. Barbanell   
                                             ----------------------------------
                                             Name:   Robert L. Barbanell
                                             Title:  Chairman of the Board
                                                     and Director 
<PAGE>   2
                        MARINE DRILLING COMPANIES, INC.

                               POWER OF ATTORNEY


         WHEREAS, MARINE DRILLING COMPANIES, INC., a Texas corporation (the
"Company"), intends to file with the United States Securities and Exchange
Commission (the "Commission") under the United States Securities Act of 1933,
as amended (the "Securities Act"), a Registration Statement on Form S-3,
including a prospectus, with such amendment or amendments thereto, whether
pre-effective or post-effective, together with any registration statement
relating thereto of the type contemplated by Rule 462(b) of the Securities Act,
in each case as may be necessary or appropriate, together with any and all
exhibits and other documents having relation to said Registration Statement
(collectively, the "Registration Statement") in connection with the
registration of securities of the Company, which may include equity securities,
debt securities and/or other securities, to be offered by the Company pursuant
to Rule 415 of the Securities Act;

         NOW, THEREFORE, the undersigned, in his capacity as a director or
officer or both, as the case may be, of the Company does hereby appoint Jan
Rask and T. Scott O'Keefe, and each of them severally, as his true and lawful
attorneys with power to act with or without the other and with full power of
substitution and resubstitution, to execute in his name, place and stead in his
capacity as a director, officer or both, as the case may be, of the Company,
said Registration Statement, including without limitation any registration
statement of the type contemplated by Rule 462(b) of the Securities Act, and
all instruments necessary or incidental in connection therewith, with such
amendment or amendments thereto in each case as may be necessary or
appropriate, together with any and all exhibits and other documents relating
thereto.  Said attorneys shall have full power and authority to do and perform
in the name and on behalf of the undersigned in any and all capacities every
act whatsoever necessary or desirable to be done in the premises as fully and
to all intents and purposes as the undersigned might or could do in person, the
undersigned hereby ratifying and approving the acts of said attorneys.

         IN WITNESS WHEREOF, the undersigned has executed this instrument on
this 14th day of May, 1998



                                             /s/     David A. B. Brown       
                                             ----------------------------------
                                             Name:   David A. B. Brown
                                             Title:  Director
<PAGE>   3
                        MARINE DRILLING COMPANIES, INC.

                               POWER OF ATTORNEY


         WHEREAS, MARINE DRILLING COMPANIES, INC., a Texas corporation (the
"Company"), intends to file with the United States Securities and Exchange
Commission (the "Commission") under the United States Securities Act of 1933,
as amended (the "Securities Act"), a Registration Statement on Form S-3,
including a prospectus, with such amendment or amendments thereto, whether
pre-effective or post-effective, together with any registration statement
relating thereto of the type contemplated by Rule 462(b) of the Securities Act,
in each case as may be necessary or appropriate, together with any and all
exhibits and other documents having relation to said Registration Statement
(collectively, the "Registration Statement") in connection with the
registration of securities of the Company, which may include equity securities,
debt securities and/or other securities, to be offered by the Company pursuant
to Rule 415 of the Securities Act;

         NOW, THEREFORE, the undersigned, in his capacity as a director or
officer or both, as the case may be, of the Company does hereby appoint Jan
Rask and T. Scott O'Keefe, and each of them severally, as his true and lawful
attorneys with power to act with or without the other and with full power of
substitution and resubstitution, to execute in his name, place and stead in his
capacity as a director, officer or both, as the case may be, of the Company,
said Registration Statement, including without limitation any registration
statement of the type contemplated by Rule 462(b) of the Securities Act, and
all instruments necessary or incidental in connection therewith, with such
amendment or amendments thereto in each case as may be necessary or
appropriate, together with any and all exhibits and other documents relating
thereto.  Said attorneys shall have full power and authority to do and perform
in the name and on behalf of the undersigned in any and all capacities every
act whatsoever necessary or desirable to be done in the premises as fully and
to all intents and purposes as the undersigned might or could do in person, the
undersigned hereby ratifying and approving the acts of said attorneys.

         IN WITNESS WHEREOF, the undersigned has executed this instrument on
this 29th day of May, 1998



                                             /s/     Howard I. Bull           
                                             ----------------------------------
                                             Name:   Howard I. Bull
                                             Title:  Director
<PAGE>   4
                        MARINE DRILLING COMPANIES, INC.

                               POWER OF ATTORNEY


         WHEREAS, MARINE DRILLING COMPANIES, INC., a Texas corporation (the
"Company"), intends to file with the United States Securities and Exchange
Commission (the "Commission") under the United States Securities Act of 1933,
as amended (the "Securities Act"), a Registration Statement on Form S-3,
including a prospectus, with such amendment or amendments thereto, whether
pre-effective or post-effective, together with any registration statement
relating thereto of the type contemplated by Rule 462(b) of the Securities Act,
in each case as may be necessary or appropriate, together with any and all
exhibits and other documents having relation to said Registration Statement
(collectively, the "Registration Statement") in connection with the
registration of securities of the Company, which may include equity securities,
debt securities and/or other securities, to be offered by the Company pursuant
to Rule 415 of the Securities Act;

         NOW, THEREFORE, the undersigned, in his capacity as a director or
officer or both, as the case may be, of the Company does hereby appoint Jan
Rask and T. Scott O'Keefe, and each of them severally, as his true and lawful
attorneys with power to act with or without the other and with full power of
substitution and resubstitution, to execute in his name, place and stead in his
capacity as a director, officer or both, as the case may be, of the Company,
said Registration Statement, including without limitation any registration
statement of the type contemplated by Rule 462(b) of the Securities Act, and
all instruments necessary or incidental in connection therewith, with such
amendment or amendments thereto in each case as may be necessary or
appropriate, together with any and all exhibits and other documents relating
thereto.  Said attorneys shall have full power and authority to do and perform
in the name and on behalf of the undersigned in any and all capacities every
act whatsoever necessary or desirable to be done in the premises as fully and
to all intents and purposes as the undersigned might or could do in person, the
undersigned hereby ratifying and approving the acts of said attorneys.

         IN WITNESS WHEREOF, the undersigned has executed this instrument on
this 26th day of May, 1998


                                             /s/     J. C. Burton
                                             ----------------------------------
                                             Name:   J. C. Burton
                                             Title:  Director
<PAGE>   5
                        MARINE DRILLING COMPANIES, INC.

