Document:

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                                                                   EXHIBIT 10.46

                                    AMENDMENT

                                     TO THE

                   EMPLOYEE'S RETIREMENT PLAN OF AMETEK, INC.

                                 AMENDMENT NO. 4

         WHEREAS, there was adopted and made effective as of December 29, 1942,
the Employee's Retirement Plan of AMETEK, Inc. (the "Plan"); and

         WHEREAS, the Plan was amended and restated in its entirety effective
January 1, 1998; and

         WHEREAS, Section 9.2 of the Plan provides that the Board of Directors
of AMETEK, Inc. ("AMETEK") may amend the Plan at any time, and from time to
time; and

         WHEREAS, AMETEK now desires to make certain amendments necessary to
secure a favorable letter of determination with respect to the Plan's
tax-qualified status;

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

         FIRST: The third sentence of Section 1.11 of the Plan is hereby amended
to read, in its ----- entirety, as follows:

                  "In determining the "Compensation" of an Employee for purposes
         of this limitation for years prior to January 1, 1997, the aggregation
         rules of Section 414(q)(6) of the Code (as in effect prior to January
         1, 1997) shall apply to any Employee who is a member of a family of a
         5% owner (within the meaning of Section 416(i) of the Code) or a Highly
         Compensated Employee (as defined in Section 414(q) of the Code and as
         such definition is applied under other qualified retirement plans of
         the Employer) in the group consisting of the 10 employees paid the
         highest compensation."

                  SECOND: The last sentence of Section 1.18 of the
         Plan is hereby amended to read, in its entirety, as follows:

                  "Notwithstanding the foregoing, the term "Employee" shall not
         include any person whom the Employer determines, in its sole discretion
         based on the criteria set forth in Treas. Reg. Section 31.3401(c)-1, is
         not a common law employee. If a person who is not classified as an
         Employee otherwise satisfies the requirements of this Section 1.18 and
         is subsequently reclassified by the Employer as an

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         Employee, such person, for purposes of this Plan, shall be deemed an
         Employee from the later of the actual or the effective date of such
         reclassification."

         THIRD: Section 3.6 of the Plan is hereby amended by adding a sentence
at the conclusion thereof to read, in its entirety, as follows:

                  "Effective December 12, 1994, notwithstanding anything in this
         Plan to the contrary, Credited Service with respect to periods of
         qualified military service will be provided in accordance with Section
         414(u) of the Code."

         FOURTH: Section 4.4(a) of the Plan is hereby amended to substitute the
term "Credited Service" for the term "Vesting Service" in the seventh line
thereof.

         FIFTH: Section 4.6(b) of the Plan is hereby amended to read, in its
entirety, as follows:

                  "(b) Form of Payment. If the annual benefit is paid in a form
         other than a straight life annuity or a Qualified Joint and Survivor
         Annuity, the limitations of this Section 4.6 shall apply to the annual
         benefit by adjusting it so that it is the actuarial equivalent of a
         straight life annuity using an interest rate of 5% or the rate
         specified in Section 1.2, whichever is greater, and the mortality table
         described in Section 417(e)(3) of the Code."

         SIXTH: Section 4.6(c) of the Plan is hereby amended to read, in its
entirety, as follows:

                  "(c) Adjustment of Limitation. If payment of the annual
         benefit begins before the Participant or Former Participant attains his
         Social Security Retirement Age, the $90,000 limit contained in
         Subsection (a)(i) shall be adjusted so that it is the actuarial
         equivalent of an annual benefit of $90,000, multiplied by the
         Adjustment Factor, beginning at the Participant's or Former
         Participant's Social Security Retirement Age. The adjustment provided
         for in the preceding sentence shall be consistent with the reduction
         for old-age insurance benefits commencing before the Social Security
         Retirement Age under the Social Security Act for benefits that begin to
         be paid on or after age 62 using the mortality table described in
         Section 417(e)(3) of the Code, and the interest rate assumption used in
         adjusting the benefit for years prior to age 62 shall not be less than
         the greater of 5% or the rate specified in Section 1.2. If payment of
         the annual benefit of a Participant or Former Participant begins after
         the Participant or Former Participant attains his Social Security
         Retirement Age, the $90,000 limit contained in Subsection (a)(i) shall
         be adjusted so that it is the actuarial equivalent of a benefit of
         $90,000, multiplied by the Adjustment Factor, beginning at his Social
         Security Retirement Age; provided that the interest rate assumption
         used for such calculation shall not be greater than the lesser of 5% or
         the rate specified in Section 1.2."

