STRUCTURAL INSTRUMENTATION INC
8-K, 1997-08-06
MISC INDUSTRIAL & COMMERCIAL MACHINERY & EQUIPMENT
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<PAGE>

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------


                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549
                          ---------------------------


                                   FORM 8-K

                                CURRENT REPORT
                    PURSUANT TO SECTION 13 OR 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934


        Date of Report (date of earliest event reported):  July 22, 1997



                              SI TECHNOLOGIES, INC.
             (Exact Name of Registrant as Specified in its Charter)



       DELAWARE                         0-12370                 95-3381440
(State or Other Jurisdiction of  (Commission File Number) (IRS Employer ID. No.)
 Incorporation or Organization)



                 4611 South 134th Place
                 Seattle, Washington                          98168
                 (Address of Principal Executive Offices)    (Zip Code)

                                 (206) 244-6100
              (Registrant's Telephone number, including area code)



- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

<PAGE>


ITEM 2.  ACQUISITION OR DISPOSITION OF ASSETS.

     (a)  On July 22, 1997 SI Technologies, Inc. (the "Company") acquired all of
          the outstanding capital stock of Aero-Go, a Tukwila, Washington-based
          company engaged in the manufacture, development and sale of air and
          water bearing "load handling" systems.

          The stock was acquired for cash consideration of $6,000,000 pursuant
          to a merger, from 29 Aero-Go shareholders.  The value of consideration
          given in exchange for the stock was determined by reference to
          Aero-Go's past operating history and the Company's analysis of its
          future earnings potential.  The Company borrowed the funds for the
          acquisition from US Bank of Washington, N.A.  The borrowed funds are
          secured by the assets of the Company and Aero-Go, as well as the stock
          of Aero-Go.

     (b)  Aero-Go is an operating company.  The Company currently intends to
          continue to operate Aero-Go as a separate subsidiary.

ITEM 7.  FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS.

     (a)  Financial Statements.

     (b)  Pro Forma Financial Information.

          (i)    Unaudited Pro Forma combined condensed financial statements of
                 the Company and Aero-Go, Inc. for the year ended July 31, 1996
                 and the nine months ended April 30, 1997.

     (c)  Exhibits.

          (i)    Acquisition Agreement among SI Technologies, Inc., SI
                 Acquisition Corporation, Aero-Go, Inc. and Kurtis V. Kosty,
                 Peter J. Burger, Stanley B. McDonald, Robert J. Behnke, and T.
                 Evans Wykoff dated July 21, 1997.

          (ii)   Closing and Indemnification Escrow Agreement dated as of July
                 21, 1997, by and among SI Technologies, Inc., Aero-Go, Inc.,
                 Kurt Kosty and Stanley B. McDonald, as representatives of the
                 shareholders and First Trust National Association, as escrow
                 agent.


                                      2

<PAGE>

                                  SIGNATURE

     Pursuant to the requirements of the Securities Exchange Act of 1934, the 
registrant has duly caused this report to be signed on its behalf by the 
undersigned, hereunto duly authorized.

Dated:  August 6, 1997

                                    SI TECHNOLOGIES, INC.



                                By    /s/ Rick A. Beets
                                    --------------------------------------
                                    Rick A. Beets, President


                                      3


<PAGE>


[letterhead]



INDEPENDENT AUDITORS' REPORT



Board of Directors
Aero-Go, Inc.
Seattle, Washington

We have audited the accompanying consolidated balance sheets of Aero-Go, Inc. 
and subsidiaries (the Company) as of April 30, 1997 and 1996, and the related 
consolidated statements of earnings, stockholders' equity, and of cash flows 
for the years then ended. These financial statements are the responsibility 
of the Company's management. Our responsibility is to express an opinion on 
these financial statements based on our audits. We did not audit the 
consolidated financial statements of Aero-Go Europe N.V. (a consolidated 
subsidiary), which statements reflect total assest and sales constituting 
approximately 24% and 25% in 1997, and approximately 40% and 38% in 1996, 
respectively, of the related consolidated totals. Those statements were 
audited by other auditors whose report has been furnished to us, and our 
opinion, insofar as it relates to the amounts included for Aero-Go Europe 
N.V., is based solely on the report of such other auditors.

We conducted our audits in accordance with generally accepted auditing 
standards. Those standards require that we plan and perform the audit to 
obtain reasonable assurance about whether the financial statements are free 
of material misstatement. An audit includes examining, on a test basis, 
evidence supporting the amounts and disclosures in the financial statements. 
An audit also includes assessing the accounting principles used and 
significant estimates made by management, as well as evaluating the overall 
financial statement presentation. We believe that our audits provide a 
reasonable basis for our opinion.

