OCTEL COMMUNICATIONS CORP
8-A12G/A, 1996-08-30
TELEPHONE & TELEGRAPH APPARATUS
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 8-A/A

                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                     PURSUANT TO SECTION 12(b) OR (g) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                        OCTEL COMMUNICATIONS CORPORATION
- -------------------------------------------------------------------------------
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

               DELAWARE                                77-0029449
- ------------------------------------------ ------------------------------------
         (STATE OF INCORPORATION                    (I.R.S. EMPLOYER
             OR ORGANIZATION                        IDENTIFICATION NO.)

                   1001 MURPHY RANCH ROAD, MILPITAS, CA 95035
- -------------------------------------------------------------------------------
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)

         If this Form relates to the registration of a class of debt securities
and is effective upon filing pursuant to General Instruction A.(c)(1), please
check the following box. / /

         If this Form relates to the registration of a class of debt securities
and is to become effective simultaneously with the effectiveness of a concurrent
registration statement under the Securities Act of 1933 pursuant to General
Instruction A.(c)(2), please check the following box. / /

         Securities to be registered pursuant to Section 12(b) of the Act:



           TITLE OF EACH CLASS               NAME OF EACH EXCHANGE ON WHICH
           TO BE SO REGISTERED               EACH CLASS IS TO BE REGISTERED
- ------------------------------------------ ------------------------------------
               NONE                                     NONE

         Securities to be registered pursuant to Section 12(g) of the Act:

                          COMMON SHARE PURCHASE RIGHTS
- -------------------------------------------------------------------------------
                                (TITLE OF CLASS)

- -------------------------------------------------------------------------------
                                (TITLE OF CLASS)
<PAGE>   2
Item 1.           DESCRIPTION OF SECURITIES TO BE REGISTERED.

         On August 1, 1990, Octel Communications Corporation (the "Company")
filed a Registration Statement on Form 8-A with the Securities Exchange
Commission (the "Commission") in order to register common share purchase rights
issuable in accordance with the terms of the Common Shares Rights Agreement (the
"Prior Rights Agreement") between the Company and Bank of America NT & SA, as
rights agent.

         On August 29, 1996, the the Company and The First National Bank of
Boston, as successor rights agent, entered into the Amended and Restated Common
Shares Rights Agreement (the "Amended Rights Agreement"), which supersedes the
Prior Rights Agreement as originally executed. The Amended Rights Agreement is
substantially the same as the Prior Rights Agreement as originally executed,
with the exception that, among other things (i) the exercise price of each Right
has been changed to $100.00, (ii) the Redemption Price of each Right has been
changed to $.001 per share and (iii) the term of the Amended Rights Agreement
has been extended to August 29, 2006.

         In all other respects, the disclosure concerning the Rights and the
Rights Agreement as set forth in the Registration Statement is unchanged.

         The summary of the Amended Rights Agreement contained herein or in the
Registration Statement as originally filed is qualified in its entirety by
reference to the Amended Rights Agreement.

Item 2.           EXHIBITS.

                  1.       Amended and Restated Common Shares Rights Agreement,
                           dated as of August 29, 1996 between Octel
                           Communications Corporation and The First National
                           Bank of Boston, including the form of Rights
                           Certificate and the Summary of Rights attached
                           thereto as Exhibits A and B, respectively.

                                       -2-
<PAGE>   3
         Pursuant to the requirements of Section 12 of the Securities Exchange
Act of 1934 the Registrant has duly caused this amendment to be signed on its
behalf by the undersigned, thereunto duly authorized.


Date:  August 29, 1996                      OCTEL COMMUNICATIONS CORPORATION


                           By:  /s/ Derek S. Daley
                              --------------------------------

                           Title: Vice President, General Counsel and Secretary
                                  ---------------------------------------------

                                       -3-
<PAGE>   4
                                  EXHIBIT INDEX

   EXHIBIT                            
     NO.                              EXHIBIT
- --------------- ---------------------------------------------------------------
     1               Amended and Restated Common Shares Rights
                     Agreement dated as of August 29, 1996 between
                     Octel Communications Corporation and The First
                     National Bank of Boston including the form of Rights
                     Certificate and the Summary of Rights attached
                     thereto as Exhibits A and B, respectively.

                                       -4-

<PAGE>   1
                        OCTEL COMMUNICATIONS CORPORATION

                                      AND

                       THE FIRST NATIONAL BANK OF BOSTON

                                  RIGHTS AGENT



                           FIRST AMENDED AND RESTATED

                         COMMON SHARES RIGHTS AGREEMENT


                          DATED AS OF AUGUST 29, 1996
<PAGE>   2
                                TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                                                                    Page

<S>                                                                                                                 <C>
Section 1.  Certain Definitions.....................................................................................-1-

Section 2.  Appointment of Rights Agent.............................................................................-5-

Section 3.  Issuance of Rights Certificates.........................................................................-5-

Section 4.  Form of Rights Certificates.............................................................................-7-

Section 5.  Countersignature and Registration.......................................................................-8-

Section 6.  Transfer, Split Up, Combination and Exchange of Rights Certificates; Mutilated,
                Destroyed, Lost or Stolen Rights Certificates.......................................................-8-

Section 7.  Exercise of Rights; Purchase Price; Expiration Date of Rights...........................................-9-

Section 8.  Cancellation and Destruction of Rights Certificates....................................................-11-

Section 9.  Reservation and Availability of Common Shares..........................................................-11-

Section 10.  Common Shares Record Date.............................................................................-12-

Section 11.  Adjustment of Purchase Price, Number of Shares or Number of Rights....................................-13-

Section 12.  Certificate of Adjusted Purchase Price or Number of Shares............................................-19-

Section 13.  Consolidation, Merger or Sale or Transfer of Assets or Earning Power..................................-19-

Section 14.  Fractional Rights and Fractional Shares...............................................................-22-

Section 15.  Rights of Action......................................................................................-23-

Section 16.  Agreement of Rights Holders...........................................................................-23-

Section 17.  Rights Certificate Holder Not Deemed a Stockholder....................................................-23-

Section 18.  Concerning the Rights Agent...........................................................................-24-

Section 19.  Merger or Consolidation or Change of Name of Rights Agent.............................................-24-

Section 20.  Duties of Rights Agent................................................................................-25-

Section 21.  Change of Rights Agent................................................................................-27-
</TABLE>

<PAGE>   3
                                TABLE OF CONTENTS
                                   (continued)
<TABLE>
<CAPTION>
                                                                                                                   Page

<S>                                                                                                                <C>
Section 22.  Issuance of New Rights Certificates...................................................................-27-

Section 23.  Redemption............................................................................................-28-

Section 24.  Exchange..............................................................................................-29-

Section 25.  Notice of Certain Events..............................................................................-31-

Section 26.  Notices...............................................................................................-32-

Section 27.  Supplements and Amendments............................................................................-32-

Section 28.  Successors............................................................................................-33-

Section 29.  Determinations and Actions by the Board of Directors, etc.............................................-33-

Section 30.  Benefits of this Agreement............................................................................-33-

Section 31.  Severability..........................................................................................-33-

Section 32.  Governing Law.........................................................................................-34-

Section 33.  Counterparts..........................................................................................-34-

Section 34.  Descriptive Headings..................................................................................-34-


EXHIBITS

Exhibit A           Form of Rights Certificates

Exhibit B          Summary of Rights
</TABLE>

                                      -ii-


<PAGE>   4
                         COMMON SHARES RIGHTS AGREEMENT


         This First Amended and Restated Common Shares Rights Agreement
("AGREEMENT") between Octel Communications Corporation, a Delaware corporation
(the "COMPANY"), and The First National Bank of Boston (the "RIGHTS AGENT") is
dated and effective as of August 29, 1996.

         WHEREAS, the Company and the Rights Agent are parties to that certain
Rights Agreement dated as of July 25, 1990 (the "PRIOR AGREEMENT");

         WHEREAS, on July 25, 1990 (the "RIGHTS DIVIDEND DECLARATION DATE"), the
Board of Directors of the Company authorized and declared a dividend of one
Common Share Purchase Right (a "RIGHT") for each Common Share (as hereinafter
defined) of the Company outstanding as of the Close of Business (as hereinafter
defined) on August 15, 1990 (the "RECORD DATE"), each Right representing the
right to purchase one Common Share (as such number may be adjusted pursuant to
the provisions of this Agreement) upon the terms and subject to the conditions
herein set forth, and further authorized and directed the issuance of one Right
(as such number may be adjusted pursuant to the provisions of this Agreement)
with respect to each Common Share that shall become outstanding between the
Record Date and the earlier of the Distribution Date and the Expiration Date (as
such terms are hereinafter defined), and in certain circumstances after the
Distribution Date.

         WHEREAS, the Company has determined that, pursuant to Section 27 of the
Prior Agreement, the Prior Agreement may be amended and restated as set forth
herein without the approval of the holders of the Rights (as hereinafter
defined);

         NOW, THEREFORE, in consideration of the promises and the mutual
agreements herein set forth, the parties hereby agree as follows:

         Section 1. CERTAIN DEFINITIONS. For purposes of this Agreement, the
following terms have the meanings indicated:

         (a)      "ACQUIRING PERSON" shall mean any Person who or which,
together with all Affiliates and Associates of such Person, shall be the
Beneficial Owner of 21% or more of the Common Shares then outstanding, but shall
not include the Company, any Subsidiary of the Company or any employee benefit
plan of the Company or of any Subsidiary of the Company, or any entity holding
Common Shares for or pursuant to the terms of any such plan. Notwithstanding the
foregoing, no Person shall be deemed to be an "Acquiring Person" either (i) as
the result of an acquisition of Common Shares by the Company which, by reducing
the number of shares outstanding, increases the proportionate number of shares
beneficially owned by such Person to 21% or more of the Common Shares of the
Company then outstanding; provided, however, that if a Person shall become the
Beneficial Owner of 21% or more of the Common Shares of the Company then
outstanding by reason of share purchases by the Company and shall, after such
share purchases by the Company, become the Beneficial Owner of any additional
Common Shares of the Company, then such Person shall be deemed to be an
"Acquiring Person," or (ii) if the Board of Directors of the
<PAGE>   5
Company determines in good faith that a Person who would otherwise be an
"Acquiring Person," as defined pursuant to the foregoing provisions of this
paragraph (a), has become such inadvertently, and such Person divests as
promptly as practicable a sufficient number of Common Shares so that such Person
would no longer be an "Acquiring Person," as defined pursuant to the foregoing
provisions of this paragraph (a).

         (b)      "AFFILIATE" and "ASSOCIATE" shall have the respective meanings
ascribed to such terms in Rule 12b-2 of the General Rules and Regulations under
the Securities Exchange Act of 1934, as amended (the "Exchange Act"), as in
effect on the date of this Agreement.

         (c)      A Person shall be deemed the "BENEFICIAL OWNER" of and shall
be deemed to "beneficially own" any securities:

                  (i)      which such Person or any of such Person's Affiliates
or Associates beneficially owns, directly or indirectly, for purposes of Section
13(d) of the Exchange Act and Rule 13d-3 thereunder (or any comparable or
successor law or regulation);

                  (ii)     which such Person or any of such Person's Affiliates
or Associates has (A) the right to acquire (whether such right is exercisable
immediately or only after the passage of time) pursuant to any agreement,
arrangement or understanding (other than customary agreements with and between
underwriters and selling group members with respect to a bona fide public
offering of securities), or upon the exercise of conversion rights, exchange
rights, rights (other than the Rights), warrants or options, or otherwise;
provided, however, that a Person shall not be deemed pursuant to this Section
1(c)(ii)(A) the Beneficial Owner of, or to beneficially own, (1) securities
tendered pursuant to a tender or exchange offer made by or on behalf of such
Person or any of such Person's Affiliates or Associates until such tendered
securities are accepted for purchase or exchange, or (2) securities which a
Person or any of such Person's Affiliates or Associates may be deemed to have
the right to acquire pursuant to any merger or other acquisition agreement
between the Company and such Person (or one or more of its Affiliates or
Associates) if such agreement has been approved by a majority of the Continuing
Directors of the Company at a time when Continuing Directors are in office and
prior to there being an Acquiring Person; or (B) the right to vote pursuant to
any agreement, arrangement or understanding; provided, however, that a Person
shall not be deemed the Beneficial Owner of, or to beneficially own, any
security under this Section 1(c)(ii)(B) if the agreement, arrangement or
understanding to vote such security (1) arises solely from a revocable proxy or
consent given to such Person in response to a public proxy or consent
solicitation made pursuant to, and in accordance with, the applicable rules and
regulations of the Exchange Act and (2) is not also then reportable on Schedule
13D under the Exchange Act (or any comparable or successor report); or

                  (iii)    which are beneficially owned, directly or indirectly,
by any other Person (or any Affiliate or Associate thereof) with which such
Person or any of such Person's Affiliates or Associates has any agreement,
arrangement or understanding (whether or not in writing) (other than customary
agreements with and between underwriters and selling group members with respect
to a

                                       -2-
<PAGE>   6
bona fide public offering of securities) for the purpose of acquiring, holding,
voting (except to the extent contemplated by the proviso to Section 1(c)(ii)(B))
or disposing of any securities of the Company; provided, however, that in no
case shall an officer or director of the Company be deemed (x) the Beneficial
Owner of any securities beneficially owned by another officer or director of the
Company solely by reason of actions undertaken by such persons in their capacity
as officers or directors of the Company or (y) the Beneficial Owner of
securities held of record by the trustee of any employee benefit plan of the
Company or any Subsidiary of the Company for the benefit of any employee of the
Company or any Subsidiary of the Company, other than the officer or director, by
reason of any influence that such officer or director may have over the voting
of the securities held in the plan.

         (d)      "BUSINESS DAY" shall mean any day other than a Saturday,
Sunday or a day on which banking institutions in California are authorized or
obligated by law or executive order to close.

         (e)      "CLOSE OF BUSINESS" on any given date shall mean 5:00 p.m.,
New York time, on such date; provided, however, that if such date is not a
Business Day it shall mean 5:00 p.m., New York time, on the next succeeding
Business Day.

         (f)      "COMMON SHARES," when used with reference to the Company,
shall mean the shares of Common Stock of the Company, $.001 par value. "Common
Shares" when used with reference to any Person other than the Company shall mean
the capital stock (or equity interest) with the greatest voting power of such
other Person or, if such other Person is a Subsidiary of another Person, the
Person or Persons which ultimately control such first-mentioned Person.

         (g)      "CONTINUING DIRECTOR" shall mean (i) any member of the Board
of Directors of the Company, while a member of the Board, who is not an
Acquiring Person, or an Affiliate or Associate of an Acquiring Person, or a
representative of an Acquiring Person or of any such Affiliate or Associate, and
who was a member of the Board prior to the date of this Agreement, or (ii) any
Person who subsequently becomes a member of the Board, while a member of the
Board, who is not an Acquiring Person, or an Affiliate or Associate of an
Acquiring Person, or a representative of an Acquiring Person or of any such
Affiliate or Associate, if such Person's nomination for election or election to
the Board is recommended or approved by a majority of the Continuing Directors.