                               POWER OF ATTORNEY


         WHEREAS, MARINE DRILLING COMPANIES, INC., a Texas corporation (the
"Company"), intends to file with the United States Securities and Exchange
Commission (the "Commission") under the United States Securities Act of 1933,
as amended (the "Securities Act"), a Registration Statement on Form S-3,
including a prospectus, with such amendment or amendments thereto, whether
pre-effective or post-effective, together with any registration statement
relating thereto of the type contemplated by Rule 462(b) of the Securities Act,
in each case as may be necessary or appropriate, together with any and all
exhibits and other documents having relation to said Registration Statement
(collectively, the "Registration Statement") in connection with the
registration of securities of the Company, which may include equity securities,
debt securities and/or other securities, to be offered by the Company pursuant
to Rule 415 of the Securities Act;

         NOW, THEREFORE, the undersigned, in his capacity as a director or
officer or both, as the case may be, of the Company does hereby appoint Jan
Rask and T. Scott O'Keefe, and each of them severally, as his true and lawful
attorneys with power to act with or without the other and with full power of
substitution and resubstitution, to execute in his name, place and stead in his
capacity as a director, officer or both, as the case may be, of the Company,
said Registration Statement, including without limitation any registration
statement of the type contemplated by Rule 462(b) of the Securities Act, and
all instruments necessary or incidental in connection therewith, with such
amendment or amendments thereto in each case as may be necessary or
appropriate, together with any and all exhibits and other documents relating
thereto.  Said attorneys shall have full power and authority to do and perform
in the name and on behalf of the undersigned in any and all capacities every
act whatsoever necessary or desirable to be done in the premises as fully and
to all intents and purposes as the undersigned might or could do in person, the
undersigned hereby ratifying and approving the acts of said attorneys.

         IN WITNESS WHEREOF, the undersigned has executed this instrument on
this 15th day of May, 1998



                                                                   
                                             /s/     David B. Robson          
                                             ----------------------------------
                                             Name:   David B. Robson
                                             Title:  Director
<PAGE>   6
                        MARINE DRILLING COMPANIES, INC.

                               POWER OF ATTORNEY


         WHEREAS, MARINE DRILLING COMPANIES, INC., a Texas corporation (the
"Company"), intends to file with the United States Securities and Exchange
Commission (the "Commission") under the United States Securities Act of 1933,
as amended (the "Securities Act"), a Registration Statement on Form S-3,
including a prospectus, with such amendment or amendments thereto, whether
pre-effective or post-effective, together with any registration statement
relating thereto of the type contemplated by Rule 462(b) of the Securities Act,
in each case as may be necessary or appropriate, together with any and all
exhibits and other documents having relation to said Registration Statement
(collectively, the "Registration Statement") in connection with the
registration of securities of the Company, which may include equity securities,
debt securities and/or other securities, to be offered by the Company pursuant
to Rule 415 of the Securities Act;

         NOW, THEREFORE, the undersigned, in his capacity as a director or
officer or both, as the case may be, of the Company does hereby appoint Jan
Rask and T. Scott O'Keefe, and each of them severally, as his true and lawful
attorneys with power to act with or without the other and with full power of
substitution and resubstitution, to execute in his name, place and stead in his
capacity as a director, officer or both, as the case may be, of the Company,
said Registration Statement, including without limitation any registration
statement of the type contemplated by Rule 462(b) of the Securities Act, and
all instruments necessary or incidental in connection therewith, with such
amendment or amendments thereto in each case as may be necessary or
appropriate, together with any and all exhibits and other documents relating
thereto.  Said attorneys shall have full power and authority to do and perform
in the name and on behalf of the undersigned in any and all capacities every
act whatsoever necessary or desirable to be done in the premises as fully and
to all intents and purposes as the undersigned might or could do in person, the
undersigned hereby ratifying and approving the acts of said attorneys.

         IN WITNESS WHEREOF, the undersigned has executed this instrument on
this 14th day of May, 1998



                                             /s/     Robert C. Thomas        
                                             ----------------------------------
                                             Name:   Robert C. Thomas
                                             Title:  Director

<PAGE>   1
                                                                    EXHIBIT 25.1

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                            -------------------------

                                    FORM T-1

                       STATEMENT OF ELIGIBILITY UNDER THE
                           TRUST INDENTURE ACT OF 1939
                  OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE

                CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY
                   OF A TRUSTEE PURSUANT TO SECTION 305(b)(2)

                            -------------------------

                    CHASE BANK OF TEXAS, NATIONAL ASSOCIATION
               (Exact name of trustee as specified in its charter)

                                   74-0800980
                     (I.R.S. Employer Identification Number)

    712 MAIN STREET, HOUSTON, TEXAS                                  77002
(Address of principal executive offices)                           (Zip code)

                    LEE BOOCKER, 712 MAIN STREET, 26TH FLOOR
                       HOUSTON, TEXAS 77002 (713) 216-2448
            (Name, address and telephone number of agent for service)

                         MARINE DRILLING COMPANIES, INC.
               (Exact name of obligor as specified in its charter)
                     SEE TABLE OF ADDITIONAL OBLIGORS BELOW

                  TEXAS                                       74-2558926
     (State or other jurisdiction of                       (I.R.S. Employer
      incorporation or organization)                    Identification Number)

ONE SUGAR CREEK CENTER BOULEVARD, SUITE 600
           SUGAR LAND, TEXAS                                  77478-3556
 (Address of principal executive offices)                     (Zip code)

                             SENIOR DEBT SECURITIES
                         (Title of indenture securities)

================================================================================

<PAGE>   2

                          TABLE OF ADDITIONAL OBLIGORS

<TABLE>
<CAPTION>
                                                                                      ADDRESS, INCLUDING ZIP
                                                                                       CODE, AND TELEPHONE
                                                                                      NUMBER, INCLUDING AREA
                                                STATE OR OTHER                        CODE, OF REGISTRANT'S
                                               JURISDICTION OF      IRS EMPLOYER       PRINCIPAL EXECUTIVE
               NAME                             INCORPORATION          ID NO.                 OFFICES
               ----                             -------------          ------                 -------
<S>                                            <C>                  <C>               <C>
Marine Drilling Management Company                Delaware           74-2570231                  *

Marine Drilling International, Inc.               Delaware           76-0395411                  *

Marine 300 Series, Inc.                           Delaware           74-2562642                  *
</TABLE>

  One Sugar Creek Center Boulevard, Suite 600, Sugar Land, Texas 77478-3556,
                            Telephone (281) 243-3000







<PAGE>   3

ITEM 1.           GENERAL INFORMATION.