In our opinion, based on our audits and the report of the other auditors, 
such consolidated financial statements represent fairly, in all material 
respects, the financial position of Aero-Go, Inc. and subsidiaries as of April 
30, 1997 and 1996 and the results of their operations and their cash flows for 
the years then ended in conformity with generally accepted accounting 
principles.

/s/ Deloitte & Touche LLP

June 3, 1997


<PAGE>

AERO-GO, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS
APRIL 30, 1997 AND 1996
- -------------------------------------------------------------------------------

<TABLE>
<CAPTION>

ASSETS                                                       1997                1996
- ------                                                       ----                ----
<S>                                                        <C>                <C>
CURRENT ASSETS:
  Cash and cash equivalents                                $1,355,331         $  319,298
  Accounts receivable, including unbilled receivables
     of $277,000 and $84,000                                2,287,556          1,888,808
  Inventories                                               1,267,115          1,364,780
  Prepaid expenses                                             79,654             91,430
                                                           ----------         ----------
     Total current assets                                   4,989,656          3,664,316


LEASEHOLD IMPROVEMENTS AND EQUIPMENT,
    at cost:
  Leasehold improvements                                      189,300            200,483
  Machinery and equipment                                     885,380          1,008,703
  Furniture and fixtures                                      469,071            451,344
                                                           ----------         ----------

                                                            1,543,751          1,660,530
  Less accumulated depreciation and amortization            1,206,147          1,153,272
                                                           ----------         ----------
      Total leasehold improvements and equipment              337,604            507,258

OTHER ASSETS:
  Goodwill                                                     69,649             93,491
  Organization costs                                            5,876             20,021
                                                           ----------         ----------
      Total other assets                                       75,525            113,512
                                                           ----------         ----------

TOTAL                                                      $5,402,785         $4,285,086
                                                           ----------         ----------
                                                           ----------         ----------
</TABLE>


<PAGE>


<TABLE>
<CAPTION>

LIABILITIES AND STOCKHOLDERS' EQUITY                         1997                1996
- ------                                                       ----                ----
<S>                                                        <C>                <C>
CURRENT LIABILITIES:
  Accounts payable                                         $1,308,795         $  887,223
  Advances in excess of related costs                          77,485             57,204
  Salaries and commisions payable                             521,880            383,530
  Income taxes                                                  6,225             85,240
  Current portion of long-term debt                           125,287            239,672
                                                           ----------         ----------

      Total current liabilities                             2,039,672          1,652,869

LONG-TERM DEBT, less current portion                          268,825            398,913

COMMITMENTS (note 6)

STOCKHOLDERS' EQUITY:
  Common stock, par value $.25 per share--
    Authorized 8,000,000 shares; issued and
    outstanding, 1,567,500 shares                             552,750            552,750
  Retained earnings                                         2,597,531          1,623,643
  Cumulative translation adjustment                           (55,993)            56,911
                                                           ----------         ----------
      Total stockholders' equity                            3,094,288          2,233,304


                                                           ----------         ----------
TOTAL                                                      $5,402,785         $4,285,086
                                                           ----------         ----------
                                                           ----------         ----------
</TABLE>


<PAGE>

AERO-GO, INC. AND SUBSIDIARIES


CONSOLIDATED STATEMENTS OF EARNINGS
YEARS ENDED APRIL 30, 1997 AND 1996
- -------------------------------------------------------------------------------


<TABLE>
<CAPTION>

                                                             1997                1996
                                                             ----                ----
<S>                                                        <C>                <C>
SALES                                                      $12,421,209        $10,571,851

OTHER INCOME, net                                               50,035              9,856
                                                           -----------        -----------

                                                            12,471,244         10,581,707

COSTS AND EXPENSES                                          11,317,356         10,156,565
                                                           -----------        -----------

      Earnings from operations before
        income tax expense                                   1,153,888            425,142

INCOME TAX EXPENSE                                             180,000            230,000
                                                           -----------        -----------
NET EARNINGS                                               $   973,888        $   195,142
                                                           -----------        -----------
                                                           -----------        -----------
</TABLE>


<PAGE>


AERO-GO, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY
YEARS ENDED APRIL 30, 1997 AND 1996
- -------------------------------------------------------------------------------



