INPUT OUTPUT INC
SC 13D/A, 1999-08-18
MEASURING & CONTROLLING DEVICES, NEC
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<PAGE>   1

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                 --------------

                               AMENDMENT NO. 1 TO
                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934

                               Input/Output, Inc.
- -------------------------------------------------------------------------------
                              (Name of the Issuer)


                     Common Stock, par value $.01 per share
- -------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    457652105
- -------------------------------------------------------------------------------
                                 (CUSIP Number)

                                  SCF-IV, L.P.
                             600 Travis, Suite 6600
                              Houston, Texas 77002
                          Attention: Anthony F. DeLuca
                                 (713) 227-7888
- -------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)


                                 August 17, 1999
- -------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Section 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check
the following box. [ ]


<PAGE>   2

- -------------------------------------------------------------------------------
1        NAMES OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

         SCF-IV, L.P.

- -------------------------------------------------------------------------------
2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP           (a)  [ ]
                                                                    (b)  [X]

- -------------------------------------------------------------------------------
3        SEC USE ONLY

- -------------------------------------------------------------------------------
4        SOURCE OF FUNDS

         OO

- -------------------------------------------------------------------------------
5        CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS                     [ ]
         REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)

- -------------------------------------------------------------------------------
6        CITIZENSHIP OR PLACE OF ORGANIZATION

         Delaware
- -------------------------------------------------------------------------------
    NUMBER       7        SOLE VOTING POWER
      OF
    SHARES                        6,764,705*
 BENEFICIALLY    --------------------------------------------------------------
     OWNED       8        SHARED VOTING POWER
      BY                          None
     EACH        --------------------------------------------------------------
   REPORTING     9        SOLE DISPOSITIVE POWER
    PERSON
     WITH                         6,764,705*
                 --------------------------------------------------------------
                 10       SHARED DISPOSITIVE POWER
                                  None
- -------------------------------------------------------------------------------
11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         6,764,705*
- -------------------------------------------------------------------------------
12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
         CERTAIN SHARES                                                  [X]

- -------------------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         11.8%**
- -------------------------------------------------------------------------------
14       TYPE OF REPORTING PERSON
         PN
- -------------------------------------------------------------------------------

         *     The reporting person owns 40,000 shares of Series B Preferred
               Stock and 15,000 shares of Series C Preferred Stock of the
               Issuer. The Series B Preferred Stock and the Series C Preferred
               Stock will not be convertible into Common Stock until the earlier
               of May 7, 2002 or certain change of control events. The Series B
               Preferred Stock and Series C Preferred Stock will automatically
               be converted into Common Stock on May 7, 2004. Based on the
               Series B Preferred Stock's $8.00 fixed conversion price, the
               Series B Preferred Stock would be convertible into 5,000,000
               shares of Common Stock of the Issuer. Based on the Series C
               Preferred Stock's $8.50 fixed conversion price, the Series C
               Preferred Stock would be convertible into 1,764,705 shares of
               Common Stock of the Issuer. The amount indicated for both the
               Series B Preferred Stock and the Series C Preferred Stock
               excludes an indeterminate number of additional shares of Common
               Stock that may be acquired upon conversion of the Series B
               Preferred Stock or Series C Preferred Stock based on certain
               market price based conversion provisions set forth in the
               Certificate of Designation relating to such series, or in respect
               of accrued and unpaid dividends.
         **    Based on information provided by the Issuer as of August 13,
               1999.
- -------------------------------------------------------------------------------

                                       -2-


<PAGE>   3

- -------------------------------------------------------------------------------
1        NAMES OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

         SCF-IV, G.P., Limited Partnership

- -------------------------------------------------------------------------------
2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP           (a)  [ ]
                                                                    (b)  [X]

- -------------------------------------------------------------------------------
3        SEC USE ONLY

- -------------------------------------------------------------------------------
4        SOURCE OF FUNDS

         AF

- -------------------------------------------------------------------------------
5        CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS                     [ ]
         REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)

- -------------------------------------------------------------------------------
6        CITIZENSHIP OR PLACE OF ORGANIZATION

         Delaware
- -------------------------------------------------------------------------------
    NUMBER       7        SOLE VOTING POWER
      OF
    SHARES                        6,764,705*
 BENEFICIALLY    --------------------------------------------------------------
     OWNED       8        SHARED VOTING POWER
      BY                          None
     EACH        --------------------------------------------------------------
   REPORTING     9        SOLE DISPOSITIVE POWER
    PERSON
     WITH                         6,764,705*
                 --------------------------------------------------------------
                 10       SHARED DISPOSITIVE POWER
                                  None
- -------------------------------------------------------------------------------
11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         6,764,705*
- -------------------------------------------------------------------------------
12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
         CERTAIN SHARES                                                  [X]

- -------------------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         11.8%**
- -------------------------------------------------------------------------------
14       TYPE OF REPORTING PERSON
         PN
- -------------------------------------------------------------------------------

         *     The reporting person may be deemed to own beneficially 40,000
               shares of Series B Preferred Stock and 15,000 shares of Series C
               Preferred Stock of the Issuer. The Series B Preferred Stock and
               the Series C Preferred Stock will not be convertible into Common
               Stock until the earlier of May 7, 2002 or certain change of
               control events. The Series B Preferred Stock and Series C
               Preferred Stock will automatically be converted into Common Stock
               on May 7, 2004. Based on the Series B Preferred Stock's $8.00
               fixed conversion price, the Series B Preferred Stock would be
               convertible into 5,000,000 shares of Common Stock of the Issuer.
               Based on the Series C Preferred Stock's $8.50 fixed conversion
               price, the Series C Preferred Stock would be convertible into
               1,764,705 shares of Common Stock of the Issuer. The amount
               indicated for both the Series B Preferred Stock and the Series C
               Preferred Stock excludes an indeterminate number of additional
               shares of Common Stock that may be acquired upon conversion of
               the Series B Preferred Stock or Series C Preferred Stock based on
               certain market price based conversion provisions set forth in the
               Certificate of Designation relating to such series, or in respect
               of accrued and unpaid dividends.
         **    Based on information provided by the Issuer as of August 13,
               1999.
- --------------------------------------------------------------------------------


                                       -3-


<PAGE>   4


- -------------------------------------------------------------------------------
1        NAMES OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

         L.E. Simmons & Associates, Incorporated

- -------------------------------------------------------------------------------
2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP           (a)  [ ]
                                                                    (b)  [X]

- -------------------------------------------------------------------------------
3        SEC USE ONLY

- -------------------------------------------------------------------------------
4        SOURCE OF FUNDS

         AF

- -------------------------------------------------------------------------------
5        CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS                     [ ]
         REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)

- -------------------------------------------------------------------------------
6        CITIZENSHIP OR PLACE OF ORGANIZATION

         Delaware
- -------------------------------------------------------------------------------
    NUMBER       7        SOLE VOTING POWER
      OF
    SHARES                        6,764,705*
 BENEFICIALLY    --------------------------------------------------------------
     OWNED       8        SHARED VOTING POWER
      BY                          None
     EACH        --------------------------------------------------------------
   REPORTING     9        SOLE DISPOSITIVE POWER
    PERSON
     WITH                         6,764,705*
                 --------------------------------------------------------------
                 10       SHARED DISPOSITIVE POWER
                                  None
- -------------------------------------------------------------------------------
11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         6,764,705*
- -------------------------------------------------------------------------------
12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
         CERTAIN SHARES                                                  [X]

- -------------------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         11.8%**
- -------------------------------------------------------------------------------
14       TYPE OF REPORTING PERSON
         CO
- -------------------------------------------------------------------------------

         *     The reporting person may be deemed to own beneficially 40,000
               shares of Series B Preferred Stock and 15,000 shares of Series C
               Preferred Stock of the Issuer. The Series B Preferred Stock and
               the Series C Preferred Stock will not be convertible into Common
               Stock until the earlier of May 7, 2002 or certain change of
               control events. The Series B Preferred Stock and Series C
               Preferred Stock will automatically be converted into Common Stock
               on May 7, 2004. Based on the Series B Preferred Stock's $8.00
               fixed conversion price, the Series B Preferred Stock would be
               convertible into 5,000,000 shares of Common Stock of the Issuer.
               Based on the Series C Preferred Stock's $8.50 fixed conversion
               price, the Series C Preferred Stock would be convertible into
               1,764,705 shares of Common Stock of the Issuer. The amount
               indicated for both the Series B Preferred Stock and the Series C
               Preferred Stock excludes an indeterminate number of additional
               shares of Common Stock that may be acquired upon conversion of
               the Series B Preferred Stock or Series C Preferred Stock based on
               certain market price based conversion provisions set forth in the
               Certificate of Designation relating to such series, or in respect
               of accrued and unpaid dividends.
         **    Based on information provided by the Issuer as of August 13,
               1999.
- -------------------------------------------------------------------------------


                                       -4-


<PAGE>   5

- -------------------------------------------------------------------------------
1        NAMES OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

         L.E. Simmons

- -------------------------------------------------------------------------------
2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP           (a)  [ ]
                                                                    (b)  [X]

