Document:

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                                                                    EXHIBIT 10.2

                                 AMENDMENT No. 4

                                       to

                   AMETEK 401(k) PLAN FOR ACQUIRED BUSINESSES

              WHEREAS, there was adopted and made effective as of May 1, 1999,
the AMETEK 401(k) Plan for Acquired Businesses (the "Acquired Businesses Plan");
and

              WHEREAS, Section 10.1 of the Plan provides that AMETEK, Inc.
("AMETEK") may amend the Plan at any time, and from time to time; and

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

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

              FIRST: Section 6.2 of the Plan is amended to read in its entirety
as follows:

         "6.2 Attainment of 59-1/2.

              (a) General Rule. If a Participant attains age 59-1/2 and remains
         in the service of the Employer, he may elect to have the value of his
         Deferral Election Account and Employer Matching Contribution Account
         (determined in accordance with Sections 5.2 and 5.3 and valued as of
         the Valuation Date coincident with or next succeeding the date of his
         election or, pursuant to procedures which the Committee may, in its
         sole discretion, adopt, as of the last day of the month in which he
         files his election) paid to him (or his Beneficiary in the event of his
         death) in a lump sum as soon as practicable following the date as of
         which his Accounts are valued. The Participant (or Beneficiary) may
         make such an election by filing a written notice with the Committee, on
         a form acceptable to the Committee. Notwithstanding such withdrawal,
         the Participant may also elect to continue to participate in the Plan
         if he otherwise remains eligible.

              (b) Special Rule for Former National Controls Corporation
         Retirement Savings Plan (the "NCC Plan") Participants. In addition to
         the lump sum distribution described in paragraph 6.2(a), any
         Participant who was formerly a Participant in the NCC Plan and whose
         account balance under the NCC Plan is transferred to this Plan in
         conjunction with the merger of the NCC Plan into this Plan shall be
         entitled to receive his distribution in the form of installment
         payments described in 6.4(d), but only with respect to that portion of
         his account balance that represented his account balance under the NCC
         Plan as of the date of merger."
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              SECOND: Section 6.4(d) of the Plan is amended by adding a new
paragraph to the end thereof to read in its entirety as follows

              "Notwithstanding the foregoing, any Participant who was formerly a
Participant in the NCC Plan and whose account balance under that Plan is
transferred to this Plan in conjunction with the merger of the NCC Plan into
this Plan shall be entitled to receive his distribution in the form of
installment payments in substantially equal installments not less frequently
than annually over a period not exceeding the Participant's life expectancy or
the life expectancy of the Participant and any individual designated as a
Beneficiary by the Participant, but only with respect to that portion of his
account balance that represented his account balance under the NCC Plan as of
the date of merger."

              THIRD: Schedule I is hereby amended, to read in its entirety as
follows:

                                   "SCHEDULE I

<TABLE>
<CAPTION>
                      Subsidiary/Division                            Employer Matching Contribution
                      -------------------                            ------------------------------
<S>                                                                  <C>

         Aerospace Division (Costa Mesa Plant)                                      4%

         AMETEK Patriot Sensors Division (Michigan)                                 3%

         AMETEK Aerospace Patriot Products                                          3%
              (California)

         AMETEK Patriot Sensors Division (Pennsylvania)                             3%
         (known as Drexelbrook Controls, Inc. until merged into
         Patriot on 1/12/00)"

         AMETEK National Controls Corporation Retirement                            5%
               Savings Plan
</TABLE>

              FOURTH: The provisions of this Amendment No. 4 shall be effective
as of July 1, 2000.

         IN WITNESS WHEREOF, AMETEK has caused these presents to be executed, in
its corporate name, by its duly authorized officer on this 30th day of June,
2000.

                                                 AMETEK, Inc.