         FURNISH THE FOLLOWING INFORMATION AS TO THE TRUSTEE:

         (a)      NAME AND ADDRESS OF EACH EXAMINING OR SUPERVISING
                  AUTHORITY TO WHICH IT IS SUBJECT.

                  Comptroller of the Currency, Washington, D.C. Federal Deposit
                  Insurance Corporation, Washington, D.C. Board of Governors of
                  the Federal Reserve System, Washington, D.C.

         (b)      WHETHER IT IS AUTHORIZED TO EXERCISE CORPORATE TRUST POWERS.

                  The trustee is authorized to exercise corporate trust powers.

ITEM 2.           AFFILIATIONS WITH THE OBLIGOR.

                  IF THE OBLIGOR IS AN AFFILIATE OF THE TRUSTEE, DESCRIBE EACH
                  SUCH AFFILIATION.

                  The obligor is not an affiliate of the trustee. (See Note on
                  Page 7.)

ITEM 3.           VOTING SECURITIES OF THE TRUSTEE.

                  FURNISH THE FOLLOWING INFORMATION AS TO EACH CLASS OF VOTING
                  SECURITIES OF THE TRUSTEE.

<TABLE>
<CAPTION>
                               COL. A                          COL. B
                           TITLE OF CLASS                AMOUNT OUTSTANDING
                           --------------                ------------------
                           <S>                           <C>

                  Not applicable by virtue of Form T-1 General Instruction B and
                  response to Item 13.
</TABLE>


ITEM 4.           TRUSTEESHIPS UNDER OTHER INDENTURES.

                  IF THE TRUSTEE IS A TRUSTEE UNDER ANOTHER INDENTURE UNDER
                  WHICH ANY OTHER SECURITIES, OR CERTIFICATES OF INTEREST OR
                  PARTICIPATION IN ANY OTHER SECURITIES, OF THE OBLIGOR ARE
                  OUTSTANDING, FURNISH THE FOLLOWING INFORMATION:

                  (a) TITLE OF THE SECURITIES OUTSTANDING UNDER EACH SUCH OTHER
                  INDENTURE.

                  Not applicable by virtue of Form T-1 General Instruction B and
                  response to Item 13.



                                       1
<PAGE>   4

ITEM 4. (CONTINUED)

                  (b) A BRIEF STATEMENT OF THE FACTS RELIED UPON AS A BASIS FOR
                  THE CLAIM THAT NO CONFLICTING INTEREST WITHIN THE MEANING OF
                  SECTION 310(b)(1) OF THE ACT ARISES AS A RESULT OF THE
                  TRUSTEESHIP UNDER ANY SUCH OTHER INDENTURE, INCLUDING A
                  STATEMENT AS TO HOW THE INDENTURE SECURITIES WILL RANK AS
                  COMPARED WITH THE SECURITIES ISSUED UNDER SUCH OTHER
                  INDENTURE.

                  Not applicable by virtue of Form T-1 General Instruction B and
                  response to Item 13.

ITEM 5.           INTERLOCKING DIRECTORATES AND SIMILAR RELATIONSHIPS WITH
                  OBLIGOR OR UNDERWRITERS.

                  IF THE TRUSTEE OR ANY OF THE DIRECTORS OR EXECUTIVE OFFICER OF
THE TRUSTEE IS A DIRECTOR, OFFICER, PARTNER, EMPLOYEE, APPOINTEE, OR
REPRESENTATIVE OF THE OBLIGOR OR OF ANY UNDERWRITER FOR THE OBLIGOR, IDENTIFY
EACH SUCH PERSON HAVING ANY SUCH CONNECTION AND STATE THE NATURE OF EACH SUCH
CONNECTION.

                  Not applicable by virtue of Form T-1 General Instruction B and
                  response to Item 13.

ITEM 6.           VOTING SECURITIES OF THE TRUSTEE OWNED BY THE OBLIGOR OR ITS
                  OFFICIALS.

                  FURNISH THE FOLLOWING INFORMATION AS TO THE VOTING SECURITIES
OF THE TRUSTEE OWNED BENEFICIALLY BY THE OBLIGOR AND EACH DIRECTOR, PARTNER AND
EXECUTIVE OFFICER OF THE OBLIGOR.

<TABLE>
<CAPTION>
    COL. A               COL. B                     COL. C                      COL. D
                                                                             PERCENTAGE OF
                                                                          VOTING SECURITIES
                                                                            REPRESENTED BY
                                                 AMOUNT OWNED               AMOUNT GIVEN IN
NAME OF OWNER        TITLE OF CLASS              BENEFICIALLY                   COL. C
- -------------        --------------              ------------                   ------
<S>                  <C>                         <C>                      <C>

Not applicable by virtue of Form T-1 General Instruction B and response to Item 13.
</TABLE>





                                       2
<PAGE>   5

ITEM 7.           VOTING SECURITIES OF THE TRUSTEE OWNED BY UNDERWRITERS OR 
                  THEIR OFFICIALS.

                  FURNISH THE FOLLOWING INFORMATION AS TO THE VOTING SECURITIES
OF THE TRUSTEE OWNED BENEFICIALLY BY EACH UNDERWRITER FOR THE OBLIGOR AND EACH
DIRECTOR, PARTNER AND EXECUTIVE OFFICER OF EACH SUCH UNDERWRITER.

<TABLE>
<CAPTION>
    COL. A               COL. B                     COL. C                      COL. D
                                                                             PERCENTAGE OF
                                                                          VOTING SECURITIES
                                                                            REPRESENTED BY
                                                 AMOUNT OWNED               AMOUNT GIVEN IN
NAME OF OWNER        TITLE OF CLASS              BENEFICIALLY                   COL. C
- -------------        --------------              ------------                   ------
<S>                  <C>                         <C>                      <C>

Not applicable by virtue of Form T-1 General Instruction B and response to Item 13.
</TABLE>

ITEM 8.           SECURITIES OF THE OBLIGOR OWNED OR HELD BY THE TRUSTEE.

                  FURNISH THE FOLLOWING INFORMATION AS TO THE SECURITIES OF THE
OBLIGOR OWNED BENEFICIALLY OR HELD AS COLLATERAL SECURITY FOR OBLIGATIONS IN
DEFAULT BY THE TRUSTEE.