- -------------------------------------------------------------------------------
3        SEC USE ONLY

- -------------------------------------------------------------------------------
4        SOURCE OF FUNDS

         AF

- -------------------------------------------------------------------------------
5        CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS                     [ ]
         REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)

- -------------------------------------------------------------------------------
6        CITIZENSHIP OR PLACE OF ORGANIZATION

         Delaware
- -------------------------------------------------------------------------------
    NUMBER       7        SOLE VOTING POWER
      OF
    SHARES                        6,764,705*
 BENEFICIALLY    --------------------------------------------------------------
     OWNED       8        SHARED VOTING POWER
      BY                          None
     EACH        --------------------------------------------------------------
   REPORTING     9        SOLE DISPOSITIVE POWER
    PERSON
     WITH                         6,764,705*
                 --------------------------------------------------------------
                 10       SHARED DISPOSITIVE POWER
                                  None
- -------------------------------------------------------------------------------
11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         6,764,705*
- -------------------------------------------------------------------------------
12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
         CERTAIN SHARES                                                  [X]

- -------------------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         11.8%**
- -------------------------------------------------------------------------------
14       TYPE OF REPORTING PERSON
         IN
- -------------------------------------------------------------------------------

          *     The reporting person may be deemed to own beneficially 40,000
                shares of Series B Preferred Stock and 15,000 shares of Series C
                Preferred Stock of the Issuer. The Series B Preferred Stock and
                the Series C Preferred Stock will not be convertible into Common
                Stock until the earlier of May 7, 2002 or certain change of
                control events. The Series B Preferred Stock and Series C
                Preferred Stock will automatically be converted into Common
                Stock on May 7, 2004. Based on the Series B Preferred Stock's
                $8.00 fixed conversion price, the Series B Preferred Stock would
                be convertible into 5,000,000 shares of Common Stock of the
                Issuer. Based on the Series C Preferred Stock's $8.50 fixed
                conversion price, the Series C Preferred Stock would be
                convertible into 1,764,705 shares of Common Stock of the Issuer.
                The amount indicated for both the Series B Preferred Stock and
                the Series C Preferred Stock excludes an indeterminate number of
                additional shares of Common Stock that may be acquired upon
                conversion of the Series B Preferred Stock or Series C Preferred
                Stock based on certain market price based conversion provisions
                set forth in the Certificate of Designation relating to such
                series, or in respect of accrued and unpaid dividends.
          **    Based on information provided by the Issuer as of August 13,
                1999.
- -------------------------------------------------------------------------------


                                       -5-


<PAGE>   6



         Reference is made to the Statement on Schedule 13D (the "Statement")
filed on April 30, 1999 by the Reporting Persons with respect to their
beneficial ownership of common stock, par value $.01 per share (the "Common
Stock"), of Input/Output, Inc., a Delaware corporation (the "Issuer").
Capitalized terms used but not defined herein shall have the respective meanings
assigned to such terms in the Statement.

ITEM 3.           SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         Item 3 of the Statement is amended to add the following:

         On May 7, 1999, SCF-IV purchased 40,000 shares of Series B Preferred
Stock for $40,000,000 pursuant to the Purchase Agreement. On August 17, 1999,
SCF-IV purchased 15,000 shares of Series C Preferred Stock for $15,000,000
pursuant to the Purchase Agreement. SCF-IV obtained the consideration for these
purchases from its partners in the form of capital contributions.

ITEM 4.           PURPOSE OF TRANSACTION.

         Item 4 of the Statement is amended to add the following:

         The Shares are held for investment purposes. SCF-IV intends to review
its investment in the Issuer on a continuing basis and, depending upon the price
of, and other market conditions relating to, the Common Stock of the Issuer,
subsequent developments affecting the Issuer, the Issuer's business and
prospects, other investment and business opportunities available to SCF-IV,
general stock market and economic conditions, tax considerations and other
factors deemed relevant, SCF-IV may decide to increase or decrease the size of
its investment in the Issuer, subject to the terms of the Purchase Agreement.

         In accordance with the terms of the Purchase Agreement and the Shares,
the Issuer has increased its Board of Directors by one and appointed David C.
Baldwin, as SCF-IV's designee, to the Board of Directors. The holders of Series
B Preferred Stock and the Series C Preferred Stock, voting together with
Permitted Parity Securities (which are defined as up to 20,000 shares of
preferred stock, each share of which (i) has a liquidation preference of not
more than $1,000 per share, (ii) has a dividend rate of not more than one
percent per annum, (iii) has no more than one vote per share with respect to
matters on which it votes together with the Series B Preferred Stock and Series
C Preferred Stock and (iv) is pari passu with the Series B Preferred Stock and
Series C Preferred Stock with respect to the payment of dividends and
distributions upon liquidation) as a separate class with one vote per share, are
entitled to elect one member of the Board of Directors of the Issuer.

         Additionally, holders of the Series B Preferred Stock and the Series C
Preferred Stock are entitled to vote upon all matters upon which the holders of
Common Stock are entitled to vote. The holders of Series B Preferred Stock, when
voting together with the Common Stock as a single class, are entitled to cast a
number of votes equal to $1,000.00 (plus any accrued and unpaid dividends
through the record date for determining shareholders entitled to vote) divided
by the conversion price of $8.00 (as adjusted from time to time in accordance
with the Series B Preferred Stock's Certificate of Designation). The holders of
Series C Preferred Stock, when voting together with the Common Stock as a single
class, are entitled to cast a number of votes equal to $1,000.00 (plus any
accrued and

                                       -6-


<PAGE>   7



unpaid dividends through the record date for determining shareholders entitled
to vote) divided by the conversion price of $8.50 (as adjusted from time to time
in accordance with the Series C Preferred Stock's Certificate of Designation).

         The Purchase Agreement, the Certificates of Designation relating to the
Series B Preferred Stock and the Series C Preferred Stock, and the Registration
Rights Agreement are included as exhibits hereto and incorporated herein by
reference.

ITEM 5.           INTEREST IN SECURITIES OF THE ISSUER

         Item 5 of the Statement is amended to add the following:

         (a) and (b). Based upon information provided by the Issuer, 50,667,631
shares of Common Stock were issued and outstanding as of August 13, 1999. SCF-IV
may be deemed to beneficially own 6,764,705 shares of Common Stock based on its
ownership of 40,000 shares of Series B Preferred Stock and 15,000 shares of
Series C Preferred Stock. The 6,764,705 shares of Common Stock represent shares
issuable to SCF-IV upon conversion of (i) the Series B Preferred Stock based on
an $8.00 fixed conversion price and (ii) the Series C Preferred Stock based upon
an $8.50 fixed conversion price. Such 6,764,705 shares of Common Stock would
constitute approximately 11.8% of the issued and outstanding Common Stock of the
Issuer. This amount excludes an indeterminate number of additional shares of
Common Stock that may be acquired by SCF-IV upon conversion of the Shares
pursuant to market price based conversions, or in respect of accrued and unpaid
dividends.

         SCF-IV G.P. does not directly own any securities of the Issuer, but,
because it is the sole general partner of SCF-IV, it may be deemed to
beneficially own all of the shares of Common Stock of the Issuer SCF-IV is
deemed to beneficially own as described above. Simmons & Associates does not
directly own any securities of the Issuer, but, because it is the sole general
partner of SCF-IV G.P., it may be deemed to beneficially own all of the shares
of Common Stock of the Issuer SCF-IV G.P. is deemed to beneficially own. L. E.
Simmons does not directly own any securities of the Issuer, but, because he is
the sole stockholder of Simmons & Associates, he may be deemed to beneficially
own all of the shares of Common Stock of the Issuer Simmons & Associates is
deemed to beneficially own.

         The Shares will not be convertible into Common Stock until the earlier
of May 7, 2002 or certain change of control events. Thus, SCF-IV and the other
Reporting Persons disclaim beneficial ownership of such shares of Common Stock.

         (c). Other than the transactions described herein, neither SCF-IV nor
any person identified in Item 2 has effected any transactions in the Common
Stock of the Issuer during the preceding sixty days.

ITEM 7.           MATERIAL TO BE FILED AS EXHIBITS

    *A.           Purchase Agreement by and between SCF-IV and the Issuer, dated
                  April 21, 1999.


                                       -7-


<PAGE>   8



         B.       Certificate of Designation related to Series B Preferred Stock
                  (incorporated by reference to Exhibit 4.1 to the Issuer's
                  Current Report on Form 8-K filed with the Securities and
                  Exchange Commission on May 7, 1999).

       **C.       Certificate of Designation related to Series C Preferred
                  Stock.

         D.       Registration Rights Agreement by and between SCF-IV and the
                  Issuer, dated May 7, 1999 (incorporated by reference to
                  Exhibit 10.2 to the Issuer's Current Report on Form 8-K filed
                  with the Securities and Exchange Commission on May 7, 1999).

        *E.       Joint Filing Agreement, dated as of April 30, 1999, by and
                  among SCF-IV, SCF-IV G.P., Simmons & Associates and L. E.
                  Simmons.

         ---------------
         *        Previously filed.
         **       Filed herewith.


                                       -8-


<PAGE>   9

                                    SIGNATURE

         After reasonable inquiry and to the best of my knowledge and belief,
each of the undersigned certifies that the information set forth in this
statement is true, complete and correct.