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         SEVENTH: Section 5.11(b) of the Plan is hereby amended by adding a
sentence at the conclusion thereof to read, in its entirety, as follows:

                  "If distribution of benefit is considered to have commenced
         before the death of the Participant (as determined under Section
         401(a)(9) of the Code and the regulations thereunder), any remaining
         interest will be distributed at least as rapidly as under the method of
         distribution in effect at the time of the Participant's death."

         EIGHTH: The first sentence of Section 9.6(a) of the Plan is hereby
amended to read, in its entirety, as follows:

                  "In the event of Plan termination, the benefit payable to any
         highly compensated employee or any highly compensated former employee
         (as defined in Section 414(q) of the Code and as such definition is
         applied under other qualified retirement plans of the Employer) shall
         be limited to a benefit that is nondiscriminatory under Section
         401(a)(4) of the Code."

         NINTH: The provisions of this Amendment shall be effective as of
January 1, 1997.

         IN WITNESS WHEREOF, AMETEK has caused these presents to be executed, in
its corporate name, by its duly authorized officer, and its corporate seal to be
affixed on this 27th day of July, 1999.

                                     AMETEK, Inc.

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

Attest:

/s/ Kathryn E. Londra
---------------------
(Seal)<PAGE>   1
                                                                   EXHIBIT 10.47
                                    AMENDMENT

                                     TO THE

                           EMPLOYEES' RETIREMENT PLAN
                                 OF AMETEK, INC.

                                 AMENDMENT NO. 5

         WHEREAS, there was adopted and made effective as of December 29, 1942,
the Employees' Retirement Plan of AMETEK, Inc. (the "Plan"); and

         WHEREAS, the Plan was amended and restated in its entirety, effective
January 1, 1998; and

         WHEREAS, Section 9.2 of the Plan provides that AMETEK, Inc. ("AMETEK")
may amend the Plan at any time or 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: A new Appendix XXXII is hereby added to the Plan, to read in its
entirety as follows:

                                 APPENDIX XXXII
                     SPECIAL PROVISIONS RELATING TO CERTAIN
                 EMPLOYEES TRANSFERRING TO THE NATIONAL CONTROLS
                      CORPORATION DIVISION OF AMETEK, INC.

         1. The provisions of this Appendix XXXII shall apply only to the
following employees of the National Controls Corporation Division of AMETEK,
Inc. ("NCC"), Shawn Cabin, Arlin Demerer, William Gladfelter, Richard Grudzien,
Dorothy Jones, Frank Kay, Insoon Kim, Stephan Kunca, Charles Laufer, Thomas
Ryan, Charles Sheridan, John Thacker and Ervin Whitfield (the "Covered
Employees"), who directly transferred their employment from the Panalarm
Division of AMETEK, Inc. ("Panalarm") to NCC upon the dissolution of Panalarm by
the Company.

         2. Each of the Covered Employees shall remain eligible to participate
in the Plan upon his transfer to NCC.

         3. Except to the extent set forth above, defined terms used in this
Appendix XXXII shall have the same meaning as used in the Plan.
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         SECOND: The provisions of this Amendment No. 5 shall be effective as of
August 13, 1999.

         IN WITNESS WHEREOF, AMETEK has caused these presents to be executed in
its corporate name, by its duly authorized officer on this 7th day of September,
1999.

                                  AMETEK, Inc.

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

Attest:

/s/ Kathryn E. Londra
-----------------------------<PAGE>   1
                                                                   EXHIBIT 10.48
                                 AMENDMENT NO. 6

                                     TO THE

                           EMPLOYEES' RETIREMENT PLAN
                                 OF AMETEK, INC.

         WHEREAS, there was adopted and made effective as of December 29, 1942,
the Employees' Retirement Plan of AMETEK, Inc. (the "Plan"); and

         WHEREAS, the Plan was amended and restated in its entirety, effective
January 1, 1998; and

         WHEREAS, Section 9.2 of the Plan provides that AMETEK, Inc. ("AMETEK")
may amend the Plan at any time or 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: A new Appendix XXXIII is hereby added to the Plan, to read in
its entirety as follows:

                                 APPENDIX XXXIII
                          SPECIAL PROVISIONS RELATING TO CERTAIN
               EMPLOYEES OF THE AEROSPACE DIVISION OF AMETEK, INC.

         1. The AMETEK, Inc. Aerospace Division Employees' Retirement Plan (the
         "Aerospace Plan") shall be merged into, and continued as part of the
         Plan effective as of the close of business, December 31, 1999 (the
         "Amendment Effective Date"), and the assets under the AMETEK, Inc.
         Employees' Master Retirement Trust allocable to the Aerospace Plan
         shall be transferred to the Plan as soon as practicable immediately
         thereafter.