<TABLE>
<CAPTION>
   COL. A                     COL. B                 COL. C                  COL. D
                                                 AMOUNT OWNED
                           WHETHER THE          BENEFICIALLY OR            PERCENT OF
                           SECURITIES          HELD AS COLLATERAL             CLASS
                           ARE VOTING             SECURITY FOR            REPRESENTED BY
                          OR NONVOTING           OBLIGATIONS IN            AMOUNT GIVEN
TITLE OF CLASS             SECURITIES               DEFAULT                 IN COL. C
- --------------             ----------               -------                 ---------
<S>                       <C>                  <C>                        <C>



Not applicable by virtue of Form T-1 General Instruction B and response to Item 13.
</TABLE>






                                       3
<PAGE>   6

ITEM 9.           SECURITIES OF UNDERWRITERS OWNED OR HELD BY THE TRUSTEE.

                  IF THE TRUSTEE OWNS BENEFICIALLY OR HOLDS AS COLLATERAL
SECURITY FOR OBLIGATIONS IN DEFAULT ANY SECURITIES OF AN UNDERWRITER FOR THE
OBLIGOR, FURNISH THE FOLLOWING INFORMATION AS TO EACH CLASS OF SECURITIES OF
SUCH UNDERWRITER ANY OF WHICH ARE SO OWNED OR HELD BY THE TRUSTEE.

<TABLE>
<CAPTION>
   COL. A                     COL. B                 COL. C                  COL. D
                                                 AMOUNT OWNED
                                                BENEFICIALLY OR            PERCENT OF
                                               HELD AS COLLATERAL             CLASS
NAME OF ISSUER                                   SECURITY FOR            REPRESENTED BY
     AND                      AMOUNT             OBLIGATIONS IN            AMOUNT GIVEN
TITLE OF CLASS             OUTSTANDING              DEFAULT                 IN COL. C
- --------------             ----------               -------                 ---------
<S>                       <C>                  <C>                        <C>



Not applicable by virtue of Form T-1 General Instruction B and response to Item 13.
</TABLE>

ITEM 10.          OWNERSHIP OR HOLDINGS BY THE TRUSTEE OF VOTING SECURITIES
                  OF CERTAIN AFFILIATES OR SECURITY HOLDERS OF THE OBLIGOR.

                  IF THE TRUSTEE OWNS BENEFICIALLY OR HOLDS AS COLLATERAL
SECURITY FOR OBLIGATIONS IN DEFAULT VOTING SECURITIES OF A PERSON WHO, TO THE
KNOWLEDGE OF THE TRUSTEE (1) OWNS 10% OR MORE OF THE VOTING SECURITIES OF THE
OBLIGOR OR (2) IS AN AFFILIATE, OTHER THAN A SUBSIDIARY, OF THE OBLIGOR, FURNISH
THE FOLLOWING INFORMATION AS TO THE VOTING SECURITIES OF SUCH PERSON.

<TABLE>
<CAPTION>
   COL. A                     COL. B                 COL. C                  COL. D
                                                 AMOUNT OWNED
                                                BENEFICIALLY OR            PERCENT OF
                                               HELD AS COLLATERAL             CLASS
NAME OF ISSUER                                   SECURITY FOR            REPRESENTED BY
     AND                      AMOUNT             OBLIGATIONS IN            AMOUNT GIVEN
TITLE OF CLASS             OUTSTANDING              DEFAULT                 IN COL. C
- --------------             ----------               -------                 ---------
<S>                       <C>                  <C>                        <C>



Not applicable by virtue of Form T-1 General Instruction B and response to Item 13.
</TABLE>





                                       4
<PAGE>   7

ITEM 11.          OWNERSHIP OR HOLDINGS BY THE TRUSTEE OF ANY SECURITIES OF
                  A PERSON OWNING 50% OR MORE OF THE VOTING SECURITIES OF THE
                  OBLIGOR.

                  IF THE TRUSTEE OWNS BENEFICIALLY OR HOLDS AS COLLATERAL
SECURITY FOR OBLIGATIONS IN DEFAULT ANY SECURITIES OF A PERSON WHO, TO THE
KNOWLEDGE OF THE TRUSTEE, OWNS 50% OR MORE OF THE VOTING SECURITIES OF THE
OBLIGOR, FURNISH THE FOLLOWING INFORMATION AS TO EACH CLASS OF SECURITIES OR
SUCH PERSON ANY OF WHICH ARE SO OWNED OR HELD BY THE TRUSTEE.

<TABLE>
<CAPTION>
   COL. A                     COL. B                 COL. C                  COL. D
                                                 AMOUNT OWNED
                                                BENEFICIALLY OR            PERCENT OF
                                               HELD AS COLLATERAL             CLASS
NAME OF ISSUER                                   SECURITY FOR            REPRESENTED BY
     AND                      AMOUNT             OBLIGATIONS IN            AMOUNT GIVEN
TITLE OF CLASS             OUTSTANDING              DEFAULT                 IN COL. C
- --------------             ----------               -------                 ---------
<S>                       <C>                  <C>                        <C>



Not applicable by virtue of Form T-1 General Instruction B and response to Item 13.
</TABLE>

ITEM 12.          INDEBTEDNESS OF THE OBLIGOR TO THE TRUSTEE.

                  EXCEPT AS NOTED IN THE INSTRUCTIONS, IF THE OBLIGOR IS
INDEBTED TO THE TRUSTEE, FURNISH THE FOLLOWING INFORMATION:

<TABLE>
<CAPTION>
  COL. A                         COL. B                        COL. C

 NATURE OF                       AMOUNT
INDEBTEDNESS                   OUTSTANDING                    DATE DUE
- ------------                   -----------                    --------
<S>                            <C>                            <C>


Not applicable by virtue of Form T-1 General Instruction B and response to Item 13.
</TABLE>

ITEM 13.          DEFAULTS BY THE OBLIGOR.

         (a)      STATE WHETHER THERE IS OR HAS BEEN A DEFAULT WITH RESPECT TO
THE SECURITIES UNDER THIS INDENTURE. EXPLAIN THE NATURE OF ANY SUCH DEFAULT.

         There is not, nor has there been, a default with respect to the
securities under this indenture. (See Note on Page 7.)



                                       5
<PAGE>   8

ITEM 13. (CONTINUED)

         (b) IF THE TRUSTEE IS A TRUSTEE UNDER ANOTHER INDENTURE UNDER WHICH ANY
SECURITIES, OR CERTIFICATES OF INTEREST OR PARTICIPATION IN ANY OTHER
SECURITIES, OF THE OBLIGOR ARE OUTSTANDING, OR IS TRUSTEE FOR MORE THAN ONE
OUTSTANDING SERIES OF SECURITIES UNDER THE INDENTURE, STATE WHETHER THERE HAS
BEEN A DEFAULT UNDER ANY SUCH INDENTURE OR SERIES, IDENTIFY THE INDENTURE OR
SERIES AFFECTED, AND EXPLAIN THE NATURE OF ANY SUCH DEFAULT.

