Document:

<PAGE>
                                                                  EXHIBIT 10.73

                                 SIXTH AMENDMENT
                          DATED AS OF NOVEMBER 30, 2001
                                       TO
                           RECEIVABLES SALE AGREEMENT
                           DATED AS OF OCTOBER 1, 1999

     THIS AMENDMENT (the "Amendment"), dated as of November 30, 2001, is entered
into among Ametek Receivables Corp. (the "Seller"), Ametek, Inc. (the "Initial
Collection Agent"), Amsterdam Funding Corporation, a Delaware corporation
("Amsterdam"), ABN AMRO Bank N.V., as Amsterdam's program letter of credit
provider (the "Enhancer"), the Liquidity Provider listed on the signature page
hereof (the "Liquidity Provider") and ABN AMRO Bank N.V., as agent for
Amsterdam, the Enhancer and the Liquidity Provider (the "Agent").

                                   WITNESSETH:

     WHEREAS, the Seller, Initial Collection Agent, Amsterdam, Enhancer,
Liquidity Provider and Agent have heretofore executed and delivered a
Receivables Sale Agreement, dated as of October 1, 1999 (as amended,
supplemented or otherwise modified through the date hereof, the "Sale
Agreement"),

     WHEREAS, the parties hereto desire to amend the Sale Agreement as provided
herein;

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

     Section 1. Subject to the following terms and conditions, including without
limitation the conditions precedent set forth in Section 3, upon execution by
the parties hereto in the space provided for that purpose below, the Sale
Agreement shall be, and it hereby is, amended as follows:

          (a) The defined term "Aggregate Commitment" appearing in Schedule I of
     the Sale Agreement is hereby deleted and replaced with the following:

               "Aggregate Commitment" means $76,500,000, as such amount may be
          reduced pursuant to Section 1.6.

          (b) The date "November 30, 2001" appearing in clause (d) of the
     defined term "Liquidity Termination Date" appearing in Schedule I of the
     Sale Agreement is deleted and replaced with the date "September 28, 2002".

          (c) The defined term "Purchase Limit" appearing in Schedule I of the
     Sale Agreement is hereby deleted and replaced with the following:

               "Purchase Limit" means $75,000,000.
<PAGE>
          (d) The date "November 30, 2001" appearing in clause (c)(ii) of the
     defined term "Termination Date" appearing in Schedule I of the Sale
     Agreement is deleted and replaced with the date "September 28, 2002".

          (e) Schedule II of the Sale Agreement is hereby deleted and replaced
     with Schedule II of this Amendment.

     Section 2. Concurrently with the execution hereof, Seller shall pay to
Agent for its own account a one-time amendment fee of $50,000 (the "Amendment
Fee").

     Section 3. This Amendment shall become effective on the date the Agent has
received (i) counterparts of this Amendment executed by the Seller, Initial
Collection Agent, each Purchaser and the Agent; and (ii) the Amendment Fee.

     Section 4. To induce the Agent and the Purchasers to enter into this
Amendment, the Seller and Initial Collection Agent represent and warrant to the
Agent and the Purchasers that: (a) the representations and warranties contained
in the Transaction Documents, are true and correct in all material respects as
of the date hereof with the same effect as though made on the date hereof (it
being understood and agreed that any representation or warranty which by its
terms is made as of a specified date shall be required to be true and correct in
all material respects only as of such specified date); (b) no Potential
Termination Event exists; (c) this Amendment has been duly authorized by all
necessary corporate proceedings and duly executed and delivered by each of the
Seller and the Initial Collection Agent, and the Sale Agreement, as amended by
this Amendment, and each of the other Transaction Documents are the legal, valid
and binding obligations of the Seller and the Initial Collection Agent,
enforceable against the Seller and the Initial Collection Agent in accordance
with their respective terms, except as enforceability may be limited by
bankruptcy, insolvency or other similar laws of general application affecting
the enforcement of creditors' rights or by general principles of equity; and (d)
no consent, approval, authorization, order, registration or qualification with
any governmental authority is required for, and in the absence of which would
adversely effect, the legal and valid execution and delivery or performance by
the Seller or the Initial Collection Agent of this Amendment or the performance
by the Seller or the Initial Collection Agent of the Sale Agreement, as amended
by this Amendment, or any other Transaction Document to which they are a party.