         (h)      "DISTRIBUTION DATE" shall mean the earlier of (i) the Close of
Business on the tenth day (or such later date as may be determined by action of
a majority of Continuing Directors then in office) after the Shares Acquisition
Date (or, if the tenth day after the Shares Acquisition Date occurs before the
Record Date, the Close of Business on the Record Date) or (ii) the Close of
Business on the tenth day (or such later date as may be determined by action of
a majority of Continuing Directors then in office) after the date that a tender
or exchange offer by any Person (other than the Company, any Subsidiary of the
Company, any employee benefit plan of the Company or of any Subsidiary of the
Company, or any Person or entity organized, appointed or established by the
Company for or pursuant to the terms of any such plan) is first published or
sent or given within the meaning of Rule 14d-2(a) of the General Rules and
Regulations under the Exchange Act, if,

                                       -3-
<PAGE>   7
assuming the successful consummation thereof, such Person would be the
Beneficial Owner of 21% or more of the shares of Common Stock then outstanding.

         (i)      "EQUIVALENT SHARES" shall mean preferred shares and any other
class or series of capital stock of the Company which is entitled to participate
in dividends and other distributions, including distributions upon the
liquidation, dissolution or winding up of the Company, on a proportional basis
with the Common Shares. In calculating the number of any class or series of
Equivalent Shares for purposes of Section 11 of this Agreement, the number of
shares, or fractions of a share, of such class or series of capital stock that
is entitled to the same dividend or distribution as a whole Common Share shall
be deemed to be one share.

         (j)      "EXPIRATION DATE" shall mean the earliest of (i) the Close of
Business on the Final Expiration Date, (ii) the Redemption Date, (iii) the time
at which the Continuing Directors order the exchange of the Rights as provided
in Section 24 hereof or (iv) the consummation of a transaction contemplated by
Section 13(d) hereof.

         (k)      "FINAL EXPIRATION DATE" shall mean August 29, 2006.

         (l)      "PERMITTED OFFER" shall mean a tender offer for all
outstanding Common Shares made in the manner prescribed by Section 14(d) of the
Exchange Act and the rules and regulations promulgated thereunder; provided,
however, that such tender offer occurs at a time when Continuing Directors are
in office and a majority of the Continuing Directors then in office has
determined that the offer is both adequate and otherwise in the best interests
of the Company and its stockholders (taking into account all factors that such
Continuing Directors deem relevant).

         (m)      "PERSON" shall mean any individual, firm, corporation or other
entity, and shall include any successor (by merger or otherwise) of such entity.

         (n)      "PURCHASE PRICE" shall have the meaning set forth in Section
4(a) hereof.

         (o)      "RECORD DATE" shall have the meaning set forth in the second
paragraph at the beginning of this Agreement.

         (p)      "REDEMPTION DATE" shall mean the time at which the Board of
Directors of the Company orders redemption of the Rights as provided in Section
23 hereof.

         (q)      "REDEMPTION PRICE" shall have the meaning set forth in Section
23(a) hereof.

         (r)      "RIGHTS DIVIDEND DECLARATION DATE" shall have the meaning set
forth in the second paragraph at the beginning of this Agreement.

         (s)      "SECTION 13 EVENT" shall mean any event described in clause
(i), (ii) or (iii) of Section 13(a) hereof.

                                       -4-
<PAGE>   8
         (t)      "SHARES ACQUISITION DATE" shall mean the first date of public
announcement (which, for purposes of this definition, shall include, without
limitation, a report filed pursuant to Section 13(d) under the Exchange Act) by
the Company or an Acquiring Person that an Acquiring Person has become such;
provided, however, if such person is determined not to have become an Acquiring
Person pursuant to Section 1(a)(ii) hereof, then no Shares Acquisition Date
shall be deemed to have occurred.

         (u)      "SUBSIDIARY" of any Person shall mean any corporation or other
entity of which an amount of voting securities sufficient to elect a majority of
the directors or Persons having similar authority of such corporation or other
entity is beneficially owned, directly or indirectly, by such Person, or any
corporation or other entity otherwise controlled by such Person.

         (v)      "TOTAL EXERCISE PRICE" shall have the meaning set forth in
Section 4(a) hereof.

         (w)      "TRADING DAY" shall have the meaning set forth in Section
11(d) hereof.

         (x)      A "TRIGGERING EVENT" shall be deemed to have occurred upon any
Person (other than the Company, any Subsidiary of the Company, any employee
benefit plan of the Company or any Subsidiary of the Company, or any entity
holding Common Shares for or pursuant to the terms of any such plan), together
with all Affiliates and Associates of such Person, becoming an Acquiring Person.

         Section 2. APPOINTMENT OF RIGHTS AGENT. The Company hereby appoints the
Rights Agent to act as agent for the Company and the holders of the Rights (who,
in accordance with Section 3 hereof, shall prior to the Distribution Date also
be the holders of the Common Shares) in accordance with the terms and conditions
hereof, and the Rights Agent hereby accepts such appointment. The Company may
from time to time appoint such co-Rights Agents as it may deem necessary or
desirable.

         Section 3. ISSUANCE OF RIGHTS CERTIFICATES.

         (a)      Until the Distribution Date, (i) the Rights will be evidenced
(subject to the provisions of Sections 3(b) and 3(c) hereof) by the certificates
for Common Shares registered in the names of the holders thereof (which
certificates shall also be deemed to be Rights Certificates) and not by separate
Rights Certificates and (ii) the right to receive Rights Certificates will be
transferable only in connection with the transfer of Common Shares. Until the
earlier of the Distribution Date or the Expiration Date, the surrender for
transfer of such certificates for Common Shares shall also constitute the
surrender for transfer of the Rights associated with the Common Shares
represented thereby. As soon as practicable after the Distribution Date, the
Company will prepare and execute, the Rights Agent will countersign, and the
Company will send or cause to be sent (and the Rights Agent will, if requested,
send) by first-class, postage-prepaid mail, to each record holder of Common
Shares as of the close of business on the Distribution Date, at the address of
such holder shown on the records of the Company, a Rights Certificate, in
substantially the form of Exhibit A hereto (a "Rights Certificate"), evidencing
one Right for each Common Share so held, subject to adjustment as

                                       -5-
<PAGE>   9
provided herein. In the event that an adjustment in the number of Rights per
Common Share has been made pursuant to Section 11(a)(i) or Section 11(i) hereof,
then at the time of distribution of the Rights Certificates, the Company shall
make the necessary and appropriate rounding adjustments (in accordance with
Section 14(a) hereof) so that Rights Certificates representing only whole
numbers of Rights are distributed and cash is paid in lieu of any fractional
Rights. As of the Distribution Date, the Rights will be evidenced solely by such
Rights Certificates and may be transferred by the transfer of the Rights
Certificates as permitted hereby, separately and apart from any transfer of one
or more Common Shares, and the holders of such Rights Certificates as listed in
the records of the Company or any transfer agent or registrar for the Rights
shall be the record holders thereof.

         (b)      On the Record Date or as soon as practicable thereafter, the
Company will send a copy of a Summary of Rights in substantially the form of
EXHIBIT B hereto (the "SUMMARY OF RIGHTS"), by first-class, postage-prepaid
mail, to each record holder of Common Shares as of the close of business on the
Record Date, at the address of such holder shown on the records of the Company.

         (c)      Unless the Board of Directors by resolution adopted at or
before the time of the issuance (including pursuant to the exercise of rights
under the Company's benefit plans) of any Common Shares specifies to the
contrary, Rights shall be issued in respect of all Common Shares that are issued
after the Record Date but prior to the earlier of the Distribution Date or the
Expiration Date or, in certain circumstances provided in Section 22 hereof,
after the Distribution Date. Certificates representing such Common Shares shall
also be deemed to be certificates for Rights, and shall bear the following
legend; provided, however, that such certificates issued after the Record Date
and prior to approximately September 15, 1996 shall bear such legend upon
transfer or replacement only, and otherwise shall retain the legend currently
thereon referring to the Prior Agreement:

         This certificate also evidences and entitles the holder hereof to
         certain rights as set forth in a First Amended and Restated Common
         Shares Rights Agreement between Octel Communications Corporation and
         The First National Bank of Boston as the Rights Agent, dated as of
         August 29, 1996, and as thereafter amended (the "RIGHTS AGREEMENT"),
         the terms of which are hereby incorporated herein by reference and a
         copy of which is on file at the principal executive offices of Octel
         Communications Corporation. Under certain circumstances, as set forth
         in the Rights Agreement, such Rights will be evidenced by separate
         certificates and will no longer be evidenced by this certificate. Octel
         Communications Corporation will mail to the holder of this certificate
         a copy of the Rights Agreement without charge after receipt of a
         written request therefor. Under certain circumstances set forth in the
         Rights Agreement, Rights issued to, or held by, any Person who is, was
         or becomes an Acquiring Person or any Affiliate or Associate thereof
         (as such terms are defined in the Rights Agreement), whether currently
         held by or on behalf of such Person or by any subsequent holder, may
         become null and void.

With respect to such certificates containing the foregoing legend, until the
earlier of (i) the Distribution Date or (ii) the Expiration Date, the Rights
associated with the Common Shares represented by such certificates shall be
evidenced by such certificates alone, and the surrender for

                                       -6-
<PAGE>   10
transfer of any such certificate shall also constitute the transfer of the
Rights associated with the Common Shares represented thereby. In the event that
the Company purchases or acquires any Common Shares after the Record Date but
prior to the Distribution Date, any Rights associated with such Common Shares
shall be deemed cancelled and retired so that the Company shall not be entitled
to exercise any Rights associated with the Common Shares which are no longer
outstanding.

         Section 4. FORM OF RIGHTS CERTIFICATES.

         (a)      The Rights Certificates (and the forms of election to purchase
Common Shares and of assignment to be printed on the reverse thereof) shall be
substantially in the form of Exhibit A hereto and may have such marks of
identification or designation and such legends, summaries or endorsements
printed thereon as the Company may deem appropriate and as are not inconsistent
with the provisions of this Agreement, or as may be required to comply with any
applicable law or with any rule or regulation made pursuant thereto or with any
rule or regulation of any stock exchange on which the Rights may from time to
time be listed, or to conform to usage. Subject to the provisions of Section 11
and Section 22 hereof, the Rights Certificates, whenever distributed, shall be
dated as of the Record Date (or in the case of Rights issued with respect to
Common Shares issued by the Company after the Record Date, as of the date of
issuance of such Common Shares) and on their face shall entitle the holders
thereof to purchase such number of Common Shares as shall be set forth therein
at the price set forth therein (such exercise price per one Common Share being
hereinafter referred to as the "Purchase Price" and the aggregate exercise price
of all Common Shares issuable upon exercise of one Right being hereinafter
referred to as the "Total Exercise Price"), but the number and type of
securities purchasable upon the exercise of each Right and the Purchase Price
shall be subject to adjustment as provided herein.

         (b)      Any Rights Certificate issued pursuant to Section 3(a) or
Section 22 hereof that represents Rights beneficially owned by: (i) an Acquiring
Person or any Associate or Affiliate of an Acquiring Person, (ii) a transferee
of an Acquiring Person (or of any such Associate or Affiliate) who becomes a
transferee after the Acquiring Person becomes such or (iii) a transferee of an
Acquiring Person (or of any such Associate or Affiliate) who becomes a
transferee prior to or concurrently with the Acquiring Person becoming such and
receives such Rights pursuant to either (A) a transfer (whether or not for
consideration) from the Acquiring Person to holders of equity interests in such
Acquiring Person or to any Person with whom such Acquiring Person has any
continuing agreement, arrangement or understanding regarding the transferred
Rights or (B) a transfer which the Board of Directors of the Company has
determined is part of a plan, arrangement or understanding which has as a
primary purpose or effect avoidance of Section 7(e) hereof, and any Rights
Certificate issued pursuant to Section 6 or Section 11 hereof upon transfer,
exchange, replacement or adjustment of any other Rights Certificate referred to
in this sentence, shall contain (to the extent feasible) the following legend:

         The Rights represented by this Rights Certificate are or were
         beneficially owned by a Person who was or became an Acquiring Person or
         an Affiliate or Associate of an Acquiring Person (as such terms are
         defined in the Rights Agreement). Accordingly, this Rights Certificate
         and

                                       -7-
<PAGE>   11
         the Rights represented hereby may become null and void in the
         circumstances specified in Section 7(e) of the Rights Agreement.

         Section 5. COUNTERSIGNATURE AND REGISTRATION.

         (a)      The Rights Certificates shall be executed on behalf of the
Company by its Chairman of the Board, its Chief Executive Officer, its President
or any Vice President, either manually or by facsimile signature, and by the
Secretary or an Assistant Secretary of the Company, either manually or by
facsimile signature, and shall have affixed thereto the Company's seal (if any)
or a facsimile thereof. The Rights Certificates shall be manually countersigned
by the Rights Agent and shall not be valid for any purpose unless countersigned.
In case any officer of the Company who shall have signed any of the Rights
Certificates shall cease to be such officer of the Company before
countersignature by the Rights Agent and issuance and delivery by the Company,
such Rights Certificates, nevertheless, may be countersigned by the Rights Agent
and issued and delivered by the Company with the same force and effect as though
the person who signed such Rights Certificates had not ceased to be such officer
of the Company; and any Rights Certificate may be signed on behalf of the
Company by any person who, at the actual date of the execution of such Rights
Certificate, shall be a proper officer of the Company to sign such Rights
Certificate, although at the date of the execution of this Agreement any such
person was not such an officer.

         (b)      Following the Distribution Date, the Rights Agent will keep or
cause to be kept, at its office designated for such purposes, books for
registration and transfer of the Rights Certificates issued hereunder. Such
books shall show the names and addresses of the respective holders of the Rights
Certificates, the number of Rights evidenced on its face by each of the Rights
Certificates and the date of each of the Rights Certificates.

         Section 6. TRANSFER, SPLIT UP, COMBINATION AND EXCHANGE OF RIGHTS
CERTIFICATES; MUTILATED, DESTROYED, LOST OR STOLEN RIGHTS CERTIFICATES.

         (a)      Subject to the provisions of Sections 7(e), 14 and 24 hereof,
at any time after the Close of Business on the Distribution Date, and at or
prior to the Close of Business on the Expiration Date, any Rights Certificate
or Rights Certificates may be transferred, split up, combined or exchanged for
another Rights Certificate or Rights Certificates, entitling the registered
holder to purchase a like number of Common Shares (or, following a Triggering
Event, other securities, cash or other assets, as the case may be) as the Rights
Certificate or Rights Certificates surrendered then entitled such holder to
purchase. Any registered holder desiring to transfer, split up, combine or
exchange any Rights Certificate or Rights Certificates shall make such request
in writing delivered to the Rights Agent, and shall surrender the Rights
Certificate or Rights Certificates to be transferred, split up, combined or
exchanged at the office of the Rights Agent designated for such purpose. Neither
the Rights Agent nor the Company shall be obligated to take any action
whatsoever with respect to the transfer of any such surrendered Rights
Certificate until the registered holder shall have completed and signed the
certificate contained in the form of assignment on the reverse side of such
Rights Certificate and shall have provided such additional evidence of the
identity of the Beneficial Owner (or former Beneficial Owner) or Affiliates or
Associates thereof as the Company shall

                                       -8-
<PAGE>   12
reasonably request. Thereupon the Rights Agent shall, subject to Sections 7(e),
14 and 24 hereof, countersign and deliver to the person entitled thereto a
Rights Certificate or Rights Certificates, as the case may be, as so requested.
The Company may require payment of a sum sufficient to cover any tax or
governmental charge that may be imposed in connection with any transfer, split
up, combination or exchange of Rights Certificates.