<TABLE>
<CAPTION>


                                         Number                               Cumulative        Total
                                           of        Common     Retained     translation   stockholders'
                                         shares       stock     earnings      adjustment       equity
                                         ------      ------     --------     -----------   -------------
<S>                                     <C>         <C>         <C>           <C>           <C>

BALANCE, May 1, 1995                    2,149,194   $ 746,634   $1,667,501    $ 119,196     $2,533,331

  Net earnings                                                     195,142                     195,142

  Stock options exercised                  58,306      62,116                                   62,116

  Acquistion and retirement of stock     (640,000)   (256,000)    (239,000)                   (495,000)

  Translation adjustment                                                        (62,285)       (62,285)
                                        ---------   ---------   ----------   ----------     ----------
BALANCE, April 30, 1996                 1,567,500     552,750    1,623,643       56,911      2,233,304

  Net earnings                                                     973,888                     973,888

  Translation adjustment                                                       (112,904)      (112,904)
                                        ---------   ---------   ----------   ----------     ----------
BALANCE, April 30, 1997                 1,567,500   $ 552,750   $2,597,531   $  (55,993)    $3,094,288
                                        ---------   ---------   ----------   ----------     ----------
                                        ---------   ---------   ----------   ----------     ----------

</TABLE>


<PAGE>



AERO-GO, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS
YEARS ENDED APRIL 30, 1997 AND 1996
- -------------------------------------------------------------------------------


<TABLE>
<CAPTION>

                                                                       1997          1996
                                                                       ----          ----
<S>                                                                 <C>             <C>
OPERATING ACTIVITIES:
  Net earnings                                                      $  973,888      $ 195,142
  Adjustments to reconcile net earnings to net
      cash provided by operating activities:
    Depreciation and amortization                                      283,654        292,100
    Cash provided (used) by change in assets and liabilities:
      Accounts receivable                                             (498,682)       149,453
      Inventories                                                       40,892       (379,625)
      Accounts payable                                                 478,319       (197,870)
      Salaries and commissions payable                                 154,203       (106,024)
      Income taxes                                                     (79,015)        56,182
    Prepaid expenses                                                     7,158        (11,777)
    Advances in excess of related costs                                 30,116         38,630
                                                                    ----------      ---------
  Net cash provided by operating activities                          1,390,533         36,211

INVESTING ACTIVITIES:
  Additions to leasehold improvements and equipment                   (111,135)      (104,790)

FINANCING ACTIVITIES:
  Payments on long-term debt                                          (248,554)      (192,272)
  Common stock issued                                                                  62,116
  Retirement of common stock                                                          (72,000)
                                                                    ----------      ---------
  Net cash used by financing activities                               (248,554)      (202,156)
  Effect of exchange rate changes on cash                                5,189         16,060
                                                                    ----------      ---------
INCREASE (DECREASE) IN CASH AND CASH
  EQUIVALENTS                                                        1,036,033       (254,675)

CASH AND CASH EQUIVALENTS:
  Beginning of year                                                    319,298        573,973
                                                                    ----------      ---------
  End of year                                                       $1,355,331      $ 319,298
                                                                    ----------      ---------
                                                                    ----------      ---------
SUPPLEMENTAL DISCLOSURES OF CASH FLOW
    INFORMATION
  Cash paid during the year for income taxes                        $  259,015      $ 173,819
  Cash paid during the year for interest                                42,766         38,861

SUPPLEMENTAL DISCLOSURE OF NONCASH FINANCING
   ACTIVITIES:
  Note payable to former stockholder to acquire and retire stock                      423,000


</TABLE>



<PAGE>



AERO-GO, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
YEARS ENDED APRIL 30, 1997 AND 1996
- -------------------------------------------------------------------------------


NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
    
     DESCRIPTION OF BUSINESS: Aero-Go, Inc. and subsidiaries (The Company) are 
     principally engaged in the design, development, manufacture, and sale of 
     material handling systems.
     
     PRINCIPLES OF CONSOLIDATION: The consolidated financial statements include 
     the accounts of the Company's wholly owned subsidiaries. All significant 
     intercompany transactions and accounts have been eliminated.
     
     FOREIGN CURRENCY TRANSLATION: Foreign currency assets and liabilities are 
     translated into their U.S. dollar equivalents based on year end exchange 
     rates. Revenue and expense accounts are generally translated at average 
     exchange rates for the appropriate fiscal year. Aggregate exchange gains 
     and losses arising from the translation of foreign assets and liabilities 
     are included in stockholders' equity when significant. Transaction gains 
     and losses are included in income and have not been significant in amount.
     