         2. The provisions of this Appendix XXXIII shall apply to each active
         employee of the Aerospace Division of AMETEK, Inc. (the "Aerospace
         Division") who is a "Participant" as defined in the Aerospace Plan on
         the Amendment Effective Date and who becomes a Participant in the Plan
         on the Amendment Effective Date as a result of the merger of the
         Aerospace Plan with and into the Plan. Each such person shall be
         referred to as an "Aerospace Participant" for purposes of this Appendix
         XXXIII.

         3. Any former employee of the Aerospace Division who separated from
         service entitled to a deferred vested pension benefit as determined
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         under the terms of the Aerospace Plan or who is receiving a pension
         benefit as determined under the terms of the Aerospace Plan prior to
         the Amendment Effective Date (each a "Former Aerospace Participant") or
         any beneficiary of a Former Aerospace Participant who is receiving or
         becomes entitled to receive such benefits under the Aerospace Plan
         shall receive such benefits at the same times and in the same amounts
         as provided in the Aerospace Plan, determined under the terms of the
         Aerospace Plan as of the date the Former Aerospace Participant
         separated from service with the Aerospace Division, but payable from
         the Plan. Determinations, elections, designations and directions made
         by Former Aerospace Participants under the terms of the Aerospace Plan
         shall remain in effect under the Plan, unless changes, modified or
         otherwise revoked in accordance with the terms of the Plan.

         4. Each Aerospace Participant's benefits shall be determined in
         accordance with the provisions of the Plan; provided, however the
         following modifications shall apply:

                  (a) Section 1.1 (a) shall be modified by substituting
                  "Thirty-two and a half percent (32.5%) for "Thirty-two percent
                  (32%);

                  (b) Section 4.5(f) shall be modified by substituting for the
                  portion of the last sentence beginning with "a single sum
                  death benefit" the following: "a single sum death benefit in
                  the amount of $5,000 will be paid to his Beneficiary,
                  provided, however, that in the case of any Pensioner described
                  in this Subsection (f) who had directly transferred his
                  employment from GE to the Company on August 7, 1989 and who,
                  as of the August 7, 1989, had attained age 50 but had not
                  satisfied the requirements for eligibility to retire under the
                  GE Plan, the amount of the single sum death benefit payable to
                  a Pensioner's Beneficiary pursuant to this Subsection (f)
                  shall be $1,000.

                  (c) An Aerospace Participant who directly transferred his
                  employment from GE to AMETEK Aerospace Products, Inc. on
                  August 7, 1989, and who retires on or after his 60th birthday
                  and commences receiving a pension prior to his 65th birthday
                  pursuant to Section 4.2 or 4.3 shall be eligible for a
                  supplemental pension benefit if, as of August 7, 1989, (i) the
                  sum of such Participant's age (with each full month to be
                  counted as 1/12th of a year) and Credited Service totaled 50,
                  and (ii) such Aerospace Participant had not satisfied the
                  requirements for eligibility to retire under the GE Pension
                  Plan as of August 8, 1989. An Aerospace Participant's
                  supplemental pension benefit shall be in a monthly amount
                  equal to $190, and shall be payable commencing on the date on
                  which his pension commences pursuant to Section 4.2 or 4.3, as
                  the case may be, and continuing up to, but not including the
                  first day of the month in which he
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                  attains age 65 or, if earlier, the first day of the month
                  following the month in which he dies.

                  5. An Aerospace Participant's Vesting Service under the Plan
                  shall equal the sum of (i) his or her Vesting Service earned
                  under the Aerospace Plan up to the Amendment Effective Date
                  and (ii) his or her Vesting Service earned under the Plan
                  after the Amendment Effective Date. Notwithstanding the
                  foregoing, an Aerospace Participant shall not be credited with
                  more than one year of Vesting Service with respect to the 1999
                  calendar year or any other 12-month period.
 .
                  6. An Aerospace Participant's Credited Service under the Plan
                  shall equal the sum of (i) his or her Vesting Service earned
                  under the Aerospace Plan up to the Amendment Effective Date
                  and (ii) his or her Credited Service earned under the Plan
                  after the Amendment Effective Date. Notwithstanding the
                  foregoing, an Aerospace Participant shall not be credited with
                  more than one year of Credited Service with respect to the
                  1999 calendar year or any other 12-month period.

                  7. Except to the extent set forth above, defined terms used in
                  this Appendix XXXIII shall have the same meaning as used in
                  the Plan.

                  IN WITNESS WHEREOF, AMETEK has caused these presents to be
executed in its corporate name, by its duly authorized officer on this 22nd day
of December, 1999.

                                  AMETEK, Inc.

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

Attest:

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

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