Dated:   August 18, 1999

                    SCF-IV, L.P.

                    By:      SCF-IV, G.P., Limited Partnership

                             By:      L. E. Simmons & Associates, Incorporated

                                      By: /s/ L. E. Simmons
                                          ------------------------------------
                                              L. E. Simmons, President

                    SCF-IV, G.P., LIMITED PARTNERSHIP

                    By:      L. E. Simmons & Associates, Incorporated

                             By: /s/ L. E. Simmons
                                 ------------------------------------
                                     L. E. Simmons, President

                    L. E. SIMMONS & ASSOCIATES, INCORPORATED

                    By: /s/ L. E. Simmons
                        ------------------------------------
                            L. E. Simmons, President

                    L. E. SIMMONS

                    /s/ L. E. Simmons
                    ----------------------------------------
                        L. E. Simmons, individually


                                    -9-


<PAGE>   10

                                  EXHIBIT INDEX

<TABLE>
<CAPTION>
      Exhibit
      Number                       Description
      -------                      -----------
<S>              <C>
        *A.       Purchase Agreement by and between SCF-IV and the Issuer, dated
                  April 21, 1999.

         B.       Certificate of Designation related to Series B Preferred Stock
                  (incorporated by reference to Exhibit 4.1 to the Issuer's
                  Current Report on Form 8-K filed with the Securities and
                  Exchange Commission on May 7, 1999).

       **C.       Certificate of Designation related to Series C Preferred
                  Stock.

         D.       Registration Rights Agreement by and between SCF-IV and the
                  Issuer, dated May 7, 1999 (incorporated by reference to
                  Exhibit 10.2 to the Issuer's Current Report on Form 8-K filed
                  with the Securities and Exchange Commission on May 7, 1999).

        *E.       Joint Filing Agreement, dated as of April 30, 1999, by and
                  among SCF-IV, SCF-IV G.P., Simmons & Associates and L. E.
                  Simmons.
</TABLE>

         ---------------
         *        Previously filed.
         **       Filed herewith.




<PAGE>   1


                                                                       EXHIBIT C

                           CERTIFICATE OF DESIGNATION
                                       OF
                            SERIES C PREFERRED STOCK
                                       OF
                               INPUT/OUTPUT, INC.

         Pursuant to Section 151(g) of the Delaware General Corporation Law,
Input/Output, Inc., a corporation organized and existing under the laws of the
State of Delaware (the "Company"), hereby certifies that the following
resolution was duly adopted by the Board of Directors of the Company on April
21, 1999, pursuant to authority conferred upon the Board of Directors by the
Certificate of Incorporation of the Company (the "Certificate of
Incorporation"), which authorizes the issuance of up to 5,000,000 shares of
preferred stock, $0.01 par value.

         RESOLVED, that pursuant to authority expressly granted to and vested in
the Board of Directors of the Company and pursuant to the provisions of the
Certificate of Incorporation, the Board of Directors hereby creates a series of
preferred stock, herein designated and authorized as the Series C Preferred
Stock, $0.01 par value per share, which shall consist of 15,000 of the 5,000,000
shares of preferred stock which the Company now has authority to issue, and the
Board of Directors hereby fixes the powers, designations, preferences and
relative, participating, optional and other special rights of the shares of such
series, and the qualifications, limitations and restrictions thereof as follows:

         1. Number and Rank. The number of shares constituting the Series C
Preferred Stock shall be 15,000. The Series C Preferred Stock shall rank senior
to the Company's Series A Preferred Stock with respect to the payment of
dividends and distributions on Liquidation and on parity with the Series B
Preferred Stock with respect to the payment of dividends and distributions on
Liquidation.

         2. Definitions. Unless the context otherwise requires, when used herein
the following terms shall have the meaning indicated.

         "Adjusted Stated Value" with respect to each share of Series C
Preferred Stock means the Stated Value (a) increased at an annual rate of 8%
thereof, compounded quarterly, less (b) the amount of cash dividends actually
paid with respect to such share, in each case commencing on the Issue Date and
accruing through the applicable Conversion Date, or, in the case of a redemption
being effected pursuant to Sections 6(H) or 6(I), through the date of payment of
the redemption price.


         "Affiliate" means with respect to any Person, any other Person
directly, or indirectly through one or more intermediaries, controlling,
controlled by or under common control with such Person. For purposes of this
definition, the term "control" (and correlative terms "controlling," "controlled
by" and "under common control with") means possession of the power, whether by
contract, equity ownership or otherwise, to direct the policies or management of
a Person.




<PAGE>   2



         "Average Market Price" means, for a given security, the average Market
Price for such security for the ten Trading Day period ending on and including
the Trading Day prior to the date of determination; provided, however, that if
during such period the Company takes any action or an action becomes effective
that would require an adjustment to the Conversion Price pursuant to Section 7
hereof, then such Average Market Price shall be appropriately adjusted to
reflect such action in a manner consistent with the adjustments set forth in
Section 7.

         "Beneficially Own" or "Beneficial Ownership" has the meaning set forth
in Rules 13d-3 and 13d-5 of the Exchange Act.

         "Board" means the Board of Directors of the Company.

         "Business Combination" means (i) any consolidation or merger of the
Company with or into any Person or (ii) any Change of Control Stock Issuance, or
(iii) the sale, assignment conveyance, transfer, lease or other disposition by
the Company of all or substantially all of its assets followed by a liquidation
of the Company.

         "Business Day" means any day except Saturday, Sunday and any day which
shall be a legal holiday or a day on which banking institutions in Houston,
Texas generally are authorized or required by law or other governmental actions
to close.

         "Capital Stock" means (i) with respect to any Person that is a
corporation, any and all shares, interests, participations or other equivalents
(however designated) of capital or capital stock of such Person and (ii) with
respect to any Person that is not a corporation, any and all partnership or
other equity interests of such Person.

         "Certificate" means the Certificate of Incorporation of the Company, as
amended (including any certificate of designation establishing a series of
preferred stock).

         "Certificate of Designation" means this Certificate of Designation of
the Series C Preferred Stock.

         "Change of Control Stock Issuance" shall mean any issuance, in a single
transaction or series of related transactions, by the Company of shares of
Common Stock or Common Stock Equivalents in connection with the acquisition of
assets (including cash) or securities by the Company or a Subsidiary of the
Company (including by way of a merger of a Subsidiary of the Company with or
into a Person), except where (i) the shareholders of the Company immediately
prior to such issuance own (in substantially the same proportion relative to
each other as such shareholders owned the Common Stock or Voting Stock of the
Company, as the case may be, immediately prior to such consummation) (x) more
than 50% of the Voting Stock of the Company immediately after such issuance, and
(y) more than 50% of the outstanding Common Stock immediately after such
issuance, (ii) the members of the Board immediately prior to entering into the
agreement relating to such issuance (or if no such agreement is entered into,
then immediately prior to the consummation of such issuance) constitute at least
a majority of the Board immediately after such issuance, with no agreements or
arrangements in place immediately after such consummation that would result in
the members of the Board immediately prior to the entering into the agreement
relating to such issuance



<PAGE>   3



ceasing to constitute at least a majority of the Board and (iii) no Person or
Group of Persons immediately after such issuance is the Beneficial Owner of 40%
or more of the total outstanding Voting Stock of the Company or Common Stock. In
calculating the percentage of the Voting Stock of the Company owned by the
shareholders of the Company immediately prior to an issuance of Common Stock or
Common Stock Equivalents in which there is more than one class or series of
Voting Stock, the percentage of the Voting Stock shall be calculated based on
the number of votes eligible to be cast in the election of the directors of the
Company generally. In calculating the percentages of Voting Stock and Common
Stock owned for purposes of this definition, such calculation shall be
calculated on a basis assuming the exercise or conversion in full of all Common
Stock Equivalents and on a basis disregarding all Common Stock Equivalents, and
the percentage which results in the lower percentage owned by the shareholders
of the Company shall apply in the application of clause (i) above.

         "Common Stock" means the Company's common stock, par value $.01 per
share, and any Capital Stock for or into which such Common Stock hereafter is
exchanged, converted, reclassified or recapitalized by the Company or pursuant
to a Business Combination to which the Company is a party.

         "Common Stock Equivalents" means (without duplication with any other
Common Stock or Common Stock Equivalents) rights, warrants, options, convertible
securities or exchangeable securities, exercisable for or convertible or
exchangeable into, directly or indirectly, Common Stock, whether at the time of
issuance or upon the passage of time or the occurrence of some future event.

         "Company" means Input/Output, Inc. a Delaware corporation.

         "Conversion Date" is defined in Section 6(D).

         "Conversion Price" means $8.50, as adjusted from time to time in
accordance with Section 7.

         "Conversion Ratio" is defined in Section 6(C).

         "DGCL" means the General Corporation Law of the State of Delaware, as
amended, or any successor statute or other legislation.

         "Dividend Payment Date" is defined in Section 3(A).

         "Dividend Period" is defined in Section 3(A).

         "Exchange Act" means the Securities Exchange Act of 1934, as amended,
or any successor statute, and the rules and regulations promulgated thereunder.