     INVENTORIES: The Company has stated inventories of materials used in 
     production of standard products at the lower of cost (first-in, first-out 
     method) or market.
     
     LEASEHOLD IMPROVEMENTS AND EQUIPMENT: Leasehold improvements are 
     amortized on the straight-line method over the term of the lease. 
     Equipment is depreciated on the straight-line method based upon estimated 
     useful lives of three to five years.
     
     GOODWILL: The cost in excess of the fair value of net assets acquired in 
     a business combination is being amortized to expense over ten years using 
     the straight-line method.
     
     REVENUE RECOGNITION: Sales are recorded at time of shipment for equipment 
     and for special orders with relatively short production time 
     requirements. On long-term contracts, sales are recorded based on the 
     percentage that incurred costs bear to the total estimated costs at 
     completion. Estimated losses are recorded in total when they become 
     evident.
     
     CASH AND CASH EQUIVALENTS: Cash in excess of daily requirements is 
     invested in interest-bearing instruments with maturities of three months 
     or less. Such investments are considered to be cash equivalents.
     
     USE OF ESTIMATES: The preparation of the financial statements in 
     conformity with generally accepted accounting principles requires 
     management to make estimates and assumptions that affect amounts reported 
     in the financial statements. Changes in these estimates and assumptions 
     are considered reasonably possible and may have a material impact on the 
     financial statements. The Company has used estimates in determining the 
     allowance for bad debts, sales for long-term contracts, tax liabilities 
     and other contingencies.




<PAGE>



NOTE 2: INVENTORIES

Inventories consist of the following at April 30:

                                                       1997            1996
                                                      ------          ------
       Finished goods                              $  509,199       $  467,457
       Work in process                                208,452          293,311
       Raw materials                                  549,464          604,012
                                                   ----------       ----------

                                                   $1,267,115       $1,364,780
                                                   ----------       ----------
                                                   ----------       ----------

NOTE 3: LINE OF CREDIT

The Company has an agreement with a bank to provide a revolving line of 
credit up to $500,000 which expires August 1, 1997. Borrowings under this 
agreement bear interest equal to the bank's prime interest rate plus .25% 
(8.75% at April 30,1997). The line of credit is secured by accounts 
receivable and inventory. There were no amounts outstanding under this 
agreement at April 30, 1997.

Under this same agreement, the Company has standby letters of credit totalling 
$213,250 outstanding as of April 30, 1997. These standby letters of credit 
expire through July 30, 1997.

The Company's foreign subsidiary, AeroGo Europe, has an agreement with a bank 
to provide a revolving line of credit up to Belgium Francs 10,000,000 
($279,800 based on exchange rates at April 30, 1997). Borrowings under this 
agreement bear interest equal to the bank's prime rate plus 1.25% (7% at 
April 30, 1997). The line of credit is secured by accounts receivable and 
inventory. At April 30, 1997, there was BEF3,327,339 ($93,099) outstanding 
under this agreement.

NOTE 4:  LONG-TERM DEBT

<TABLE>
<CAPTION>
                                                                                       1997          1996
                                                                                       ----          ----
  <S>                                                                                 <C>          <C>
  Noninterest bearing promissory note to a former stockholder
    with a $504,000 face value net of an $81,000 discount for
    imputed interest. Payable in annual installments (including principal
    and imputed interest) of $144,000 on May 1, 1997,1998 and
    1999. Interest expense of $35,300 and $12,300 was recorded
    in 1997 and 1996 based on an imputed interest rate of 10%                          $363,300     $423,000

  Note payable to the former owneres of M. Claessens N.V. in annual
    installments of $146,982 plus interest at 9%. Note secured
    by shares of stock of the Company. The note is denominated
    in Belgian Francs                                                                                 146,982

  Other                                                                                   30,812       68,603
                                                                                        --------     --------

                                                                                         394,112      638,585
  Less current portion, due within one year                                              125,287      239,672
                                                                                        --------     --------
                                                                                        $268,825     $398,913
                                                                                        --------     --------

</TABLE>


<PAGE>




Maturities of long-term debt are as follows:

     Year ending April 30,  
     ---------------------

             1998                               $125,286
             1999                                132,512
             2000                                136,314
                                                --------
                                                $394,112
                                                --------
                                                --------
NOTE 5:  FEDERAL INCOME TAXES

