Document:

<PAGE>
                                                                    EXHIBIT 10.1

                             AMENDMENT NO. 3 TO THE
                          1999 STOCK INCENTIVE PLAN OF
                                  AMETEK, INC.

      WHEREAS, AMETEK, Inc. has adopted the 1999 Stock Incentive Plan of AMETEK,
Inc. (the "Plan"); and

      WHEREAS, Section 18 of the Plan permits the Committee, as defined in the
Plan (the "Committee") to amend the Plan; and

      WHEREAS, the Committee now desires to amend the Plan in certain respects;

      NOW, THEREFORE, the Plan is hereby amended as follows:

      1.    Section 5 shall be amended to read in its entirety as follows:

            "5. Participants. All key employees of the Corporation and its
            Affiliates shall be eligible to receive Incentive Awards under
            the Plan. The persons to whom Incentive Awards are to be
            offered under the Plan and the number of Shares with respect
            to which Incentive Awards are to be granted to each such
            person shall be determined by the Committee in its sole
            discretion subject, however, to the terms and conditions of
            the Plan."

      2.    The provisions of this Amendment No. 3 shall be effective as of May
            21, 2002.

      3.    Except to the extent hereinabove set forth, the Plan shall remain in
            full force and effect.

      IN WITNESS WHEREOF, the Committee has caused this Amendment No. 3 to be
executed by a duly authorized officer of the Company, and its corporate seal to
be affixed, as of the 21st day of May, 2002.

                                          AMETEK, Inc.

                                          By: /S/ John J. Molinelli
                                              --------------------------------
                                              John J. Molinelli

ATTEST:

/S/ Kathryn E. Londra
------------------------------------
Kathryn E. Londra   (SEAL)<PAGE>
                                                                    EXHIBIT 10.2

                                SECOND AMENDMENT
                            DATED AS OF JUNE 3, 2002
                                       TO
                         RECEIVABLES PURCHASE AGREEMENT
                           DATED AS OF OCTOBER 1, 1999

      THIS SECOND AMENDMENT (the "Amendment"), dated as of June 3, 2002 is
entered into among Ametek, Inc. ("Ametek"), Rotron Incorporated ("Rotron") (each
of Ametek and Rotron being referred to individually, as an "Originator" and
collectively, as the "Originators"), and Ametek Receivables Corp. (the
"Company").

                                   WITNESSETH:

      WHEREAS, the Originators and the Company have heretofore executed and
delivered a Receivables Purchase Agreement, dated as of October 1, 1999 (as
amended, supplemented or otherwise modified through the date hereof, the
"Purchase Agreement"), and

      NOW, THEREFORE, for good and valuable consideration, the receipt and
adequacy of which are hereby acknowledged, the parties hereto hereby agree that
the Purchase Agreement shall be and is hereby amended as follows:

      Section 1. (a) The defined term "Divisions" appearing in Schedule I to the
Purchase Agreement is hereby amended in its entirety and as so amended shall
read as follows:

                  "Divisions" means the following divisions of Ametek:
            Ametek Aerospace, Lamb Electric, Rotron Technical Motor
            Division, Specialty Metal Products, U.S. Gauge, Process &
            Analytical Instruments, Test & Calibration Instruments, and
            Prestolite Power and Switch.

      Section 2. This Amendment shall become effective on the date the Agent has
received counterparts hereof executed by each Originator and the Company.

      Section 3. This Amendment may be executed in any number of counterparts
and by the different parties on separate counterparts and each such counterpart
shall be deemed to be an original, but all such counterparts shall together
constitute but one and the same Amendment.

      Section 4. Except as specifically provided above, the Purchase Agreement
and the other Transaction Documents shall remain in full force and effect and
are hereby ratified and confirmed in all respects. All defined terms used herein
and not defined herein shall have the same meaning herein as in the Transaction
Documents. The Company agrees to pay on demand all costs and expenses (including
reasonable fees and expenses of counsel) of or incurred by the Agent and the
Originators in connection with the negotiation, preparation, execution and
delivery of this Amendment.
<PAGE>
      Section 5. This Amendment and the rights and obligations of the parties
hereunder shall be construed in accordance with and be governed by the law of
the State of New York.

                                      -2-
<PAGE>
      IN WITNESS WHEREOF, the parties have caused this Amendment to be executed
and delivered by their duly authorized officers as of the date first above
written.

                                       AMETEK, INC.

                                       By: Deirdre D. Saunders
                                          -----------------------
                                       Title: VP & Treasurer

                                       ROTRON INCORPORATED

                                       By: Deirdre D. Saunders
                                          -----------------------
                                       Title: Treasurer

                                       AMETEK RECEIVABLES CORP.

