Document:

<PAGE>

                                                                     EXHIBIT 4.3

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY (55 WATER STREET, NEW YORK, NEW YORK) (THE
"DEPOSITARY", WHICH TERM INCLUDES ANY SUCCESSOR DEPOSITARY FOR THE CERTIFICATES)
TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT,
AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH
OTHER NAME AS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITARY (AND
ANY PAYMENT HEREIN IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED
BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITARY), ANY TRANSFER, PLEDGE, OR
OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH
AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

                           MENTOR GRAPHICS CORPORATION

                  6 7/8% CONVERTIBLE SUBORDINATED NOTE DUE 2007

                                                                CUSIP: 587200AB2

No. R-1                                                             $172,500,000

        Mentor Graphics Corporation, a corporation duly organized and validly
existing under the laws of the State of Oregon (herein called the "COMPANY",
which term includes any successor corporation under the Indenture referred to on
the reverse hereof), for value received hereby promises to pay to Cede & Co., or
registered assigns, the principal sum of one hundred seventy-two million five
hundred thousand dollars ($172,500,000) on June 15, 2007, at the office or
agency of the Company maintained for that purpose in accordance with the terms
of the Indenture, in such coin or currency of the United States of America as at
the time of payment shall be legal tender for the payment of public and private
debts, and to pay interest, semi-annually on June 15 and December 15 of each
year, commencing December 15, 2002, on said principal sum at said office or
agency, in like coin or currency, at the rate per annum of 6 7/8%, from the most
recent date to which interest has been paid or duly provided for, or if no
interest has been paid or duly provided for, from June 3, 2002, until payment of
said principal sum has been made or duly provided for. Except as otherwise
provided in the Indenture, the interest payable on the Note pursuant to the
Indenture on any June 15 or December 15 will be paid to the Person entitled
thereto as it appears in the Note register at the close of business on the
record date, which shall be the June 1 or December 1 (whether or not a Business
Day) next preceding such June 15 or December 15, as provided in the Indenture;
provided, however, that any such interest not punctually paid or duly provided
for shall be payable as provided in the Indenture. Interest may, at the option
of the Company, be paid either (i) by check mailed to the registered address of
such Person (provided that the holder of Notes with an aggregate principal
amount in excess of $5,000,000 shall, at the written election of such holder, be
paid by wire transfer of immediately available funds) or (ii) by transfer to an
account maintained by such Person located in the United States; provided,
however, that payments to the Depositary will be made by wire transfer of
immediately available funds to the account of the Depositary or its nominee.

<PAGE>

        Reference is made to the further provisions of this Note set forth on
the reverse hereof, including, without limitation, provisions subordinating the
payment of principal of and premium, if any, and interest on the Notes to the
prior payment in full of all Senior Debt, as defined in the Indenture, and
provisions giving the holder of this Note the right to convert this Note into
Common Stock of the Company on the terms and subject to the limitations referred
to on the reverse hereof and as more fully specified in the Indenture. Such
further provisions shall for all purposes have the same effect as though fully
set forth at this place.

        This Note shall be deemed to be a contract made under the laws of the
State of New York, and for all purposes shall be construed in accordance with
and governed by the laws of the State of New York, without regard to principles
of conflicts of laws.

        This Note shall not be valid or become obligatory for any purpose until
the certificate of authentication hereon shall have been manually signed by the
Trustee or a duly authorized authenticating agent under the Indenture.

        IN WITNESS WHEREOF, the Company has caused this Note to be duly
executed.

                             MENTOR GRAPHICS CORPORATION

                             By:
                                --------------------------------------
                             Name: Gregory K. Hinckley
                             Title:   President

                             Attest:
                                    ----------------------------------
                             Name: Dean M. Freed
                             Title:   Secretary

Date:  __________, 2002

                                       2
<PAGE>

TRUSTEE'S CERTIFICATE OF AUTHENTICATION

This is one of the Notes described in the within-named Indenture.

WILMINGTON TRUST COMPANY,
as Trustee

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

By:
   -----------------------------
     As Authenticating Agent
     (if different from Trustee)

                                       3
<PAGE>

                             FORM OF REVERSE OF NOTE

                           MENTOR GRAPHICS CORPORATION

                  6 7/8% CONVERTIBLE SUBORDINATED NOTE DUE 2007

        This Note is one of a duly authorized issue of Notes of the Company,
designated as its 6 7/8% Convertible Subordinated Notes Due 2007 (herein called
the "NOTES"), limited to the aggregate principal amount of $172,500,000 all
issued or to be issued under and pursuant to an Indenture dated as of June 3,
2002 (herein called the "INDENTURE"), between the Company and Wilmington Trust
Company, as trustee (herein called the "TRUSTEE"), to which Indenture and all
indentures supplemental thereto reference is hereby made for a description of
the rights, limitations of rights, obligations, duties and immunities thereunder
of the Trustee, the Company and the holders of the Notes.

        In case an Event of Default (as defined in the Indenture) shall have
occurred and be continuing, the principal of, premium, if any, and accrued
interest (including Liquidated Damages (as defined in the Registration Rights
Agreement), if any) on all Notes may be declared by either the Trustee or the
holders of not less than 25% in aggregate principal amount of the Notes then
outstanding, and upon said declaration shall become, due and payable, in the
manner, with the effect and subject to the conditions provided in the Indenture.

