Document:

<PAGE>   1

                                                                   EXHIBIT 4.1.2

                            CERTIFICATE OF CORRECTION
                        FILED TO CORRECT A CERTAIN ERROR
                                     IN THE
                            CERTIFICATE OF AMENDMENT
                                       TO
                       CERTIFICATE OF LIMITED PARTNERSHIP
                                       OF
                      MEWBOURNE ENERGY PARTNERS 99-A, L.P.

         MEWBOURNE ENERGY PARTNERS 99-A, L.P., a Delaware limited partnership
organized and existing under and by virtue of the Delaware Revised Uniform
Limited Partnership Act, DOES HEREBY CERTIFY:

         1.The name of the limited partnership is MEWBOURNE ENERGY PARTNERS
99-A, L.P.

         2.That a Certificate of Limited Partnership of MEWBOURNE ENERGY
PARTNERS 99-A, L.P. was filed with the Secretary of State of Delaware on April
6, 1999.

         3.That a Certificate of Amendment to the Certificate of Limited
Partnership of MEWBOURNE ENERGY PARTNERS 99-A, L.P. was filed with the Secretary
of State of Delaware on November 23, 1999, and said Certificate of Amendment to
the Certificate of Limited Partnership requires correction as permitted by
Section 17-213 of the Delaware Revised Uniform Limited Partnership Act.

         4.The inaccuracy or defect of the Certificate of Amendment to the
Certificate of Limited Partnership to be corrected is Exhibit A thereto, which
contains a list of the general partners, referred to in Article Two thereof.
Such Exhibit A, as originally filed, fails to name all such general partners.

         5.Exhibit A to the Certificate of Amendment to the Certificate of
Limited Partnership is corrected to read as set forth in Exhibit "A" attached
hereto.

         IN WITNESS WHEREOF, the undersigned, the managing general partner by
and through a duly authorized officer thereof and the attorney-in-fact for each
of the investor general partners set forth on Exhibit A, have executed this
Certificate of Correction to the Certificate of Amendment to Certificate of
Limited Partnership on this 2nd day of March, 2000.

         MEWBOURNE DEVELOPMENT CORPORATION, acting for itself and as
attorney-in-fact for each of the investor general partners as set forth on
Exhibit A

                                   By:  /s/ J. Roe Buckley
                                        ------------------
                                        J. Roe Buckley, Chief Financial Officer

<PAGE>   2

                               CORRECTED EXHIBIT A

                      MEWBOURNE ENERGY PARTNERS 99-A, L.P.
                         FINAL LIST OF GENERAL PARTNERS

Debra L. Albair Trust
Debra L. & William B. Albair, Trustees

Ardis M. Albany

Amos Family Trust
Charles R. & Sharon L. Amos, Trustees

Thomas H. Anderson Trust
Thomas H. & Bonita M. Anderson, Trustees

Cynthia W. Baer

Howard L. Baker, Jr. Trust
Howard L. Baker, Jr., Trustee

Albert D. Ballance

Blackman Family Trust
James E. & Virginia M. Blackman, Trustees

Vince Blum

Frederick W. Bode

Michael F & Mary Ann Bond

Cleo M. Bradford

Buford L. Brock Trust
Buford L. Brock, Trustee

Nancy N. Brown

Paul J. & Amanda Murphy Brown

Wayne R. Brown

Rosalie Bucci

Esther Bucher

George B. Bunch

Greg & Molly Bunton

Linda R. Burk Trust
Linda R. Burke, Trustee

J. Millard & Diane Burr

<PAGE>   3

Snowdon D. Byron Living Trust
Snowdon D. Byron, Trustee

CAK Equity Co.