                                       By: Deirdre D. Saunders
                                          -----------------------
                                       Title: Treasurer

                                       -3-<PAGE>
                                                                    EXHIBIT 10.3

                                 THIRD AMENDMENT
                            DATED AS OF JUNE 28, 2002
                                       TO
                         RECEIVABLES PURCHASE AGREEMENT
                           DATED AS OF OCTOBER 1, 1999

      THIS THIRD AMENDMENT (the "Amendment"), dated as of June 28, 2002 is
entered into among Ametek, Inc. ("Ametek"), Rotron Incorporated ("Rotron")
(each of Ametek and Rotron being referred to individually, as an "Originator"
and collectively, as the "Originators"), Ametek Receivables Corp. (the
"Company") and Advanced Measurement Technology, Inc. ("Advanced"), Patriot
Sensors and Controls Corporation ("Patriot") and EDAX Inc. ("EDAX").

                                   WITNESSETH:

      WHEREAS, the Originators and the Company have heretofore executed and
delivered a Receivables Purchase Agreement, dated as of October 1, 1999 (as
amended, supplemented or otherwise modified through the date hereof, the
"Purchase Agreement"), and

      WHEREAS, the parties hereto desire to add Advanced, Patriot and EDAX as
Originators under the Purchase Agreement effective as of June 28, 2002 (the
"Effective Date").

      NOW, THEREFORE, for good and valuable consideration, the receipt and
adequacy of which are hereby acknowledged, the parties hereto hereby agree that
the Purchase Agreement shall be and is hereby amended as follows:

      Section 1. (a) From and after the Effective Date, the defined term
"Originator" shall be amended to include Advanced, Patriot and EDAX
(collectively, the "New Originators"). In addition, from and after the Effective
Date Advanced, Patriot and EDAX agree to be bound by all of the terms and
conditions applicable to an Originator contained in the Purchase Agreement and
other Transaction Documents. Subject to the terms and conditions of the Purchase
Agreement, each New Originator hereby sells to the Company, and the Company
hereby acquires from such New Originator, all of such New Originator's right,
title and interest in the Purchased Receivables of such New Originator, the
Related Security and related Collections. Each New Originator intends such sale
to be a true sale of all rights and interest of such New Originator in the
Receivables of such New Originator in existence on the Initial Purchase Date and
of each Receivable thereafter generated by such New Originator as it is created
until the Originator Termination Date for such New Originator.

      (b) In connection with the execution of this Amendment, Advanced, Patriot
and EDAX agree to deliver each of the documents set forth in Section 7.1 of the
Receivables Sale Agreement, to the extent that such documents are applicable.
<PAGE>
      Section 2. This Amendment shall become effective on the date the Agent has
received counterparts hereof executed by each Originator and the Company.

      Section 3. This Amendment may be executed in any number of counterparts
and by the different parties on separate counterparts and each such counterpart
shall be deemed to be an original, but all such counterparts shall together
constitute but one and the same Amendment.

      Section 4. Except as specifically provided above, the Purchase Agreement
and the other Transaction Documents shall remain in full force and effect and
are hereby ratified and confirmed in all respects. All defined terms used herein
and not defined herein shall have the same meaning herein as in the Transaction
Documents. The Company agrees to pay on demand all costs and expenses (including
reasonable fees and expenses of counsel) of or incurred by the Agent and the
Originators in connection with the negotiation, preparation, execution and
delivery of this Amendment.

      Section 5. This Amendment and the rights and obligations of the parties
hereunder shall be construed in accordance with and be governed by the law of
the State of New York.

                                      -2-
<PAGE>
      IN WITNESS WHEREOF, the parties have caused this Amendment to be executed
and delivered by their duly authorized officers as of the date first above
written.

                                       AMETEK, INC.

                                       By: Deirdre D. Saunders
                                          -----------------------
                                       Title: VP & Treasurer

                                       ROTRON INCORPORATED

                                       By: Deirdre D. Saunders
                                          -----------------------
                                       Title: Treasurer

                                       ADVANCED MEASUREMENT TECHNOLOGY, INC

                                       By: Deirdre D. Saunders
                                          -----------------------
                                       Title: Treasurer

                                       PATRIOT SENSORS AND CONTROLS CORPORATION

                                       By: Deirdre D. Saunders
                                          -----------------------
                                       Title: Treasurer

                                       EDAX INC.

                                       By: Elvin J. Stoltzfus
                                          -----------------------
                                       Title: Treasurer

                                       AMETEK RECEIVABLES CORP.

                                       By: Deirdre D. Saunders
                                          -----------------------
                                       Title: Treasurer

                                      -3-

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