     Section 4.1. 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 4.2. Except as specifically provided above, the Sale Agreement and
the other Transaction Documents shall remain in full force and effect and are
hereby ratified and confirmed in all respects. The execution, delivery, and
effectiveness of this Amendment shall not operate as a waiver of any right,
power, or remedy of any Agent or any Purchaser under the Sale Agreement or any
of the other Transaction Documents, nor constitute a waiver or modification of
any provision of any of the other Transaction Documents. All defined terms used
herein and not defined herein shall have the same meaning herein as in the Sale
Agreement.

                                       -2-
<PAGE>
The Seller agrees to pay on demand all costs and expenses (including reasonable
fees and expenses of counsel) of or incurred by the Agent and each Purchaser
Agent in connection with the negotiation, preparation, execution and delivery of
this Amendment.

     Section 4.3. 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.

                                       -3-
<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.

                                        ABN AMRO BANK N.V., as the Agent, as the
                                         Liquidity Provider and as the Enhancer

                                        By: /s/ Thomas J. Educate
                                           -------------------------------------
                                        Title: SVP

                                        By: /s/ W. Robert Poff
                                           -------------------------------------
                                        Title: SVP

                                        AMSTERDAM FUNDING CORPORATION

                                        By: /s/ Andrew L. Stidd
                                           -------------------------------------
                                        Title: President

                                        AMETEK RECEIVABLES CORP.

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

                                        AMETEK, INC.

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

                                       -4-<PAGE>
                                                                  EXHIBIT 10.80

     FIRST SUPPLEMENTAL INDENTURE (the "First Supplement"), dated as of
September 17, 2001, is entered into by and among AMETEK, Inc., a Delaware
corporation (the "Company"), each of the undersigned subsidiaries of the Company
(each a "Subsidiary Guarantor" and collectively the "Subsidiary Guarantors"),
and CHASE MANHATTAN TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee (the
"Trustee").

                                   WITNESSETH:

     WHEREAS, the Company and the Trustee have executed and delivered an
Indenture, dated as of July 17, 1998, (the "Indenture"), providing for the
issuance by the Company of its 7.20% Senior Notes due 2008;

     WHEREAS, the Company has entered into a Credit Agreement, dated as of
September 17, 2001 with various financial institutions from time to time party
thereto (the "Banks"), First Union National Bank and PNC Bank N.A., as
syndication agents (each a "Syndication Agent" and, collectively, the
"Syndication Agents"), Deutsche Bank, as documentation agent (the "Documentation
Agent"), and The Chase Manhattan Bank, as administrative agent (in such
capacity, and together with its successors in such capacity, the "Administrative
Agent") for the Banks (as amended, restated, modified or supplemented from time
to time, the "Credit Agreement") and, in connection therewith, the Subsidiary
Guarantors have entered into guarantees (the "Bank Guarantees") of the Credit
Agreement;

     WHEREAS, Section 4.13 of the Indenture provides that under certain
circumstances the Subsidiary Guarantors shall execute and deliver to the Trustee
a supplemental indenture pursuant to which the Subsidiary Guarantors shall
unconditionally guarantee all of the Company's Obligations under the Securities
(as defined in the Indenture) on the terms and conditions set forth herein (the
"Guarantee");

     WHEREAS, pursuant to Section 9.01(6) of the Indenture, the Company, the
Subsidiary Guarantors and the Trustee may enter into this First Supplement
without the consent of any Holder; and

     WHEREAS, the execution and delivery of this First Supplement have been duly
authorized by a Board Resolution of the Boards of Directors or equivalent bodies
of the Company and the Subsidiary Guarantors;

     NOW, THEREFORE, in consideration of the above premises, each of the parties
hereto agrees, for the benefit of the others and for the equal and proportionate
benefit of the Holders of the Securities, as follows:
<PAGE>
                                   ARTICLE ONE
                              SUBSIDIARY GUARANTIES

     Section 1.01. Guaranties.

          (a) Each Subsidiary Guarantor hereby unconditionally and irrevocably
     guarantees, jointly and severally, to each Holder and to the Trustee the
     full and punctual payment of principal of and interest on the Securities
     when due, whether at maturity, by acceleration, by redemption or otherwise,
     and all other monetary obligations of the Company under the Indenture and
     the Securities (all the foregoing being hereinafter collectively called the
     "Guaranteed Obligations").