         There has not been a default under any such indenture or series. (See
Note on Page 7.)

ITEM 14.          AFFILIATIONS WITH THE UNDERWRITERS.

                  IF ANY UNDERWRITER IS AN AFFILIATE OF THE TRUSTEE, DESCRIBE
EACH SUCH AFFILIATION.

       Not applicable by virtue of Form T-1 General Instruction B and response
to Item 13.

ITEM 15.          FOREIGN TRUSTEE.

                  IDENTIFY THE ORDER OR RULE PURSUANT TO WHICH THE FOREIGN
TRUSTEE IS AUTHORIZED TO ACT AS SOLE TRUSTEE UNDER INDENTURES QUALIFIED OR TO BE
QUALIFIED UNDER THE ACT.

                  Not applicable.

ITEM 16.          LIST OF EXHIBITS.

                  LIST BELOW ALL EXHIBITS FILED AS PART OF THIS STATEMENT OF
ELIGIBILITY.

                  o 1. A copy of the articles of association of the trustee now
                  in effect.

                  # 2. A copy of the certificate of authority of the trustee to
                  commence business.

                  * 3. A copy of the certificate of authorization of the trustee
                  to exercise corporate trust powers issued by the Board of
                  Governors of the Federal Reserve System under date of January
                  21, 1948.

                  + 4. A copy of the existing bylaws of the trustee.

                    5. Not applicable.




                                       6
<PAGE>   9

                    6. The consent of the United States institutional trustees
                  required by Section 321(b) of the Act.

                  []7. A copy of the latest report of condition of the trustee
                  published pursuant to law or the requirements of its
                  supervising or examining authority.

                    8. Not applicable.

                    9. Not applicable.

                      NOTE REGARDING INCORPORATED EXHIBITS

         Effective January 20, 1998, the name of the Trustee was changed from
Texas Commerce Bank National Association to Chase Bank of Texas, National
Association. The exhibits incorporated herein by reference, except for Exhibit
7, were filed under the former name of the Trustee.

         o Incorporated by reference to exhibit bearing the same designation and
previously filed with the Securities and Exchange Commission as exhibits to the
Form S-3 File No. 33-56195.

         # Incorporated by reference to exhibit bearing the same designation and
previously filed with the Securities and Exchange Commission as exhibits to the
Form S-3 File No. 33-42814.

         * Incorporated by reference to exhibit bearing the same designation and
previously filed with the Securities and Exchange Commission as exhibits to the
Form S-11 File No. 33-25132.

         + Incorporated by reference to exhibit bearing the same designation and
previously filed with the Securities and Exchange Commission as exhibits to the
Form S-3 File No. 33-65055.

         [] Incorporated by reference to exhibit bearing the same designation
and previously filed with the Securities and Exchange Commission as exhibits to
the Form S-3 File No. 333-52197.

                                      NOTE

            Inasmuch as this Form T-1 is filed prior to the ascertainment by the
trustee of all facts on which to base responsive answers to Items 2 and 13, the
answers to said Items are based on incomplete information. Such Items may,
however, be considered as correct unless amended by an amendment to this Form
T-1.



                                       7
<PAGE>   10

                                    SIGNATURE

         PURSUANT TO THE REQUIREMENTS OF THE TRUST INDENTURE ACT OF 1939 THE
TRUSTEE, CHASE BANK OF TEXAS, NATIONAL ASSOCIATION, FORMERLY KNOWN AS TEXAS
COMMERCE BANK NATIONAL ASSOCIATION, A NATIONAL BANKING ASSOCIATION ORGANIZED AND
EXISTING UNDER THE LAWS OF THE UNITED STATES OF AMERICA, HAS DULY CAUSED THIS
STATEMENT OF ELIGIBILITY TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED,
THEREUNTO AUTHORIZED, ALL IN THE CITY OF HOUSTON, AND STATE OF TEXAS, ON THE 9TH
DAY OF JUNE, 1998.

                                          CHASE BANK OF TEXAS, NATIONAL
                                             ASSOCIATION, AS TRUSTEE


                                          By: /s/ MAURI J. COWEN
                                             -------------------------------
                                                  Mauri J. Cowen
                                             Vice President and Trust Officer





                                       8
<PAGE>   11

                                                                       EXHIBIT 6



Securities and Exchange Commission
Washington, D.C. 20549

Gentlemen:

         The undersigned is trustee under an Indenture between Marine Drilling
Companies, Inc., a Texas corporation (the "Company"), together with certain
subsidiary guarantors, and Chase Bank of Texas, National Association, as
Trustee, entered into in connection with the issuance of the Company's Senior
Debt Securities.

         In accordance with Section 321(b) of the Trust Indenture Act of 1939,
the undersigned hereby consents that reports of examinations of the undersigned,
made by Federal or State authorities authorized to make such examinations, may
be furnished by such authorities to the Securities and Exchange Commission upon
its request therefor.

                                          Very truly yours,

                                          CHASE BANK OF TEXAS, NATIONAL
                                             ASSOCIATION, AS TRUSTEE


                                          By: /s/ MAURI J. COWEN
                                             -------------------------------
                                                  Mauri J. Cowen
                                             Vice President and Trust Officer

<PAGE>   1
                                                                    EXHIBIT 25.2

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                            -------------------------

                                    FORM T-1

                       STATEMENT OF ELIGIBILITY UNDER THE
                           TRUST INDENTURE ACT OF 1939
                  OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE

                CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY
                   OF A TRUSTEE PURSUANT TO SECTION 305(b)(2)

                            -------------------------

                    CHASE BANK OF TEXAS, NATIONAL ASSOCIATION
               (Exact name of trustee as specified in its charter)

                                   74-0800980
                     (I.R.S. Employer Identification Number)

    712 MAIN STREET, HOUSTON, TEXAS                                   77002
(Address of principal executive offices)                            (Zip code)

                    LEE BOOCKER, 712 MAIN STREET, 26TH FLOOR
                       HOUSTON, TEXAS 77002 (713) 216-2448
            (Name, address and telephone number of agent for service)

                         MARINE DRILLING COMPANIES, INC.
               (Exact name of obligor as specified in its charter)
                     SEE TABLE OF ADDITIONAL OBLIGORS BELOW

                 TEXAS                                         74-2558926
    (State or other jurisdiction of                        (I.R.S. Employer
     incorporation or organization)                     Identification Number)

ONE SUGAR CREEK CENTER BOULEVARD, SUITE 600
            SUGAR LAND, TEXAS                                  77478-3556
 (Address of principal executive offices)                      (Zip code)