         "Excluded Stock" means (i) shares of Common Stock issued by the Company
as a stock dividend payable in shares of Common Stock, or upon any subdivision
or split-up of the outstanding shares of Capital Stock in each case which is
subject to Section 7(B), or upon conversion of shares of Capital Stock (but not
the issuance of such Capital Stock which will be subject to the provisions



<PAGE>   4



of Section 7(A)(iii)), (ii) shares of Common Stock to be issued to employees,
directors, consultants and advisors of the Company pursuant to Stock Plans in
accordance with their respective terms.

         "Group" means a group as contemplated by Section 13(d)(3) of the
Exchange Act.

         "Holder" means a holder of record of Series C Preferred Stock.

         "Initial Conversion Date" means the first to occur of any of the
following: (i) May 7, 2002, (ii) an agreement providing for a Business
Combination is approved by the Board or a Business Combination is consummated,
(iii) a Tender Offer for Common Stock is approved or recommended by the Board or
(iv) there is a redemption, repurchase or reacquisition by the Company of Rights
issued pursuant to the Rights Agreement or any waiver of the application of the
Rights Agreement to any Beneficial Owner other than Purchaser or its Affiliates
except in the case of this clause (iv) as approved by the Purchaser's
representative to the Board.

         "Issue Date" means with respect to any shares of Series C Preferred
Stock the original date of issuance of such shares of Series C Preferred Stock.

         "Junior Securities" means Capital Stock that, with respect to dividends
and distributions upon Liquidation, ranks junior to the Series C Preferred
Stock.

         "Liquidation" means the voluntary or involuntary liquidation,
dissolution or winding up of the Company; provided, however, that a merger or
consolidation shall not be deemed a Liquidation nor shall the sale of assets not
requiring shareholder approval be deemed to be a Liquidation.

         "Liquidation Preference" is defined in Section 5.

         "Mandatory Conversion Date" is defined in Section 6(B).

         "Market Price" means, with respect to a particular security, on any
given day, the last reported sale price regular way or, in case no such reported
sale takes place on such day, the average of the last closing bid and asked
prices regular way, in either case on the principal national securities exchange
on which the applicable security is listed or admitted to trading, or if not
listed or admitted to trading on any national securities exchange, (i) the
closing sale price for such day reported by the Nasdaq Stock Market if such
security is traded over-the-counter and quoted in the Nasdaq Stock Market, or
(ii) if such security is so traded, but not so quoted, the average of the
closing reported bid and asked prices of such security as reported by the Nasdaq
Stock Market or any comparable system, or (iii) if such security is not listed
on the Nasdaq Stock Market or any comparable system but is actively traded, the
average of the closing bid and asked prices as furnished by two members of the
National Association of Securities Dealers, Inc. selected from time to time by
the Company for that purpose. If such security is not listed and traded in a
manner that the quotations referred to above are available for the period
required hereunder, the Market Price shall be deemed to be the fair value per
share of such security as determined by a nationally recognized investment
banking firm selected by the Board and reasonably acceptable to the Holders of a
majority of the outstanding shares of Series C Preferred Stock.


<PAGE>   5



         "Ordinary Cash Dividends" means any cash dividend or distribution
which, when combined on a per share of Common Stock basis with the per share
amounts of all other cash dividends and distributions paid on the Common Stock
during the 365-day period ending on the date of declaration of such dividend or
distribution (as adjusted to appropriately reflect any of the events referred to
in Section 7 and excluding cash dividends or distributions that resulted in an
adjustment to the Conversion Price), does not exceed 5% of the Market Price of a
share of Common Stock on the Trading Day immediately preceding the date of
declaration of such dividend or distribution.

         "Parity Securities" means Capital Stock that, with respect to dividends
or distributions upon Liquidation, is pari passu with the Series C Preferred
Stock.

         "Permitted Parity Securities" means up to 20,000 shares of Preferred
Stock of the Company constituting no more than one series of Preferred Stock,
each share of which (i) has a liquidation preference of not more than $1,000 per
share exclusive of accrued and unpaid dividends, (ii) has a dividend rate of not
more than one percent per annum, (iii) has no more than one vote per share with
respect to matters on which it votes together with the Series C Preferred Stock
and Series B Preferred Stock and other Permitted Parity Securities as a single
class and (iv) is pari passu with the Series C Preferred Stock and Series B
Preferred Stock with respect to the payment of dividends and distributions upon
Liquidation.

         "Person" means an individual or a corporation, partnership, trust,
incorporated or unincorporated association, limited liability company, joint
venture, joint stock company, government (or an agency or political subdivision
thereof) or other entity of any kind.

         "Pro Rata Repurchase" means any purchase of shares of Common Stock by
the Company or any Affiliate thereof pursuant to any tender offer or exchange
offer subject to Section 13(e) of the Exchange Act, or pursuant to any other
offer available to substantially all holders of Common Stock, whether for cash,
shares of capital stock of the Company, other securities of the Company,
evidences of indebtedness of the Company or any other person or any other
property (including, without limitation, shares of capital stock, other
securities or evidences of indebtedness of a subsidiary of the Company), or any
combination thereof; provided, however, that "Pro Rata Repurchase" shall not
include any purchase of shares by the Company or any Affiliate thereof made in
accordance with the requirements of Rule 10b-18 as in effect under the Exchange
Act. The "effective date" of a Pro Rata Repurchase shall mean the date of
acceptance of shares for purchase or exchange under any tender or exchange offer
which is a Pro Rata Repurchase or the date of purchase with respect to any Pro
Rata Repurchase that is not a tender or exchange offer.

         "Purchase Agreement" means the Purchase Agreement dated as of April 21,
1999 between the Company and the Purchaser providing for the purchase by the
Purchaser of 40,000 shares of Series B Preferred Stock and up to 15,000 shares
of Series C Preferred Stock from the Company, including all schedules and
exhibits thereto.

         "Purchaser" means SCF-IV, L.P., a Delaware limited partnership.

         "Record Date" is defined in Section 3(A).



<PAGE>   6


         "Registration Rights Agreement" means the Registration Rights Agreement
dated as of May 7, 1999 between the Company and the Purchaser providing for
certain registration rights under the Securities Act with respect to the Common
Stock into which the Series B Preferred Stock and Series C Preferred Stock may
be converted.

         "Rights Agreement"  has the meaning set forth in Section 6(G).

         "Securities Act" means the Securities Act of 1933, as amended, or any
successor statute, and the rules and regulations promulgated thereunder.

         "Senior Securities" means Capital Stock that, with respect to dividends
or distributions upon Liquidation, ranks senior to the Series C Preferred Stock.

         "Series B Preferred Stock" means the Series B Preferred Stock of the
Company issued to Purchaser pursuant to the Purchase Agreement.

         "Stated Value" is an amount equal to $1,000.00 per share of Series C
Preferred Stock.

         "Stock Plans" means the Company's stock option, stock incentive,
restricted stock, employee stock purchase or other similar plans, in each case
that have been approved by the Company's shareholders.

         "Subsidiary" of a Person means (i) a corporation, a majority of whose
stock with voting power, under ordinary circumstances, to elect directors is at
the time of determination, directly or indirectly, owned by such Person or by
one or more Subsidiaries of such Person, or (ii) any other entity (other than a
corporation) in which such Person or one or more Subsidiaries of such Person,
directly or indirectly, at the date of determination thereof has a majority
ownership interest or, with respect to a limited partnership, is a general
partner of such limited partnership.

         "Tender Offer" means any transaction to which Regulation 14D of the
Exchange Act applies.

         "Trading Day" means a day on which the principal market with respect to
the security in question is regularly scheduled to be open for trading, or if
there is not such principal market, then a day on which the New York Stock
Exchange is regularly scheduled to be open for trading.

         "Voting Stock" of a Person means Capital Stock of such Person of the
class or classes pursuant to which the holders thereof have the general voting
power under ordinary circumstances to vote in the election of the board of
directors, managers or trustees of such Person.

         The foregoing definitions will be equally applicable to both the
singular and plural forms of the defined terms.



<PAGE>   7



         3.       Dividends and Distributions.

                  (A) The holders of Series C Preferred Stock shall be entitled
         to receive out of the assets of the Company legally available for that
         purpose, cumulative preferential cash dividends at a rate per annum of
         one percent (1%) of the Stated Value (equivalent to $10 per annum or
         $2.50 per quarter) for each share of Series C Preferred Stock, and,
         except as provided in Section 3(B), no more, to be paid in accordance
         with the terms of this Section 3. Such dividends shall be cumulative
         from the Issue Date and shall be payable in arrears, when and as
         declared by the Board, on March 31, June 30, September 30 and December
         31 of each year (each such date being herein referred to as a "Dividend
         Payment Date"), commencing on the first such Dividend Payment Date
         following the Issue Date; provided that if any Dividend Payment Date
         shall not be a Business Day, then the Dividend Payment Date shall be on
         the next succeeding day that is a Business Day. The period from the
         Issue Date to the next Dividend Payment Date and each quarterly period
         between consecutive Dividend Payment Dates shall hereinafter be
         referred to as "Dividend Periods." Dividends for the initial Dividend
         Period shall be pro rated on a daily basis commencing on and including
         the Issue Date on the basis of a 360-day year. Each such dividend shall
         be paid to the holders of record of the Series C Preferred Stock as
         their names appear on the share register of the Company on the
         corresponding Record Date. As used above, the term "Record Date" means,
         with respect to the dividend payable on March 31, June 30, September 30
         and December 31, respectively, of each year, the preceding March 15,
         June 15, September 15 and December 15, or such other record date
         designated by the Board with respect to the dividend payable on such
         respective Dividend Payment Date not exceeding 30 days preceding such
         Dividend Payment Date. Dividends on account of arrears for any past
         Dividend Periods may be declared and paid, together with any accrued
         but unpaid interest thereon to and including the date of payment, at
         any time, without reference to any Dividend Payment Date, to holders of
         record on a date designated by the Board, not exceeding 30 days
         preceding the payment date thereof, as may be fixed by the Board.