          (b) Each Subsidiary Guarantor waives presentation to, demand of,
     payment from and protest to the Company of any of the Guaranteed
     Obligations and also waives notice of protest for nonpayment. Each
     Subsidiary Guarantor waives notice of any default under the Securities or
     the Guaranteed Obligations. The obligations of each Subsidiary Guarantor
     hereunder shall not be affected by (a) the failure of any Holder or the
     Trustee to assert any claim or demand or to enforce any right or remedy
     against the Company or any other Person under the Indenture, the Securities
     or any other agreement or otherwise; (b) any extension or renewal of any
     thereof; (c) any rescission, waiver, amendment or modification of any of
     the terms or provisions of the Indenture, the Securities or any other
     agreement; (d) the release of any security held by any Holder or the
     Trustee for the Guaranteed Obligations or any of them; or (e) the failure
     of any Holder or the Trustee to exercise any right or remedy against any
     other guarantor of or surety for the Guaranteed Obligations.

          (c) Each Subsidiary Guarantor further agrees that this Guarantee
     constitutes a guarantee of payment when due (and not a guarantee of
     collection) and waives any right to require that any resort be had by any
     Holder or the Trustee to any security held for payment of the Guaranteed
     Obligations.

          (d) Except as expressly set forth in Sections 102 and 106 of this
     First Supplement and Article Eight of the Indenture, the obligations of
     each Subsidiary Guarantor hereunder shall not be subject to any setoff,
     reduction, limitation, impairment or termination for any reason, including
     any claim of waiver, release, surrender, alteration or compromise, and
     shall not be subject to any defense of setoff, counterclaim, recoupment or
     termination whatsoever or by reason of the invalidity, illegality or
     unenforceability of the Guaranteed Obligations or otherwise. Without
     limiting the generality of the foregoing, the obligations of each
     Subsidiary Guarantor herein shall not be discharged or impaired or
     otherwise affected by the failure of any Holder or the Trustee to assert
     any claim or demand or to enforce any remedy under the Indenture, the
     Securities or any other agreement, by any waiver or modification of any
     thereof, by any default, failure or delay, willful or otherwise, in the
     performance of the obligations, or by any other act or thing or omission or
     delay to do any other act or thing which may or might in any manner or to
     any extent vary the risk of such Subsidiary Guarantor or would otherwise
     operate as a discharge of such Subsidiary Guarantor as a matter of law or
     equity.

                                       2
<PAGE>
          (e) Each Subsidiary Guarantor further agrees that its obligations
     under this Guarantee shall continue to be effective or be reinstated, as
     the case may be, if at any time payment, or any part thereof, of principal
     of or interest on any Guaranteed Obligation is rescinded or must otherwise
     be restored by any Holder or the Trustee upon the bankruptcy or
     reorganization of the Company or otherwise.

          (f) In furtherance of the foregoing and not in limitation of any other
     right which any Holder or the Trustee has at law or in equity against any
     Subsidiary Guarantor by virtue hereof, upon the failure of the Company to
     pay the principal of or interest on any Guaranteed Obligation when and as
     the same shall become due, whether at maturity, by acceleration, by
     redemption or otherwise, or to perform any other Guaranteed Obligation,
     each Subsidiary Guarantor hereby promises to and will, upon receipt of
     written demand by the Trustee, forthwith pay, or cause to be paid, in cash,
     to the Holders or the Trustee an amount equal to the sum of (i) the unpaid
     amount of such Guaranteed Obligations, (ii) accrued and unpaid interest on
     such Guaranteed Obligations (but only to the extent not prohibited by law)
     and (iii) all other monetary Guaranteed Obligations of the Company to the
     Holders and the Trustee.

          (g) Each Subsidiary Guarantor further agrees that, as between it, on
     the one hand, and the Holders and the Trustee, on the other hand, (x) the
     maturity of the Guaranteed Obligations may be accelerated as provided in
     Article Six of the Indenture for the purposes of this Guarantee provided by
     such Subsidiary Guarantor, notwithstanding any stay, injunction or other
     prohibition preventing such acceleration in respect of the Guaranteed
     Obligations, and (y) in the event of any declaration of acceleration of
     such Guaranteed Obligations as provided in Article Six of the Indenture,
     such Guaranteed Obligations (whether or not due and payable) shall
     forthwith become due and payable by such Subsidiary Guarantor for the
     purposes of this Guarantee.