         (b)      Upon receipt by the Company and the Rights Agent of evidence
reasonably satisfactory to them of the loss, theft, destruction or mutilation of
a Rights Certificate, and, in case of loss, theft or destruction, of indemnity
or security reasonably satisfactory to them, and, at the Company's request,
reimbursement to the Company and the Rights Agent of all reasonable expenses
incidental thereto, and upon surrender to the Rights Agent and cancellation of
the Rights Certificate if mutilated, the Company will make and deliver a new
Rights Certificate of like tenor to the Rights Agent for delivery to the
registered holder in lieu of the Rights Certificate so lost, stolen, destroyed
or mutilated.

         Section 7. EXERCISE OF RIGHTS; PURCHASE PRICE; EXPIRATION DATE OF
RIGHTS.

         (a)      Subject to Section 7(e) hereof, the registered holder of any
Rights Certificate may exercise the Rights evidenced thereby (except as
otherwise provided herein) in whole or in part at any time after the
Distribution Date upon surrender of the Rights Certificate, with the form of
election to purchase on the reverse side thereof duly executed, to the Rights
Agent at the office of the Rights Agent designated for such purpose, together
with payment of the Purchase Price for each Common Share as to which the Rights
are exercised, at or prior to the Expiration Date.

         (b)      The Purchase Price for each Common Share issuable pursuant to
the exercise of a Right shall initially be $100.00, shall be subject to
adjustment from time to time as provided in Sections 11 and 13 hereof and shall
be payable in lawful money of the United States of America in accordance with
paragraph (c) below. Anything in this Agreement to the contrary notwithstanding,
in the event that at any time after the date of this Agreement and prior to the
Distribution Date, the Company shall (i) declare or pay any dividend on the
Common Shares payable in Common Shares or (ii) effect a subdivision, combination
or consolidation of the Common Shares (by reclassification or otherwise than by
payment of dividends in Common Shares) into a greater or lesser number of Common
Shares, then in any such case, each Common Share outstanding following such
subdivision, combination or consolidation shall continue to have a Right
associated therewith and the Purchase Price following any such event shall be
proportionately adjusted to equal the result obtained by multiplying the
Purchase Price immediately prior to such event by a fraction, the numerator of
which shall be the total number of Common Shares outstanding immediately prior
to the occurrence of the event and the denominator of which shall be the total
number of Common Shares outstanding immediately following the occurrence of such
event. The adjustment provided for in the preceding sentence shall be made
successively whenever such a dividend is declared or paid or such a subdivision,
combination or consolidation is effected.

         (c)      Upon receipt of a Rights Certificate representing exercisable
Rights, with the form of election to purchase duly executed, accompanied by
payment of the Purchase Price for the

                                       -9-
<PAGE>   13
number of Common Shares (or other securities or property, as the case may be) to
be purchased and an amount equal to any applicable transfer tax required to be
paid by the holder of such Rights Certificate in accordance with Section 9
hereof in cash, or by certified check or cashier's check payable to the order of
the Company, the Rights Agent shall, subject to Section 20(k) hereof, thereupon
promptly (i) (A) requisition from any transfer agent of the Common Shares (or
make available, if the Rights Agent is the transfer agent for the Common Shares)
a certificate or certificates for the number of Common Shares to be purchased
and the Company hereby irrevocably authorizes its transfer agent to comply with
all such requests or (B) if the Company shall have elected to deposit the total
number of Common Shares issuable upon exercise of the Rights hereunder with a
depositary agent, requisition from the depositary agent of depositary receipts
representing such number of Common Shares as are to be purchased (in which case
certificates for the Common Shares represented by such receipts shall be
deposited by the transfer agent with the depositary agent) and the Company
hereby directs the depositary agent to comply with such request, (ii) when
appropriate, requisition from the Company the amount of cash to be paid in lieu
of issuance of fractional shares in accordance with Section 14 hereof, (iii)
after receipt of such certificates or depositary receipts, cause the same to be
delivered to or upon the order of the registered holder of such Rights
Certificate, registered in such name or names as may be designated by such
holder and (iv) when appropriate, after receipt thereof, deliver such cash to or
upon the order of the registered holder of such Rights Certificate. The payment
of the Purchase Price (as such amount may be reduced (including to zero)
pursuant to Section 11(a)(iv) hereof) may be made in cash or by certified bank
check or bank draft payable to the order of the Rights Agent for the benefit of
the Company. In the event that the Company is obligated to issue other
securities of the Company, pay cash and/or distribute other property pursuant to
Section 11(a) hereof, the Company will make all arrangements necessary so that
such other securities, cash and/or other property are available for distribution
by the Rights Agent, if and when appropriate.

         (d)      In case the registered holder of any Rights Certificate shall
exercise less than all the Rights evidenced thereby, a new Rights Certificate
evidencing Rights equivalent to the Rights remaining unexercised shall be issued
by the Rights Agent to the registered holder of such Rights Certificate or to
his or her duly authorized assigns, subject to the provisions of Section 14
hereof.

         (e)      Notwithstanding anything in this Agreement to the contrary,
from and after the first occurrence of a Triggering Event or a Section 13 Event,
any Rights beneficially owned by (i) an Acquiring Person or an Associate or
Affiliate of an Acquiring Person, (ii) a transferee of an Acquiring Person (or
of any such Associate or Affiliate) who becomes a transferee after the Acquiring
Person becomes such (a "POST TRANSFEREE"), (iii) a transferee of an Acquiring
Person (or of any such Associate or Affiliate) who becomes a transferee prior to
or concurrently with the Acquiring Person becoming such and receives such Rights
pursuant to either (A) a transfer (whether or not for consideration) from the
Acquiring Person to holders of equity interests in such Acquiring Person or to
any Person with whom the Acquiring Person has any continuing agreement,
arrangement or understanding regarding the transferred Rights or (B) a transfer
which the Board of Directors of the Company has determined is part of a plan,
arrangement or understanding which has as a primary purpose or effect the
avoidance of this Section 7(e) (a "PRIOR TRANSFEREE") or (iv) any subsequent
transferee receiving transferred Rights from a Post Transferee or a Prior
Transferee, either directly or

                                      -10-
<PAGE>   14
through one or more intermediate transferees, shall become null and void without
any further action and no holder of such Rights shall have any rights whatsoever
with respect to such Rights, whether under any provision of this Agreement or
otherwise. The Company shall use all reasonable efforts to insure that the
provisions of this Section 7(e) and Section 4(b) hereof are complied with, but
shall have no liability to any holder of Rights Certificates or to any other
Person as a result of its failure to make any determinations with respect to an
Acquiring Person or any of such Acquiring Person's Affiliates, Associates or
transferees hereunder.

         (f)      Notwithstanding anything in this Agreement to the contrary,
neither the Rights Agent nor the Company shall be obligated to undertake any
action with respect to a registered holder upon the occurrence of any purported
exercise as set forth in this Section 7 unless such registered holder shall have
(i) completed and signed the certificate contained in the form of election to
purchase set forth on the reverse side of the Rights Certificate surrendered for
such exercise and (ii) provided such additional evidence of the identity of the
Beneficial Owner (or former Beneficial Owner) or Affiliates or Associates
thereof as the Company shall reasonably request.

         Section 8. CANCELLATION AND DESTRUCTION OF RIGHTS CERTIFICATES. All
Rights Certificates surrendered for the purpose of exercise, transfer, split up,
combination or exchange shall, if surrendered to the Company or to any of its
agents, be delivered to the Rights Agent for cancellation or in cancelled form,
or, if surrendered to the Rights Agent, shall be cancelled by it, and no Rights
Certificates shall be issued in lieu thereof except as expressly permitted by
any of the provisions of this Agreement. The Company shall deliver to the Rights
Agent for cancellation and retirement, and the Rights Agent shall so cancel and
retire, any other Rights Certificate purchased or acquired by the Company
otherwise than upon the exercise thereof. The Rights Agent shall deliver all
cancelled Rights Certificates to the Company, or shall, at the written request
of the Company, destroy such cancelled Rights Certificates, and in such case
shall deliver a certificate of destruction thereof to the Company.

         Section 9. RESERVATION AND AVAILABILITY OF COMMON SHARES.

         (a)      The Company covenants and agrees that it will use its best
efforts to cause to be reserved and kept available out of and to the extent of
its authorized and unissued shares of Common Stock not reserved for another
purpose (and, following the occurrence of a Triggering Event, out of its
authorized and unissued shares of Common Stock and/or other securities), the
number of Common Shares (and, following the occurrence of the Triggering Event,
Common Stock and/or other securities) that will be sufficient to permit the
exercise in full of all outstanding Rights.

         (b)      If the Company shall hereafter list any of its Common Shares
on a national securities exchange, then so long as the Common Shares (and,
following the occurrence of a Triggering Event, Common Shares and/or other
securities) issuable and deliverable upon exercise of the Rights may be listed
on such exchange, the Company shall use its best efforts to cause, from and
after such time as the Rights become exercisable (but only to the extent that it
is reasonably likely that the Rights will be exercised), all shares reserved for
such issuance to be listed on such exchange upon official notice of issuance
upon such exercise.

                                      -11-
<PAGE>   15
         (c)      The Company shall use its best efforts to (i) file, as soon as
practicable following the earliest date after the first occurrence of a
Triggering Event in which the consideration to be delivered by the Company upon
exercise of the Rights has been determined in accordance with Section 11(a)(iv)
hereof, or as soon as is required by law following the Distribution Date, as the
case may be, a registration statement under the Securities Act of 1933, as
amended (the "SECURITIES ACT"), with respect to the securities purchasable upon
exercise of the Rights on an appropriate form, (ii) cause such registration
statement to become effective as soon as practicable after such filing and (iii)
cause such registration statement to remain effective (with a prospectus at all
times meeting the requirements of the Securities Act) until the earlier of (A)
the date as of which the Rights are no longer exercisable for such securities
and (B) the date of expiration of the Rights. The Company may temporarily
suspend, for a period not to exceed ninety (90) days after the date set forth in
clause (i) of the first sentence of this Section 9(c), the exercisability of the
Rights in order to prepare and file such registration statement and permit it to
become effective. Upon any such suspension, the Company shall issue a public
announcement stating, and notify the Rights Agent, that the exercisability of
the Rights has been temporarily suspended, as well as a public announcement and
notification to the Rights Agent at such time as the suspension is no longer in
effect. The Company will also take such action as may be appropriate under, or
to ensure compliance with, the securities or "blue sky" laws of the various
states in connection with the exercisability of the Rights. Notwithstanding any
provision of this Agreement to the contrary, the Rights shall not be exercisable
in any jurisdiction, unless the requisite qualification in such jurisdiction
shall have been obtained, or an exemption therefrom shall be available, and
until a registration statement has been declared effective.

         (d)      The Company covenants and agrees that it will take all such
action as may be necessary to ensure that all Common Shares delivered upon
exercise of Rights shall, at the time of delivery of the certificates for such
Common Shares (subject to payment of the Purchase Price), be duly and validly
authorized and issued and fully paid and nonassessable shares.

         (e)      The Company further covenants and agrees that it will pay when
due and payable any and all federal and state transfer taxes and charges which
may be payable in respect of the original issuance or delivery of the Rights
Certificates or of any Common Shares upon the exercise of Rights. The Company
shall not, however, be required to pay any transfer tax which may be payable in
respect of any transfer or delivery of Rights Certificates to a person other
than, or the issuance or delivery of certificates or depositary receipts for the
Common Shares in a name other than that of, the registered holder of the Rights
Certificate evidencing Rights surrendered for exercise or to issue or to deliver
any certificates or depositary receipts for Common Shares upon the exercise of
any Rights until any such tax shall have been paid (any such tax being payable
by the holder of such Rights Certificate at the time of surrender) or until it
has been established to the Company's satisfaction that no such tax is due.

         Section 10. COMMON SHARES RECORD DATE. Each person in whose name any
certificate for a number of Common Shares is issued upon the exercise of Rights
shall for all purposes be deemed to have become the holder of record of Common
Shares represented thereby on, and such certificate shall be dated, the date
upon which the Rights Certificate evidencing such Rights was duly surrendered
and payment of the Purchase Price multiplied by the number of Common Shares with

                                      -12-
<PAGE>   16
respect to which the Rights have been exercised (and any applicable transfer
taxes) was made; provided, however, that if the date of such surrender and
payment is a date upon which the Common Shares transfer books of the Company are
closed, such person shall be deemed to have become the record holder of such
shares on, and such certificate shall be dated, the next succeeding Business Day
on which the Common Shares transfer books of the Company are open.

         Section 11. ADJUSTMENT OF PURCHASE PRICE, NUMBER OF SHARES OR NUMBER OF
RIGHTS. The Purchase Price, the number and kind of shares or other property
covered by each Right and the number of Rights outstanding are subject to
adjustment from time to time as provided in this Section 11.

         (a)      (i) In the event the Company shall at any time after the date
of this Agreement (A) declare a dividend on the Common Shares payable in Common
Shares, (B) subdivide the outstanding Common Shares, (C) combine the outstanding
Common Shares (by reverse stock split or otherwise) into a smaller number of
Common Shares, or (D) issue any shares of its capital stock in a
reclassification of the Common Shares (including any such reclassification in
connection with a consolidation or merger in which the Company is the continuing
or surviving corporation), then, in each such event, except as otherwise
provided in this Section 11 and Section 7(e) hereof, the Purchase Price in
effect at the time of the record date for such dividend or of the effective date
of such subdivision, combination or reclassification, and the number and kind of
shares of capital stock issuable on such date, shall be proportionately adjusted
so that the holder of any Right exercised after such time shall be entitled to
receive the aggregate number and kind of shares of capital stock which, if such
Right had been exercised immediately prior to such date and at a time when the
Common Shares transfer book of the Company were open, such holder would have
owned upon such exercise and been entitled to receive by virtue of such
dividend, subdivision, combination or reclassification; provided, however, that
in no event shall the consideration to be paid upon the exercise of one Right be
less than the aggregate par value of the shares of capital stock of the Company
issuable upon exercise of such Right. If an event occurs which would require an
adjustment under both this Section 11(a)(i) and Section 11(a)(ii) hereof, the
adjustment provided for in this Section 11(a)(i) shall be in addition to, and
shall be made prior to, any adjustment required pursuant to Section 11(a)(ii)
hereof.


                  (ii)     Subject to Section 24 of this Agreement, in the event
a Triggering Event shall have occurred, then promptly following such Triggering
Event, proper provision shall be made so that each holder of a Right, except as
provided in Section 7(e) hereof, shall thereafter have the right to receive for
each Right, upon exercise thereof in accordance with the terms of this Agreement
and payment of the then-current Total Exercise Price, such number of Common
Shares of the Company as shall equal the result obtained by multiplying the
then-current Purchase Price by the then number of Common Shares for which a
Right was exercisable (or would have been exercisable if the Distribution Date
had occurred) immediately prior to the first occurrence of a Triggering Event,
and dividing that product by 50% of the current per share market price
(determined pursuant to Section 11(d) hereof) for Common Shares on the date of
occurrence of the Triggering Event (such number of shares being hereinafter
referred to as the "ADJUSTMENT SHARES").

                                      -13-
<PAGE>   17
                  (iii)    The right to buy Common Shares of the Company
pursuant to Section 11(a)(ii) hereof shall not arise as a result of any Person
becoming an Acquiring Person through a purchase of Common Shares pursuant to a
Permitted Offer.