        The Indenture contains provisions permitting the Company and the
Trustee, with the consent of the holders of not less than a majority in
aggregate principal amount of the Notes at the time outstanding, to execute
supplemental indentures adding any provisions to or changing in any manner or
eliminating any of the provisions of the Indenture or of any supplemental
indenture or modifying in any manner the rights of the holders of the Notes;
provided, however, that no such supplemental indenture shall (i) extend the
fixed maturity of any Note; (ii) reduce the rate or extend the time of payment
of interest or Liquidated Damages on any Note; (iii) reduce the principal amount
of any Note or premium, if any, thereon, or reduce any amount payable on
redemption or repurchase thereof or reduce the amount of Liquidated Damages
payable thereon; (iv) impair the right of any Noteholder to institute suit for
any payment on a Note or with respect to the conversion of a Note; (v) make the
principal of any Note or interest or premium, if any, or Liquidated Damages on
any Note payable in any coin or currency other than that provided in the Notes;
(vi) modify the provisions of this Indenture with respect to the redemption of
the Notes in a manner adverse to the Noteholders in any material respect; (vii)
change the obligation of the Company to repurchase any Note upon the happening
of a Change of Control in a manner adverse to the holder of Notes; (viii) impair
the right to convert the Notes into Common Stock subject to the terms set forth
herein without the consent of the holder of each Note so affected; (ix) alter
the manner of calculation or rate of accrual of Liquidated Damages on any Note
or extend the time for payment of such amount; or (x) reduce the percentage of
Notes, the holders of which are required to consent to any supplemental
indenture or the percentage of Notes or the holders of which are required for
any other waiver under the Indenture. Subject to the provisions of the
Indenture, the holders of a majority in aggregate principal amount of the Notes
at the time outstanding may on behalf of the holders of all of the Notes waive
any past default or Event of Default under the Indenture and its consequences
except a default in the payment of interest (including Liquidated Damages, if
any) or any premium on, or the principal of, any of the Notes, or a failure by
the Company to convert any Notes into Common Stock of the Company, or a default
in the payment of the redemption price pursuant to Article 3 of the Indenture,
or a default in respect of a covenant or provisions of the Indenture which under
Article 11 of

                                       4
<PAGE>

the Indenture cannot be modified without the consent of the holders of each or
all Notes then outstanding or affected thereby. Any such consent or waiver by
the holder of this Note (unless revoked as provided in the Indenture) shall be
conclusive and binding upon such holder and upon all future holders and owners
of this Note and any Notes which may be issued in exchange or substitution
hereof, irrespective of whether or not any notation thereof is made upon this
Note or such other Notes.

        The indebtedness evidenced by the Notes is, to the extent and in the
manner provided in the Indenture, expressly subordinated and subject in right of
payment to the prior payment in full of all Senior Debt of the Company, whether
outstanding at the date of the Indenture or thereafter incurred, and this Note
is issued subject to the provisions of the Indenture with respect to such
subordination. Each holder of this Note, by accepting the same, agrees to and
shall be bound by such provisions and authorizes the Trustee on its behalf to
take such action as may be necessary or appropriate to effectuate the
subordination so provided and appoints the Trustee his attorney-in-fact for such
purpose.

        No reference herein to the Indenture and no provision of this Note or of
the Indenture shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay the principal of and any premium and interest
(including Liquidated Damages, if any) on this Note at the place, at the
respective times, at the rate and in the coin or currency herein prescribed.

        Interest on the Notes shall be computed on the basis of a 360-day year
of twelve 30-day months.

        The Notes are issuable in fully registered form, without coupons, in
denominations of $1,000 principal amount and any integral multiple of $1,000. At
the office or agency of the Company referred to on the face hereof, and in the
manner and subject to the limitations provided in the Indenture, without payment
of any service charge but with payment of a sum sufficient to cover any tax,
assessment or other governmental charge that may be imposed in connection with
any registration or exchange of Notes, Notes may be exchanged for a like
aggregate principal amount of Notes of any other authorized denominations.

        The Notes will not be redeemable at the option of the Company prior to
June 20, 2005. At any time on or after June 20, 2005, and prior to maturity, the
Notes may be redeemed at the option of the Company, in whole or in part, upon
mailing a notice of such redemption not less than 20 days but not more than 60
days before the date fixed for redemption to the holders of Notes at their last
registered addresses, all as provided in the Indenture, at the following
optional redemption prices (expressed as percentages of the principal amount),
together in each case with accrued and unpaid interest (including Liquidated
Damages, if any) to, but excluding, the date fixed for redemption:

<TABLE>
<CAPTION>
Period                                                          Redemption Price
------                                                          ----------------
<S>                                                             <C>
Beginning on June 20, 2005 and ending on June 14, 2006              102.750%

Beginning on June 15, 2006 and ending on June 14, 2007              101.375%
</TABLE>

and 100% on June 15, 2007; provided, however, that if the date fixed for
redemption is on a June 15 or December 15, then the interest payable on such
date shall be paid to the holder of record on the preceding June 1 or
December 1, respectively.

                                       5
<PAGE>

        The Company may not give notice of any redemption of the Notes if a
default in the payment of interest or premium, if any, on the Notes has occurred
and is continuing.

        The Notes are not subject to redemption through the operation of any
sinking fund.

        If a Change of Control occurs at any time prior to maturity of the
Notes, the holders of the Notes shall have the right to require the Company to
repurchase, at such holders' option, all of such holders' Notes, or any portion
thereof that is an integral multiple of $1,000 principal amount, on the
Repurchase Date (as defined in the Indenture), at a repurchase price equal to
100% of the principal amount thereof, together with accrued interest (and
Liquidated Damages (as defined in the Indenture), if any) to, but excluding, the
date of repurchase; provided, however, that, if such Repurchase Date is a June
15 or December 15, the interest payable on such date shall be paid to the holder
of record of the Notes on the preceding June 1 or December 1, respectively. The
Company shall mail to all holders of record of the Notes a notice of the
occurrence of a Change of Control and of the repurchase right arising as a
result thereof on or before the 10th day after the occurrence of such Change of
Control. For a Note to be so repurchased at the option of the holder, the
Company must receive at the office or agency of the Company maintained for that
purpose in accordance with the terms of the Indenture, such Note with the form
entitled "Option to Elect Repayment Upon a Change of Control" on the reverse
thereof duly completed, together with such Note, duly endorsed for transfer, on
or before the close of business on the Business Day that is five (5) Business
Days prior to the Repurchase Date.