                           SUBORDINATE DEBT SECURITIES
                         (Title of indenture securities)

================================================================================
<PAGE>   2

                          TABLE OF ADDITIONAL OBLIGORS

<TABLE>
<CAPTION>
                                                                                   ADDRESS, INCLUDING ZIP
                                                                                    CODE, AND TELEPHONE
                                                                                  NUMBER, INCLUDING AREA
                                           STATE OR OTHER                         CODE, OF REGISTRANT'S
                                          JURISDICTION OF      IRS EMPLOYER       PRINCIPAL EXECUTIVE
            NAME                           INCORPORATION          ID NO.                 OFFICES
            ----                           -------------          ------                 -------
<S>                                       <C>                  <C>                <C>
Marine Drilling Management Company            Delaware           74-2570231                  *

Marine Drilling International, Inc.           Delaware           76-0395411                  *

Marine 300 Series, Inc.                       Delaware           74-2562642                  *
</TABLE>

   One Sugar Creek Center Boulevard, Suite 600, Sugar Land, Texas 77478-3556,
                            Telephone (281) 243-3000




<PAGE>   3

ITEM 1.           GENERAL INFORMATION.

         FURNISH THE FOLLOWING INFORMATION AS TO THE TRUSTEE:

         (a)      NAME AND ADDRESS OF EACH EXAMINING OR SUPERVISING
                  AUTHORITY TO WHICH IT IS SUBJECT.

                  Comptroller of the Currency, Washington, D.C. Federal Deposit
                  Insurance Corporation, Washington, D.C. Board of Governors of
                  the Federal Reserve System, Washington, D.C.

         (b)      WHETHER IT IS AUTHORIZED TO EXERCISE CORPORATE TRUST POWERS.

                  The trustee is authorized to exercise corporate trust powers.

ITEM 2.           AFFILIATIONS WITH THE OBLIGOR.

                  IF THE OBLIGOR IS AN AFFILIATE OF THE TRUSTEE, DESCRIBE EACH
                  SUCH AFFILIATION.

                  The obligor is not an affiliate of the trustee. (See Note on
                  Page 7.)

ITEM 3.           VOTING SECURITIES OF THE TRUSTEE.

                  FURNISH THE FOLLOWING INFORMATION AS TO EACH CLASS OF VOTING
                  SECURITIES OF THE TRUSTEE.

<TABLE>
<CAPTION>
                          COL. A                          COL. B
                      TITLE OF CLASS                AMOUNT OUTSTANDING
                      --------------                ------------------
                      <S>                           <C>


                  Not applicable by virtue of Form T-1 General Instruction B and
                  response to Item 13.
</TABLE>

ITEM 4.           TRUSTEESHIPS UNDER OTHER INDENTURES.

                  IF THE TRUSTEE IS A TRUSTEE UNDER ANOTHER INDENTURE UNDER
WHICH ANY OTHER SECURITIES, OR CERTIFICATES OF INTEREST OR PARTICIPATION IN ANY
OTHER SECURITIES, OF THE OBLIGOR ARE OUTSTANDING, FURNISH THE FOLLOWING
INFORMATION:

                  (a) TITLE OF THE SECURITIES OUTSTANDING UNDER EACH SUCH OTHER
                  INDENTURE.

                  Not applicable by virtue of Form T-1 General Instruction B and
                  response to Item 13.



                                       1
<PAGE>   4

ITEM 4. (CONTINUED)

                  (b) A BRIEF STATEMENT OF THE FACTS RELIED UPON AS A BASIS FOR
                  THE CLAIM THAT NO CONFLICTING INTEREST WITHIN THE MEANING OF
                  SECTION 310(B)(1) OF THE ACT ARISES AS A RESULT OF THE
                  TRUSTEESHIP UNDER ANY SUCH OTHER INDENTURE, INCLUDING A
                  STATEMENT AS TO HOW THE INDENTURE SECURITIES WILL RANK AS
                  COMPARED WITH THE SECURITIES ISSUED UNDER SUCH OTHER
                  INDENTURE.

                  Not applicable by virtue of Form T-1 General Instruction B and
                  response to Item 13.

ITEM 5.           INTERLOCKING DIRECTORATES AND SIMILAR RELATIONSHIPS WITH
                  OBLIGOR OR UNDERWRITERS.

                  IF THE TRUSTEE OR ANY OF THE DIRECTORS OR EXECUTIVE OFFICER OF
THE TRUSTEE IS A DIRECTOR, OFFICER, PARTNER, EMPLOYEE, APPOINTEE, OR
REPRESENTATIVE OF THE OBLIGOR OR OF ANY UNDERWRITER FOR THE OBLIGOR, IDENTIFY
EACH SUCH PERSON HAVING ANY SUCH CONNECTION AND STATE THE NATURE OF EACH SUCH
CONNECTION.

                  Not applicable by virtue of Form T-1 General Instruction B and
                  response to Item 13.

ITEM 6.           VOTING SECURITIES OF THE TRUSTEE OWNED BY THE OBLIGOR OR ITS
                  OFFICIALS.

                  FURNISH THE FOLLOWING INFORMATION AS TO THE VOTING SECURITIES
OF THE TRUSTEE OWNED BENEFICIALLY BY THE OBLIGOR AND EACH DIRECTOR, PARTNER AND
EXECUTIVE OFFICER OF THE OBLIGOR.

<TABLE>
<CAPTION>
   COL. A                 COL. B                 COL. C                    COL. D
                                                                        PERCENTAGE OF
                                                                       VOTING SECURITIES
                                                                        REPRESENTED BY
                                              AMOUNT OWNED             AMOUNT GIVEN IN
NAME OF OWNER         TITLE OF CLASS          BENEFICIALLY                 COL. C
- -------------         --------------          ------------                 ------
<S>                   <C>                     <C>                      <C>


Not applicable by virtue of Form T-1 General Instruction B and response to Item 13.
</TABLE>






                                       2
<PAGE>   5

ITEM 7.           VOTING SECURITIES OF THE TRUSTEE OWNED BY UNDERWRITERS OR 
                  THEIR OFFICIALS.

                  FURNISH THE FOLLOWING INFORMATION AS TO THE VOTING SECURITIES
OF THE TRUSTEE OWNED BENEFICIALLY BY EACH UNDERWRITER FOR THE OBLIGOR AND EACH
DIRECTOR, PARTNER AND EXECUTIVE OFFICER OF EACH SUCH UNDERWRITER.