                  (B) If, on any Dividend Payment Date, the Company fails to pay
         dividends, then until the dividends that were scheduled to be paid on
         such date are paid, such dividends shall cumulate and shall accrue
         additional dividends with respect to such unpaid dividends to and
         including the date of payment thereof at the rate of one percent (1%)
         per annum, compounded on a quarterly basis. Dividends for any period
         less than a full quarterly Dividend Period or for a period commencing
         on a Dividend Payment Date and ending on a Conversion Date shall
         cumulate on a day-to-day basis and shall be computed on the basis of a
         360-day year.

                  (C) So long as any shares of the Series C Preferred Stock
         shall be outstanding, (i) the Company shall not declare or pay any
         dividend whatsoever, whether in cash, property or otherwise, set aside
         any cash or property for the payment of dividends, or make any other
         distribution on any Junior Securities (except a dividend or
         distribution payable solely in shares of Junior Securities), (ii) the
         Company shall not declare or pay any dividend whatsoever, whether in
         cash, property or otherwise, set aside any cash or property for the
         payment of dividends, or make any other distribution on any Parity
         Securities ranking on parity with the Series C Preferred Stock with
         respect to dividends or distributions (except a



<PAGE>   8


         dividend or distribution payable solely in shares of Junior
         Securities), unless declared and paid pro rata with the Series C
         Preferred Stock in proportion to the full amount to which they would
         otherwise be respectively entitled, and (iii) the Company shall not and
         shall cause its Subsidiaries not to repurchase, redeem or otherwise
         acquire or set aside any cash or property for the repurchase or
         redemption of any Junior Securities or Parity Securities, unless in
         each such case all dividends to which the holders of the Series C
         Preferred Stock shall have been entitled for all previous Dividend
         Periods shall have been paid or declared and a sum of money sufficient
         for the payment thereof shall have been set aside.

         4. Voting Rights. The Holders shall have the following voting rights
with respect to the Series C Preferred Stock:

                  (A) Subject to applicable law, the shares of Series C
         Preferred Stock shall have no voting rights other than as set forth in
         this Section 4.

                  (B) Holders of shares of the Series C Preferred Stock shall be
         entitled to vote upon all matters upon which holders of Common Stock
         have the right to vote, and Holders shall have that number of votes on
         all such matters as is equal to the Conversion Ratio that would apply
         if such Holder's shares of Series C Preferred Stock were to be
         converted pursuant to Section 6(A) (using the calculation of such
         Conversion Ratio specified in Section 6(C)(i) and not Section 6(C)(ii)
         for such purpose) as of the record date for the determination of the
         shareholders entitled to vote on such matters, or, if no such record
         date is established as of the date such vote is taken or any written
         consent of shareholders is solicited, such votes to be counted together
         with all other shares of capital stock having general voting powers and
         not separately as a class. Fractional votes shall not, however, be
         permitted and any fractional voting rights resulting from the above
         formula (after aggregating all shares into which shares of Series C
         Preferred Stock held by each Holder could be converted) shall be
         rounded up to the nearest whole number.

                  (C) The Holders of the Series C Preferred Stock, voting
         together with the Series B Preferred Stock and any Permitted Parity
         Securities as a separate class with one vote per share of Series C
         Preferred Stock, shall be entitled to elect one member of the Board at
         each meeting or pursuant to each consent of the Company's shareholders
         for the election of directors (unless the term of the director
         previously elected by the Holders pursuant to this Section 4(C) would
         continue after such election). If the director so elected by the
         Holders shall cease to serve as director before his term shall expire,
         the Holders may, at a special meeting of such Holders, elect a
         successor to hold office for the unexpired term of such director. The
         Secretary of the Company may call, and upon written request of the
         Holders of ten percent (10%) or more of the outstanding Series C
         Preferred Stock addressed to him at the principal office of the Company
         shall call, such a special meeting of the Holders for the election of
         such director as provided herein. Such meeting shall be held within
         fifty (50) days after delivery of such request to such Secretary, at
         the place and upon the notice provided by law and in the Bylaws of the
         Company for the holding of meetings of its shareholders. Any director
         who shall have been elected pursuant to this Section 4(C), may be
         removed during the aforesaid term of office, with or without cause,
         only by the affirmative



<PAGE>   9



         vote of a majority votes entitled to be cast by the Holders of Series C
         Preferred Stock, the Series B Preferred Stock and the holders of then
         outstanding Permitted Parity Securities.

                  (D) (i) The consent of the Holders of at least a majority of
         the Series C Preferred Stock, voting together with the Series B
         Preferred Stock and the Permitted Parity Securities as a single class
         with one vote per share, in person or by proxy, either in writing
         without a meeting or at an annual or a special meeting of shareholders
         called for the purpose, shall be necessary to:

                           (A) amend, alter or repeal, by way of merger or
                      otherwise, any of the provisions of the Certificate, so as
                      to authorize, create or issue any shares of Parity
                      Securities (other than Permitted Parity Securities) or
                      Senior Securities (or amend the provisions of any existing
                      class of Capital Stock to make such class of Capital Stock
                      a class of Parity Securities or Senior Securities),

                           (B) issue any Parity Securities (other than Permitted
                      Parity Securities) or Senior Securities, or

                           (C) consummate any Business Combination.

                      (ii) The consent of the Holders of at least a majority of
                  the Series C Preferred Stock, voting separately as a single
                  class with one vote per share, in person or by proxy, either
                  in writing without a meeting or at an annual or a special
                  meeting of shareholders called for the purpose, shall be
                  necessary to amend, alter or repeal, by way of merger or
                  otherwise, any of the provisions of (x) the Certificate of
                  Designation or any certificate of designation of terms of any
                  Parity Securities, or (y) the Certificate, so as to affect
                  adversely any of the rights, preferences or privileges of
                  Holders.

         5. Liquidation Preference. In the event of any Liquidation, after
payment or provision for payment by the Company of the debts and other
liabilities of the Company and the liquidation preference of any Senior
Securities that rank senior to the Series C Preferred Stock with respect to
distributions on Liquidation, each Holder shall be entitled to receive an amount
in cash for each share of the then outstanding Series C Preferred Stock held by
such Holder equal to the Stated Value per share, plus an amount equal to all
accrued but unpaid dividends thereon, whether or not earnings are available in
respect of such dividends or such dividends have been declared, to and including
the date full payment is tendered to the Holders with respect to such
Liquidation, and no more (such amount being referred to herein as the
"Liquidation Preference"), before any distribution shall be made to the holders
of any Junior Securities upon the Liquidation of the Company. In case the assets
of the Company available for payment to the Holders upon a Liquidation are
insufficient to pay the full Liquidation Preference on all outstanding shares of
the Series C Preferred Stock and all outstanding Senior Securities or Parity
Securities, in each case ranking on parity with the Series C Preferred Stock as
to distributions on Liquidation, in the amounts to which the holders of such
shares are entitled, then the entire assets of the Company available for payment
to the Holders of Series C Preferred Stock and holders of such Senior Securities
or Parity Securities will be distributed ratably



<PAGE>   10



among the Holders of the Series C Preferred Stock and the holders of such Senior
Securities or Parity Securities, based upon the aggregate amount due on such
shares upon Liquidation. Written notice of any Liquidation of the Company,
stating a payment date and the place where the distributable amounts shall be
payable, shall be given by mail, postage prepaid, not less than 30 days prior to
the payment date stated therein, to the Holders of record of the Series C
Preferred Stock at their respective addresses as the same shall appear on the
books of the Company.

         6. Conversion Rights. The Series C Preferred Stock shall be convertible
as follows:

                  (A) Conversion at Holder's Option. The Holder of any shares of
         Series C Preferred Stock shall have the right at such Holder's option,
         at any time after the Initial Conversion Date and prior to the
         Mandatory Conversion Date and without the payment of any additional
         consideration, to convert any or all of such shares of Series C
         Preferred Stock into a number of fully paid and nonassessable shares of
         Common Stock for each such share of Series C Preferred Stock equal to
         the Conversion Ratio, upon the terms hereinafter set forth.