John P. Cavanaugh Rev. Liv. Trust
John P. Cavanaugh, Trustee

Miriam Chang & Arthur W. Donoho

Lorin T. L. Chun

Louis P. Jr. & Edwina C. Clark

Dale T. & Jennie L. Clausen

Marcella Cleary Rev. Liv. Trust
Marcella H. Cleary, Trustee

John T. & Mary J. Coffey

Donald W. Cohen

Linda S. Cohen

Conrad Family Trust
William D. & Eloise D. Conrad, Trustees

Cotterill Family Trust
Carl H. or Ollie G. Cotterill, Trustees

Basil Coukis

R. Russell Darby

Patsy M. Davis

Claudia C. Dew Living Trust
Claudia C. Dew, Trustee

Diesman Family Trust
Michael & Kathleen Diesman, Trustees

Disalvo Living Trust
Anthony J., Sr.  & Rosina Disalvo, Trustees

Carl J. Disalvo Living Trust
Carl J. Disalvo, Trustee

Eunice R. Dobbs

Ed Don

Timothy R. & Nancy Dorlac

Donald J. Dorr

<PAGE>   4

Evelyn P. Dunn Rev. Trust
Evelyn P. & David A. Dunn, Trustees

Mark E. Dykman

Cosette M. Edgerton

Sherry & Joseph Elwell

The Engle Trust
Charles V. & Marjorie C. Engle, Trustees

Donna Gail Enrico

Sigo Falk

Eugene R. Fannin Rev. Trust
Eugene R. & Helen P. Fannin, Trustees

Featherstone Family Trust
John C. & A. Jo Featherstone, Trustees

Louis E. Fettig Rev. Trust
Louis E. Fettig, Trustee

James A. Fields

Mary M. Flauaus Rev. Liv. Trust
Mary M. Wurtz, Trustee

Alice Virgnia D. Fletcher

Gerald & Sherrill Froesel

Stephen J. Fukayama

Daniel E. & Robin L. Fuller

Fred W., Jr. & Mary C. Gladbach

Shuchita Goel

Dorothy I. Goggio Rev. Liv. Trust
Dorothy I. Goggio, Trustee

Margaret M. Goggio Trust
Margaret M. Goggio, Trustee

Michael & Ginia Goggio

Linda Gordon

Alice Griffey Rev. Liv. Trust
Alice Griffey, Trustee

Marilyn A. Galati-Grote Trust
Marilyn A. Galati-Grote, Trustee

<PAGE>   5

David L. & Diane M. Grubbs

George & Judith Guttschalk

Peter B. Halmos

Hamrick Family Trust
Don E. & Gloria F. Hamrick, Trustees

Kenneth W. & Virginia L. Harmann

Timothy A. Harrison Rev. Trust
Timothy A. Harrison, Trustee

Janis A. Hart Rev. Liv. Trust
Janis A. Hart, Trustee

Lyle G. & Nancy E. Hartman

Hayakawa Family Trust
George Y. & Betty H. Hayakawa, Trustees

Donald G. Heth Rev. Trust
Donald G. Heth, Trustee

Philip & Elaine Heverin

Hoffman Trust Dated 9/11/96
Amy M. Hoffman, Trustee

Holbrook Family Trust
Joseph C. & Martha S. Holbrook, Trustees

Larry S. & Beverly Humphries

Eileen Jernigan Rev. Living Trust
Eileen Jernigan, Trustees

Barbara G. Johnson

Janet R. Jokisch Rev. Living Trust
Janet R. Jokisch, Trustee

K & E Equity Co.

K & K Equity Co.

Trudy E. Keane

Kerr Family Trust
Robert A. & Janet F. Kerr, Trustees

Alan R. & Linda A. Kertz

Lorraine Kesling Rev. Liv. Trust
Lorraine Kesling, Trustee

<PAGE>   6

John W. Carole L. Keyser

Michael J. Kieler

Rebecca J. Kieler

Rosemay Kinder Rev. Liv. Trust
Rosemary Kinder, Trustee

J. Paul Kitchens

Larry Kneeskern

Richard A. & Frances M. Kopp

William L. Kraus, III

Daniel W. & Mary Kate Krause

Michael Krause Trust
Daniel W. Krause, Trustee

Bruce W. & Linda M. Kruenegel

Dale K. & Karen Kruse

Anita L. Helfers Kuss

John E. Landwehr Living Trust
John E. Landwehr, Trustee

Lawrence G. Lareau

Richard D. Lind Rev. Liv. Trust
Richard D. Lind, Trustee

Ronald G. & Cecilia Ann Lindemann

Linsin Rev. Living Trust
Russell J. & Virginia C. Linsin, Trustees

Rebecca A. Lippitt

Albert L., Jr. & Barbara A. Lock

1988 Lodi Living Trust
Edward & Rose Marie Lodi, Trustees

John & Vera Lopez

Jeffrey W. Lubore

David J. Lucido Trust
David J. & Mary E. Sudbrock Lucido, Trustees

Elaine K. MacDonald

Richard A. & Virgnia B. MacEwen

<PAGE>   7

Thomas C. Macom

John F. & Quy T. Manning

Mason Family Trust
Robert J. & Rita R. Mason, Trustees

Joy R. Masters Trust
Joy R. & Bernard L. Masters, Trustees

Dr. Douglas S. & Sandra M. McFarlane

McGlaughlin Rev. Living Trust
Robert & Mary McGlaughlin, Trustees

James & Susan McHugh

William R. McKibbon, Jr.

