Document:

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Eastern Bank

                                                     May 20, 1999

International Electronics, Inc.
427 Turnpike Street
Canton, Massachusetts 02021
Attn:  John Waldstein, President and Treasurer

Gentlemen:

         Reference is made to our Demand Loan and Security Agreement Accounts
Receivable and Inventory dated February 28, 1997, together with all amendments
and additions thereto (hereinafter called the "Agreement"). Notwithstanding the
provisions of the Agreement, it is agreed, effective immediately, that the
Agreement shall be amended as follows:

         1. Section 5.A. of the Agreement is hereby stricken in its entirety
and the following new Section 5.A. substituted therefor:

               "A. Subject to the terms and provisions of this Agreement, the
         Bank hereby establishes a discretionary revolving line of credit in
         Borrower's favor in the amount set forth below, as determined by Bank
         from time to time hereafter. Bank may make such loans to Borrower,
         based upon such facts and circumstances existing at the time of the
         request, as from time to time Bank elects to make which are secured by
         Borrower's Inventory, Accounts and all other Collateral and the
         proceeds thereof. Without limiting the discretionary nature of Bank's
         obligation to make loans hereunder, or the demand feature of any loans
         that Bank does make hereunder, Borrower agrees that the aggregate
         unpaid principal of all direct loans plus the sum of the aggregate
         amount undrawn on all letters of credit and acceptances shall not
         exceed the sum of One Million ($1,000,000.00) Dollars. All such loans
         shall bear interest and at the option of Bank shall be evidenced by
         demand notes in form satisfactory to Bank, but in the absence of notes
         shall be conclusively evidenced by the Bank's record of disbursements
         and repayments and shall be payable ON DEMAND. Interest will be charged
         to Borrower at a fluctuating rate which is the daily equivalent to the
         Base Rate in effect from time to time, or at such other rate agreed on
         from time to time by the parties, upon any balance owing to Bank at the
         close of each day and shall be payable monthly in arrears, on the first
         day of each month, until the Bank makes demand. The rate of interest
         payable by Borrower shall be changed effective as of that date in which
         a change in the Base Rate becomes effective. Interest shall be computed
         on the basis of the actual number of days elapsed over a year of three
         hundred sixty (360) days. The term "Base Rate" as

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         used herein and in any supplement and amendment hereto shall mean the
         rate of interest announced from time to time by Bank, at its head
         office, as its Base Rate, it being understood that such rate is a
         reference rate and not necessarily the lowest rate of interest charged
         by the Bank. The Base Rate on the date hereof is agreed to be seven and
         three-quarters (7 3/4%) percent."

         2. Section 6 of the Agreement is hereby stricken in its entirety and
the following new Section 6 substituted therefor:

                  "6. DEFINITION OF QUALIFIED ACCOUNT. This section has been
         intentionally reserved."

         3. Section 7 of the Agreement is hereby stricken in its entirety and
the following new Section 7 substituted therefor:

                  "7. DEFINITION OF ELIGIBLE INVENTORY. This section has been
         intentionally reserved."

         4. Section 13(d) of the Agreement is hereby stricken in its entirety
and the following new Section 13(d) substituted therefor:

                  "(d) Borrower will at all times keep accurate and complete
         records of Borrower's Inventory, Accounts and other Collateral, and
         Bank, or any of its agents, shall have the right to call at Borrower's
         place or places of business at intervals to be determined by Bank, and
         without hindrance or delay, to inspect, audit, check, and make extracts
         from any copies of the books, records, journals, orders, receipts,
         correspondence which relate to Borrower's Accounts, and other
         Collateral or other transactions, between the parties thereto and the
         general financial condition of Borrower and Bank may remove any of such
         records temporarily for the purpose of having copies made thereof.
         Absent the occurrence of an Event of Default which is continuing,
         Borrower shall not be obligated to pay to Bank an audit fee in
         connection with any such audit or inspection."

         5. Section 14(a) of the Agreement is hereby stricken in its entirety
and the following new Section 14(a) substituted therefor:

                  "(a) (Debt to Worth) permit the aggregate amount of its
         indebtedness to be more than one and one-half (1 1/2) times the amount
         of its tangible net worth on the last day of any fiscal year beginning
         with the fiscal year ending August 31, 1998, or the last day of the
         month of February, 1999, commencing February 28, 1999;"

         6. The Agreement is hereby amended by adding the following new Section
14(m) thereto:

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                  "(m) (Minimum Net Earnings) permit the net after tax earnings
         of Borrower for the six (6) month period ending on the last day of
         February of each year or the twelve (12) month period ending on the
         last day of August of each year to be less than One ($1.00) Dollar."