          (h) Each Subsidiary Guarantor also agrees to pay any and all costs and
     expenses (including reasonable attorneys' fees) incurred by the Trustee or
     any Holder in enforcing any rights under this Guarantee.

     Section 1.02. Limitation on Liability. Any term or provision of the
Indenture to the contrary notwithstanding, the maximum aggregate amount of the
Guaranteed Obligations guaranteed hereunder by any Subsidiary Guarantor shall
not exceed the maximum amount that will, after giving effect to all other
contingent and fixed liabilities of such Subsidiary Guarantor (including,
without limitation, any guarantees under the Credit Agreement) and after giving
effect to any collections from or payments made by or on behalf of any other
Subsidiary Guarantor in respect of the obligations of such other Subsidiary
Guarantor under its Guarantee or pursuant to its contribution obligations under
the Indenture, result in the obligations of such Subsidiary Guarantor under this
Guarantee not constituting a fraudulent conveyance or fraudulent transfer under
any bankruptcy, insolvency, fraudulent conveyance or similar laws affecting the
rights of creditors generally under federal or state law.

                                       3
<PAGE>
     Section 1.03. Successors and Assigns. This Article One shall be binding
upon each Subsidiary Guarantor and its successors and assigns and shall inure to
the benefit of the successors and assigns of the Trustee and the Holders and, in
the event of any transfer or assignment of rights by any Holder or the Trustee,
the rights and privileges conferred upon that party in the Indenture and in the
Securities shall automatically extend to and be vested in such transferee or
assignee, all subject to the terms and conditions of the Indenture.

     Section 1.04. No Waiver. Neither a failure nor a delay on the part of
either the Trustee or the Holders in exercising any right, power or privilege
under this Article One shall operate as a waiver thereof, nor shall a single or
partial exercise thereof preclude any other or further exercise of any right,
power or privilege. The rights, remedies and benefits of the Trustee and the
Holders herein expressly specified are cumulative and not exclusive of any other
rights, remedies or benefits which either may have under this Article One at
law, in equity, by statute or otherwise.

     Section 1.05. Modification. No modification, amendment or waiver of any
provision of this Article One, nor the consent to any departure by any
Subsidiary Guarantor therefrom, shall in any event be effective unless the same
shall be in writing and signed by the Trustee, and then such waiver or consent
shall be effective only in the specific instance and for the purpose for which
given. No notice to or demand on any Subsidiary Guarantor in any case shall
entitle such Subsidiary Guarantor to any other or further notice or demand in
the same, similar or other circumstances.

     Section 1.06. Release or Discharge of Subsidiary Guarantor. Upon (i) the
sale or other disposition (including by way of consolidation or merger or
otherwise) of a Subsidiary Guarantor or the sale or disposition of all or
substantially all the assets of such Subsidiary Guarantor (in each case other
than to the Company or an Affiliate of the Company and whether or not an
Affiliate of the Subsidiary Guarantor) in compliance with the Indenture
(including any applicable provisions of Article Five thereof), or (ii) the
termination, performance or release of such Subsidiary Guarantor's liability
under the Bank Guaranties, such Subsidiary Guarantor shall be deemed released
from all Guaranteed Obligations under the Indenture without any further action
required on the part of the Trustee or any Holder and its Guarantee and such
Guarantee shall terminate; provided, however, that such termination shall occur
only to the extent that all obligations of such Subsidiary Guarantor under the
Credit Agreement and the Bank Guaranties shall also terminate upon such release,
sale or transfer. In the event and to the extent that the Company is discharged
from any of its obligations under the Indenture pursuant to the provisions of
Article Eight thereof, the Subsidiary Guarantors shall also be so discharged. At
the request of the Company, the Trustee shall execute and deliver any
appropriate instrument evidencing such release or discharge.