McMurry, Thomas G. & Lora A.

Randy & Donna Mefford

C. Robert & Mary Teresa Meloni

John G. Mergner Sr.

Francis A. Messig Rev. Living Trust
Francis A. Messig, Trustee

Virginia R. Minard Trust
Virginia R. Minard, Trustee

Richard C. Minto Rev. Liv. Trust
Richard C. Minto, Trustee

Darrin Miranda

Carl J. & Judith A. Modzinski

C. W. Moore

Robert E. Mortensen

Mosher-Schreiber Family Trust
Loren R. Mosher & Judith L. Schreiber, Trustees

Mothershead Family Trust
Theodore E. & Beaty M. Mothershead, Trustees

A. Robert Neurath

Lawrence L. Nichols

Ki Norman

Bonifacio Olguin

<PAGE>   8

John F. Parrott

Sadashiv D. Parwatikar

Zelah G. Pek

Jimmy Pendergraft

Lucy R. Pennoyer

Claudia H. Peters

L. Gordon Pfefferkorn, Jr.

Patricia H. Polinsky

Charles H. Powers

Mable W. Quinby Rev. Trust
Mable W. Quinby, Trustee

Katherine D. Rallo Living Trust
Katherine D. Rallo, Trustee

E. Darlene Reagan

Ralph E. Reardon

Melvin Rector Jr. & Susan Rector

James E. Reittinger

Jeannette A. Richards

Barbara J. Richter Liv. Trust
Barbara J. Richter, Trustee

James F. Rinard

Marilyn D. Rodell Rev. Liv. Trust
Marilyn D. Rodell, Trustee

Susan M. Scalise Rev. Liv. Trust
Susan M. Scalise, Trustee

John & Jean Schaller

Mary Ann Schuermann Rev. Living Trust
Mary Ann Schuermann, Trustee

William G. Schmegel Trust
William G. & Dorothy L. Schmegel, Trustees

Vernon J. & Betty Jane Schmitz

Antje B. Schneider & Jorn Borchmann

Antje B. Weaver Schneider

<PAGE>   9

Thomas P. & Rachel M. Schneider

David R. Schroeder Liv. Trust
David R. & Jan Schroeder, Trustees

Jan F. Schroeder Liv. Trust
Jan F. & David R. Schroeder, Trustees

Peter M. Scott, III

Stephen G. & Patricia L. Seroka

Kay R. Shirley

Joseph A. & Laura M. Shull

Catherine B. Simcoe Survivors Trust
Catherine B. Simcoe, Trustee

John T. Skehan

James C. Smith Jr. Rev. Trust
James C. Smith, Jr., Trustee

Ronald A. Solarz

Edward T. Sprock Trust
Edward T. Sprock, Trustee

Margaret L. Stelzer

Dolores L. Stolarski

Stout Family Trust
Richard P. & Sarajenny A. Stout, Trustees

James J. & Linda A. Stragand

Mary A. Suchan Rev. Living Trust
Mary A. Suchan, Trustee

Gladyce Sumida

Szwargulski Rev. Living Trust
Jesse L. & Charlene A. Szwargulski, Trustees

Joseph M. & Maureen F. Tabacchi

R. Glenn & Gretchen Taylor

Margaret S. Todd

Anthony & Sue Tosto

Dillon K. Trulove Rev. Trust
Dillon Trulove, Trustee

Ka-Khy & Sayeda B. Tze

<PAGE>   10

Loren W. & Janice A. Vanderwert

Donald W. Viets, Jr.

Walter C. Wagner

Barbara Waldman

John R. Sr. & Sharon K. Walsh

Wamhoff Rev. Living Trust

Robert E. & Diane Wamhoff, Trustees

Brian D. & Sherri L. Wassel

Fred Weissenborn

Doris I. Wills

Gary S. & Patricia J. Wilson

Larry T. Wilson

Lori J. Wright

Dennis P. Yarnell

<PAGE>   11

                                                                       EXHIBIT B

                         MEWBOURNE ENERGY PARTNERS 99-A
                                LIMITED PARTNERS

Steve J. Adams

Catherine S. Beals

John & Susan Best

Pardeep K. Bhanot

Lana D. Brady

Robert B. Cavanah

Thomas J. Conley Trust
Thomas J. & Betty A. Conley, Trustees

Kathryn A. Crouch Rev. Liv. Trust
Kathryn A. Crouch, Trustee

David T. Garrett, Inc.