         Kindly note that the alterations contained herein do not in any way
alter, release or change any other sections contained in the Agreement.

         Please acknowledge your agreement to the foregoing by signing the
enclosed copy of this letter and returning the same to the undersigned.

                                Very truly yours,

                                EASTERN BANK

                                By: /s/ Alan Roberts
                                   ----------------------------
                                   Alan Roberts, Vice President

UNDERSTOOD AND AGREED TO:

INTERNATIONAL ELECTRONICS, INC.

By: /s/ John Waldstein
   ------------------------------------------------------
      John Waldstein, President and Treasurer

                                      -3-<PAGE>

                            LINE OF CREDIT AGREEMENT
                        FOR THE ACQUISITION OF EQUIPMENT

                                December 11, 2001

International Electronics, Inc.
427 Turnpike Street
Canton, Massachusetts 02021
Attn:  John Waldstein, President and Treasurer

Gentlemen:

     We (hereinafter "Bank") are pleased to advise you (hereinafter referred to
as the "Borrower") that Bank has established a line of credit of up to Five
Hundred Thousand ($500,000.00) Dollars (hereinafter the "Credit Limit") for
Borrower to be used exclusively for the purchase of new or used equipment;
subject to Bank's periodic review. This line of credit will be subject to the
following terms and conditions:

     1. Any advances, extensions of credit, or loan of funds pursuant to this
line of credit (hereinafter collectively and separately referred to as the
"Loan") will be made only if in the opinion of Bank there has been no material
adverse change of circumstances and if there exists no Event(s) of Default (as
hereinafter defined). No advances, extensions of credit or loan of funds will be
made on or after February 28, 2003. Any sums repaid hereunder shall not be
readvanced.

     2. Borrower may draw upon this line of credit from time to time by
presenting to Bank for each Loan: (i) an invoice from the vendor of such
equipment in a form reasonably acceptable to Bank, which includes, without
limitation, the purchase price of such equipment, including all accessions
thereto, net of all discounts, rebates, and other dealer or manufacturer
incentives; (ii) a certificate of origin, bill of sale, or other documentation
reasonably satisfactory to Bank indicating whether the equipment being purchased
is new or used (hereinafter referred to as the "Equipment Documentation"); and
(iii) an Equipment Documentation Certification in the form of Exhibit A annexed
hereto. Except for the last draw which may be in the amount of the unused
portion of the Credit Limit, all draws will be in amounts equal to or greater
than Fifty Thousand ($50,000.00) Dollars.

     3. The aggregate principal amount of any Loan made against any Equipment
Documentation shall not exceed the lesser of (i) the Credit Limit, less any
previous Loan, or (ii) one hundred (100%) percent of the net purchase price
(exclusive of any soft costs, transportation or installation charges) of the new
equipment referred to therein, or (iii) seventy (70%) percent of the net
purchase price (exclusive of any soft costs, transportation or installation
charges) of the used equipment referred to therein, provided, however, that the
above limit may be exceeded if the Bank's appraisal (conducted on an auction
value basis) of Borrower's equipment would exceed the limit for the purpose of
purchasing used equipment.

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     4. The aggregate principal amount of any Loan made hereunder shall be
payable in thirty-six (36) successive equal monthly installments over a term
that begins on the first day of themonth which begins not less than thirty (30)
days after the date of such Loan with the proviso that all Loans shall become
due and payable upon (a) the occurrence of an Event of Default (other than the
Event of Default described in Section 15(a) of the Demand Loan and Security
Agreement Accounts Receivable and Inventory between Bank and Borrower dated
February 28, 1997 (the "Loan Agreement"), or (b) one (1) year after the
occurrence of the Event of Default described in Section 15(a) of the Loan
Agreement. All such loans, at the option of Bank, shall be evidenced by
promissory notes in form satisfactory to Bank, but in the absence of notes,
shall be conclusively evidenced by Bank's records of disbursements and
repayments.

     5. Interest, net of those loans (if any) which bear interest at a fixed
rate of interest (as defined in the following paragraph), will be charged to
Borrower at a rate which is the daily equivalent to the Base Rate in effect from
time to time plus one (1%) percent per annum, or such other rate as Bank and
Borrower may from time to time agree to, upon any balance owing to Bank at the
close of each day. The rate of interest payable by Borrower shall be changed
effective as of that date in which a change in the Base Rate becomes effective.
Interest shall be computed on the basis of the actual number of days elapsed
over a year of three hundred sixty (360) days. Such interest shall be payable
monthly in arrears on the first (1st) day of each month, commencing on the first
of such dates next succeeding the date hereof.