        Subject to the provisions of the Indenture, the holder hereof has the
right, at its option, at any time after the original issuance of any Notes
through the close of business on the final maturity date of the Notes, or, as to
all or any portion hereof called for redemption, prior to the close of business
on the Business Day immediately preceding the date fixed for redemption (unless
the Company shall default in payment due upon redemption thereof), to convert
the principal hereof or any portion of such principal which is $1,000 or an
integral multiple thereof into that number of shares of the Company's Common
Stock (as such shares shall be constituted at the date of conversion) obtained
by dividing the principal amount of this Note or portion thereof to be converted
by the Conversion Price of $23.27, as may adjusted from time to time as provided
in the Indenture, upon surrender of this Note, together with a conversion notice
as provided in the Indenture (the form entitled "CONVERSION NOTICE" on the
reverse hereof), to the Company at the office or agency of the Company
maintained for that purpose in accordance with the terms of the Indenture, or at
the option of such holder, the Corporate Trust Office, and, unless the shares
issuable on conversion are to be issued in the same name as this Note, duly
endorsed by, or accompanied by instruments of transfer in form satisfactory to
the Company duly executed by, the holder or by his duly authorized attorney. No
adjustment in respect of interest on any Note converted or dividends on any
shares issued upon conversion of such Note will be made upon any conversion
except as set forth in the next sentence. If this Note (or portion hereof) is
surrendered for conversion during the period from the close of business on any
record date for the payment of interest to the close of business on the Business
Day preceding the following interest payment date and either (x) has not been
called for redemption on a redemption date that occurs during such period or (y)
is not to be redeemed in connection with a Change of Control on a Repurchase
Date that occurs during such period, this Note (or portion hereof being
converted) must be accompanied by an amount, in New York Clearing House funds or
other funds acceptable to the Company, equal to the interest payable on such
interest payment date on the principal amount being converted; provided,
however, that no such payment shall be required if there shall exist at the time
of conversion a default in the payment of interest on the Notes. No fractional
shares will be issued upon any conversion, but an adjustment and

                                       6
<PAGE>

payment in cash will be made, as provided in the Indenture, in respect of any
fraction of a share which would otherwise be issuable upon the surrender of any
Note or Notes for conversion. A Note in respect of which a holder is exercising
its right to require redemption upon a Change of Control may be converted only
if such holder withdraws its election to exercise such right in accordance with
the terms of the Indenture. Any Notes called for redemption, unless surrendered
for conversion by the holders thereof on or before the close of business on the
Business Day preceding the date fixed for redemption, may be deemed to be
redeemed from the holders of such Notes for an amount equal to the applicable
redemption price, together with accrued but unpaid interest (including
Liquidated Damages, if any) to (but excluding) the date fixed for redemption, by
one or more investment banks or other purchasers who may agree with the Company
(i) to purchase such Notes from the holders thereof and convert them into shares
of the Company's Common Stock and (ii) to make payment for such Notes as
aforesaid to the Trustee in trust for the holders.

        Upon due presentment for registration of transfer of this Note at the
office or agency of the Company maintained for that purpose in accordance with
the terms of the Indenture, a new Note or Notes of authorized denominations for
an equal aggregate principal amount will be issued to the transferee in exchange
thereof; subject to the limitations provided in the Indenture, without charge
except for any tax, assessment or other governmental charge imposed in
connection therewith.

        The Company, the Trustee, any authenticating agent, any paying agent,
any conversion agent and any Note registrar may deem and treat the registered
holder hereof as the absolute owner of this Note (whether or not this Note shall
be overdue and notwithstanding any notation of ownership or other writing hereon
made by anyone other than the Company or any Note registrar) for the purpose of
receiving payment hereof, or on account hereof, for the conversion hereof and
for all other purposes, and neither the Company nor the Trustee nor any other
authenticating agent nor any paying agent nor other conversion agent nor any
Note registrar shall be affected by any notice to the contrary. All payments
made to or upon the order of such registered holder shall, to the extent of the
sum or sums paid, satisfy and discharge liability for monies payable on this
Note.

        No recourse for the payment of the principal of or any premium or
interest on this Note, or for any claim based hereon or otherwise in respect
hereof, and no recourse under or upon any obligation, covenant or agreement of
the Company in the Indenture or any supplemental indenture or in any Note, or
because of the creation of any indebtedness represented thereby, shall be had
against any incorporator, stockholder, employee, agent, officer or director or
subsidiary, as such, past, present or future, of the Company or of any successor
corporation, either directly or through the Company or any successor
corporation, whether by virtue of any constitution, statute or rule of law or by
the enforcement of any assessment or penalty or otherwise, all such liability
being, by acceptance hereof and as part of the consideration for the issue
hereof, expressly waived and released.

        This Note shall be deemed to be a contract made under the laws of New
York, and for all purposes shall be construed in accordance with the laws of New
York, without regard to principles of conflicts of laws.

        Terms used in this Note and defined in the Indenture are used herein as
therein defined.

                                  ABBREVIATIONS

                                       7
<PAGE>

        The following abbreviations, when used in the inscription of the face of
this Note, shall be construed as though they were written out in full according
to applicable laws or regulations.

<TABLE>
<S>                                       <C>
TEN COM - as tenants in common            UNIF GIFT MIN ACT - _______ Custodian ______
TEN ENT - as tenant by the entireties                         (Cust)           (Minor)
JT TEN -  as joint tenants with right                         under Uniform Gifts to Minors Act
          of survivorship and not as                          ____________________________
          tenants in common                                             (state)
</TABLE>

        Additional abbreviations may also be used though not in the above list.

                                       8
<PAGE>

                                CONVERSION NOTICE

TO:     MENTOR GRAPHICS CORPORATION

        The undersigned registered owner of this Note hereby irrevocably
exercises the option to convert this Note, or the portion thereof (which is
$1,000 or an integral multiple thereof) below designated, into shares of Common
Stock of Mentor Graphics Corporation in accordance with the terms of the
Indenture referred to in this Note, and directs that the shares issuable and
deliverable upon such conversion, together with any check in payment for
fractional shares and any Notes representing any unconverted principal amount
hereof, be issued and delivered to the registered holder hereof unless a
different name has been indicated below. If shares or any portion of this Note
not converted are to be issued in the name of a person other than the
undersigned, the undersigned will provide the appropriate information below and
pay all transfer taxes payable with respect thereto. Any amount required to be
paid by the undersigned on account of interest accompanies this Note.