                  (iv)     In lieu of issuing Common Shares in accordance with
Section 11(a)(ii) hereof, the Company may, if the Board of Directors determines
that such action is necessary or appropriate and not contrary to the interest of
holders of Rights (and, in the event that the number of Common Shares which are
authorized by the Company's Certificate of Incorporation but not outstanding or
reserved for issuance for purposes other than upon exercise of the Rights are
not sufficient to permit the exercise in full of the Rights, or if any necessary
regulatory approval for such issuance has not been obtained by the Company, the
Company shall): (A) determine the excess of (1) the value of the Common Shares
issuable upon the exercise of a Right (the "CURRENT VALUE") over (2) the
Purchase Price (such excess, the "SPREAD") and (B) with respect to each Right,
make adequate provision to substitute for such Common Shares, upon exercise of
the Rights (including, without limitation, full payment of the Purchase Price),
(1) cash, (2) a reduction in the Purchase Price, (3) other equity securities of
the Company (including, without limitation, shares or units of shares of any
series of preferred stock which the Board of Directors of the Company has deemed
to have the same value as Common Shares (such shares or units of shares of
preferred stock are herein called "common stock equivalents")), except to the
extent that the Company has not obtained any necessary stockholder or regulatory
approval for such issuance, (4) debt securities of the Company, except to the
extent that the Company has not obtained any necessary stockholder or regulatory
approval for such issuance, (5) other assets or (6) any combination of the
foregoing, having an aggregate value equal to the Current Value, where such
aggregate value has been determined by the Board of Directors of the Company
based upon the advice of a nationally recognized investment banking firm
selected by the Board of Directors of the Company; provided, however, if the
Company shall not have made adequate provision to deliver value pursuant to
clause (B) above within thirty (30) days following the later of (x) the first
occurrence of a Triggering Event and (y) the date on which the Company's right
of redemption pursuant to Section 23(a) expires (the later of (x) and (y) being
referred to herein as the "Section 11(a)(ii) Trigger Date"), then the Company
shall be obligated to deliver, upon the surrender for exercise of a Right and
without requiring payment of the Purchase Price, Common Shares (to the extent
available), except to the extent that the Company has not obtained any necessary
stockholder or regulatory approval for such issuance, and then, if necessary,
cash, which shares and/or cash have an aggregate value equal to the Spread. If
the Board of Directors of the Company shall determine in good faith that it is
likely that sufficient additional Common Shares could be authorized for issuance
upon exercise in full of the Rights or that any necessary regulatory approval
for such issuance will be obtained, the thirty (30) day period set forth above
may be extended to the extent necessary, but not more than ninety (90) days
after the Section 11(a)(ii) Trigger Date, in order that the Company may seek
stockholder approval for the authorization of such additional shares or take
action to obtain such regulatory approval (such period, as it may be extended,
the "Substitution Period"). To the extent that the Company determines that some
action need be taken pursuant to the first and/or second sentences of this
Section 11(a)(iv), the Company (x) shall provide, subject to Section 7(e)
hereof, that such action shall apply uniformly to all outstanding Rights and (y)
may suspend the exercisability of the Rights until the expiration of the
Substitution Period in order to seek any authorization of additional shares, to
take any action to obtain any required regulatory approval

                                      -14-
<PAGE>   18
and/or to decide the appropriate form of distribution to be made pursuant to
such first sentence and to determine the value thereof. In the event of any such
suspension, the Company shall issue a public announcement stating that the
exercisability of the Rights has been temporarily suspended, as well as a public
announcement at such time as the suspension is no longer in effect. For purposes
of this Section 11(a)(iv), the value of the Common Shares shall be the current
per share market price (as determined pursuant to Section 11(d) hereof) of the
Common Shares on the Section 11(a)(ii) Trigger Date and the value of any "common
stock equivalent" shall be deemed to have the same value as the Common Shares on
such date.

         (b)      In case the Company shall, at any time after the date of this
Agreement, fix a record date for the issuance of rights, options or warrants to
all holders of Common Shares or of any class or series of Equivalent Shares
entitling such holders (for a period expiring within forty-five (45) calendar
days after such record date) to subscribe for or purchase Common Shares or
Equivalent Shares or securities convertible into Common Shares or Equivalent
Shares at a price per share (or having a conversion price per share, if a
security convertible into Common Shares or Equivalent Shares) less than the then
current per share market price of the Common Shares or Equivalent Shares (as
defined in Section 11(d)) on such record date, then, in each such case, the
Purchase Price to be in effect after such record date shall be determined by
multiplying the Purchase Price in effect immediately prior to such record date
by a fraction, the numerator of which shall be the number of Common Shares and
Equivalent Shares (if any) outstanding on such record date, plus the number of
Common Shares or Equivalent Shares, as the case may be, which the aggregate
offering price of the total number of Common Shares or Equivalent Shares, as the
case may be, so to be offered (and/or the aggregate initial conversion price of
the convertible securities so to be offered) would purchase at such current
market price, and the denominator of which shall be the number of Common Shares
and Equivalent Shares (if any) outstanding on such record date, plus the number
of additional Common Shares or Equivalent Shares, as the case may be, to be
offered for subscription or purchase (or into which the convertible securities
so to be offered are initially convertible). In case such subscription price may
be paid in a consideration part or all of which shall be in a form other than
cash, the value of such consideration shall be as determined in good faith by
the Board of Directors of the Company, whose determination shall be described in
a statement filed with the Rights Agent and shall be binding on the Rights Agent
and the holders of the Rights. Common Shares and Equivalent Shares owned by or
held for the account of the Company shall not be deemed outstanding for the
purpose of any such computation. Such adjustment shall be made successively
whenever such a record date is fixed, and in the event that such rights, options
or warrants are not so issued, the Purchase Price shall be adjusted to be the
Purchase Price which would then be in effect if such record date had not been
fixed.

         (c)      In case the Company shall, at any time after the date of this
Agreement, fix a record date for the making of a distribution to all holders of
the Common Shares or of any class or series of Equivalent Shares (including any
such distribution made in connection with a consolidation or merger in which 
the Company is the continuing or surviving corporation) of evidences of 
indebtedness or assets (other than a regular quarterly cash dividend, if any, 
or a dividend payable in Common Shares) or subscription rights, options or 
warrants (excluding those referred to in Section 11(b)), then, in each such 
case, the Purchase Price to be in effect after such record date shall be

                                      -15-
<PAGE>   19
determined by multiplying the Purchase Price in effect immediately prior to such
record date by a fraction, the numerator of which shall be the current per share
market price (as determined pursuant to Section 11(d) hereof) of a Common Share
or an Equivalent Share on such record date, less the fair market value (as
determined in good faith by the Board of Directors of the Company, whose
determination shall be described in a statement filed with the Rights Agent) of
the portion of the cash, assets or evidences of indebtedness so to be
distributed or of such subscription rights or warrants applicable to a Common
Share or Equivalent Share, as the case may be, and the denominator of which
shall be such current per share market price (as determined pursuant to Section
11(d) hereof) of a Common Share or Equivalent Share on such record date. Such
adjustments shall be made successively whenever such a record date is fixed, and
in the event that such distribution is not so made, the Purchase Price shall be
adjusted to be the Purchase Price which would have been in effect if such record
date had not been fixed.

         (d)      For the purpose of any computation hereunder, other than
computations made pursuant to Section 11(a)(iv) hereof, the "current per share
market price" of any security (a "SECURITY" for the purpose of this Section
11(d)) on any date shall be deemed to be the average of the daily closing prices
per share of such Security for the thirty (30) consecutive Trading Days (as such
term is hereinafter defined) immediately prior to such date, and for purposes of
computations made pursuant to Section 11(a)(iv) hereof, the "current per share
market price" of any Security on any date shall be deemed to be the average of
the daily closing prices per share of such Security for the ten (10) consecutive
Trading Days immediately prior to such date; provided, however, that in the
event that the current per share market price of the Security is determined
during a period following the announcement by the issuer of such Security of (i)
a dividend or distribution on such Security payable in shares of such Security
or securities convertible into such shares or (ii) any subdivision, combination
or reclassification of such Security, and prior to the expiration of the
requisite thirty (30) Trading Day or ten (10) Trading Day period, after the
ex-dividend date for such dividend or distribution, or the record date for such
subdivision, combination or reclassification, then, and in each such case, the
current per share market price shall be appropriately adjusted to reflect the
current market price per share equivalent of such Security. The closing price
for each day shall be the last sale price, regular way, or, in case no such sale
takes place on such day, the average of the closing bid and asked prices,
regular way, in either case as reported in the principal consolidated
transaction reporting system with respect to securities listed or admitted to
trading on the New York Stock Exchange or, if the Security is not listed or
admitted to trading on the New York Stock Exchange, as reported in the principal
consolidated transaction reporting system with respect to securities listed on
the principal national securities exchange on which the Security is listed or
admitted to trading or, if the Security is not listed or admitted to trading on
any national securities exchange, the last sale price or, if such last sale
price is not reported, the average of the high bid and low asked prices in the
over-the-counter market, as reported by the Nasdaq National Market ("NASDAQ") or
such other system then in use, or, if on any such date the Security is not
quoted by any such organization, the average of the closing bid and asked prices
as furnished by a professional market maker making a market in the Security
selected by the Board of Directors of the Company. If on any such date no market
maker is making a market in the Common Shares, the fair value of such shares on
such date as determined in good faith by the Board of Directors of the Company
shall be used. The term "TRADING DAY" shall mean a day on which the principal
national securities exchange on which the

                                      -16-
<PAGE>   20
Security is listed or admitted to trading is open for the transaction of
business or, if the Security is not listed or admitted to trading on any
national securities exchange, a Business Day. If the Common Shares are not
publicly held or so listed or traded, "current per share market price" shall
mean the fair value per share as determined in good faith by the Board of
Directors of the Company, whose determination shall be described in a statement
filed with the Rights Agent and shall be conclusive for all purposes.

         (e)      Anything herein to the contrary notwithstanding, no adjustment
in the Purchase Price shall be required unless such adjustment would require an
increase or decrease of at least 1% in the Purchase Price; provided, however,
that any adjustments which by reason of this Section 11(e) are not required to
be made shall be carried forward and taken into account in any subsequent 
adjustment. All calculations under this Section 11 shall be made to the nearest
cent or to the nearest ten-thousandth of a Common Share or other share, as the 
case may be. Notwithstanding the first sentence of this Section 11(e), any
adjustment required by this Section 11 shall be made no later than the earlier
of (i) three (3) years from the date of the transaction which requires such
adjustment or (ii) the Expiration Date.

         (f)      If as a result of an adjustment made pursuant to Section 11(a)
or 13(a) hereof, the holder of any Right thereafter exercised shall become
entitled to receive any shares of capital stock other than Common Shares,
thereafter the number of such other shares so receivable upon exercise of any
Right and if required, the Purchase Price thereof, shall be subject to
adjustment from time to time in a manner and on terms as nearly equivalent as
practicable to the provisions with respect to the Common Shares contained in
Sections 11(a), (b), (c), (e), (h), (i), (j), (k), (l) and (m), and the
provisions of Sections 7, 9, 10, 13 and 14 with respect to the Common Shares
shall apply on like terms to any such other shares.

         (g)      All Rights originally issued by the Company subsequent to any
adjustment made to the Purchase Price hereunder shall evidence the right to
purchase, at the adjusted Purchase Price, the number of Common Shares
purchasable from time to time hereunder upon exercise of the Rights, all subject
to further adjustment as provided herein.

         (h)      Unless the Company shall have exercised its election as
provided in Section 11(i), upon each adjustment of the Purchase Price as a
result of the calculations made in Section 11(b), each Right outstanding
immediately prior to the making of such adjustment shall thereafter evidence the
right to purchase, at the adjusted Purchase Price, that number of Common Shares
(calculated to the nearest one ten-thousandth of a share) obtained by (i)
multiplying (x) the number of Common Shares covered by a Right immediately prior
to this adjustment, by (y) the Purchase Price in effect immediately prior to
such adjustment of the Purchase Price, and (ii) dividing the product so obtained
by the Purchase Price in effect immediately after such adjustment of the
Purchase Price.

         (i)      The Company may elect on or after the date of any adjustment
of the Purchase Price as a result of the calculations made in Section 11(b) to
adjust the number of Rights, in substitution for any adjustment in the number
of Common Shares purchasable upon the exercise of a Right. Each of the Rights
outstanding after such adjustment of the number of Rights shall be exercisable
for

                                      -17-
<PAGE>   21
the number of Common Shares for which a Right was exercisable immediately prior
to such adjustment. Each Right held of record prior to such adjustment of the
number of Rights shall become that number of Rights (calculated to the nearest
ten-thousandth) obtained by dividing the Purchase Price in effect immediately
prior to adjustment of the Purchase Price by the Purchase Price in effect
immediately after adjustment of the Purchase Price. The Company shall make a
public announcement of its election to adjust the number of Rights, indicating
the record date for the adjustment, and, if known at the time, the amount of the
adjustment to be made. This record date may be the date on which the Purchase
Price is adjusted or any day thereafter, but, if the Rights Certificates have
been issued, shall be at least ten (10) days later than the date of the public
announcement. If Rights Certificates have been issued, upon each adjustment of
the number of Rights pursuant to this Section 11(i), the Company shall, as
promptly as practicable, cause to be distributed to holders of record of Rights
Certificates on such record date Rights Certificates evidencing, subject to
Section 14 hereof, the additional Rights to which such holders shall be entitled
as a result of such adjustment, or, at the option of the Company, shall cause to
be distributed to such holders of record in substitution and replacement for the
Rights Certificates held by such holders prior to the date of adjustment, and
upon surrender thereof, if required by the Company, new Rights Certificates
evidencing all the Rights to which such holders shall be entitled after such
adjustment. Rights Certificates so to be distributed shall be issued, executed
and countersigned in the manner provided for herein (and may bear, at the option
of the Company, the adjusted Purchase Price) and shall be registered in the
names of the holders of record of Rights Certificates on the record date
specified in the public announcement.

         (j)      Irrespective of any adjustment or change in the Purchase Price
or the number of Common Shares issuable upon the exercise of the Rights, the
Rights Certificates theretofore and thereafter issued may continue to express
the Purchase Price per Common Share and the number of Common Shares which were
expressed in the initial Rights Certificates issued hereunder.

         (k)      Before taking any action that would cause an adjustment
reducing the Purchase Price below the par or stated value, if any, of the number
of Common Shares issuable upon exercise of the Rights, the Company shall take
any corporate action which may, in the opinion of its counsel, be necessary in
order that the Company may validly and legally issue as fully paid and
nonassessable shares such number of Common Shares at such adjusted Purchase
Price.

         (l)      In any case in which this Section 11 shall require that an
adjustment in the Purchase Price be made effective as of a record date for a
specified event, the Company may elect to defer until the occurrence of such
event the issuing to the holder of any Right exercised after such record date of
the number of Common Shares and other capital stock or securities of the
Company, if any, issuable upon such exercise over and above the number of Common
Shares and other capital stock or securities of the Company, if any, issuable
upon such exercise on the basis of the Purchase Price in effect prior to such
adjustment; provided, however, that the Company shall deliver to such holder a
due bill or other appropriate instrument evidencing such holder's right to
receive such additional shares (fractional or otherwise) upon the occurrence of
the event requiring such adjustment.