Sam S. & Randa S. Hawatmeh

Michael J. & Helen M. Hogan

Joanne S. Iverson Liv. Trust
Joanne S. Iverson, Trustee

Thomas Michael & Anne L. Knasel

Fred C. Mitchell

Gene T. Morris Declaration Trust
Gene T. Morris, Trustee

Gary M. & J. Delores Neimeyer

Jesse Nimmer Trust
Joel & Julie Nimmer, Trustees

M. Annette Penny Rev. Living Trust
M. Annette Penny, Trustee

Thomas V. & Sharon L. Plunket

Danial L. Poel & Robbie L. Rose-Poel

Charlene Ramsey

Marian M. Reagan

Timothy E. & Victoria Ellison-Rodell

<PAGE>   12

Shimodoi Family Trust
Teddy S. & Lily Y. Shimodoi, Trustees

Snyder Family Trust
John Edward & Carolyn Jean Snyder, Trustees

Richard Stanley & Barbara Cohen Trust
Richard Stanley & Barbara Cohen, Trustees

Sarah H. Taylor

Terrie R. Weems

Womble Drug Company, Inc.
Logan N. Womble & Joseph E. Womble<PAGE>   1
                                                                    Exhibit 10.5

                            ASSIGNMENT AND ACCEPTANCE
                            -------------------------

                           Dated as of October 1, 1999

     Reference is made to the Amended and Restated Multicurrency Revolving
Credit and Term Loan Agreement, dated as of January 31, 1996 (as from time to
time amended and in effect, the "Credit Agreement"), by and among TERADYNE INC.
(the "Borrower"), the banking institutions referred to therein as Banks
(collectively, the "Banks"), and BANKBOSTON, N.A., a national banking
association, as agent (in such capacity, the "Agent") for the Banks. Capitalized
terms used herein and not otherwise defined shall have the meanings assigned to
such terms in the Credit Agreement.

     State Street Bank and Trust Company, N.A. (the "Assignor") and Citizens
Bank of Massachusetts (the "Assignee") hereby agree as follows:

     1. ASSIGNMENT. Subject to the terms and conditions of this Assignment and
Acceptance, the Assignor hereby sells and assigns to the Assignee, and the
Assignee hereby purchases and assumes without recourse to the Assignor, a 100%
interest in and to the rights, benefits, indemnities and obligations of the
Assignor under the Credit Agreement.

     2. ASSIGNOR'S REPRESENTATIONS. The Assignor (i) represents and warrants
that (A) it is legally authorized to enter into this Assignment and Acceptance,
and (B) immediately after giving effect to all assignments which have not yet
become effective, the Assignor's Commitment Percentage will be sufficient to
give effect to this Assignment and Acceptance, (ii) makes no representation or
warranty, express or implied, and assumes no responsibility with respect to any
statements, warranties or representations made in or in connection with the
Credit Agreement or any of the other Loan Documents or the execution, legality,
validity, enforceability, genuineness, sufficiency or value of the Credit
Agreement, any of the other Loan Documents or any other instrument or document
furnished pursuant thereto or the attachment, perfection or priority of any
security interest or mortgage, other than that it is the legal and beneficial
owner of the interest being assigned by it hereunder free and clear of any claim
or encumbrance; and (iii) makes no representation or warranty and assumes no
responsibility with respect to the financial condition of the Borrower or any of
its Subsidiaries or any other Person primarily or secondarily liable in respect
of any of the Obligations, or the performance or observance by the Borrower or
any of its Subsidiaries or any other Person primarily or secondarily liable in
respect of any of the Obligations of any of its obligations under the Credit
Agreement or any of the other Loan Documents or any other instrument or document
delivered or executed pursuant thereto.