Dated: _______________

                                      _________________________________________

                                      _________________________________________
                                      Signature(s)

                                      Signature(s) must be guaranteed by an
                                      "ELIGIBLE GUARANTOR INSTITUTION" meeting
                                      the requirements of the Note registrar,
                                      which requirements include membership or
                                      participation in the Security Transfer
                                      Agent Medallion Program ("STAMP") or such
                                      other "SIGNATURE GUARANTEE PROGRAM" as may
                                      be determined by the Note registrar in
                                      addition to, or in substitution for,
                                      STAMP, all in accordance with the
                                      Securities Exchange Act of 1934, as
                                      amended.

                                      _________________________________________
                                      Signature Guarantee

_______________________________________________________________________________

        Fill in the registration of shares of Common Stock if to be issued, and
Notes if to be delivered, other than to and in the name of the registered
holder:

                                       9
<PAGE>

_________________________________
(Name)

_________________________________
(Street Address)

_________________________________
(City, State and Zip Code)

_________________________________
Please print name and address

Principal amount to be converted
(if less than all):

$________________________________

Social Security or Other Taxpayer
Identification Number:

_________________________________

                                       10
<PAGE>

                            OPTION TO ELECT REPAYMENT

                            UPON A CHANGE OF CONTROL

TO:     MENTOR GRAPHICS CORPORATION

        The undersigned registered owner of this Note hereby irrevocably
acknowledges receipt of a notice from Mentor Graphics Corporation (the
"COMPANY") as to the occurrence of a Change of Control with respect to the
Company and requests and instructs the Company to repay the entire principal
amount of this Note, or the portion thereof (which is $1,000 or an integral
multiple thereof) below designated, in accordance with the terms of the
Indenture referred to in this Note at the price of 100% of such entire principal
amount or portion thereof, together with accrued interest to, but excluding,
such repayment date, to the registered holder hereof.

Dated: _______________

                                      _________________________________________

                                      _________________________________________
                                       Signature(s)

                                          NOTICE: The above signatures of the
                                          holder(s) hereof must correspond with
                                          the name as written upon the face of
                                          the Note in every particular without
                                          alteration or enlargement or any
                                          change whatever.

                                          Principal amount to be repaid (if less
                                          than all):

                                      $________________________________________

                                      _________________________________________
                                       Social Security or Other
                                       Tax Identification Number

                                       11
<PAGE>

                                   ASSIGNMENT

        For value received ____________________________________________ hereby
sell(s) assign(s) and transfer(s) unto ______________________________ (Please
insert social security or other Taxpayer Identification Number of assignee)
the within Note, and hereby irrevocably constitutes and appoints
____________________________________ attorney to transfer said Note on the books
of the Company, with full power of substitution in the premises.

        In connection with any transfer of the Note within the United States or
to, or for the account of, U.S. persons and within the period prior to the
expiration of the holding period applicable to sales thereof under Rule 144(k)
under the Securities Act (or any successor provision) (other than any transfer
pursuant to a registration statement that has been declared effective under the
Securities Act), the undersigned confirms that such Note is being transferred:

        [ ]    To Mentor Graphics Corporation or a subsidiary thereof; or

        [ ]    To a "qualified institutional buyer" pursuant to and in
               compliance with Rule 144A under the Securities Act of 1933, as
               amended; or

        [ ]    To an Institutional Accredited Investor pursuant to and in
               compliance with the Securities Act of 1933, as amended; or

        [ ]    Pursuant to and in compliance with Rule 144 under the Securities
               Act of 1933, as amended;

        [ ]    Pursuant to a registration statement which has been declared
               effective under the Securities Act of 1933, as amended, and which
               continues to be effective at the time of such transfer;

and unless the box below is checked, the undersigned confirms that such Note is
not being transferred to an "AFFILIATE" of the Company as defined in Rule 144
under the Securities Act of 1933, as amended (an "AFFILIATE").

        [ ] The transferee is an Affiliate of the Company.

Dated: _____________

                                       12
<PAGE>

                                      _________________________________________

                                      _________________________________________

                                      Signature(s) must be guaranteed by an
                                      "ELIGIBLE GUARANTOR INSTITUTION" meeting
                                      the requirements of the Note registrar,
                                      which requirements include membership or
                                      participation in the Security Transfer
                                      Agent Medallion Program ("STAMP") or such
                                      other "SIGNATURE GUARANTEE PROGRAM" as may
                                      be determined by the Note registrar in
                                      addition to, or in substitution for,
                                      STAMP, all in accordance with the
                                      Securities Exchange Act of 1934, as
                                      amended.

                                      _________________________________________
                                      Signature Guarantee

NOTICE: The signature of the conversion notice, the option to elect repayment
upon a Change of Control or the assignment must correspond with the name as
written upon the face of the Note in every particular without alteration or
enlargement or any change whatever.

                                       13<PAGE>

                                                                     EXHIBIT 4.1

                             CERTIFICATE OF AMENDED
                            ARTICLES OF INCORPORATION
                                       OF
                          AMCAST INDUSTRIAL CORPORATION
                               -------------------

         The undersigned, Leo W. Ladehoff and Thomas G. Amato, being
respectively, the Chief Executive Officer and Secretary of AMCAST INDUSTRIAL
CORPORATION (the "Corporation"), a corporation for profit organized under the
Ohio General Corporation Law, with its principal office located in the City of
Kettering, Montgomery County, Ohio, do hereby certify that a meeting of the
directors of the Corporation was duly called and held on April 23, 1987, at
which meeting a quorum of the directors was present and acting throughout, and
that at such meeting, the directors unanimously adopted a resolution adopting
new Amended Articles of Incorporation of the Corporation to supercede and
consolidate the original Articles of Incorporation of the Corporation and all
amendments thereto as follows:

         "FIRST. The name of said Corporation shall be Amcast Industrial
Corporation.

         SECOND. The purpose or purposes of the Corporation shall be:

         (a) To manufacture, purchase, lease, or otherwise acquire and to hold,
own, sell, lease, or dispose of, trade in or deal in castings and other allied,
similar or related products of every kind and description.

         (b) To engage in any lawful act or activities for which corporations
may be formed under Section 1701.01 to 1701.98, inclusive, of the Ohio Revised
Code.