<TABLE>
<CAPTION>
   COL. A                 COL. B                 COL. C                    COL. D
                                                                        PERCENTAGE OF
                                                                       VOTING SECURITIES
                                                                        REPRESENTED BY
                                              AMOUNT OWNED             AMOUNT GIVEN IN
NAME OF OWNER         TITLE OF CLASS          BENEFICIALLY                 COL. C
- -------------         --------------          ------------                 ------
<S>                   <C>                     <C>                      <C>


Not applicable by virtue of Form T-1 General Instruction B and response to Item 13.
</TABLE>

ITEM 8.           SECURITIES OF THE OBLIGOR OWNED OR HELD BY THE TRUSTEE.

                  FURNISH THE FOLLOWING INFORMATION AS TO THE SECURITIES OF THE
OBLIGOR OWNED BENEFICIALLY OR HELD AS COLLATERAL SECURITY FOR OBLIGATIONS IN
DEFAULT BY THE TRUSTEE.

<TABLE>
<CAPTION>
    COL. A                COL. B                   COL. C                  COL. D
                                               AMOUNT OWNED
                        WHETHER THE           BENEFICIALLY OR            PERCENT OF
                        SECURITIES           HELD AS COLLATERAL             CLASS
                        ARE VOTING            SECURITY FOR             REPRESENTED BY
                       OR NONVOTING          OBLIGATIONS IN              AMOUNT GIVEN
TITLE OF CLASS          SECURITIES               DEFAULT                  IN COL. C
- --------------          ----------               -------                  ---------
<S>                    <C>                  <C>                        <C>

Not applicable by virtue of Form T-1 General Instruction B and response to Item 13.
</TABLE>







                                       3
<PAGE>   6

ITEM 9.           SECURITIES OF UNDERWRITERS OWNED OR HELD BY THE TRUSTEE.

                  IF THE TRUSTEE OWNS BENEFICIALLY OR HOLDS AS COLLATERAL
SECURITY FOR OBLIGATIONS IN DEFAULT ANY SECURITIES OF AN UNDERWRITER FOR THE
OBLIGOR, FURNISH THE FOLLOWING INFORMATION AS TO EACH CLASS OF SECURITIES OF
SUCH UNDERWRITER ANY OF WHICH ARE SO OWNED OR HELD BY THE TRUSTEE.

<TABLE>
<CAPTION>
   COL. A                 COL. B                COL. C                      COL. D
                                             AMOUNT OWNED
                                            BENEFICIALLY OR              PERCENT OF
                                           HELD AS COLLATERAL               CLASS
NAME OF ISSUER                               SECURITY FOR              REPRESENTED BY
      AND                 AMOUNT            OBLIGATIONS IN              AMOUNT GIVEN
TITLE OF CLASS          OUTSTANDING        DEFAULT BY TRUSTEE             IN COL. C
- --------------          -----------        ------------------             ---------
<S>                     <C>                <C>                        <C>


Not applicable by virtue of Form T-1 General Instruction B and response to Item 13.
</TABLE>

ITEM 10.          OWNERSHIP OR HOLDINGS BY THE TRUSTEE OF VOTING SECURITIES
                  OF CERTAIN AFFILIATES OR SECURITY HOLDERS OF THE OBLIGOR.

                  IF THE TRUSTEE OWNS BENEFICIALLY OR HOLDS AS COLLATERAL
SECURITY FOR OBLIGATIONS IN DEFAULT VOTING SECURITIES OF A PERSON WHO, TO THE
KNOWLEDGE OF THE TRUSTEE (1) OWNS 10% OR MORE OF THE VOTING SECURITIES OF THE
OBLIGOR OR (2) IS AN AFFILIATE, OTHER THAN A SUBSIDIARY, OF THE OBLIGOR, FURNISH
THE FOLLOWING INFORMATION AS TO THE VOTING SECURITIES OF SUCH PERSON.

<TABLE>
<CAPTION>
   COL. A                 COL. B                COL. C                      COL. D
                                             AMOUNT OWNED
                                            BENEFICIALLY OR              PERCENT OF
                                           HELD AS COLLATERAL               CLASS
NAME OF ISSUER                               SECURITY FOR              REPRESENTED BY
      AND                 AMOUNT            OBLIGATIONS IN              AMOUNT GIVEN
TITLE OF CLASS          OUTSTANDING        DEFAULT BY TRUSTEE             IN COL. C
- --------------          -----------        ------------------             ---------
<S>                     <C>                <C>                        <C>


Not applicable by virtue of Form T-1 General Instruction B and response to Item 13.
</TABLE>




                                       4
<PAGE>   7

ITEM 11.          OWNERSHIP OR HOLDINGS BY THE TRUSTEE OF ANY SECURITIES OF
                  A PERSON OWNING 50% OR MORE OF THE VOTING SECURITIES OF THE
                  OBLIGOR.

                  IF THE TRUSTEE OWNS BENEFICIALLY OR HOLDS AS COLLATERAL
SECURITY FOR OBLIGATIONS IN DEFAULT ANY SECURITIES OF A PERSON WHO, TO THE
KNOWLEDGE OF THE TRUSTEE, OWNS 50% OR MORE OF THE VOTING SECURITIES OF THE
OBLIGOR, FURNISH THE FOLLOWING INFORMATION AS TO EACH CLASS OF SECURITIES OR
SUCH PERSON ANY OF WHICH ARE SO OWNED OR HELD BY THE TRUSTEE.

<TABLE>
<CAPTION>
   COL. A                 COL. B                COL. C                      COL. D
                                             AMOUNT OWNED
                                            BENEFICIALLY OR              PERCENT OF
                                           HELD AS COLLATERAL               CLASS
NAME OF ISSUER                               SECURITY FOR              REPRESENTED BY
      AND                 AMOUNT            OBLIGATIONS IN              AMOUNT GIVEN
TITLE OF CLASS          OUTSTANDING        DEFAULT BY TRUSTEE             IN COL. C
- --------------          -----------        ------------------             ---------
<S>                     <C>                <C>                        <C>


Not applicable by virtue of Form T-1 General Instruction B and response to Item 13.
</TABLE>

ITEM 12.          INDEBTEDNESS OF THE OBLIGOR TO THE TRUSTEE.

                  EXCEPT AS NOTED IN THE INSTRUCTIONS, IF THE OBLIGOR IS
INDEBTED TO THE TRUSTEE, FURNISH THE FOLLOWING INFORMATION:

<TABLE>
<CAPTION>
       COL. A                           COL. B                     COL. C

      NATURE OF                        AMOUNT
    INDEBTEDNESS                     OUTSTANDING                  DATE DUE
    ------------                     -----------                  --------
<S>                                  <C>                          <C>

Not applicable by virtue of Form T-1 General Instruction B and response to Item 13.
</TABLE>

ITEM 13.          DEFAULTS BY THE OBLIGOR.