     Section 1.07. Right of Contribution. Each Subsidiary Guarantor hereby
agrees that to the extent that a Subsidiary Guarantor shall have paid more than
its pro rata share (based on the net worth of each Subsidiary Guarantor) of any
payment made hereunder, such Subsidiary Guarantor shall be entitled to seek and
receive contribution from and against any other Subsidiary Guarantor hereunder
who has not paid its pro rata share of such payment. Each Subsidiary Guarantor's
right of contribution shall be subject to the terms and conditions of

                                       4
<PAGE>

Section 1.08 of this First Supplement. The provisions of this Section 1.07 shall
in no respect limit the Guaranteed Obligations and liabilities of any Subsidiary
Guarantor to the Trustee and the Holders and each Subsidiary Guarantor shall
remain liable to the Trustee and the Holders for the full amount guaranteed by
such Subsidiary Guarantor hereunder.

     Section 1.08. No Subrogation. Notwithstanding any payment or payments made
by any of the Subsidiary Guarantors hereunder, no Subsidiary Guarantor shall be
entitled to be subrogated to any of the rights of the Trustee or any Holders
against the Company or any other Subsidiary Guarantor or any collateral security
or guarantee or right of offset held by the Trustee or any Holder for the
payment of the Guaranteed Obligations, nor shall any Subsidiary Guarantor seek
or be entitled to seek any contribution or reimbursement from the Company or any
other Subsidiary Guarantor in respect of payments made by such Subsidiary
Guarantor hereunder, until all amounts owing to the Trustee and the Holders by
the Company are paid in full. If any amount shall be paid to any Subsidiary
Guarantor on account of such subrogation rights at any time when all of the
Guaranteed Obligations shall not have been paid in full, such amount shall be
held by such Subsidiary Guarantor in trust for the Trustee and the Holders.

     Section 1.09 Additional Subsidiary Guarantors. If, after the date hereof,
any Subsidiary of the Company is required, pursuant to the Indenture, to become
a Subsidiary Guarantor, it may do so by executing a separate counterpart of this
First Supplement and delivering the same to the Trustee, it being agreed that
upon doing so such Subsidiary shall be a Subsidiary Guarantor for all purposes
hereof.

                                   ARTICLE TWO
                                  MISCELLANEOUS

     Section 2.01. Defined Terms; Continuing Effectiveness. Except as otherwise
expressly provided or unless the context otherwise requires, all terms used
herein which are defined in the Indenture shall have the meanings assigned to
them in the Indenture. As supplemented hereby, the Indenture and the Securities
are in all respects ratified and confirmed and all the terms and provisions
thereof shall remain in full force and effect.

     Section 2.02. Effective Date. This First Supplement shall be effective as
of the close of business on the date hereof.

     Section 2.03 Notices. All notices, requests, demands or other
communications pursuant hereto shall be deemed to have been duly given or made
when delivered to the Person to which such notice, request, demand or other
communication is required or permitted to be given or made under this Guarantee,
addressed to such party (i) in the case of the Trustee or the Company, as
provided in the Indenture and (ii) in the case of any Subsidiary Guarantor, at
its address set forth opposite its signature below; or in any case at such other
address as any of the Persons listed above may hereafter notify the others in
writing.

     Section 2.04. Headings. The Section headings herein are for convenience
only and shall not affect the construction hereof.

                                       5
<PAGE>
     Section 2.05. The Trustee. The Trustee shall not be responsible in any
manner whatsoever for or in respect of the validity or sufficiency of this First
Supplement or for or in respect of the recitals contained herein, all of which
recitals are made solely by the Guaranteeing Subsidiary and the Company.

     Section 2.06 No Recourse. In accordance with Section 10.10 of the
Indenture, a director, officer, employee, stockholder or incorporator, as such,
of any Subsidiary Guarantor shall not have any liability for any obligations of
the Company or Subsidiary Guarantor under the Securities, the Indenture or this
First Supplement or for any claim based on, in respect of, or by reason of, such
obligations or their creation. Each Securityholder by accepting a Security
waives and releases all such liability. The waiver and release are part of the
consideration for issuance of the Securities.

     Section 2.07. Governing Law. THIS FIRST SUPPLEMENT SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE JURISDICTION WHICH GOVERN THE
INDENTURE AND ITS CONSTRUCTION.

     Section 2.08. Counterparts. This First Supplement may be executed in any
number of counterparts each of which shall be an original, but such counterparts
shall together constitute but one and the same instrument.

                                       6
<PAGE>
     IN WITNESS WHEREOF, the parties hereto have caused this First Supplement to
be duly executed and their respective seals to be affixed hereunto and duly
attested all as of the day and year first above written.