<PAGE>   2

     3. ASSIGNEE'S REPRESENTATIONS. The Assignee (i) represents and warrants
that (A) it is duly and legally authorized to enter into this Assignment and
Acceptance, (B) the execution, delivery and performance of this Assignment and
Acceptance do not conflict with any provision of law or of the charter or
by-laws of the Assignee, or of any agreement binding on the Assignee, (C) all
acts, conditions and things required to be done and performed and to have
occurred prior to the execution, delivery and performance of this Assignment and
Acceptance, and to render the same the legal, valid and binding obligation of
the Assignee, enforceable against it in accordance with its terms, have been
done and performed and have occurred in due and strict compliance with all
applicable laws; (ii) confirms that it has received a copy of the Credit
Agreement, together with copies of the most recent financial statements
delivered pursuant thereto and such other documents and information as it has
deemed appropriate to make its own credit analysis and decision to enter into
this Assignment and Acceptance; (iii) agrees that it will, independently and
without reliance upon the Assignor, the Agent or any other Bank and based on
such documents and information as it shall deem appropriate at the time,
continue to make its own credit decisions in taking or not taking action under
the Credit Agreement; (iv) represents and warrants that it is an Eligible
Assignee; (v) appoints and authorizes the Agent to take such action as agent on
its behalf and to exercise such powers under the Credit Agreement and the other
Loan Documents as are delegated to the Agent by the terms thereof, together with
such powers as are reasonably incidental thereto; and (vi) agrees that it will
perform in accordance with their terms all the obligations which by the terms of
the Credit Agreement are required to be performed by it as a Bank.

     4. EFFECTIVE DATE. The effective date for this Assignment and Acceptance
shall be the date first set forth above (the "Effective Date"). Following the
execution of this Assignment and Acceptance and the consent of the Borrower
hereto having been obtained, each party hereto shall deliver its duly executed
counterpart hereof to the Agent for consent by the Agent and recording in the
Register by the Agent. Schedule 1 to the Credit Agreement shall thereupon be
replaced as of the Effective Date by the Schedule 1 annexed hereto.

     5. RIGHTS UNDER CREDIT AGREEMENT. Upon such acceptance and recording, from
and after the Effective Date, (i) the Assignee shall be a party to the Credit
Agreement and, to the extent provided in this Assignment and Acceptance, have
the rights and obligations of a Bank thereunder, and (ii) the Assignor shall,
with respect to that portion of its interest under the Credit Agreement assigned
hereunder, relinquish its rights and be released from its obligations under the
Credit Agreement; provided, however, that the Assignor shall retain its rights
to be indemnified pursuant to the Credit Agreement with respect to any claims or
actions arising prior to the Effective Date.

     6. PAYMENTS. Upon such acceptance of this Assignment and Acceptance by the
Agent and such recording, from and after the Effective Date, the Agent shall

                                      -2-
<PAGE>   3

make all payments in respect of the rights and interests assigned hereby
(including payments of principal, interest, fees and other amounts) to the
Assignee. The Assignor and the Assignee shall make any appropriate adjustments
in payments for periods prior to the Effective Date by the Agent or with respect
to the making of this assignment directly between themselves. In addition, the
Agent hereby agrees to waive the recordation fee of $3,000 required by ss.12.3
of the Credit Agreement.

     7. GOVERNING LAW. THIS ASSIGNMENT AND ACCEPTANCE IS INTENDED TO TAKE EFFECT
AS A SEALED INSTRUMENT TO BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE
LAWS OF THE COMMONWEALTH OF MASSACHUSETTS (WITHOUT REFERENCE TO CONFLICT OF
LAWS).

     8. COUNTERPARTS. This Assignment and Acceptance may be executed in any
number of counterparts which shall together constitute but one and the same
agreement.

                                      -3-
<PAGE>   4

     IN WITNESS WHEREOF, intending to be legally bound, each of the undersigned
has caused this Assignment and Acceptance to be executed on its behalf by its
officer thereunto duly authorized, as of the date first above written.

                                       STATE STREET BANK AND TRUST
                                       COMPANY, Assignor

                                       By:_____________________________________
                                               Name:
                                               Title:

                                       CITIZENS BANK OF
                                       MASSACHUSETTS, Assignee

                                       By:_____________________________________
                                               Name:
                                               Title:

CONSENTED TO:

TERADYNE INC.

By:_____________________________________
       Name:
       Title:

BANKBOSTON, as Agent

By:_____________________________________
       Name:
       Title:

                                      -4-
<PAGE>   5
                                   SCHEDULE 1
                                   ----------

          Immediately following the Effective Date:

<TABLE>
<S>                                                                <C>
          Commitment of State Street Bank and Trust Company        $0
          Commitment of Citizens Bank of Massachusetts             $10,500,000
</TABLE>

                                      -5-

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