         THIRD. The place in the State of Ohio where the Corporation's principal
office shall be located is Kettering, Montgomery County, Ohio.

         FOURTH. The maximum number of shares which the Corporation is
authorized to have outstanding is 16,000,000 shares which shall be classified as
follows:

          1,000,000 Preferred Shares without par value (hereinafter called
     "Preferred Shares"); and

          15,000,000 Common Shares without par value (hereinafter called "Common
     Shares").

Section 1. The express terms and provisions of the Preferred Shares are as
follows:

         1.1 Preferred Shares may be issued in series from time to time. Within
the limitations and restrictions set forth in this Article FOURTH, the Board of
Directors is expressly authorized, at one time or from time to time, to adopt
amendments to the Articles of Incorporation in respect

<PAGE>

of any authorized and unissued Preferred Shares to fix or alter the division of
such shares into series, the designation and number of shares of each series,
the dividend rates, redemption rights,redemption prices, liquidation prices,
sinking fund requirements, conversion rights, and restrictions on issuance of
shares of the same series or of any other class or series. The express terms and
provisions of Preferred Shares of different series shall be identical except
that there may be variations in respect of any or all of the particulars
hereinbefore set forth in this subsection 1.1. In case the stated dividends or
the amounts payable on dissolution, liquidation, or sale of assets of the
Corporation are not paid in full, all Preferred Shares of all series shall
participate ratably in the payment of dividends, including accumulations, if
any, in proportion to the sums which would be payable thereon if all dividends
thereon were paid in full, and, in any distribution of assets other than by way
of dividends, in proportion to the same which would be payable on such
distribution if all sums payable thereon to holders of Preferred Shares were
discharged in full.

         1.2 The holders of Preferred Shares shall be entitled to receive when
and as declared out of the surplus of the Corporation, subject to any
limitations prescribed by statute, cash dividends at the respective rates and on
the respective dates fixed by the Board of Directors for the shares of the
several series of Preferred Shares, and no more. Dividends on each Preferred
Share shall be cumulative from the date fixed therefor by the Board of
Directors.

         1.3 Except as may be otherwise expressly provided in this Article
FOURTH, the Corporation shall have the right to redeem the Preferred Shares of
any one or more series at any time, either in whole or in such portions, as from
time to time, the Board of Directors may determine, upon the payment to the
respective holders thereof of the "General Redemption Price" thereof. The
General Redemption Price for shares of each series shall be an amount equal to
the sum of (a) the redemption price fixed by the Board of Directors for the
shares of such series prior to the initial issuance of the first shares of such
series; and (b) an amount equivalent to all accumulated and unpaid dividends on
the shares to be redeemed to the date fixed for redemption (hereinafter referred
to as the "Redemption Date"), whether or not such dividends shall have been
earned or declared. In lieu of such payment the Corporation may deposit the
General Redemption Price of the shares to be redeemed on or prior to the
Redemption Date with such responsible bank or trust company as may be designated
by the Board of Directors, in trust, for payment on or after the date of such
deposit (without awaiting the Redemption Date) to the holders of Preferred
Shares then to be redeemed. If less than the whole amount of outstanding
Preferred Shares of any particular series shall be redeemed at any time, the
shares thereof to be redeemed shall be selected by lot.

         Notice of any such redemption, in whole or in part, and of any such
deposit made or to be made of such General Redemption Price, shall be mailed to
each holder of Preferred Shares so to be redeemed, at his address registered
with the Corporation, not less than thirty days prior to the Redemption Date,
and, if less than all of the said shares owned by such shareholders are to be
redeemed, the notice shall specify the number of shares thereof which are to be
redeemed. Such notice having been so given, or irrevocable written authority to
the depositary having been given at the time of making the deposit provided for
herein forthwith to give such notice, all rights of the respective holders of
the said shares as shareholders of the Corporation by reason of the ownership of
such shares, except the right to receive the General Redemption Price of such
shares upon presentation and surrender of their respective certificates
representing the said shares, shall cease from and after the Redemption Date
(unless default shall be made by the

                                       2

<PAGE>

Corporation in providing monies for the payment of the General Redemption
Price), or, if the General Redemption Price shall have been deposited on or
prior to the Redemption Date as above permitted, from and after the date of such
deposit; provided, however, that in lieu of the right to receive the General
Redemption Price, any rights of conversion or exchange may be exercised up to
the close of business on the Redemption Date. If after such deposit any
Preferred Shares so called shall be so converted or exchanged, the amount
theretofore deposited with the depositary for the redemption thereof shall
forthwith be paid over by it to the Corporation. Any other monies so deposited
which shall remain unclaimed by the holders of Preferred Shares so called for
redemption at the end of two years after the Redemption Date shall be paid by
such depositary to the Corporation, after which the holders of such Preferred
Shares shall look only to the Corporation for payment of the General Redemption
Price thereof, without interest.

         1.4 Upon the dissolution, liquidation or sale of all or substantially
all the assets of the Corporation, the holders of Preferred Shares shall be
entitled to receive the following sums, before any payment shall be made to the
holders of Common Shares with respect to payment upon dissolution, liquidation
or sale of assets:

          (a)  in case of any involuntary dissolution or liquidation or forced
               sale of all or substantially all the assets of the Corporation,
               each Preferred Share of each series shall be entitled to receive
               the amount fixed for such contingency by the Board of Directors
               for the shares of such series prior to the issuance of the first
               shares of such series, together with a sum, whether or not earned
               or declared, equivalent to all accumulated and unpaid dividends
               thereon to the date of such payment; or

          (b)  in case of any voluntary dissolution or liquidation or voluntary
               sale of all or substantially all the assets of the Corporation,
               each Preferred Share of each series shall be entitled to receive
               the amount fixed for such contingency by the Board of Directors
               for the shares of such series prior to the initial issuance of
               the first shares of such series, together with a sum, whether or
               not earned or declared, equivalent to all accumulated and unpaid
               dividends thereon to the date of such payment.

         After all sums payable on the Preferred Shares as herein provided upon
a particular contingency shall have been paid in full, but not prior thereto,
the Common Shares shall be entitled to payment of all other sums then
distributable. For the purposes of this subsection 1.4, a consolidation or
merger of the Corporation with or into any other corporation, or a consolidation
or merger of any other corporation with or into the Corporation shall not be
deemed a dissolution, liquidation or sale of assets.