                                      -18-
<PAGE>   22
         (m)      Anything in this Section 11 to the contrary notwithstanding,
prior to the Distribution Date, the Company shall be entitled to make such
reductions in the Purchase Price, in addition to those adjustments expressly
required by this Section 11, as and to the extent that it in its sole discretion
shall determine to be advisable in order that any (i) consolidation or
subdivision of the Common Shares, (ii) issuance wholly for cash of any Common
Shares at less than the current market price, (iii) issuance wholly for cash of
Common Shares or securities which by their terms are convertible into or
exchangeable for Common Shares, (iv) stock dividends or (v) issuance of rights,
options or warrants referred to in this Section 11, hereafter made by the
Company to holders of its Common Shares shall not be taxable to such
stockholders.

         (n)      The Company covenants and agrees that it shall not, at any
time after the Distribution Date, effect or permit to occur any Triggering Event
or Section 13 Event, if (i) at the time or immediately after such Triggering
Event or Section 13 Event there are any rights, warrants or other instruments or
securities outstanding or agreements in effect which would substantially
diminish or otherwise eliminate the benefits intended to be afforded by the
Rights or (ii) prior to, simultaneously with or immediately after such Section
13 Event, the stockholders of the Person who constitutes, or would constitute,
the "Principal Party" for purposes of Section 13(b) hereof shall have received a
distribution of Rights previously owned by such Person or any of its Affiliates
and Associates.

         (o)      The Company covenants and agrees that, after the Distribution
Date, it will not, except as permitted by Sections 23, 24 or 27 hereof, take (or
permit to be taken) any action if at the time such action is taken it is
reasonably foreseeable that such action will diminish substantially or otherwise
eliminate the benefits intended to be afforded by the Rights.

         Section 12. CERTIFICATE OF ADJUSTED PURCHASE PRICE OR NUMBER OF SHARES.
Whenever an adjustment is made as provided in Sections 11 and 13 hereof, the
Company shall promptly (a) prepare a certificate setting forth such adjustment
and a brief statement of the facts accounting for such adjustment, (b) file with
the Rights Agent and with each transfer agent for the Common Shares a copy of
such certificate and (c) mail a brief summary thereof to each holder of a Rights
Certificate in accordance with Section 26 hereof. Notwithstanding the foregoing
sentence, the failure of the Company to make such certification or give such
notice shall not affect the validity of such adjustment or the force or effect
of the requirement for such adjustment. The Rights Agent shall be fully
protected in relying on any such certificate and on any adjustment contained
therein and shall not be deemed to have knowledge of such adjustment unless and
until it shall have received such certificate.

         Section 13. CONSOLIDATION, MERGER OR SALE OR TRANSFER OF ASSETS OR
EARNING POWER.

         (a)      In the event that, following the Shares Acquisition Date,
directly or indirectly:

                  (i)      the Company shall consolidate with, or merge with and
into, any other Person (other than a Subsidiary of the Company in a transaction
the principal purpose of which is to change the state of incorporation of the
Company or which complies with Section 11(o) hereof);

                                      -19-
<PAGE>   23
                  (ii)     any Person (other than a Subsidiary of the Company in
a transaction that complies with Section 11(o) hereof) shall consolidate with
the Company, or merge with and into the Company and the Company shall be the
continuing or surviving corporation of such consolidation or merger; or

                  (iii)    the Company shall sell or otherwise transfer (or one
or more of its Subsidiaries shall sell or otherwise transfer), in one or more
transactions, assets or earning power aggregating 50% or more of the assets or
earning power of the Company and its Subsidiaries (taken as a whole) to any
other Person or Persons (other than the Company or one or more of its wholly
owned Subsidiaries in one or more transactions, each of which complies with
Section 11(o) hereof),

             then, and in each such case, proper provision shall be made so that

                           (A)      each holder of a Right (except as otherwise
provided herein) shall thereafter have the right to receive, upon the exercise
thereof in accordance with the terms of this Agreement, such number of validly
authorized and issued, fully paid and nonassessable Common Shares of the
Principal Party (as hereinafter defined), free of any liens, encumbrances,
rights of first refusal or other adverse claims, as shall be equal to the result
obtained by (1) multiplying the then current Purchase Price by the number of
Common Shares for which a Right was exercisable immediately prior to the first
occurrence of a Section 13 Event (or, if a Triggering Event has occurred prior
to the first occurrence of a Section 13 Event, multiplying the number of such
Common Shares for which a Right was exercisable immediately prior to the first
occurrence of a Triggering Event by the Purchase Price in effect immediately
prior to such first occurrence) and (2) dividing that product (which, following
the first occurrence of a Section 13 Event, shall be referred to as the "Total
Exercise Price" for each Right and for all purposes of this Agreement) by 50% of
the current per share market price (determined pursuant to Section 11(d) hereof)
of the Common Shares of such Principal Party on the date of consummation of such
Section 13 Event;

                           (B)      such Principal Party shall thereafter be
liable for, and shall assume, by virtue of such Section 13 Event, all the
obligations and duties of the Company pursuant to this Agreement;

                           (C)      the term "COMPANY" shall thereafter be
deemed to refer to such Principal Party, it being specifically intended that the
provisions of Section 11 hereof shall apply only to such Principal Party
following the first occurrence of a Section 13 Event;

                           (D)      such Principal Party shall take such steps
(including, but not limited to, the reservation of a sufficient number of its
Common Shares) in connection with the consummation of any such transaction as
may be necessary to assure that the provisions hereof shall thereafter be
applicable, as nearly as reasonably may be, in relation to its Common Shares
thereafter deliverable upon the exercise of the Rights.

         (b)      "PRINCIPAL PARTY" shall mean, in the case of any transaction
described in clause (i), (ii) or (iii) of Section 13(a), the Person or Acquiring
Person referred to therein (or such Person's

                                      -20-
<PAGE>   24
or Acquiring Person's successor, including, if applicable, the Company, if it is
the surviving corporation), provided, however, that in any such case, (i) if
such Person is a direct or indirect Subsidiary of another Person, "Principal
Party" shall refer to such other Person and (ii) in case such Person is a
Subsidiary, directly or indirectly, of more than one Person, "Principal Party"
shall refer to whichever of such Persons is the issuer of the Common Shares
having the greatest aggregate value, and provided further, that for purposes of
transactions described in clause (iii) hereof, "PRINCIPAL PARTY" shall refer to
that Person receiving the greatest portion of the assets or earning power
transferred pursuant to such transaction or transactions.

         (c)      If, for any reason, the Rights cannot be exercised for Common
Shares of such Principal Party as provided in Section 13(a), then each holder of
Rights shall have the right to exchange its Rights for cash from such Principal
Party in an amount equal to the number of Common Shares that it would otherwise
be entitled to purchase times 50% of the current per share market price, as
determined pursuant to Section 11(d) hereof, of such Common Shares of such
Principal Party. If, for any reason, the foregoing formulation cannot be applied
to determine the cash amount into which the Rights are exchangeable, then the
Board of Directors, based upon the advice of one or more nationally recognized
investment banking firms, and based upon the total value of the Company, shall
determine such amount reasonably and with good faith to the holders of Rights.
Any such determination shall be final and binding on the Rights Agent.

         (d)      Notwithstanding anything in this Agreement to the contrary,
Section 13 shall not be applicable to a transaction described in clauses (i) and
(ii) of Section 13(a) if: (i) such transaction is consummated with a Person or
Persons who acquired Common Shares pursuant to a Permitted Offer (or a
wholly-owned Subsidiary of any such Person or Persons); (ii) the price per share
of Common Shares offered in such transaction is not less than the price per
share of Common Shares paid to all holders of Common Shares whose shares were
purchased pursuant to such Permitted Offer; and (iii) the form of consideration
being offered to the remaining holders of Common Shares pursuant to such
transaction is the same form as the form of consideration paid pursuant to such
Permitted Offer. Upon consummation of any such transaction contemplated by this
Section 13(d), all Rights hereunder shall expire.

         (e)      The Company shall not consummate any Section 13 Event unless
the Principal Party shall have a sufficient number of authorized Common Shares
that have not been issued or reserved for issuance to permit the exercise in
full of the Rights in accordance with this Section 13 and unless prior thereto
the Company and such issuer shall have executed and delivered to the Rights
Agent a supplemental agreement confirming that such Principal Party shall, upon
consummation of such Section 13 Event, assume this Agreement in accordance with
Sections 13(a) and (b) hereof, that all rights of first refusal or preemptive
rights in respect of the issuance of Common Shares of such Principal Party upon
exercise of outstanding Rights have been waived, that there are no rights,
warrants, instruments or securities outstanding or any agreements or
arrangements which, as a result of the consummation of such transaction, would
eliminate or substantially diminish the benefits intended to be afforded by the
Rights and that such transaction shall not result in a default by such Principal
Party under this Agreement, and further providing that, as soon as practicable
after the date of such Section 13 Event, such Principal Party will:

                                      -21-
<PAGE>   25
                  (i)      prepare and file a registration statement under the
Securities Act with respect to the Rights and the securities purchasable upon
exercise of the Rights on an appropriate form, use its best efforts to cause
such registration statement to become effective as soon as practicable after
such filing and use its best efforts to cause such registration statement to
remain effective (with a prospectus at all times meeting the requirements of the
Securities Act) until the Expiration Date, and similarly comply with applicable
state securities laws;

                  (ii)     use its best efforts to list (or continue the listing
of) the Rights and the securities purchasable upon exercise of the Rights on a
national securities exchange or to meet the eligibility requirements for
quotation on Nasdaq; and

                  (iii)    deliver to holders of the Rights historical financial
statements for such Principal Party which comply in all respects with the
requirements for registration on Form 10 (or any successor form) under the
Exchange Act.

                           In the event that at any time after the occurrence of
a Triggering Event some or all of the Rights shall not have been exercised at
the time of a transaction described in this Section 13, the Rights which have
not theretofore been exercised shall thereafter be exercisable in the manner
described in Section 13(a) (without taking into account any prior adjustment
required by Section 11(a)(ii)).

         (f)      The provisions of this Section 13 shall similarly apply to
successive mergers or consolidations or sales or other transfers.

         Section 14. FRACTIONAL RIGHTS AND FRACTIONAL SHARES.

         (a)      The Company shall not be required to issue fractions of Rights
or to distribute Rights Certificates which evidence fractional Rights. In lieu
of such fractional Rights, there shall be paid to the registered holders of the
Rights Certificates with regard to which such fractional Rights would otherwise
be issuable, an amount in cash equal to the same fraction of the current market
value of a whole Right. For the purposes of this Section 14(a), the current
market value of a whole Right shall be the closing price of the Rights for the
Trading Day immediately prior to the date on which such fractional Rights would
have been otherwise issuable, as determined pursuant to the second sentence of
Section 11(d) hereof.

         (b)      The Company shall not be required to issue fractions of Common
Shares upon exercise of the Rights or to distribute certificates which evidence
fractional Common Shares. In lieu of fractional Common Shares, the Company shall
pay to the registered holders of Rights Certificates at the time such Rights are
exercised as herein provided an amount in cash equal to the same fraction of the
current market value of a Common Share. For purposes of this Section 14(b), the
current market value of a Common Share shall be the closing price of a Common
Share (as determined pursuant to the second sentence of Section 11(d) hereof)
for the Trading Day immediately prior to the date of such exercise.

                                      -22-
<PAGE>   26
         (c)      The holder of a Right by the acceptance of the Right expressly
waives his or her right to receive any fractional Rights or any fractional
shares upon exercise of a Right.

         Section 15. RIGHTS OF ACTION. All rights of action in respect of this
Agreement, excepting the rights of action given to the Rights Agent under
Section 18 hereof, are vested in the respective registered holders of the Rights
Certificates (and, prior to the Distribution Date, the registered holders of the
Common Shares); and any registered holder of any Rights Certificate (or, prior
to the Distribution Date, of the Common Shares), without the consent of the
Rights Agent or of the holder of any other Rights Certificate (or, prior to the
Distribution Date, of the Common Shares), may, in his or her own behalf and for
his or her own benefit, enforce, and may institute and maintain any suit, action
or proceeding against the Company to enforce, or otherwise act in respect of,
his or her right to exercise the Rights evidenced by such Rights Certificate in
the manner provided in such Rights Certificate and in this Agreement. Without
limiting the foregoing or any remedies available to the holders of Rights, it is
specifically acknowledged that the holders of Rights would not have an adequate
remedy at law for any breach of this Agreement and will be entitled to specific
performance of the obligations under, and injunctive relief against actual or
threatened violations of, the obligations of any Person subject to this
Agreement.

         Section 16. AGREEMENT OF RIGHTS HOLDERS. Every holder of a Right, by
accepting the same, consents and agrees with the Company and the Rights Agent
and with every other holder of a Right that:

         (a)      prior to the Distribution Date, the Rights will be
transferable only in connection with the transfer of the Common Shares;

         (b)      after the Distribution Date, the Rights Certificates are
transferable only on the registry books of the Rights Agent if surrendered at
the principal office or offices of the Rights Agent designated for such
purposes, duly endorsed or accompanied by a proper instrument of transfer and
with the appropriate forms and certificates fully executed; and

         (c)      subject to Sections 6(a) and 7(f) hereof, the Company and the
Rights Agent may deem and treat the person in whose name the Rights Certificate
(or, prior to the Distribution Date, the associated Common Shares certificate)
is registered as the absolute owner thereof and of the Rights evidenced thereby
(notwithstanding any notations of ownership or writing on the Rights
Certificates or the associated Common Shares certificate made by anyone other
than the Company or the Rights Agent) for all purposes whatsoever, and neither
the Company nor the Rights Agent shall be affected by any notice to the
contrary.

         Section 17. RIGHTS CERTIFICATE HOLDER NOT DEEMED A STOCKHOLDER. No
holder, as such, of any Rights Certificate shall be entitled to vote, receive
dividends or be deemed for any purpose the holder of the Common Shares or any
other securities of the Company which may at any time be issuable on the
exercise of the Rights represented thereby, nor shall anything contained herein
or in any Rights Certificate be construed to confer upon the holder of any
Rights Certificate, as such, any of the rights of a stockholder of the Company
or any right to vote for the election of directors or

                                      -23-
<PAGE>   27
upon any matter submitted to stockholders at any meeting thereof, or to give or
withhold consent to any corporate action, or to receive notice of meetings or
other actions affecting stockholders (except as provided in Section 25 hereof),
or to receive dividends or subscription rights, or otherwise, until the Right or
Rights evidenced by such Rights Certificate shall have been exercised in
accordance with the provisions hereof.

         Section 18. CONCERNING THE RIGHTS AGENT.

         (a)      The Company agrees to pay to the Rights Agent reasonable
compensation for all services rendered by it hereunder and, from time to time,
on demand of the Rights Agent, its reasonable expenses and counsel fees and
other disbursements incurred in the administration and execution of this
Agreement and the exercise and performance of its duties hereunder. The Company
also agrees to indemnify the Rights Agent for, and to hold it harmless against,
any loss, liability or expense, incurred without negligence, bad faith or
willful misconduct on the part of the Rights Agent, for anything done or omitted
by the Rights Agent in connection with the acceptance and administration of this
Agreement, including the costs and expenses of defending against any claim of
liability in the premises.