     At Borrower's option, interest, net of those loans (if any) which bear
interest calculated by reference to the Base Rate, will be charged to Borrower
at a fixed rate which is equivalent to the then Cost of Funds Rate, but in no
event shall such interest rate be less than seven (7%) percent per annum, such
election by Borrower to be made on the date of the making of the applicable loan
by Bank to Borrower.

     The term "Base Rate" as used herein and in any supplement and amendment
hereto shall mean the per annum rate of interest announced from time to time by
Bank, at its head office, as its Base Rate, it being understood that such rate
is a reference rate and not necessarily the lowest rate of interest charged by
the Bank. The Base Rate on the date hereof is agreed to be five (5%) percent.

     The term "Cost of Funds Rate" as used herein means the sum of (a) the fixed
per annum rate of interest as of the date of the applicable Loan determined by
Bank in good faith in accordance with Bank's customary practices for loans in
United States currency and based on Bank's cost of obtaining funds with a
maturity approximately equal to the period between the date the Cost of Funds
Rate Loan is to be made and the maturity of the applicable Loan from sources as
may be selected by Bank in its sole and absolute discretion, plus (b) two and
three-quarters of one (2.75%) percent per annum (i.e., two hundred seventy-five
(275) basis points).

     Upon the occurrence of an Event of Default hereunder, interest on unpaid
balances shall thereafter be payable at an interest rate per annum equal to
three (3%) percent greater than the rate of interest specified herein.

     6. Borrower will pay or reimburse Bank for all reasonable expenses,
including attorneys' fees, which Bank may in any way incur in connection with
this agreement or any other agreement between Borrower and Bank or with any Loan
or which result from any claim or action by any third person against Bank which
would not have been asserted were it not for Bank's relationship with Borrower
hereunder or otherwise.

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     7. Upon the occurrence of any one or more of the following events
(hereinafter "Events of Default"), any and all obligations of Borrower to Bank
shall become immediately due and payable, at the option of Bank and without
notice or demand:

     (a) The failure by Borrower to pay when due any amount due under this Line
of Credit Agreement or any secured term note issued pursuant to this Line of
Credit Agreement.

     (b) The termination of the Loan Agreement (other than pursuant to Section
15(a) thereof) or the occurrence of an Event of Default as described in the Loan
Agreement (other than pursuant to Section 15(a) thereof).

     (c) The occurrence of one or more of the events of default in any secured
term note referred to in Paragraph 4 above.

     (d) The occurrence of any such Event of Default shall also constitute,
without notice or demand, a default under all other agreements between Bank and
Borrower and instruments and papers given Bank by Borrower, whether such
agreements, instruments, or papers now exist or hereafter arise.

     8. Borrower agrees that notwithstanding anything contained herein, the Loan
Agreement or otherwise, if the Borrower shall terminate the Loan Agreement or
any successor agreement, Bank shall have the right to terminate this line of
credit and demand the immediate payment of the balance due under this Line of
Credit Agreement.

     9. The execution, delivery and performance of this Line of Credit
Agreement, any note or any other instrument or document at any time required in
respect hereof or of the Loan are within the corporate powers of Borrower, and
not in contravention of law, the Articles of Organization or By-Laws of Borrower
or any amendment thereof, or of any indenture, agreement or undertaking to which
Borrower is a party or may otherwise be bound, and each such instrument and
document represents a valid and binding obligation of Borrower and is fully
enforceable according to its terms. Borrower will, if requested by Bank, furnish
Bank with the opinion of counsel for Borrower with respect to any or all of the
foregoing or other matters, such opinion to be in substance and form
satisfactory to Bank.

     10. This Line of Credit Agreement is supplementary to each and every other
agreement between Borrower and Bank and shall not be so construed as to limit or
otherwise derogate from any of the rights or remedies of Bank or any of the
liabilities, obligations or undertakings of Borrower under any such agreement,
nor shall any contemporaneous or subsequent agreement between Borrower and Bank
be construed to limit or otherwise derogate from any of the rights or remedies
of Bank or any of the liabilities, obligations or undertakings of Borrower
hereunder unless such other agreement specifically refers to this Line of Credit
Agreement and expressly so provides.