         1.5 The holders of Preferred Shares shall be entitled to one vote for
each Preferred Share held by them respectively.

         1.6 So long as any of the Preferred Shares shall remain outstanding, no
dividend (other than dividends payable in Common Shares) shall be paid, or shall
any distribution (by purchase, redemption, payment to any sinking fund, or
otherwise, other than stock splits) be made, on any of the Common Shares unless:

                                       3

<PAGE>

          (a)  all dividends on all outstanding Preferred Shares shall have been
               paid and full dividends thereon for the then current quarterly
               dividend period shall have been declared and a sum sufficient for
               the payment thereof set apart therefor; and

          (b)  the Corporation shall not be in arrears in respect of any sinking
               fund obligation in respect of any series of Preferred Shares.

         1.7 Preferred Shares acquired by the Corporation through the exercise
by the holders thereof of any conversion privilege shall not be reissued except
as hereinafter provided. Such shares and any other Preferred Shares acquired
otherwise than through the operation of any sinking fund and not used to reduce
the amount of any sinking fund installment shall, upon compliance with such
provisions of law relating to the retirement of shares as may be applicable,
have the status of authorized and unissued Preferred Shares which are
unclassified into any series. Preferred Shares acquired by the Corporation
through the operation of any sinking fund or which have been used to reduce the
amount of any sinking fund installment shall be cancelled and not reissued, and
the Corporation shall from time to time take appropriate corporate action to
reduce the authorized number of Preferred Shares accordingly.

         Section 2. The express terms and provisions of the Common Shares are as
follows:

         2.1 The rights and preferences of the Common Shares shall be subject in
all respects to the rights and preferences of the Preferred Shares in the manner
and to the extent provided in this Article FOURTH.

         2.2 The Common Shares shall rank junior to the Preferred Shares with
respect to the payment of dividends. Out of the assets of the Corporation
available for dividends remaining after there shall have been paid or declared
and set apart for payment full dividends on the Preferred Shares, and subject to
the restrictions or limitations contained in the express terms and provisions of
any series of Preferred Shares, dividends may be declared and paid upon the
Common Shares, but only when and as determined by the Board of Directors.

         2.3 The Common Shares shall rank junior to the Preferred Shares with
respect to payment upon dissolution, liquidation or sale of the assets of the
Corporation. Upon the dissolution, liquidation or sale of all or substantially
all the assets of the Corporation, after there shall have been paid to or set
apart for holders of the Preferred Shares the full preferential amounts to which
they are entitled, the holders of Common Shares shall be entitled to receive pro
rata all of the remaining assets of the Corporation available for distribution
to its shareholders.

         2.4 The holders of Common Shares shall be entitled to one vote for each
Common Share held by them respectively.

         Section 3. No shareholder of the Corporation shall have the right to
vote cumulatively in the election of directors of the Corporation.

         FIFTH. The Corporation, through its Board of Directors, shall have the
right and power to purchase any of its outstanding shares of stock at such price
and upon such terms as may be agreed upon between the Corporation and the
selling shareholder or shareholders.

                                       4

<PAGE>

         SIXTH. Notwithstanding any provision of the Ohio Revised Code now or
hereafter in force providing for any action for the vote, consent, waiver, or
release of the holders of shares entitling them to exercise two-thirds, or any
other proportion, of the voting power of the Corporation or of any class or
classes of shares thereof, such action, unless otherwise expressly required by
statute or by these Amended Articles of Incorporation, may be taken by the vote,
consent, waiver, or release of the holders of shares entitling them to exercise
a majority of the voting power of the Corporation or of such class or classes .

         SEVENTH. Notwithstanding the foregoing, the affirmative vote of the
holders of shares entitling them to exercise at least four-fifths of the voting
power of the Corporation shall be required:

          (a)  To approve (i) the sale, exchange, lease, transfer, or other
               disposition by the Corporation of all, or substantially all, of
               its assets or business to a related corporation or an affiliate
               of a related corporation, or (ii) the consolidation of the
               Corporation with or its merger into a related corporation or an
               affiliate of a related corporation, or (iii) the merger into the
               Corporation of a related corporation, or (iv) a combination or
               majority share acquisition in which the Corporation is the
               acquiring corporation and its voting shares are issued or
               transferred to a related corporation or an affiliate of a related
               corporation or to shareholders of a related corporation or an
               affiliate of a related corporation; or

          (b)  to approve any agreement, contract, or other arrangement with a
               related corporation providing for any of the transactions
               described in subparagraph (a) above.

         For the purpose of this Article SEVENTH, (i) a "related corporation" in
respect of a given transaction shall be any corporation which, together with its
affiliates and associated persons, owns of record or beneficially, directly or
indirectly, more than 5% of the shares of any class of outstanding shares of the
Corporation entitled to vote upon such transaction, as of the record date used
to determine the shareholders of the Corporation entitled to vote upon such
transaction; (ii) an "affiliate" of a related corporation shall be any
individual, joint venture, trust, partnership, or corporation which, directly or
indirectly through one or more intermediaries, controls, or is controlled by, or
is under common control with the related corporation; (iii) an "associated
person" of a related corporation shall be any officer or director or any
beneficial owner, directly or indirectly, of 10% or more of any class of equity
security of such related corporation or any of its affiliates; (iv) the terms
"combination", or "majority share acquisition" and "acquiring corporation" shall
have the same meaning as that contained in Section 1701 of the Ohio General
Corporation Law or any similar provision hereafter enacted.

         The determination of the Board of Directors of the Corporation, based
on information known to the Board of Directors and made in good faith, shall be
conclusive as to whether any corporation is a related corporation as defined in
this Article SEVENTH.