         (b)      The Rights Agent shall be protected and shall incur no
liability for, or in respect of any action taken, suffered or omitted by it in
connection with, its administration of this Agreement in reliance upon any
Rights Certificate or certificate for the Common Shares or for other securities
of the Company, instrument of assignment or transfer, power of attorney,
endorsement, affidavit, letter, notice, direction, consent, certificate,
statement or other paper or document believed by it to be genuine and to be
signed, executed and, where necessary, verified or acknowledged, by the proper
Person or Persons, or otherwise upon the advice of counsel as set forth in
Section 20 hereof.

         Section 19. MERGER OR CONSOLIDATION OR CHANGE OF NAME OF RIGHTS AGENT.

         (a)      Any corporation into which the Rights Agent or any successor
Rights Agent may be merged or with which it may be consolidated, or any
corporation resulting from any merger or consolidation to which the Rights Agent
or any successor Rights Agent shall be a party, or any corporation succeeding to
the corporate trust business of the Rights Agent or any successor Rights Agent,
shall be the successor to the Rights Agent under this Agreement without the
execution or filing of any paper or any further act on the part of any of the
parties hereto; provided, however, that such corporation would be eligible for
appointment as a successor Rights Agent under the provisions of Section 21
hereof. In case at the time such successor Rights Agent shall succeed to the
agency created by this Agreement, any of the Rights Certificates shall have been
countersigned but not delivered, any such successor Rights Agent may adopt the
countersignature of the predecessor Rights Agent and deliver such Rights
Certificates so countersigned; and in case at that time any of the Rights
Certificates shall not have been countersigned, any successor Rights Agent may
countersign such Rights Certificates either in the name of the predecessor
Rights Agent or in the name of the successor Rights Agent; and in all such cases
such Rights Certificates shall have the full force provided in the Rights
Certificates and in this Agreement.

                                      -24-
<PAGE>   28
         (b)      In case at any time the name of the Rights Agent shall be
changed and at such time any of the Rights Certificates shall have been
countersigned but not delivered, the Rights Agent may adopt the countersignature
under its prior name and deliver Rights Certificates so countersigned; and in
case at that time any of the Rights Certificates shall not have been
countersigned, the Rights Agent may countersign such Rights Certificates either
in its prior name or in its changed name; and in all such cases such Rights
Certificates shall have the full force provided in the Rights Certificates and
in this Agreement.

         Section 20. DUTIES OF RIGHTS AGENT. The Rights Agent undertakes the
duties and obligations imposed by this Agreement upon the following terms and
conditions, by all of which the Company and the holders of Rights Certificates,
by their acceptance thereof, shall be bound:

         (a)      The Rights Agent may consult with legal counsel (who may be
legal counsel for the Company), and the written advice or opinion of such
counsel shall be full and complete authorization and protection to the Rights
Agent as to any action taken or omitted by it in good faith and in accordance
with such written advice or opinion.

         (b)      Whenever in the performance of its duties under this Agreement
the Rights Agent shall deem it necessary or desirable that any fact or matter
(including, without limitation, the identity of any Acquiring Person and the
determination of "current per share market price") be proved or established by
the Company prior to taking or suffering any action hereunder, such fact or
matter (unless other evidence in respect thereof be herein specifically
prescribed) may be deemed to be conclusively proved and established by a
certificate signed by any one of the Chairman of the Board, the Chief Executive
Officer, the President, any Vice President, the Chief Financial Officer, the
Secretary or any Assistant Secretary of the Company and delivered to the Rights
Agent; and such certificate shall be full authorization to the Rights Agent for
any action taken or suffered in good faith by it under the provisions of this
Agreement in reliance upon such certificate.

         (c)      The Rights Agent shall be liable hereunder to the Company and
any other Person only for its own negligence, bad faith or willful misconduct.

         (d)      The Rights Agent shall not be liable for or by reason of any
of the statements of fact or recitals contained in this Agreement or in the
Rights Certificates (except its countersignature thereof) or be required to
verify the same, but all such statements and recitals are and shall be deemed to
have been made by the Company only.

         (e)      The Rights Agent shall not be under any responsibility in
respect of the validity of this Agreement or the execution and delivery hereof
(except the due execution hereof by the Rights Agent) or in respect of the
validity or execution of any Rights Certificate (except its countersignature
thereof); nor shall it be responsible for any breach by the Company of any
covenant or condition contained in this Agreement or in any Rights Certificate;
nor shall it be responsible for any change in the exercisability of the Rights
or any adjustment in the terms of the Rights (including the manner, method or
amount thereof) provided for in Sections 3, 11, 13, 23 or 24, or the
ascertaining of the existence of facts that would require any such change or
adjustment (except with respect to the

                                      -25-
<PAGE>   29
exercise of Rights evidenced by Rights Certificates after receipt by the Rights
Agent of a certificate furnished pursuant to Section 12 describing such change
or adjustment); nor shall it by any act hereunder be deemed to make any
representation or warranty as to the authorization or reservation of any Common
Shares to be issued pursuant to this Agreement or any Rights Certificate or as
to whether any Common Shares will, when issued, be validly authorized and
issued, fully paid and nonassessable.

         (f)      The Company agrees that it will perform, execute, acknowledge
and deliver or cause to be performed, executed, acknowledged and delivered all
such further and other acts, instruments and assurances as may reasonably be
required by the Rights Agent for the carrying out or performing by the Rights
Agent of the provisions of this Agreement.

         (g)      The Rights Agent is hereby authorized and directed to accept
instructions with respect to the performance of its duties hereunder from any
one of the Chairman of the Board, the Chief Executive Officer, the President,
any Vice President, the Chief Financial Officer, the Secretary or any Assistant
Secretary of the Company, and to apply to such officers for advice or
instructions in connection with its duties, and it shall not be liable for any
action taken or suffered by it in good faith in accordance with instructions of
any such officer or for any delay in acting while waiting for those
instructions. Any application by the Rights Agent for written instructions from
the Company may, at the option of the Rights Agent, set forth in writing any
action proposed to be taken or omitted by the Rights Agent under this Agreement
and the date on and/or after which such action shall be taken or such omission
shall be effective. The Rights Agent shall not be liable for any action taken
by, or omission of, the Rights Agent in accordance with a proposal included in
any such application on or after the date specified in such application (which
date shall not be less than five (5) Business Days after the date any officer of
the Company actually receives such application, unless any such officer shall
have consented in writing to an earlier date) unless, prior to taking any such
action (or the effective date in the case of an omission), the Rights Agent
shall have received written instructions in response to such application
specifying the action to be taken or omitted.

         (h)      The Rights Agent and any stockholder, director, officer or
employee of the Rights Agent may buy, sell or deal in any of the Rights or other
securities of the Company or become pecuniarily interested in any transaction in
which the Company may be interested, or contract with or lend money to the
Company or otherwise act as fully and freely as though it were not Rights Agent
under this Agreement. Nothing herein shall preclude the Rights Agent from acting
in any other capacity for the Company or for any other legal entity.

         (i)      The Rights Agent may execute and exercise any of the rights or
powers hereby vested in it or perform any duty hereunder either itself or by or
through its attorneys or agents, and the Rights Agent shall not be answerable or
accountable for any act, default, neglect or misconduct of any such attorneys or
agents or for any loss to the Company resulting from any such act, default,
neglect or misconduct, provided reasonable care was exercised in the selection
and continued employment thereof.

                                      -26-
<PAGE>   30
         (j)      No provision of this Agreement shall require the Rights Agent
to expend or risk its own funds or otherwise incur any financial liability in
the performance of any of its duties hereunder or in the exercise of its rights
if there shall be reasonable grounds for believing that repayment of such funds
or adequate indemnification against such risk or liability is not reasonably
assured to it.

         (k)      If, with respect to any Rights Certificate surrendered to the
Rights Agent for exercise or transfer, the certificate attached to the form of
assignment or form of election to purchase, as the case may be, has either not
been completed or indicates an affirmative response to clause 1 and/or 2
thereof, the Rights Agent shall not take any further action with respect to such
requested exercise or transfer without first consulting with the Company.

         Section 21. CHANGE OF RIGHTS AGENT. The Rights Agent or any successor
Rights Agent may resign and be discharged from its duties under this Agreement
upon thirty (30) days' notice in writing mailed to the Company and to each
transfer agent of the Common Shares by registered or certified mail, and to the
holders of the Rights Certificates by first-class mail. The Company may remove
the Rights Agent or any successor Rights Agent upon thirty (30) days' notice in
writing, mailed to the Rights Agent or successor Rights Agent, as the case may
be, and to each transfer agent of the Common Shares by registered or certified
mail, and to the holders of the Rights Certificates by first-class mail. If the
Rights Agent shall resign or be removed or shall otherwise become incapable of
acting, the Company shall appoint a successor to the Rights Agent. If the
Company shall fail to make such appointment within a period of thirty (30) days
after giving notice of such removal or after it has been notified in writing of
such resignation or incapacity by the resigning or incapacitated Rights Agent or
by the holder of a Rights Certificate (who shall, with such notice, submit his
or her Rights Certificate for inspection by the Company), then the registered
holder of any Rights Certificate may apply to any court of competent
jurisdiction for the appointment of a new Rights Agent. Any successor Rights
Agent, whether appointed by the Company or by such a court, shall be a
corporation organized and doing business under the laws of the United States or
of any state of the United States, in good standing, which is authorized under
such laws to exercise corporate trust or stockholder services powers and is
subject to supervision or examination by federal or state authority and which
has at the time of its appointment as Rights Agent a combined capital and
surplus of at least $50 million. After appointment, the successor Rights Agent
shall be vested with the same powers, rights, duties and responsibilities as if
it had been originally named as Rights Agent without further act or deed; but
the predecessor Rights Agent shall deliver and transfer to the successor Rights
Agent any property at the time held by it hereunder, and execute and deliver any
further assurance, conveyance, act or deed necessary for the purpose. Not later
than the effective date of any such appointment, the Company shall file notice
thereof in writing with the predecessor Rights Agent and each transfer agent of
the Common Shares, and mail a notice thereof in writing to the registered
holders of the Rights Certificates. Failure to give any notice provided for in
this Section 21, however, or any defect therein, shall not affect the legality
or validity of the resignation or removal of the Rights Agent or the appointment
of the successor Rights Agent, as the case may be.

         Section 22. ISSUANCE OF NEW RIGHTS CERTIFICATES. Notwithstanding any of
the provisions of this Agreement or of the Rights to the contrary, the Company
may, at its option, issue new Rights

                                      -27-
<PAGE>   31
Certificates evidencing Rights in such form as may be approved by its Board of
Directors to reflect any adjustment or change in the Purchase Price and the
number or kind or class of shares or other securities or property purchasable
under the Rights Certificates made in accordance with the provisions of this
Agreement. In addition, in connection with the issuance or sale of Common Shares
following the Distribution Date and prior to the redemption or expiration of the
Rights, the Company (a) shall, with respect to Common Shares so issued or sold
pursuant to the exercise of stock options or under any employee plan or
arrangement or upon the exercise, conversion or exchange of any convertible
subordinated debentures of the Company outstanding at the date hereof or upon
the exercise, conversion or exchange of securities hereinafter issued by the
Company and (b) may, in any other case, if deemed necessary or appropriate by
the Board of Directors of the Company, issue Rights Certificates representing
the appropriate number of Rights in connection with such issuance or sale;
provided, however, that (i) no such Rights Certificate shall be issued and this
sentence shall be null and void ab initio if, and to the extent that, such
issuance or this sentence would create a significant risk of or result in
material adverse tax consequences to the Company or the Person to whom such
Rights Certificate would be issued or would create a significant risk of or
result in such options' or employee plans' or arrangements' failing to qualify
for otherwise available special tax treatment and (ii) no such Rights
Certificate shall be issued if, and to the extent that, appropriate adjustment
shall otherwise have been made in lieu of the issuance thereof.

         Section 23. REDEMPTION.

         (a)      The Company may, at its option and with the approval of the
Board of Directors, at any time prior to the Close of Business on the earlier of
(i) the tenth day following the Shares Acquisition Date or such later date as
may be determined by action of a majority of Continuing Directors then in office
and publicly announced by the Company or (ii) the Final Expiration Date, redeem
all but not less than all the then outstanding Rights at a redemption price of
$.001 per Right, appropriately adjusted to reflect any stock split, stock
dividend or similar transaction occurring after the date hereof (such redemption
price being herein referred to as the "Redemption Price") and the Company may,
at its option, pay the Redemption Price either in Common Shares (based on the
current per share market price thereof (as determined pursuant to Section 11(d)
hereof) at the time of redemption) or cash (with such cash amount payable to
each holder of Rights to be rounded up to the nearest whole cent on a
holder-by-holder basis); provided, however, if the Board of Directors of the
Company authorizes redemption of the Rights in either of the circumstances set
forth in clauses (i) and (ii) below, then there must be Continuing Directors
then in office and such authorization shall require the concurrence of a
majority of such Continuing Directors: (i) such authorization occurs on or after
the time a Person becomes an Acquiring Person or (ii) such authorization occurs
on or after the date of a change (resulting from a proxy or consent
solicitation) in a majority of the directors in office at the commencement of
such solicitation if any Person who is a participant in such solicitation has
stated (or, if upon the commencement of such solicitation, a majority of the
Board of Directors of the Company has determined in good faith) that such Person
(or any of its Affiliates or Associates) intends to take, or may consider
taking, any action that would result in such Person becoming an Acquiring Person
or that would cause the occurrence of a Triggering Event.

                                      -28-
<PAGE>   32
         (b)      At any time after the Shares Acquisition Date but prior to the
Close of Business on the earlier of the Control Date (as defined below) or the
Final Expiration Date, the Company may elect to redeem all but not less than all
of the then outstanding Rights at the Redemption Price if (i) such redemption is
in connection with an event set forth in Section 13(a); (ii) no Acquiring Person
who has been such for less than three (3) years, and no Affiliate or Associate
of such an Acquiring Person (other than the Company), is a constituent entity to
such an event and (iii) such redemption is approved both by (x) the Company's
Board of Directors under applicable law and the Company's Certificate of
Incorporation and Bylaws as then in effect and (y) a majority of the Continuing
Directors. As used herein, "Control Date" shall mean the date on which either
(i) any Person becomes the Beneficial Owner of 50% or more of the issued and
outstanding Common Stock or (ii) Continuing Directors no longer constitute a
majority of the Company's Board of Directors.

         (c)      In the event that, following the occurrence of a Shares
Acquisition Date and following the expiration of the right of redemption under
subparagraph (a) of this Section 23, (i) a person who is an Acquiring Person
shall have transferred or otherwise disposed of a number of Common Shares in one
transaction, or a series of transactions (not directly or indirectly involving a
purchase by the Company or any of its Subsidiaries), such that such person is
thereafter a Beneficial Owner of 10% or less of the outstanding Common Shares of
the Company, (ii) there are no other Persons, immediately following the
occurrence of the event described in clause (i), who are Acquiring Persons and
(iii) there are Continuing Directors then in office, then the right of
redemption provided in subparagraph (a) of this Section 23 may be reinstated by
the Board of Directors, with the concurrence of a majority of such Continuing
Directors, and thereafter all outstanding Rights shall again be subject to the
provisions of this Section 23.