                  (B) Mandatory Conversion. On May 7, 2004 (the "Mandatory
         Conversion Date"), each outstanding share of Series C Preferred Stock
         shall, without any action on the part of the Holder of such share, be
         converted automatically into a number of fully paid and nonassessable
         shares of Common Stock equal to the Conversion Ratio, upon the terms
         hereinafter set forth; provided, however, that if the shares of Common
         Stock issuable upon conversion of the Series C Preferred Stock are not
         immediately freely transferrable under the Securities Act by the
         Holders thereof, the Mandatory Conversion Date shall be delayed until
         such time as the resale of the Common Stock issuable upon conversion of
         such Series C Preferred Stock has been registered under the Securities
         Act in accordance with the terms of the Registration Rights Agreement.

                  (C) Conversion Ratio. In the event of a conversion pursuant to
         Section 6(A) or 6(B), the Conversion Ratio shall be a number of shares
         of Common Stock calculated using either of the following methods at the
         option of the Holder as may be specified by the Holder at the time of
         conversion, or, if no such specification is made, using the method that
         results in the highest number:

                           (i) the amount determined by dividing (a) the Stated
                  Value plus any accrued and unpaid dividends to and including
                  the applicable Conversion Date by (b) the Conversion Price in
                  effect on the applicable Conversion Date; or

                           (ii) the amount determined by dividing (a) the
                  Adjusted Stated Value as of the applicable Conversion Date by
                  (b) the Average Market Price determined as of the applicable
                  Conversion Date (but not less than the lesser of $.01 or the
                  par value per share of the Common Stock at the time of
                  conversion).




<PAGE>   11



                  (D) Mechanics of Conversion. The Holder of any shares of
         Series C Preferred Stock may exercise the conversion right specified in
         Section 6(A) by surrendering to the Company or any transfer agent of
         the Company the certificate or certificates representing the shares of
         Series C Preferred Stock to be converted, accompanied by written notice
         specifying the number of such shares to be converted. If the
         certificates representing shares of Common Stock issuable upon
         conversion of shares of Series C Preferred Stock are to be issued in a
         name other than the name on the face of the certificates representing
         such shares of Series C Preferred Stock, such certificates shall be
         accompanied by such evidence of the assignment and such evidence of the
         signatory's authority with respect thereto as deemed appropriate by the
         Company or its transfer agent. Conversion shall be deemed to have been
         effected (i) with respect to conversions pursuant to Section 6(A), on
         the date when the notice of an election to convert pursuant to Section
         6(A) and certificates representing the shares being converted are
         actually received by the Company or any transfer agent of the Company,
         or (ii) with respect to mandatory conversion pursuant to Section 6(B),
         on the Mandatory Conversion Date. Such dates that the conversion shall
         be deemed to be effective shall be referred to herein as the
         "Conversion Date." Subject to the provisions of Section 7(G), as
         promptly as practicable after the Conversion Date, the Company shall
         issue and deliver to or upon the written order of such Holder a
         certificate or certificates for the number of shares of Common Stock to
         which such Holder is entitled upon such conversion and a check or cash
         with respect to any fractional interest in a share of Common Stock, as
         provided in Section 6(E). The person in whose name the certificate or
         certificates for shares of Common Stock are to be issued shall be
         deemed to have become a holder of record of such shares of Common Stock
         on the applicable Conversion Date. Upon conversion of only a portion of
         the shares covered by a certificate representing shares of Series C
         Preferred Stock surrendered for conversion pursuant to Section 6(A),
         the Company shall issue and deliver to or upon the written order of the
         Holder of the certificate so surrendered for conversion, at the expense
         of the Company, a new certificate representing the number of shares of
         Series C Preferred Stock representing the unconverted portion of the
         certificate so surrendered.

                  (E) Fractional Shares. No fractional shares of Common Stock or
         scrip shall be issued upon conversion of shares of Series C Preferred
         Stock. If more than one share of Series C Preferred Stock shall be
         surrendered for conversion at any one time by the same Holder, the
         number of shares of Common Stock issuable upon conversion thereof shall
         be computed on the basis of the aggregate number of shares of Series C
         Preferred Stock so surrendered. Instead of any fractional share of
         Common Stock which would otherwise be issuable upon conversion of any
         shares of Series C Preferred Stock, the Company shall pay a cash
         adjustment in respect of such fractional interest in an amount equal to
         that fractional interest of the Market Price of the Common Stock on the
         Conversion Date.

                  (F) Authorization and Issuance. The Company covenants and
         agrees that:

                           (i) the shares of Common Stock issuable upon any
                  conversion of any shares of Series C Preferred Stock will be
                  deemed to have been issued to the Person exercising such
                  conversion rights set forth herein on the Conversion Date, and
                  the Person exercising such conversion rights will be deemed
                  for all purposes to have become the record holder of such
                  shares of Common Stock on the Conversion Date;



<PAGE>   12



                           (ii) all shares of Common Stock which may be issued
                  upon any conversion of any Series C Preferred Stock will, upon
                  issuance, be fully paid and non-assessable and free from all
                  taxes, liens and charges with respect to the issue thereof;

                           (iii) the Company will take all such action as may be
                  necessary to assure that all shares of Common Stock issuable
                  upon conversion of shares of Series C Preferred Stock may be
                  issued without violation of any applicable law or regulation
                  or of any requirements of any domestic securities exchange
                  upon which securities of the same class may be listed and
                  shall endeavor to list the shares of Common Stock required to
                  be delivered upon conversion of the shares of Series C
                  Preferred Stock, prior to such delivery, upon each national
                  securities exchange, if any, upon which the outstanding Common
                  Stock is listed at the time of such delivery;

                           (iv) the Company will not take any action which would
                  result in any adjustment of the Conversion Price if the total
                  number of shares of Common Stock issuable after such action
                  upon conversion of all shares of Series C Preferred Stock,
                  together with all shares of Common Stock then outstanding and
                  all shares of Common Stock then issuable upon the exercise of
                  all outstanding Common Stock Equivalents, would exceed the
                  total number of shares of Common Stock then authorized by the
                  Certificate of Incorporation;

                           (v) the Company will at all times reserve and keep
                  available, out of its authorized but unissued shares of Common
                  Stock or out of shares of Common Stock held in its treasury,
                  the full number of shares of Common Stock into which all
                  shares of the Series C Preferred Stock having conversion
                  privileges from time to time outstanding are convertible; and

                           (vi) the Company will at no time close its transfer
                  books against the transfer of the Series C Preferred Stock or
                  of any share of Common Stock issued or issuable upon the
                  conversion of the Series C Preferred Stock in any manner which
                  interferes with the timely conversion of the Series C
                  Preferred Stock.

                  (G) Rights. Whenever the Company issues shares of Common Stock
         upon conversion of Series C Preferred Stock, the Company will issue,
         together with each such share of Common Stock, one right to purchase
         Series A Preferred Stock of the Company (or other securities in lieu
         thereof) pursuant to the Rights Agreement dated as of January 17, 1997
         by and between the Company and Harris Trust and Savings Bank, as
         amended (the "Rights Agreement"), or any similar rights, if any, issued
         to holders of Common Stock in addition thereto or in the replacement
         therefor (such rights, together with any additional or replacement
         rights, being collectively referred to as the "Rights"), whether or not
         such rights shall be exercisable at such time, but only if such Rights
         are issued and outstanding and held by other holders of Common Stock
         (or are evidenced by outstanding share certificates representing Common
         Stock) at such time and have not expired or been redeemed.


<PAGE>   13


                  (H) Cash Redemption Option. Notwithstanding the provisions of
         Sections 6(A) or 6(B), in the event of a conversion of Series C
         Preferred Stock pursuant to which the Conversion Ratio is determined
         using Section 6(C)(ii) (rather than Section 6(C)(i)), then, provided
         that full cumulative dividends shall have been paid or declared and set
         apart for payment upon all outstanding shares of Series C Preferred
         Stock for all past dividend periods, the Company may offer to redeem
         for cash any or all of such shares of Series C Preferred Stock at a
         redemption price per share equal to the Adjusted Stated Value (a
         "Redemption Offer"), in lieu of effecting such conversion. To effect a
         Redemption Offer, the Company must give notice of such election,
         specifying the redemption price, (a "Redemption Offer Notice") to the
         Holder of such shares of Series C Preferred Stock (i) with respect to
         conversions pursuant to Section 6(A), within three Business Days after
         the notice of an election to convert pursuant to Section 6(A) is
         received by the Company or any transfer agent of the Company, or (ii)
         with respect to mandatory conversion pursuant to Section 6(B), on the
         Mandatory Conversion Date. If the Company fails to give a Redemption
         Offer Notice within the foregoing time periods, it may not make a
         Redemption Offer. If the Company has given a Redemption Offer Notice
         with respect to more than 50% of the shares of Series C Preferred Stock
         to be converted, then within three Business Days following receipt of a
         Redemption Offer Notice, the Holder may give notice to the Company
         declining the Company's offer to redeem up to 50% of the shares of
         Series C Preferred Stock to be converted, in which event the Company
         will not be entitled to redeem such shares as specified and must
         convert such shares into Common Stock in accordance with the terms
         hereof effective as of the Conversion Date. The Company shall be
         entitled to redeem all of the shares subject to the Redemption Offer
         Notice at the redemption price set forth above to the extent the Holder
         does not properly decline such redemption in accordance with the prior
         sentence. The Company shall make any such redemption payment by wire
         transfer to an account specified by the Holder on the first Business
         Day following the expiration of the three Business Day period after the
         Holder's receipt of the Redemption Offer Notice, failing which payment
         the Company shall not be entitled to redeem such shares but shall be
         obligated to convert all of such Shares into Common Stock in accordance
         with the terms hereof.