         The provisions of this Article SEVENTH shall not be applicable to (i)
any merger or consolidation of the Corporation with or into any other
corporation, or any sale or lease of all, or substantially all, of the assets of
the Corporation to, or any sale or lease to the Corporation, or any subsidiary
thereof, in exchange for securities of the Corporation of any assets of, any

                                       5

<PAGE>

corporation if the Board of Directors of the Corporation shall by resolution
have approved a memorandum of understanding with such other corporation with
respect to and substantially consistent with such transaction prior to the time
that such other corporation shall have become a holder of more than 20% of the
outstanding shares of stock of the Corporation entitled to vote in elections of
Directors; or (ii) any merger or consolidation of the Corporation with, or any
sale or lease to the Corporation, or any subsidiary thereof, of any of the
assets of, any corporation of which a majority of the outstanding shares of all
classes of stock entitled to vote in elections of Directors is owned of record
or beneficially by the Corporation and its subsidiaries.

         No amendment to the Articles of Incorporation of the Corporation shall
amend, alter, change, or repeal any of the provisions of this Article SEVENTH,
unless the amendment effecting such amendment, alteration, change, or repeal
shall receive the affirmative vote or consent of the holders of shares entitling
them to exercise at least four-fifths of the voting power of the Corporation.

         EIGHTH. No holder of shares of the Corporation of any class, as such,
shall have any preemptive right to purchase or subscribe for shares of the
Corporation, of any class, or other securities of the Corporation, of any class,
whether now or hereafter authorized.

         IN WITNESS WHEREOF, the undersigned, being respectively the Chief
Executive Officer and Secretary of the Corporation, acting for and on behalf of
the Corporation, have executed this Certificate and caused the seal of the
Corporation to be affixed hereto this 12th day of June, 1987.

                                        /s/ Leo W. Ladehoff
                                        ----------------------------------------
                                        Leo W. Ladehoff, Chief Executive

                                        /s/ Thomas G. Amato
                                        ----------------------------------------
                                        Thomas G. Amato, Secretary

(SEAL)

                                       6

<PAGE>

                           CERTIFICATE OF AMENDMENT TO
                        AMENDED ARTICLES OF INCORPORATION
                                       OF
                          AMCAST INDUSTRIAL CORPORATION
                               -------------------

         The undersigned, Leo W. Ladehoff and Thomas G. Amato, being
respectively, the Chairman of the Board and the Secretary of AMCAST INDUSTRIAL
CORPORATION the "Corporation"), an Ohio corporation, do hereby certify that at a
meeting of the directors of the Corporation duly called and held on February 24,
1988, the following resolution was unanimously adopted:

         NOW, THEREFORE BE IT RESOLVED, that pursuant to the authority vested in
the Board of Directors in accordance with the provisions of Article Fourth of
its Amended Articles of Incorporation, such Article Fourth hereby is amended to
set forth the designation and number of a new series of Preferred Shares and the
powers, preferences, and relative, participating, optional, and other special
rights and the qualifications, limitations, or restrictions thereof, as follows:

         Section 4.  Series A Preferred Shares.

         4.1. DESIGNATION AND AMOUNT. There shall be a series of the Preferred
Shares of the Corporation which shall be designated as the "Series A Preferred
Shares," without par value, and the number of such shares shall be 300,000.

         4.2. DIVIDENDS AND DISTRIBUTIONS.

         (A) Subject to the prior and superior rights of the holders of any
shares of any classes of preferred shares of the Corporation ranking prior and
superior to the Preferred Shares with respect to dividends, the holders of the
Preferred Shares in preference to the holders of Common Shares of the
Corporation (the "Common Shares"), and any other junior shares, shall be
entitled to receive, when, as and if declared by the Board of Directors out of
funds legally available for the purpose, quarterly dividends payable in cash on
the last day of March, June, September, and December in each year (or, in each
case, if not a date on which the Corporation is open for business, the next date
on which the Corporation is so open) (each such date being referred to herein as
a "Quarterly Dividend Payment Date"), commencing on the first Quarterly Dividend
Payment Date after the first issuance of a Preferred Share or fraction thereof,
in an amount per share (rounded to the nearest cent) equal to the greater of (a)
$11.00, or (b) subject to the provision for adjustment hereinafter set forth,
100 times the aggregate per share amount of all cash dividends, and 100 times
the aggregate per share amount (payable in kind) of all non-cash dividends or
other distributions other than a dividend payable in Common Shares or a
subdivision of the outstanding Common Shares (by reclassification or otherwise),
declared on the Common Shares, since the immediately preceding Quarterly
Dividend Payment Date, or, with respect to the first Quarterly Dividend Payment
Date, since the first issuance of any share or fraction of a Preferred Share. In
the event the Corporation at any time after February 24, 1988 (the "Rights
Declaration Date") (i) declares any dividend on Common Shares payable in Common
Shares, (ii) subdivides the outstanding Common Shares, or (iii) combines the
outstanding Common Shares into a smaller number of shares (all of which are
hereinafter

<PAGE>

referred to as "Common Share Adjustments"), then in each such case the amount to
which holders of the Preferred Shares were entitled immediately prior to such
event under clause (b) of the preceding sentence shall be adjusted by
multiplying such amount by a fraction the numerator of which is the number of
Common Shares outstanding immediately after such event and the denominator of
which is the number of Common Shares that were outstanding immediately prior to
such event (such fraction is hereinafter referred to as the "Adjustment
Number").

         (B) The Corporation shall declare a dividend or distribution on the
Preferred Shares as provided in paragraph (A) above immediately after it
declares a dividend or distribution on the Common Shares (other than a dividend
payable in Common Shares); provided that, in the event no dividend or
distribution shall have been declared on the Common Shares during the period
between any Quarterly Dividend Payment Date and the next subsequent Quarterly
Dividend Payment Date, a dividend of $11.00 per share on the Preferred Shares
shall nevertheless be payable on such subsequent Quarterly Dividend Payment
Date.