         (d)      Immediately upon the action of the Board of Directors of the
Company ordering the redemption of the Rights, evidence of which shall have been
filed with the Rights Agent, and without any further action and without any
notice, the right to exercise the Rights will terminate and the only right
thereafter of the holders of Rights shall be to receive the Redemption Price.
The Company shall promptly give public notice of any such redemption; provided,
however, that the failure to give, or any defect in, any such notice shall not
affect the validity of such redemption. Within ten (10) days after the action of
the Board of Directors ordering the redemption of the Rights, the Company shall
give notice of such redemption to the Rights Agent and the holders of the then
outstanding Rights by mailing such notice to all such holders at their last
addresses as they appear upon the registry books of the Rights Agent or, prior
to the Distribution Date, on the registry books of the transfer agent for the
Common Shares. Any notice which is mailed in the manner herein provided shall be
deemed given, whether or not the holder receives the notice. Each such notice of
redemption will state the method by which the payment of the Redemption Price
will be made. Neither the Company nor any of its Affiliates or Associates may
redeem, acquire or purchase for value any Rights at any time in any manner other
than that specifically set forth in this Section 23, and other than in
connection with the purchase of Common Shares prior to the Distribution Date.

                                      -29-
<PAGE>   33
         Section 24. EXCHANGE.

         (a)      Subject to applicable laws, rules and regulations, and subject
to subsection (c) below, the Company may, at its option, by majority vote of the
Continuing Directors, at any time after the occurrence of a Triggering Event,
exchange all or part of the then outstanding and exercisable Rights (which shall
not include Rights that have become void pursuant to the provisions of Section
7(e) hereof) for Common Shares at an exchange ratio of one (1) Common Share per
Right, appropriately adjusted to reflect any stock split, stock dividend or
similar transaction occurring after the date hereof (such exchange ratio being
hereinafter referred to as the "Ratio of Exchange"). Notwithstanding the
foregoing, the Continuing Directors shall not be empowered to effect such
exchange at any time after any Person (other than the Company, any Subsidiary of
the Company, any employee benefit plan of the Company or any such Subsidiary, or
any entity holding Common Shares for or pursuant to the terms of any such plan),
together with all Affiliates and Associates of such Person, becomes the
Beneficial Owner of 50% or more of the Common Shares then outstanding.

         (b)      Immediately upon the action of the Continuing Directors
ordering the exchange of any Rights pursuant to subsection (a) of this Section
24 and without any further action and without any notice, the right to exercise
such Rights shall terminate and the only right thereafter of a holder of such
Rights shall be to receive that number of Common Shares equal to the number of
such Rights held by such holder multiplied by the Ratio of Exchange. The Company
shall give public notice of any such exchange; provided, however, that the
failure to give, or any defect in, such notice shall not affect the validity of
such exchange. The Company shall mail a notice of any such exchange to all of
the holders of such Rights at their last addresses as they appear upon the
registry books of the Rights Agent. Any notice which is mailed in the manner
herein provided shall be deemed given, whether or not the holder receives the
notice. Each such notice of exchange will state the method by which the exchange
of the Common Shares for Rights will be effected and, in the event of any
partial exchange, the number of Rights which will be exchanged. Any partial
exchange shall be effected pro rata based on the number of Rights (other than
Rights which have become void pursuant to the provisions of Section 7(e) hereof)
held by each holder of Rights.

         (c)      In the event that there shall not be sufficient Common Shares
issued but not outstanding or authorized but unissued to permit any exchange of
Rights as contemplated in accordance with Section 24(a), the Company shall
either take such action as may be necessary to authorize additional Common
Shares for issuance upon exchange of the Rights or alternatively, at the option
of a majority of the Continuing Directors, with respect to each Right (i) pay
cash in an amount equal to the Purchase Price, in lieu of issuing Common Shares
in exchange therefor, or (ii) issue debt or equity securities or a combination
thereof, having a value equal to the Current Value of the Common Shares (as
hereinafter defined) exchangeable for each such Right, where the value of such
securities shall be determined by a nationally recognized investment banking
firm selected by the Board of Directors by majority vote of the Board of
Directors, or (iii) deliver any combination of cash, property, Common Shares
and/or other securities having a value equal to the Current Value in exchange
for each Right. For purposes of this Section 24(c) only, "Current Value" shall
mean the product of the current per share market price of Common Shares
(determined pursuant to Section 11(d) on the date of the occurrence of the event
described above in subparagraph (a)) multiplied by

                                      -30-
<PAGE>   34
the number of Common Shares for which the Right otherwise would be exchangeable
if there were sufficient shares available. To the extent that the Company
determines that some action need be taken pursuant to clauses (i), (ii) or (iii)
of this Section 24(c), the Continuing Directors may temporarily suspend the
exercisability of the Rights for a period of up to sixty (60) days following the
date on which the event described in Section 24(a) shall have occurred, in order
to seek any authorization of additional Common Shares and/or to decide the
appropriate form of distribution to be made pursuant to the above provision and
to determine the value thereof. In the event of any such suspension, the Company
shall issue a public announcement stating that the exercisability of the Rights
has been temporarily suspended.

         (d)      The Company shall not be required to issue fractions of Common
Shares or to distribute certificates which evidence fractional Common Shares. In
lieu of such fractional Common Shares, there shall be paid to the registered
holders of the Rights Certificates with regard to which such fractional Common
Shares would otherwise be issuable, an amount in cash equal to the same fraction
of the current per share market value of a whole Common Share (as determined
pursuant to the second sentence of Section 11(d) hereof).

         (e)      The Company may, at its option, by majority vote of the Board
of Directors, at any time before any Person has become an Acquiring Person,
exchange all or part of the then outstanding Rights for rights of substantially
equivalent value, as determined reasonably and with good faith by the Board of
Directors, based upon the advice of one or more nationally recognized investment
banking firms.

         (f)      Immediately upon the action of the Board of Directors ordering
the exchange of any Rights pursuant to subsection (e) of this Section 24 and
without any further action and without any notice, the right to exercise such
Rights shall terminate and the only right thereafter of a holder of such Rights
shall be to receive that number of rights in exchange therefor as has been
determined by the Board of Directors in accordance with subsection (e) above.
The Company shall give public notice of any such exchange; provided, however,
that the failure to give, or any defect in, such notice shall not affect the
validity of such exchange. The Company shall mail a notice of any such exchange
to all of the holders of such Rights at their last addresses as they appear upon
the registry books of the transfer agent for the Common Shares of the Company.
Any notice which is mailed in the manner herein provided shall be deemed given,
whether or not the holder receives the notice. Each such notice of exchange will
state the method by which the exchange of the Rights will be effected.

         Section 25. NOTICE OF CERTAIN EVENTS.

         (a)      In case the Company shall propose to take an action described
at Section 7(b), 11(a)(i), 11(b) or 11(c) hereof or to effect a Section 13
Event, the Company shall give notice thereof to each holder of Rights in
accordance with Section 26 hereof at least ten (10) days prior to the record
date, if applicable, of such action or, in the case of a Section 13 Event, at
least 10 days prior to the occurrence of such Section 13 Event.

                                      -31-
<PAGE>   35
         (b)      In case any Triggering Event or Section 13 Event shall occur,
then, in any such case, the Company shall as soon as practicable thereafter give
to each holder of a Rights Certificate, in accordance with Section 26 hereof, a
notice of the occurrence of such event, which shall specify the event and the
consequences of the event to holders of Rights under Sections 11(a)(ii) and 13
hereof.

         Section 26. NOTICES. Notices or demands authorized by this Agreement to
be given or made by the Rights Agent or by the holder of any Rights Certificate
to or on the Company shall be sufficiently given or made if sent by first-class
mail, postage prepaid, addressed (until another address is filed in writing with
the Rights Agent) as follows:

                        Octel Communications Corporation
                        1001 Murphy Ranch Road
                        Milpitas, California 95035-7912
                        Attention: Chief Financial Officer

Subject to the provisions of Section 21 hereof, any notice or demand authorized
by this Agreement to be given or made by the Company or by the holder of any
Rights Certificate to or on the Rights Agent shall be sufficiently given or made
if sent by first-class mail, postage prepaid, addressed (until another address
is filed in writing with the Company) as follows:

                        The First National Bank of Boston
                        435 Tasso St.
                        Suite 250
                        Palo Alto, CA 94301
                        Attention: Geoff Anderson

Notices or demands authorized by this Agreement to be given or made by the
Company or the Rights Agent to the holder of any Rights Certificate shall be
sufficiently given or made if sent by first-class mail, postage prepaid,
addressed to such holder at the address of such holder as shown on the registry
books of the Company.

         Section 27. SUPPLEMENTS AND AMENDMENTS. Prior to the Distribution Date,
the Company may supplement or amend this Agreement in any respect without the
approval of any holders of Rights and the Rights Agent shall, if the Company so
directs, execute such supplement or amendment. From and after the Distribution
Date, the Company and the Rights Agent may from time to time supplement or amend
this Agreement without the approval of any holders of Rights in order to (i)
cure any ambiguity, (ii) correct or supplement any provision contained herein
which may be defective or inconsistent with any other provisions herein, (iii)
shorten or lengthen any time period hereunder (which lengthening or shortening,
following the first occurrence of an event set forth in clauses (i) and (ii) of
the proviso to Section 23(a) hereof, shall be effective only if there are
Continuing Directors and shall require the concurrence of a majority of such
Continuing Directors) or (iv) to change or supplement the provisions hereunder
in any manner that the Company may deem necessary or desirable and that shall
not adversely affect the interests of the holders of Rights (other

                                      -32-
<PAGE>   36
than an Acquiring Person or an Affiliate or Associate of an Acquiring Person);
provided, this Agreement may not be supplemented or amended to lengthen,
pursuant to clause (iii) of this sentence, (A) a time period relating to when
the Rights may be redeemed at such time as the Rights are not then redeemable or
(B) any other time period unless such lengthening is for the purpose of
protecting, enhancing or clarifying the rights of, and/or the benefits to, the
holders of Rights. Upon the delivery of a certificate from an appropriate
officer of the Company that states that the proposed supplement or amendment is
in compliance with the terms of this Section 27, the Rights Agent shall execute
such supplement or amendment. Prior to the Distribution Date, the interests of
the holders of Rights shall be deemed coincident with the interests of the
holders of Common Shares.

         Section 28. SUCCESSORS. All the covenants and provisions of this
Agreement by or for the benefit of the Company or the Rights Agent shall bind
and inure to the benefit of their respective successors and assigns hereunder.

         Section 29. DETERMINATIONS AND ACTIONS BY THE BOARD OF DIRECTORS, ETC.
For all purposes of this Agreement, any calculation of the number of Common
Shares outstanding at any particular time, including for purposes of determining
the particular percentage of such outstanding Common Shares of which any Person
is the Beneficial Owner, shall be made in accordance with the last sentence of
Rule 13d-3(d)(1)(i) of the General Rules and Regulations under the Exchange Act.
The Board of Directors of the Company (and, where specifically provided for
herein, the Continuing Directors) shall have the exclusive power and authority
to administer this Agreement and to exercise all rights and powers specifically
granted to the Board, or the Company (or, where specifically provided for
herein, the Continuing Directors), or as may be necessary or advisable in the
administration of this Agreement, including, without limitation, the right and
power to (i) interpret the provisions of this Agreement and (ii) make all
determinations deemed necessary or advisable for the administration of this
Agreement (including a determination to redeem or not redeem the Rights or to
amend the Agreement). All such actions, calculations, interpretations and
determinations (including, for purposes of clause (y) below, all omissions with
respect to the foregoing) which are done or made by the Board (or, where
specifically provided for herein, by the Continuing Directors) in good faith,
shall (x) be final, conclusive and binding on the Company, the Rights Agent, the
holders of the Rights Certificates and all other parties and (y) not subject the
Board or the Continuing Directors to any liability to the holders of the Rights.

         Section 30. BENEFITS OF THIS AGREEMENT. Nothing in this Agreement shall
be construed to give to any Person other than the Company, the Rights Agent and
the registered holders of the Rights Certificates (and, prior to the
Distribution Date, the Common Shares) any legal or equitable right, remedy or
claim under this Agreement; but this Agreement shall be for the sole and
exclusive benefit of the Company, the Rights Agent and the registered holders of
the Rights Certificates (and, prior to the Distribution Date, the Common
Shares).

         Section 31. SEVERABILITY. If any term, provision, covenant or
restriction of this Agreement is held by a court of competent jurisdiction or
other authority to be invalid, void or unenforceable, the remainder of the
terms, provisions, covenants and restrictions of this Agreement shall remain in
full force and effect and shall in no way be affected, impaired or invalidated;
provided, however, that

                                      -33-
<PAGE>   37
notwithstanding anything in this Agreement to the contrary, if any such term,
provision, covenant or restriction is held by such court or authority to be
invalid, void or unenforceable and the Board of Directors of the Company
determines in its good faith judgment that severing the invalid language from
this Agreement would adversely affect the purpose or effect of this Agreement,
the right of redemption set forth in Section 23 hereof shall be reinstated and
shall not expire until the close of business on the tenth day following the date
of such determination by the Board of Directors.

         Section 32. GOVERNING LAW. This Agreement and each Right and each
Rights Certificate issued hereunder shall be deemed to be a contract made under
the laws of the State of Delaware and for all purposes shall be governed by and
construed in accordance with the laws of such State applicable to contracts to
be made and performed entirely within such State.

         Section 33. COUNTERPARTS. This Agreement may be executed in any number
of counterparts and each of such counterparts shall for all purposes be deemed
to be an original, and all such counterparts shall together constitute but one
and the same instrument.

         Section 34. DESCRIPTIVE HEADINGS. Descriptive headings of the several
Sections of this Agreement are inserted for convenience only and shall not
control or affect the meaning or construction of any of the provisions hereof.

                                      -34-
<PAGE>   38
         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first above written.