                                                 By: /s/ Donna F. Winquist
                                                     ---------------------------
Attest:

/s/ Kathryn E. Londra
---------------------------<PAGE>   1
                                                                    EXHIBIT 10.3

                                AMENDMENT No. 11

                                       to

                       AMETEK RETIREMENT AND SAVINGS PLAN

              WHEREAS, there was adopted and made effective as of October 1,
1984, the AMETEK Retirement and Savings Plan (the "Plan"); and

              WHEREAS, the Plan was amended and restated in its entirety,
effective January 1, 1997; and

              WHEREAS, Section 10.1 of the Plan provides that AMETEK, Inc.
("AMETEK") may amend the Plan at any time, and from time to time; and

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

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

              FIRST: Section 6.4(b) of the Plan is amended to read in its
entirety as follows:

              "(b) Retirement Participants. A Retirement Participant or Former
         Retirement Participant who has terminated his employment on or after
         his Normal Retirement Age or because he was Disabled shall be entitled
         to receive a distribution or a direct transfer to another plan of the
         value of his Accounts as soon as administratively practicable."

              SECOND: Section 6.4(c) of the Plan is amended to read in its
entirety as follows:

              "(c) Terminated Participants. Upon a Participant's or a Retirement
         Participant's termination of employment with the Employer, either
         voluntarily or involuntarily, prior to his Normal Retirement Age (other
         than by reason of his death or Disability), he shall be entitled to
         receive a distribution or a direct transfer to another plan of the
         value of his Accounts, pursuant to Section 6.1; as soon as
         administratively practicable after returning a completed benefit
         distribution form to the Committee provided, however that his Accounts
         must be distributed no later than his Mandatory Distribution Date as
         determined under Section 6.5.
<PAGE>   2
              Until benefits are distributed, a Participant's or a Retirement
         Participant's Accounts shall be held and invested in accordance with
         Section 9.2 pursuant to the instructions of the Former Participant or
         Former Retirement Participant."

              SECOND: The provisions of this Amendment No. 11 shall be effective
as of May 1, 2000.

              IN WITNESS WHEREOF, AMETEK has caused these presents to be
executed, in its corporate name, by its duly authorized officer on this 18th day
of May, 2000.

                                                 AMETEK, Inc.

                                                 By: /s/ Donna F. Winquist
                                                     ---------------------------

Attest:

/s/ Kathryn E. Londra
---------------------------

                                       2<PAGE>   1
                                                                    EXHIBIT 10.4

                                AMENDMENT No. 12

                                       to

                       AMETEK RETIREMENT AND SAVINGS PLAN

              WHEREAS, there was adopted and made effective as of October 1,
1984, the AMETEK Retirement and Savings Plan (the "Plan"); and

              WHEREAS, the Plan was amended and restated in its entirety,
effective January 1, 1997; and

              WHEREAS, Section 10.1 of the Plan provides that AMETEK, Inc.
("AMETEK") may amend the Plan at any time, and from time to time; and

              WHEREAS, AMETEK, for certain retention and recruiting reasons has
decided to allow the following employees to participate in the Plan as follows:

              Effective February 21, 2000 for Michael Davis who directly
              transferred his employment from the Dixson Division of AMETEK,
              Inc. to the National Controls Corporation Division of AMETEK, Inc.
              ("NCC"), effective March 2, 2000 for David A. Gizewicz who
              directly transferred his employment from AMETEK, Inc. to NCC,
              effective January 1, 2000 for Walter B. Wooldridge new hire of
              NCC, effective April 1, 2000 for new hires Larry D. Augsburger and
              James F.Solari of NCC, and effective July 1, 2000 for John
              Meggesin new of NCC.

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

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

              FIRST: Appendix VI to the Plan is amended by renumbering Section 4
as Section 5, and adding a new Section 4 to read in its entirety as follows:

              "4.  The following employees of the National Controls Corporation
Division of AMETEK, Inc. ("NCC") shall be eligible to participate in the Plan as
of the respective dates set forth below:

                   Michael Davis            February 21, 2000
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                   David A. Gizewicz        March 2, 2000
                   Walter B. Wooldridge     January 1, 2000
                   Larry D. Augsburger      April 1, 2000
                   James F. Solari          April 1, 2000
                   John Meggesin            July 1, 2000"

              SECOND: The provisions of this Amendment No. 12 shall be effective
as of June 6, 2000.

              IN WITNESS WHEREOF, AMETEK has caused these presents to be
executed, in its corporate name, by its duly authorized officer on this 30th day
of June, 2000.

                                                 AMETEK, Inc.

                                                 By: /s/ Donna F. Winquist
                                                     ---------------------------

Attest:

/s/ Kathryn E. Londra
---------------------------

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