         (C) Dividends shall begin to accrue and be cumulative on the
outstanding Preferred Shares from the Quarterly Dividend Payment Date next
preceding the date of issue of such Preferred Shares, unless the date of issue
of such shares is prior to the record date for the first Quarterly Dividend
Payment Date, in which case dividends on such shares shall begin to accrue from
the date of issue of such shares, or unless the date of issue is a Quarterly
Dividend Payment Date or is a date after the record date for the determination
of holders of Preferred Shares entitled to receive a quarterly dividend and
before such Quarterly Dividend Payment Date in either of which events such
dividends shall begin to accrue and be cumulative from such Quarterly Dividend
Payment Date. Accrued but unpaid dividends shall not bear interest. Dividends
paid on the Preferred Shares in an amount less than the total amount of such
dividends at the time accrued and payable on such shares shall be allocated pro
rata on a share-by-share basis among all such shares at the time outstanding.
The Board of Directors may fix a record date for the determination of holders of
Preferred Shares entitled to receive payment of a dividend or distribution
declared thereon, which record date shall be no more than 30 days prior to the
date fixed for the payment thereof.

         4.3. VOTING RIGHTS. The holders of the Preferred Shares shall have the
following voting rights:

         (A) Each holder of a Preferred Share shall have one vote on all matters
submitted to a vote of the shareholders of the Corporation.

         (B) Except as otherwise provided herein or by law, the holders of the
Preferred Shares and the holders of Common Shares shall vote together as one
class on all matters submitted to a vote of shareholders of the Corporation.

         (C) Except as set forth herein, holders of the Preferred Shares shall
have no special voting rights and their consent shall not be required (except to
the extent they are entitled to vote with holders of Common Shares as set forth
herein) for taking any corporate action.

         4.4. CERTAIN RESTRICTIONS.

         (A) So long as any of the Preferred Shares remain outstanding, no
dividend (other than dividends payable in Common Shares) shall be paid, nor
shall any distribution (by purchase,

                                       2
<PAGE>

redemption, payment to any sinking fund, or otherwise, other than stock splits)
be made, on any of the Common Shares unless all dividends on all outstanding
Preferred Shares shall have been paid and full dividends thereon for the then
current quarterly dividend period shall have been declared and a sum sufficient
for the payment thereof set apart therefor.

         (B) The Corporation shall not permit any subsidiary of the Corporation
to purchase or otherwise acquire for consideration any shares of the Corporation
unless the Corporation could, under paragraph (A) of this Section 4.4, purchase
or otherwise acquire such shares at such time and in such manner.

         4.5. REACQUIRED SHARES. Any Preferred Shares purchased or otherwise
acquired by the Corporation in any manner whatsoever shall be retired and
cancelled promptly after the acquisition thereof. Unless otherwise prohibited by
the Corporation's Amended Articles of Incorporation, all such shares shall upon
their cancellation become authorized but unissued Preferred Shares and may be
reissued as part of a new series of Preferred Shares, subject to the conditions
and restrictions on issuance set forth herein.

         4.6. LIQUIDATION, DISSOLUTION, OR WINDING UP.

         (A) Upon any liquidation (voluntary or otherwise), dissolution, or
winding up of the Corporation, no distribution shall be made to the holders of
shares ranking junior (either as to dividends or upon liquidation, dissolution,
or winding up) to the Preferred Shares unless, prior thereto, the holders of
Preferred Shares shall have received $4,000 per share, plus an amount equal to
accrued and unpaid dividends and distributions thereon, whether or not declared,
to the date of such payment (the "Liquidation Preference"). Following the
payment of the full amount of the Liquidation Preference, no additional
distributions shall be made to the holders of Preferred Shares unless, prior
thereto, the holders of Common Shares shall have received an amount per share
(the "Common Payment") equal to the quotient obtained by dividing (i) the
Liquidation Preference by (ii) 100 (subject to the provision for adjustment set
forth in subparagraph C). Following the payment of the full amount of the
Liquidation Preference and the Common Payment in respect of all outstanding
Preferred Shares and Common Shares, respectively, holders of Preferred Shares
and holders of Common Shares shall receive their ratable and proportionate share
of the remaining assets to be distributed in the ratio of 100 to 1 with respect
to such Preferred Shares and Common Shares, on a per share basis, respectively
(subject to the provision for adjustment set forth in subparagraph C).

         (B) In the event there are not sufficient assets available to permit
payment in full of the Liquidation Preference and the liquidation preferences of
all other classes of preferred shares, if any, which rank on a parity with the
Preferred Shares, then such remaining assets shall be distributed ratably to the
holders of such parity shares in proportion to their respective liquidation
preferences. In the event there are not sufficient assets available to permit
payment in full of the Common Payment, then such remaining assets shall be
distributed ratably to the holders of Common Shares.

         (C) In the event the Corporation makes any Common Share Adjustments at
any time after the Rights Declaration Date, the amount otherwise payable to the
holders of the Preferred Shares shall be adjusted by multiplying such amount by
the Adjustment Number.

                                       3

<PAGE>

         4.7 CONSOLIDATION, MERGER, ETC. In case the Corporation shall enter
into any consolidation, merger, combination or other transaction in which the
shares of Common Shares are exchanged for or changed into other shares or
securities, cash and/or any other property, then in any such case the Preferred
Shares shall at the same time be similarly exchanged or changed in an amount per
share (subject to the provision for adjustment hereinafter set forth) equal to
100 times the aggregate amount of shares, securities, cash and/or any other
property (payable in kind), as the case may be, into which or for which each
Common Share is changed or exchanged. In the event the Corporation makes any
Common Share Adjustments at any time after the rights Declaration Date then the
amount set forth in the preceding sentence with respect to the exchange or
change of the Preferred Shares shall be adjusted by multiplying such amount by
the Adjustment Number.

         4.8 REDEMPTION. The Preferred Shares shall not be redeemable.

         4.9 RANKING. The Preferred Shares shall rank junior to all other
classes of the Corporation's preferred shares as to the payment of dividends and
the distribution of assets, unless the terms of any such series shall provide
otherwise.

         4.10 AMENDMENT. The Amended Articles of Incorporation of the
Corporation shall not be further amended in any manner that would materially
alter or change the powers, preferences, or special rights of the Preferred
Shares so as to affect them adversely without the affirmative vote of the
holders of a majority of the outstanding Preferred Shares, voting separately as
a class.

         4.11 FRACTIONAL SHARES. Preferred Shares may be issued in fractions of
a share which shall entitle the holder, in proportion to such holder's
fractional shares, to exercise voting rights, receive dividends, participate in
distributions, and to have the benefit of all other rights of holders of
Preferred Shares.

                                       4

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