                                            AMETEK, Inc.

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

<TABLE>
<S>                                         <C>

C/o AMETEK, Inc.                            AMELON, Inc.
37 North Valley Road
Paoli, Pennsylvania 19301
Attention: Chief Financial Officer          By: /s/ Deirdre D. Saunders
Tel. No. (610) 647-2121                        ---------------------------------
Fax. No. (610) 296-3412                     Title: Treasurer

C/o AMETEK, Inc.                            AMETEK Motors Holding, Inc.
37 North Valley Road
Paoli, Pennsylvania  19301
Attention: Chief Financial Officer          By: /s/ Deirdre D. Saunders
Tel. No. (610) 647-2121                        ---------------------------------
Fax. No. (610) 296-3412                     Title: Treasurer

C/o AMETEK, Inc.                            EMA CORPORATION
37 North Valley Road
Paoli, Pennsylvania  19301
Attention: Chief Financial Officer          By: /s/ Deirdre D. Saunders
Tel. No. (610) 647-2121                        ---------------------------------
Fax. No. (610) 296-3412                     Title: Treasurer

C/o AMETEK, Inc.                            John Chatillon & Sons, Inc.
37 North Valley Road
Paoli, Pennsylvania  19301
Attention: Chief Financial Officer          By: /s/ Deirdre D. Saunders
Tel. No. (610) 647-2121                        ---------------------------------
Fax. No. (610) 296-3412                     Title: Treasurer
</TABLE>

                                       7
<PAGE>

<TABLE>
<S>                                         <C>

C/o AMETEK, Inc.                            Rotron Incorporated
37 North Valley Road
Paoli, Pennsylvania  19301
Attention: Chief Financial Officer          By: /s/ Deirdre D. Saunders
Tel. No. (610) 647-2121                        ---------------------------------
Fax. No. (610) 296-3412                     Title: Treasurer

C/o AMETEK, Inc.                            NCC Holdings, Inc.
37 North Valley Road
Paoli, Pennsylvania  19301
Attention: Chief Financial Officer          By: /s/ Deirdre D. Saunders
Tel. No. (610) 647-2121                        ---------------------------------
Fax. No. (610) 296-3412                     Title: Treasurer

C/o AMETEK, Inc.                            AMETEK National Controls Corporation
37 North Valley Road
Paoli, Pennsylvania  19301
Attention: Chief Financial Officer          By: /s/ Deirdre D. Saunders
Tel. No. (610) 647-2121                        ---------------------------------
Fax. No. (610) 296-3412                     Title: Treasurer

C/o AMETEK, Inc.                            Controls Holding Corporation
37 North Valley Road
Paoli, Pennsylvania  19301
Attention: Chief Financial Officer          By: /s/ Deirdre D. Saunders
Tel. No. (610) 647-2121                        ---------------------------------
Fax. No. (610) 296-3412                     Title: Treasurer

C/o AMETEK, Inc.                            Patriot Sensors & Controls Corporation
37 North Valley Road
Paoli, Pennsylvania  19301
Attention: Chief Financial Officer          By: /s/ Deirdre D. Saunders
Tel. No. (610) 647-2121                        ---------------------------------
Fax. No. (610) 296-3412                     Title: Treasurer
</TABLE>

                                       8
<PAGE>

<TABLE>
<S>                                         <C>

C/o AMETEK, Inc.                            EDAX Inc.
37 North Valley Road
Paoli, Pennsylvania  19301
Attention: Chief Financial Officer          By: /s/ Elvin J. Stoltzfus
Tel. No. (610) 647-2121                        ---------------------------------
Fax. No. (610) 296-3412                     Title: Treasurer

C/o AMETEK, Inc.                            TEXSEM Laboratories, Inc.
37 North Valley Road
Paoli, Pennsylvania  19301
Attention: Chief Financial Officer          By: /s/ Elvin J. Stoltzfus
Tel. No. (610) 647-2121                        ---------------------------------
Fax. No. (610) 296-3412                     Title: Treasurer

</TABLE>

                                            CHASE MANHATTAN TRUST COMPANY,
                                            NATIONAL ASSOCIATION

                                            By: /s/ Catherine Lenhardt
                                               ---------------------------------
                                            Title: Vice President

                                       9

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