                                   OCTEL COMMUNICATIONS CORPORATION


                                   By:  /s/ Derek S. Daley
                                      ------------------------------------------
                                   Name: Derek S. Daley
                                         ---------------------------------------
                                   Title: VP, General Counsel & Secretary
                                         ---------------------------------------


                                   THE FIRST NATIONAL BANK OF BOSTON


                                   By: /s/ Geoffrey D. Anderson
                                       -----------------------------------------
                                   Name: Geoffrey D. Anderson
                                         ---------------------------------------
                                   Title:  Senior Account Manager
                                         ---------------------------------------

                                      -35-
<PAGE>   39
                                    EXHIBIT A

                           FORM OF RIGHTS CERTIFICATE


Certificate No. R-                                                _____ Rights

                  NOT EXERCISABLE AFTER AUGUST 29, 2006 OR EARLIER IF 
                  TERMINATED BY THE COMPANY OR IF THE COMPANY EXCHANGES THE 
                  RIGHTS PURSUANT TO THE RIGHTS AGREEMENT. THE RIGHTS ARE 
                  SUBJECT TO REDEMPTION, AT THE OPTION OF THE COMPANY, AT $.01 
                  PER RIGHT ON THE TERMS SET FORTH IN THE RIGHTS AGREEMENT. 
                  UNDER CERTAIN CIRCUMSTANCES, RIGHTS BENEFICIALLY OWNED BY AN 
                  ACQUIRING PERSON OR AN AFFILIATE OR ASSOCIATE OF AN ACQUIRING
                  PERSON (AS SUCH TERMS ARE DEFINED IN THE RIGHTS AGREEMENT) 
                  AND ANY SUBSEQUENT HOLDER OF SUCH RIGHTS MAY BECOME NULL AND 
                  VOID. [THE RIGHTS REPRESENTED BY THIS RIGHTS CERTIFICATE ARE 
                  OR WERE BENEFICIALLY OWNED BY A PERSON WHO WAS OR BECAME AN 
                  ACQUIRING PERSON OR AN AFFILIATE OR ASSOCIATE OF AN ACQUIRING
                  PERSON (AS SUCH TERMS ARE DEFINED IN THE RIGHTS AGREEMENT). 
                  ACCORDINGLY, THIS RIGHTS CERTIFICATE AND THE RIGHTS 
                  REPRESENTED HEREBY MAY BECOME NULL AND VOID IN THE 
                  CIRCUMSTANCES SPECIFIED IN SECTION 7(e) OF SUCH RIGHTS 
                  AGREEMENT.]*


                               Rights Certificate

                               __________________


                  This certifies that ______________________, or registered
assigns, is the registered owner of the number of Rights set forth above, each
of which entitles the owner thereof, subject to the terms, provisions and
conditions of the First Amended and Restated Common Shares Rights Agreement
dated as of August 29, 1996 (the "RIGHTS AGREEMENT"), between Octel
Communications Corporation, a Delaware corporation (the "COMPANY"), and The
First National Bank of Boston (the "RIGHTS AGENT") to purchase from the Company
at any time after the Distribution Date (as such term is defined in the Rights
Agreement) and prior to 5:00 p.m., New York time, on August 29, 2006 at the
office of the Rights Agent designated for such purpose, or at the office of its
successor as Rights

________________

*        The portion of the legend in brackets shall be
         inserted only if applicable and shall replace the
         sentence immediately preceding it.
<PAGE>   40
Agent, one fully paid and nonassessable share of Common Stock, par value $.001
per share, (the "COMMON SHARES"), of the Company, at a purchase price of $100.00
per Common Share (the "PURCHASE PRICE"), upon presentation and surrender of this
Rights Certificate with the Form of Election to Purchase and related Certificate
duly executed. The number of Rights evidenced by this Rights Certificate (and
the number of Common Shares which may be purchased upon exercise hereof) set
forth above are the number and Purchase Price as of August 29, 1996, based on
the Common Shares as constituted at such date. As provided in the Rights
Agreement, the Purchase Price and the number and kind of Common Shares or other
securities which may be purchased upon the exercise of the Rights evidenced by
this Rights Certificate are subject to modification and adjustment upon the
happening of certain events.

                  This Rights Certificate is subject to all of the terms,
provisions and conditions of the Rights Agreement, which terms, provisions and
conditions are hereby incorporated by reference and made a part hereof.
Reference is made to the Rights Agreement for a full description of the rights,
limitations of rights, obligations, duties and immunities hereunder of the
Rights Agent, the Company and the holders of the Rights Certificates, which
limitations of rights include the temporary suspension of the exercisability of
such Rights under the specific circumstances set forth in the Rights Agreement.
Copies of the Rights Agreement are on file at the principal executive offices of
the Company and the above-mentioned office of the Rights Agent.

                  Subject to the provisions of the Rights Agreement, the Rights
evidenced by this Rights Certificate (i) may be redeemed by the Company, at its
option, at a redemption price of $.01 per Right or (ii) may be exchanged by the
Company in whole or in part for Common Shares, substantially equivalent rights
or other consideration as determined by the Company.

                  This Rights Certificate, with or without other Rights
Certificates, upon surrender at the office of the Rights Agent designated for
such purpose, may be exchanged for another Rights Certificate or Rights
Certificates of like tenor and date evidencing Rights entitling the holder to
purchase a like aggregate amount of securities as the Rights evidenced by the
Rights Certificate or Rights Certificates surrendered shall have entitled such
holder to purchase. If this Rights Certificate shall be exercised in part, the
holder shall be entitled to receive upon surrender hereof another Rights
Certificate or Rights Certificates for the number of whole Rights not exercised.

                  No fractional portion of a Common Share will be issued upon
the exercise of any Right or Rights evidenced hereby but in lieu thereof a cash
payment will be made, as provided in the Rights Agreement.

                  No holder of this Rights Certificate, as such, shall be
entitled to vote or receive dividends or be deemed for any purpose the holder of
the Common Shares or of any other securities of the Company which may at any
time be issuable on the exercise hereof, nor shall anything contained in the
Rights Agreement or herein be construed to confer upon the holder hereof, as
such, any of the rights of a stockholder of the Company or any right to vote for
the election of directors or upon any matter submitted to stockholders at any
meeting thereof, or to give or withhold consent to any corporate action, or to
receive notice of meetings or other actions affecting stockholders (except

                                       -2-
<PAGE>   41
as provided in the Rights Agreement), or to receive dividends or subscription
rights, or otherwise, until the Right or Rights evidenced by this Rights
Certificate shall have been exercised as provided in the Rights Agreement.

                  This Rights Certificate shall not be valid or obligatory for
any purpose until it shall have been countersigned by the Rights Agent.

                  WITNESS the facsimile signature of the proper officers of the
Company and its corporate seal. Dated as of ___________, ____.

ATTEST:                            OCTEL COMMUNICATIONS CORPORATION

_____________________________      By:_____________________________
Secretary                                     President


Countersigned:

THE FIRST NATIONAL BANK OF BOSTON



By:__________________________
   Authorized Signature

                                       -3-
<PAGE>   42
                  (Form of Reverse Side of Rights Certificate)


                               FORM OF ASSIGNMENT

                (To be executed by the registered holder if such
               holder desires to transfer the Rights Certificate)


                  FOR VALUE RECEIVED _____________________________________

hereby sells, assigns and transfers unto _________________________

________________________________________________________________________________
                  (Please print name and address of transferee)

________________________________________________________________________________
this Rights Certificate, together with all right, title and interest therein,
and does hereby irrevocably constitute and appoint __________________________
Attorney, to transfer the within Rights Certificate on the books of the
within-named Company, with full power of substitution.


Dated: ____________________________, ____


                                                  ______________________________
                                                  Signature


Signature Guaranteed:

                  Signatures must be guaranteed by a member firm of a registered
national securities exchange, a member of the National Association of Securities
Dealers, Inc., or a commercial bank or trust company having an office or
correspondent in the United States.
<PAGE>   43
                         CERTIFICATE REGARDING TRANSFER

                  The undersigned hereby certifies by checking the appropriate
boxes that:

                  (1)      this Rights Certificate [ ] is [ ] is not being sold,
assigned and transferred by or on behalf of a Person who is or was an Acquiring
Person, or an Affiliate or Associate of any such Person (as such terms are
defined in the Rights Agreement);

                  (2)      after due inquiry and to the best knowledge of the
undersigned, it [ ] did [ ] did not acquire the Rights evidenced by this Rights
Certificate from any Person who is, was or subsequently became an Acquiring
Person or an Affiliate or Associate of any such Person.

Dated:   _______________________, _____


                                              ________________________________
                                              Signature

Signature Guaranteed:

                  Signatures must be guaranteed by a member firm of a registered
national securities exchange, a member of the National Association of Securities
Dealers, Inc., or a commercial bank or trust company having an office or
correspondent in the United States.
<PAGE>   44
             (Form of Reverse Side of Rights Certificate--continued)

                          FORM OF ELECTION TO PURCHASE

                      (To be executed if holder desires to
                        exercise the Rights Certificate)

To:  ___________________________

                  The undersigned hereby irrevocably elects to exercise
_________________________________ Rights represented by this Rights Certificate
to purchase the number of Common Shares issuable upon the exercise of such
Rights and requests that certificates for such number of Common Shares issued in
the name of:

Please insert social security
or other identifying number


_______________________________________________________________________________
                         (Please print name and address)

_______________________________________________________________________________

If such number of Rights shall not be all the Rights evidenced by this Rights
Certificate, a new Rights Certificate for the balance remaining of such Rights
shall be registered in the name of and delivered to:

Please insert social security
or other identifying number


_______________________________________________________________________________
                         (Please print name and address)


_______________________________________________________________________________


Dated: ____________________________ , ____


                                              _________________________________
                                              Signature

Signature Guaranteed:
<PAGE>   45
                  Signatures must be guaranteed by a member firm of a registered
national securities exchange, a member of the National Association of Securities
Dealers, Inc., or a commercial bank or trust company having an office or
correspondent in the United States.
<PAGE>   46
                         CERTIFICATE REGARDING EXERCISE


         The undersigned hereby certifies by checking the appropriate boxes
that:

                  (1)      the Rights evidenced by this Rights Certificate [ ]
are [ ] are not being exercised by or on behalf of a Person who is or was an
Acquiring Person or an Affiliate or Associate of any such Person (as such terms
are defined in the Rights Agreement);

                  (2)      after due inquiry and to the best knowledge of the
undersigned, it [ ] did [ ] did not acquire the Rights evidenced by this Rights
Certificate from any Person who is, was or subsequently became an Acquiring
Person or an Affiliate or Associate of any such Person.

Dated:   _______________________, _____


                                               _________________________________
                                               Signature

Signature Guaranteed:

         Signatures must be guaranteed by a member firm of a registered national
securities exchange, a member of the National Association of Securities Dealers,
Inc., or a commercial bank or trust company having an office or correspondent in
the United States.
<PAGE>   47
             (Form of Reverse Side of Rights Certificate--continued)

                                     NOTICE

         The signature in the foregoing Forms of Assignment and Election must
conform to the name as written upon the face of this Rights Certificate in every
particular, without alteration or enlargement or any change whatsoever.
<PAGE>   48
                                    EXHIBIT B

                        OCTEL COMMUNICATIONS CORPORATION

                             STOCKHOLDER RIGHTS PLAN

                                SUMMARY OF RIGHTS



DISTRIBUTION AND                    The Board of Directors has declared a       
TRANSFER OF RIGHTS;                 dividend of one Right for each share of     
RIGHTS CERTIFICATE:                 Octel Communications Corporation Common     
                                    Stock outstanding. Prior to the Distribution
                                    Date referred to below, the Rights will be  
                                    evidenced by and trade with the certificates
                                    for the Common Stock. After the Distribution
                                    Date, Octel Communications Corporation (the 
                                    "Company") will mail Rights certificates to 
                                    the Company's stockholders and the Rights   
                                    will become transferable apart from the     
                                    Common Stock.                               
                                    
                                    
DISTRIBUTION DATE:                  Rights will separate from the Common Stock  
                                    and become exercisable following the tenth  
                                    day (the "DISTRIBUTION DATE," which may     
                                    instead be such later date as may be        
                                    determined by a majority of the Directors   
                                    not affiliated with the acquiring person or 
                                    group (the "CONTINUING DIRECTORS")) after a 
                                    person or group (a) acquires beneficial     
                                    ownership of 21% or more of the Company's   
                                    Common Stock or (b) announces a tender or   
                                    exchange offer, the consummation of which   
                                    would result in ownership by a person or    
                                    group of 21% or more of the Company's Common
                                    Stock.                                      
                                    
                                    
COMMON STOCK                        After the Distribution Date, each Right will
PURCHASABLE UPON                    entitle the holder to purchase, for $100.00,
EXERCISE OF RIGHTS:                 one share of the Company's Common Stock.    
                                   

                             
FLIP-IN:                            If an acquiror (an "ACQUIRING PERSON")
                                    obtains 21% or more of the Company's Common
                                    Stock (other than pursuant to a tender offer
                                    deemed fair by the Continuing Directors (a
                                    "Permitted Offer")), then each Right (other
                                    than Rights owned by an Acquiring Person or
                                    its affiliates) will entitle the holder
                                    thereof to purchase, for the exercise price,
                                    a number of shares of the Company's Common
                                    Stock having a then current market value of
                                    twice the exercise price.

FLIP-OVER:                          If, after the Shares Acquisition Date
                                    (defined below), (a) the Company merges into
                                    another entity, (b) an acquiring entity
                                    merges into the Company or (c) the Company
                                    sells more than 50% of the Company's assets
                                    or earning power, then each Right (other
                                    than Rights owned by an Acquiring Person or
                                    its affiliates) will entitle the holder
                                    thereof to
<PAGE>   49
                                    purchase, for the exercise price, a number
                                    of shares of Common Stock of the person
                                    engaging in the transaction having a then
                                    current market value of twice the exercise
                                    price (unless the transaction satisfies
                                    certain conditions and is consummated with a
                                    person who acquired shares pursuant to a
                                    Permitted Offer, in which case the Rights
                                    will expire).

EXCHANGE PROVISION:                 At any time after an event triggering the
                                    flip-in or flip-over rights and prior to the
                                    acquisition by the Acquiring Person of 50%
                                    or more of the outstanding Common Stock, the
                                    Continuing Directors of the Company may
                                    exchange the Rights (other than Rights owned
                                    by the Acquiring Person or its affiliates),
                                    in whole or in part, at an exchange ratio of
                                    one Common Share per Right (subject to
                                    adjustment).

REDEMPTION OF                       Rights will be redeemable at the Company's  
THE RIGHTS:                         option for $.01 per Right at any time on or 
                                    prior to the tenth day (or such later date  
                                    as may be determined by a majority of the   
                                    Continuing Directors) after public          
                                    announcement that a person has acquired     
                                    beneficial ownership of 21% or more of the  
                                    Company's Common Stock (the "Shares         
                                    Acquisition Date").                         
                                                                                
                                    
WHITE KNIGHT                        Rights will also be redeemable at the       
PROVISION:                          Company's option following the Shares       
                                    Acquisition Date if (a) such redemption is  
                                    in connection with a consolidation or merger
                                    in which the Company is not the surviving   
                                    corporation, (b) any Acquiring Person that  
                                    is a party to such consolidation or merger 
                                    has held more than 21% of the Company's     
                                    Common Stock for at least the last three    
                                    years and (c) the redemption is approved by 
                                    a majority of the Continuing Directors.     
                                    
                                    
REINSTATEMENT OF                    The Company's right of redemption may be   
REDEMPTION:                         reinstated if the Acquiring Person reduces 
                                    its beneficial ownership to 10% or less of 
                                    the Company's Common Stock.                
                                    
                                    
EXPIRATION OF                       The Rights expire on the earliest of (a)    
THE RIGHTS:                         August 29, 2006, (b) exchange or redemption 
                                    of the Rights as described above, or (c)    
                                    consummation of a merger, consolidation or  
                                    sale of assets resulting in expiration of   
                                    the Rights as described above.              
                                    
                                    
AMENDMENT OF TERMS                  The terms of the Rights and the Common      
OF RIGHTS:                          Shares Rights Agreement may be amended in   
                                    any respect without the consent of the      
                                    Rights holders on or prior to the           
                                    Distribution Date; thereafter, the terms of 
                                    the Rights and the Common Shares Rights     
                                    Agreement may be amended without the consent
                                    of the Rights holders in order to cure any  

                                       -2-
<PAGE>   50
                                    ambiguities or to make changes which do not
                                    adversely affect the interests of Rights
                                    holders (other than the Acquiring Person).

VOTING RIGHTS:                      Rights will not have any voting rights.

ANTI-DILUTION                       Rights will have the benefit of certain   
PROVISIONS:                         customary anti-dilution provisions.       
                                    
                                    
TAXES:                              The Rights distribution should not be
                                    taxable for federal income tax purposes.
                                    However, following an event which renders
                                    the Rights exercisable or upon redemption of
                                    the Rights, stockholders may recognize
                                    taxable income.

The foregoing is a summary of certain principal terms of the Stockholder Rights
Plan only and is qualified in its entirety by reference to the detailed terms of
the First Amended and Restated Common Shares Rights Agreement dated as of August
29, 1996, between the Company and the Rights Agent.

                                       -2-


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