                  (I) Limitation on Number of Conversion Shares. Notwithstanding
         the provisions of Sections 6(A) or 6(B), if the Company ever issues
         Common Stock upon conversion of Series C Preferred Stock pursuant to
         which the Conversion Ratio is calculated pursuant to Section 6(C)(ii)
         rather than Section 6(C)(i), the Company shall not be obligated to
         issue, in the aggregate, a number of shares of Common Stock in excess
         of the NYSE Limitation upon conversion of the Series C Preferred Stock.
         The "NYSE Limitation" shall mean the maximum number of shares of Common
         Stock that could be issued by the Company pursuant to the conversion of
         the Series B Preferred Stock, the Series C Preferred Stock and any
         substantially similar series of Permitted Parity Securities issued to
         the Holder pursuant to the terms of the Purchase Agreement without
         triggering a requirement to obtain the approval of the Company's
         shareholders of such issuance pursuant to Section 312.03(c) of the New
         York Stock Exchange Listed Company Manual as in effect on the Issue
         Date. To the extent that any shares of Series C Preferred Stock are
         submitted for conversion such that the NYSE Limitation would be
         exceeded, such excess shares shall, in lieu of being converted into
         Common Stock, be redeemed in exchange for a cash payment equal to the
         Adjusted



<PAGE>   14



         Stated Value per share. The Company shall make any such redemption
         payment by wire transfer to an account specified by the Holder on the
         second Business Day following the Conversion Date on which the shares
         of Series C Preferred Stock would otherwise be converted into Common
         Stock.

         7. Conversion Price Adjustments. The Conversion Price shall be subject
to adjustment from time to time as follows:

                  (A) Common Stock Issued at Less than Market Price or
         Conversion Price. If the Company issues or sells any Common Stock other
         than Excluded Stock without consideration or for a consideration per
         share less than the Market Price per share of Common Stock, on the
         Trading Day immediately preceding such issuance or sale or less than
         the Conversion Price in effect immediately prior to such issuance or
         sale, the Conversion Price in effect immediately prior to each such
         issuance or sale will immediately (except as provided below) be reduced
         to the price determined by multiplying the Conversion Price in effect
         immediately prior to such issuance or sale, by a fraction, (1) the
         numerator of which shall be (i) the number of shares of Common Stock
         outstanding immediately prior to such issuance or sale plus (ii) the
         number of shares of Common Stock which the aggregate consideration
         received by the Company for the total number of such additional shares
         of Common Stock so issued or sold would purchase at the higher of (x)
         the Market Price per share of Common Stock on the Trading Day
         immediately preceding such issuance or sale and (y) the Conversion
         Price in effect immediately prior to such issuance or sale and (2) the
         denominator of which shall be the number of shares of Common Stock
         outstanding immediately after such issue or sale. For the purposes of
         any adjustment of the Conversion Price pursuant to this Section 7(A),
         the following provisions shall be applicable:

                           (i) in the case of the issuance of Common Stock for
                  cash, the amount of the consideration received by the Company
                  shall be deemed to be the amount of the cash proceeds received
                  by the Company for such Common Stock before deducting
                  therefrom any discounts or commissions allowed, paid or
                  incurred by the Company for any underwriting or otherwise in
                  connection with the issuance and sale thereof;

                           (ii) in the case of the issuance of Common Stock
                  (otherwise than upon the conversion of shares of Capital Stock
                  or other securities of the Company) for a consideration in
                  whole or in part other than cash, including securities
                  acquired in exchange therefor (other than securities by their
                  terms so exchangeable), the consideration other than cash
                  shall be deemed to be the fair value thereof as reasonably
                  determined by the Board, irrespective of any accounting
                  treatment; provided, however, that such fair value as
                  determined by the Board shall not exceed the aggregate Market
                  Price of the shares of Common Stock being issued as of the
                  date the Board authorizes the issuance of such shares;



<PAGE>   15



                           (iii) in the case of the issuance of (a) options,
                  warrants or other rights to purchase or acquire Common Stock
                  (whether or not at the time exercisable), (b) securities by
                  their terms convertible into or exchangeable for Common Stock
                  (whether or not at the time so convertible or exchangeable) or
                  options, warrants or rights to purchase such convertible or
                  exchangeable securities (whether or not at the time
                  exercisable):

                                 (1) aggregate maximum number of shares of
                                     Common Stock deliverable upon exercise of
                                     such options, warrants or other rights to
                                     purchase or acquire Common Stock shall be
                                     deemed to have been issued at the time such
                                     options, warrants or rights are issued and
                                     for a consideration equal to the
                                     consideration (determined in the manner
                                     provided in Section 7(A)(i) and (ii)), if
                                     any, received by the Company upon the
                                     issuance of such options, warrants or
                                     rights plus the minimum purchase price
                                     provided in such options, warrants or
                                     rights for the Common Stock covered
                                     thereby;

                                 (2) the aggregate maximum number of shares of
                                     Common Stock deliverable upon conversion of
                                     or in exchange for any such convertible or
                                     exchangeable securities, or upon the
                                     exercise of options, warrants or other
                                     rights to purchase or acquire such
                                     convertible or exchangeable securities and
                                     the subsequent conversion or exchange
                                     thereof, shall be deemed to have been
                                     issued at the time such securities were
                                     issued or such options, warrants or rights
                                     were issued and for a consideration equal
                                     to the consideration, if any, received by
                                     the Company for any such securities and
                                     related options, warrants or rights
                                     (excluding any cash received on account of
                                     accrued interest or accrued dividends),
                                     plus the additional consideration
                                     (determined in the manner provided in
                                     Section 7(A)(i) and (ii)), if any, to be
                                     received by the Company upon the conversion
                                     or exchange of such securities, or upon the
                                     exercise of any related options, warrants
                                     or rights to purchase or acquire such
                                     convertible or exchangeable securities and
                                     the subsequent conversion or exchange
                                     thereof;

                                 (3) on any change in the number of shares of
                                     Common Stock deliverable upon exercise of
                                     any such options, warrants or rights or
                                     conversion or exchange of such convertible
                                     or exchangeable securities or any change in
                                     the consideration to be received by the
                                     Company upon such exercise, conversion or
                                     exchange, but excluding changes resulting
                                     from the anti-dilution provisions thereof
                                     (to the extent comparable to the
                                     anti-dilution provisions contained herein),
                                     the Conversion Price as then in effect
                                     shall forthwith be readjusted to such


<PAGE>   16



                                     Conversion Price as would have been
                                     obtained had an adjustment been made upon
                                     the issuance of such options, warrants or
                                     rights not exercised prior to such change,
                                     or of such convertible or exchangeable
                                     securities not converted or exchanged prior
                                     to such change, upon the basis of such
                                     change;

                                 (4) on the expiration or cancellation of any
                                     such options, warrants or rights (without
                                     exercise), or the termination of the right
                                     to convert or exchange such convertible or
                                     exchangeable securities (without exercise),
                                     if the Conversion Price shall have been
                                     adjusted upon the issuance thereof, the
                                     Conversion Price shall forthwith be
                                     readjusted to such Conversion Price as
                                     would have been obtained had an adjustment
                                     been made upon the issuance of such
                                     options, warrants, rights or such
                                     convertible or exchangeable securities on
                                     the basis of the issuance of only the
                                     number of shares of Common Stock actually
                                     issued upon the exercise of such options,
                                     warrants or rights, or upon the conversion
                                     or exchange of such convertible or
                                     exchangeable securities; and

                                 (5) if the Conversion Price shall have been
                                     adjusted upon the issuance of any such
                                     options, warrants, rights or convertible or
                                     exchangeable securities, no further
                                     adjustment of the Conversion Price shall be
                                     made for the actual issuance of Common
                                     Stock upon the exercise, conversion or
                                     exchange thereof;

                  provided, however, that no increase in the Conversion Price
                  shall be made pursuant to subclauses (1) or (2) of this
                  Section 7(A)(iii).

                  (B) Stock Splits, Subdivisions, Reclassifications or
         Combinations. If the Company shall (1) declare a dividend or make a
         distribution on its Common Stock in shares of Common Stock, (2)
         subdivide or reclassify the outstanding shares of Common Stock into a
         greater number of shares, or (3) combine or reclassify the outstanding
         Common Stock into a smaller number of shares, the Conversion Price in
         effect at the time of the record date for such dividend or distribution
         or the effective date of such subdivision, combination or
         reclassification shall be proportionately adjusted so that the Holder
         of any shares of Series C Preferred Stock surrendered for conversion or
         exchange after such date shall be entitled to receive the number of
         shares of Common Stock which such holder would have owned or been
         entitled to receive after such date had such Series C Preferred Stock
         been converted or exchanged immediately prior to such date. Successive
         adjustments in the Conversion Price shall be made whenever any event
         specified above shall occur.