     11. This Line of Credit Agreement and the covenants and agreements herein
contained shall continue in full force and effect and shall be applicable not
only in respect of the Loan, but also to all other obligations, liabilities and
undertakings of Borrower to Bank whether direct or indirect, absolute or
contingent, due or to become due, now existing or hereafter arising or acquired,
until all

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such obligations, liabilities and undertakings have been paid or otherwise
satisfied in full. No delay or omission on the part of Bank in exercising any
right hereunder shall operate as a waiver of such right or any other right and
waiver on any one or more occasions shall not be construed as a bar to or waiver
of any right or remedy of Bank on any future occasion. This Line of Credit
Agreement isintended to take effect as a sealed instrument, shall be governed by
and construed according to the laws of the Commonwealth of Massachusetts, shall
be binding upon Borrower's successors and assigns and shall inure to the benefit
of Bank's successors and assigns.

     12. THE BORROWER AND BANK EACH HEREBY KNOWINGLY, VOLUNTARILY AND
INTENTIONALLY WAIVES ANY RIGHT THEY MAY HAVE OR HEREAFTER HAVE TO A TRIAL BY
JURY IN RESPECT OF ANY SUIT, ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO
THIS LINE OF CREDIT AGREEMENT. The Borrower hereby certifies that neither Bank
nor any of its representatives, agents or counsel has represented, expressly or
otherwise, that Bank would not, in the event of any such suit, action or
proceeding, seek to enforce this waiver of right to trial by jury. The Borrower
acknowledges that it has read the provisions of this Line of Credit Agreement
and in particular, this Section; has consulted legal counsel; understands the
right it is granting in this Line of Credit Agreement and is waiving in this
section in particular; and makes the above waiver knowingly, voluntarily and
intentionally.

     13. The Borrower and Bank agree that any action or proceeding to enforce or
arising out of this Line of Credit Agreement may be commenced in any court of
the Commonwealth of Massachusetts sitting in the counties of Suffolk or
Middlesex, or in the District Court of the United States for the District of
Massachusetts, and the Borrower waives personal service of process and agrees
that a summons and complaint commencing an action or proceeding in any such
court shall be properly served and confer personal jurisdiction if served by
next day Federal Express or comparable overnight delivery service providing
proof of delivery to the Borrower, or as otherwise provided by the laws of the
Commonwealth of Massachusetts or the United States of America.

     14. Borrower's obligations pursuant to this Line of Credit Agreement are
secured pursuant to the Loan Agreement.

                            Very truly yours,

                            EASTERN BANK

                            By: /s/ Alan Roberts
                               ----------------------------------
                                Alan Roberts, Vice President

ACCEPTED:

INTERNATIONAL ELECTRONICS, INC.

By:  /s/ John Waldstein
   ------------------------------------------
      John Waldstein, President and Treasurer

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                                    EXHIBIT A

                      EQUIPMENT DOCUMENTATION CERTIFICATION

     The undersigned, the __________________ of International Electronics, Inc.
(the "Borrower"), hereby certifies to Eastern Bank that:

       1. The attached copy of the Equipment Documentation (as defined in
          Paragraph 2 of the Borrower's Line of Credit Agreement for the
          Acquisition of Equipment dated December 11, 2001) is a true, correct
          and complete copy of the Equipment Documentation;

       2. The net purchase price (exclusive of soft cost, transportation
          and installation charges) of the new equipment referred to in the
          attached Equipment Documentation is in the amount of
          $________________;

       3. The net purchase price (exclusive of soft cost, transportation and
          installation charges) of the used equipment referred to in the
          attached Equipment Documentation is in the amount of
          $________________;

       4. The soft cost, transportation and installation charges of the
          equipment referred to in the attached Equipment Documentation is in
          the amount of $______________;

       5. The total purchase price of the equipment referred to in the
          attached Equipment Documentation (the net purchase price, plus the
          soft cost, transportation and installation charges) is in the amount
          of $________________;

       6. The aggregate principal amount of the Loan requested in connection
          with the attached Equipment Documentation does not exceed the lesser
          of (i) the Credit Limit, less any previous Loan, or (ii) the sum of
          (a) one hundred (100%) percent of the net purchase price of the new
          equipment set forth in Item 2 above, and (b) seventy (70%) percent of
          the net purchase price of the used equipment set forth in Item 3
          above (except as may be permitted under Paragraph 3 of the Borrower's
          Line of Credit Agreement for the Acquisition of Equipment dated
          December 11, 2001).

                                    -----------------------------------------
                                    Name:
                                    Title:

Date:  ______________, _____

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