         (a)      STATE WHETHER THERE IS OR HAS BEEN A DEFAULT WITH RESPECT TO
THE SECURITIES UNDER THIS INDENTURE. EXPLAIN THE NATURE OF ANY SUCH DEFAULT.

         There is not, nor has there been, a default with respect to the
securities under this indenture. (See Note on Page 7.)




                                       5
<PAGE>   8

ITEM 13. (CONTINUED)

         (b) IF THE TRUSTEE IS A TRUSTEE UNDER ANOTHER INDENTURE UNDER WHICH ANY
SECURITIES, OR CERTIFICATES OF INTEREST OR PARTICIPATION IN ANY OTHER
SECURITIES, OF THE OBLIGOR ARE OUTSTANDING, OR IS TRUSTEE FOR MORE THAN ONE
OUTSTANDING SERIES OF SECURITIES UNDER THE INDENTURE, STATE WHETHER THERE HAS
BEEN A DEFAULT UNDER ANY SUCH INDENTURE OR SERIES, IDENTIFY THE INDENTURE OR
SERIES AFFECTED, AND EXPLAIN THE NATURE OF ANY SUCH DEFAULT.

         There has not been a default under any such indenture or series. (See
Note on Page 7.)

ITEM 14.          AFFILIATIONS WITH THE UNDERWRITERS.

                  IF ANY UNDERWRITER IS AN AFFILIATE OF THE TRUSTEE, DESCRIBE
EACH SUCH AFFILIATION.

       Not applicable by virtue of Form T-1 General Instruction B and response
to Item 13.

ITEM 15.          FOREIGN TRUSTEE.

                  IDENTIFY THE ORDER OR RULE PURSUANT TO WHICH THE FOREIGN
TRUSTEE IS AUTHORIZED TO ACT AS SOLE TRUSTEE UNDER INDENTURES QUALIFIED OR TO BE
QUALIFIED UNDER THE ACT.

                  Not applicable.

ITEM 16.          LIST OF EXHIBITS.

                  LIST BELOW ALL EXHIBITS FILED AS PART OF THIS STATEMENT OF
ELIGIBILITY.

                  o 1. A copy of the articles of association of the trustee now
                  in effect.

                  # 2. A copy of the certificate of authority of the trustee to
                  commence business.

                  * 3. A copy of the certificate of authorization of the trustee
                  to exercise corporate trust powers issued by the Board of
                  Governors of the Federal Reserve System under date of January
                  21, 1948.

                  + 4. A copy of the existing bylaws of the trustee.

                    5. Not applicable.




                                       6
<PAGE>   9

                    6. The consent of the United States institutional trustees
                  required by Section 321(b) of the Act.

                  []7. A copy of the latest report of condition of the trustee
                  published pursuant to law or the requirements of its
                  supervising or examining authority.

                    8. Not applicable.

                    9. Not applicable.

                      NOTE REGARDING INCORPORATED EXHIBITS

         Effective January 20, 1998, the name of the Trustee was changed from
Texas Commerce Bank National Association to Chase Bank of Texas, National
Association. The exhibits incorporated herein by reference, except for Exhibit
7, were filed under the former name of the Trustee.

         o Incorporated by reference to exhibit bearing the same designation and
previously filed with the Securities and Exchange Commission as exhibits to the
Form S-3 File No. 33-56195.

         # Incorporated by reference to exhibit bearing the same designation and
previously filed with the Securities and Exchange Commission as exhibits to the
Form S-3 File No. 33-42814.

         * Incorporated by reference to exhibit bearing the same designation and
previously filed with the Securities and Exchange Commission as exhibits to the
Form S-11 File No. 33-25132.

         + Incorporated by reference to exhibit bearing the same designation and
previously filed with the Securities and Exchange Commission as exhibits to the
Form S-3 File No. 33-65055.

         [] Incorporated by reference to exhibit bearing the same designation
and previously filed with the Securities and Exchange Commission as exhibits to
the Form S-3 File No. 333-52197.

                                      NOTE

            Inasmuch as this Form T-1 is filed prior to the ascertainment by the
trustee of all facts on which to base responsive answers to Items 2 and 13, the
answers to said Items are based on incomplete information. Such Items may,
however, be considered as correct unless amended by an amendment to this Form
T-1.





                                       7
<PAGE>   10

                                   SIGNATURE

         PURSUANT TO THE REQUIREMENTS OF THE TRUST INDENTURE ACT OF 1939 THE
TRUSTEE, CHASE BANK OF TEXAS, NATIONAL ASSOCIATION, FORMERLY KNOWN AS TEXAS
COMMERCE BANK NATIONAL ASSOCIATION, A NATIONAL BANKING ASSOCIATION ORGANIZED AND
EXISTING UNDER THE LAWS OF THE UNITED STATES OF AMERICA, HAS DULY CAUSED THIS
STATEMENT OF ELIGIBILITY TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED,
THEREUNTO AUTHORIZED, ALL IN THE CITY OF HOUSTON, AND STATE OF TEXAS, ON THE 9TH
DAY OF JUNE, 1998.

                                         CHASE BANK OF TEXAS, NATIONAL
                                             ASSOCIATION, AS TRUSTEE


                                         By: /s/ MAURI J. COWEN
                                            ----------------------------------
                                                 Mauri J. Cowen
                                            Vice President and Trust Officer






                                       8
<PAGE>   11

                                                                       EXHIBIT 6



Securities and Exchange Commission
Washington, D.C. 20549

Gentlemen:

         The undersigned is trustee under an Indenture between Marine Drilling
Companies, Inc., a Texas corporation (the "Company"), together with certain
subsidiary guarantors, and Chase Bank of Texas, National Association, as
Trustee, entered into in connection with the issuance of the Company's
Subordinate Debt Securities.

         In accordance with Section 321(b) of the Trust Indenture Act of 1939,
the undersigned hereby consents that reports of examinations of the undersigned,
made by Federal or State authorities authorized to make such examinations, may
be furnished by such authorities to the Securities and Exchange Commission upon
its request therefor.

                                         Very truly yours,

                                         CHASE BANK OF TEXAS, NATIONAL
                                             ASSOCIATION, AS TRUSTEE


                                         By: /s/ MAURI J. COWEN
                                            ----------------------------------
                                                 Mauri J. Cowen
                                            Vice President and Trust Officer


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