<PAGE>   17


                  (C) Other Distributions. In case the Company shall fix a
         record date for the making of a distribution to all holders of shares
         of its Common Stock (1) of shares of any class other than its Common
         Stock or (2) of evidence of indebtedness of the Company or any
         Subsidiary or (3) of assets (including cash but excluding Ordinary Cash
         Dividends, and dividends or distributions referred to in Section 7(B)),
         or (4) of rights or warrants, then in each such case the Conversion
         Price in effect immediately prior thereto shall be reduced to the price
         determined by multiplying the Conversion Price in effect immediately
         prior to such record date by a fraction, (i) the numerator of which
         shall be an amount equal to the difference resulting from (A) the
         number of shares of Common Stock outstanding on such record date
         multiplied by the Market Price per share of Common Stock on such record
         date, less (B) the fair market value (as reasonably determined by the
         Board) of said shares or evidences of indebtedness or assets or rights
         or warrants to be so distributed, and (ii) the denominator of which
         shall be equal to the number of shares of Common Stock outstanding on
         such record date multiplied by the Market Price per share of Common
         Stock on such record date. Such adjustment shall be made successively
         whenever such a record date is fixed. In the event that such
         distribution is not so made, the Conversion Price then in effect shall
         be readjusted, effective as of the date when the Board determines not
         to distribute such shares, evidences of indebtedness, assets, rights or
         warrants, as the case may be, to the Conversion Price that would then
         be in effect if such record date had not been fixed.

                  (D) Certain Repurchases of Common Stock. In case the Company
         effects a Pro Rata Repurchase of Common Stock, then the Conversion
         Price shall be reduced to the price determined by multiplying the
         Conversion Price in effect immediately prior to the effective date of
         such Pro Rata Repurchase by a fraction of which (1) the numerator shall
         be (i) the product of (x) the number of shares of Common Stock
         outstanding immediately before such Pro Rata Repurchase and (y) the
         Market Price per share of Common Stock on the Trading Day immediately
         preceding the first public announcement of the intent to effect such
         Pro Rata Repurchase, minus (ii) the aggregate purchase price of the Pro
         Rata Repurchase, and of which (2) the denominator shall be the product
         of (a) the number of shares of Common Stock outstanding immediately
         prior to such Pro Rata Repurchase minus the number of shares of Common
         Stock so repurchased and (b) the Market Price per share of Common Stock
         on the Trading Day immediately preceding the first public announcement
         of such Pro Rata Repurchase.

                  (E) Business Combinations. In case of any Business Combination
         in which the holders of shares of Common Stock are entitled to receive
         stock, securities or property by virtue of their ownership of Common
         Stock or a reclassification of Common Stock (other than a
         reclassification of Common Stock referred to in Section 7(B)), each
         share of Series C Preferred Stock shall after the date of such Business
         Combination or reclassification be convertible into the number of
         shares of stock or other securities or property (including cash) to
         which the Common Stock issuable upon conversion of such share of Series
         C Preferred Stock immediately prior to such Business Combination or
         reclassification would have been entitled upon such Business
         Combination or reclassification; and in any such case, if necessary,
         the provisions set forth herein with respect to the rights and
         interests thereafter of the Holders of the shares of Series C Preferred
         Stock shall be appropriately adjusted so as to be applicable, as nearly
         as may reasonably be, to any shares of stock or other securities or


<PAGE>   18



         property thereafter deliverable on the conversion of the shares of
         Series C Preferred Stock. In determining the kind and amount of stock,
         securities or the property receivable upon consummation of such
         Business Combination, if the holders of Common Stock have the right to
         elect the kind or amount of consideration receivable upon consummation
         of such Business Combination, then the Holder of the Series C Preferred
         Stock shall have the right to make a similar election as of the
         Conversion Date with respect to the number of shares of stock or other
         securities or property into which the Series C Preferred Stock shall be
         convertible.

                  (F) Rounding of Calculations; Minimum Adjustments. All
         calculations under this Section 7 shall be made to the nearest one
         tenth (1/10th) of a cent or to the nearest one hundredth (1/100th) of a
         share, as the case may be. Any provision of this Section 7 to the
         contrary notwithstanding, no adjustment in the Conversion Price shall
         be made if the amount of such adjustment would be less than $0.01, but
         any such amount shall be carried forward and an adjustment with respect
         thereto shall be made at the time of and together with any subsequent
         adjustment which, together with such amount and any other amount or
         amounts so carried forward, shall aggregate $0.01 or more. In addition,
         in no event shall be Conversion Price be adjusted to less than the
         lesser of $.01 per share or the par value of the Common Stock.

                  (G) Timing of Issuance of Additional Common Stock Upon Certain
         Adjustments. In any case in which the provisions of this Section 7
         shall require that an adjustment shall become effective immediately
         after a record date for an event, the Company may defer until the
         occurrence of such event (1) issuing to the Holder of any share of
         Series C Preferred Stock converted after such record date and before
         the occurrence of such event the additional shares of Common Stock
         issuable upon such conversion by reason of the adjustment required by
         such event over and above the shares of Common Stock issuable upon such
         conversion before giving effect to such adjustment and (B) paying to
         such Holder any amount of cash in lieu of a fractional share of such
         Common Stock; provided, however, that the Company upon request shall
         deliver to such Holder a due bill or other appropriate instrument
         evidencing such Holder's right to receive such additional shares, and
         such cash, upon the occurrence of the event requiring such adjustment.

                  (H) Statement Regarding Adjustments. Whenever the Conversion
         Price shall be adjusted as provided in Section 7 the Company shall
         forthwith file, at the office of any transfer agent for the Series C
         Preferred Stock and at the principal office of the Company a statement
         showing in reasonable detail the facts requiring such adjustment and
         the Conversion Price that shall be in effect after such adjustment and
         the Company shall also cause a copy of such statement to be sent by
         mail, first class postage prepaid, to each Holder at its address
         appearing in the Company's records.

                  (I) Notices. In the event that the Company shall propose to
         take any action of the type described in Section 7 (but only if the
         action of the type described in Section 7 would result in an adjustment
         in the Conversion Price or a change in the type of securities or
         property to be delivered upon a conversion or exchange of Series C
         Preferred Stock), the Company shall give notice to each Holder, in the
         manner set forth in Section 7(H), which



<PAGE>   19



         notice shall specify the record date, if any, with respect to any such
         action and the approximate date on which such action is to take place.
         Such notice shall also set forth the facts with respect thereto as
         shall be reasonably necessary to indicate the effect on the Conversion
         Price and the number, kind or class of shares or other securities or
         property which shall be deliverable upon conversion of shares of the
         Series C Preferred Stock. In the case of any action which would require
         the fixing or a record date, such notice shall be given at least 10
         days prior to the date so fixed, and in case of all other action, such
         notice shall be given at least 15 days prior to the taking of such
         proposed action. Failure to give such notice, or any defect therein,
         shall not affect the legality or validity of any such action.

                  (J) No Impairment. The Company will not, by amendment of its
         Certificate of Incorporation or through any reorganization, transfer of
         assets, consolidation, merger, dissolution, issue or sale of securities
         or any other voluntary action, avoid or seek to avoid the observance or
         performance of any of the terms to be observed or performed hereunder
         by the Company, but will at all times in good faith assist in the
         carrying out of all the provisions of Sections 6 and 7 and in taking of
         all such action as may be necessary or appropriate in order to protect
         the conversion rights of the Holders of the Series C Preferred Stock
         against impairment.

                  (K) No Duplication of Adjustments. If any action would require
         adjustment of the Conversion Price pursuant to more than one of the
         provisions of this Section 7, only one adjustment shall be made and
         such adjustment shall be the adjustment that results in the lowest
         Conversion Price after giving effect to such adjustment.

         8. Limitations on Series C Preferred Stock. No share or shares of
Series C Preferred Stock the Company acquires through redemption, option,
exchange or otherwise will be reissued as Series C Preferred Stock, and all such
shares will be canceled, retired and eliminated from the shares of Series C
Preferred Stock which the Company will be authorized to issue, and will be
restored to the status of authorized but undesignated preferred stock of the
Company eligible for designation and reissuance subject to the terms hereof and
the Certificate. The Company will not issue any further shares of Series C
Preferred Stock.

         9. Waivers. With the written consent of Holders of a Majority of the
Series C Preferred Stock, the obligations of the Company and the rights of the
Holders under this Certificate of Designation may be waived (either generally or
in a particular instance, either retroactively or prospectively and either for a
specified period of time or indefinitely). Upon the effectuation of each such
waiver, the Company will promptly give written notice thereof to the Holders who
have not previously consented thereto in writing.

         10. Redemption. Except as expressly set forth herein, the Company shall
have no right or obligation to redeem the Series C Preferred Stock.


                   REMAINDER OF PAGE INTENTIONALLY LEFT BLANK.



<PAGE>   20




         IN WITNESS WHEREOF, this Certificate has been signed on behalf of the
Company by its President and attested to by its Secretary, all as of the 16th
day of August, 1999.

                                         INPUT/OUTPUT, INC.


                                         By: /s/ Robert P. Brindley
                                             ----------------------------------
                                                 Robert P. Brindley
                                                 Executive Vice President
                                                  and Secretary

ATTEST:


By: /s/ Roy Kelm
    ------------------------------------------
         Roy Kelm
         Vice President, Marine Division






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