The provision for federal taxes on income is more than that which results 
from application of the statutory corporate tax rate due to the following:


                                                     1997            1996
                                                     ----            ----
     Continuing operations:
        Expected taxes at statutory rate           $392,000        $144,000
        Business meals                                3,000           3,000
        Asset write-off related to foreign
          subsidiary                               (322,000)
        Foreign sales corporation                    (70,000)        (42,000)
        Nonrecognition of benefit from net
          operating loss of foreign subsidiary      177,000         125,000
                                                  ----------      ----------

                                                   $180,000        $230,000
                                                  ----------      ----------
                                                  ----------      ----------

The provision for federal income taxes consisted of the following:


                                                     1997            1996
                                                     ----            ----
     Current income taxes                          $179,000        $217,000
     Change in deferred income taxes                  1,000          13,000
                                                  ----------      ----------

                                                   $180,000        $230,000
                                                  ----------      ----------
                                                  ----------      ----------


Deferred federal income tax is provided for differences in the reporting of 
income and expenses for financial statement and income tax purposes. 
Components of the Company's net liability (deferred income tax asset) at 
April 30, 1997 and 1996, were:

                                                     1997            1996
                                                     ----            ----
     Depreciation                                  $ 17,000        $ 16,000
     Allowance for bad debts                        (12,000)        (12,000)
                                                  ----------      ----------

                                                   $  5,000        $  4,000
                                                  ----------      ----------
                                                  ----------      ----------

At April 30, 1997 and 1996, the Company had net operating loss carryforwards 
for income tax purposes attributable to its foreign subsidiary of $1,181,000 
and $989,000, respectively. This net operating loss may be carried forward 
indefinitely.


<PAGE>


NOTE 6: COMMITMENTS

The Company leases its manufacturing and administrative facilities under a 
noncancellable operating lease which expires April 30, 1999. Annual rental 
expense under this lease for the years ended April 30, 1997 and 1996, was 
$215,000 and $235,000, respectively.

Minimum annual rental expense for the remaining term of the lease is $215,000.

The Company leases its facilities in Belgium under a noncancellable operating 
lease which expires October 31, 1998. Annual rental expense under this lease 
for the years ended April 30, 1997 and 1996, was $76,000 and $81,000, 
respectively.

Minimum annual rental expense for the remaining term of the lease is $78,000.

NOTE 7: GENERAL AND ADMINISTRATIVE EXPENSE

General and administrative expense charged directly to earnings for the years 
ended April 30, 1997 and 1996, was $1,103,400 and $986,392, respectively.

NOTE 8: STOCKHOLDERS' EQUITY

The Company has an incentive stock option plan which reserves 500,000 shares
of common stock for issuance to officers and key employees. Under the plan,
options to purchase 342,500 shares have been granted ($.82 -- $1.12 per share)
and are currently outstanding. The options become exercisable ratably over a
four-year period beginning one year after date of grant. According to the
terms of the stock option plan, all shares that have been granted become
exercisable immediately upon change in control of the Company. The options
expire five years after date of grant. A summary of options granted and
exercised under this plan is as follows:

                                         Number         Weighted average
                                        of option       exercise price of
                                         shares           option shares
                                         ------           -------------

     Outstanding, May 1, 1995           310,000              $ .96
       Granted                          100,000               1.12
       Exercised                        (58,306)              1.06
       Forfeited                         (9,194)              1.08
                                        -------

     Outstanding, April 30, 1996        342,500                .98
       Granted                 
       Exercised                        -------

     Outstanding, April 30, 1997        342,500                .98
                                        -------  
                                        -------  



<PAGE>

Financial data pertaining to outstanding stock options at April 30, 1997, 
were as follows:

                                                                   Weighted
                     Weighted         Weighted                      average
                     average     average exercise   Number of    exercise price
   Ranges of        remaining        price of      exercisable   of exercisable
exercise prices  contractual life  option shares  option shares  option shares 
- ---------------  ----------------  -------------  -------------  --------------
  $.82-$1.12           2.12             $.98         186,250           $.97

The Company applies Accounting Principles Board Opinion No. 25 and related 
interpretations in accounting for the Plan. No compensation cost has been 
recognized for the incentive stock option plan for the years ended April 30, 
1997 and 1996. The Company estimates the fair value of its stock options 
using the Black-Scholes option-pricing model. Had compensation cost for the 
Company been determined based on the fair value at the grant dates consistent 
with the FASB's Statement of Accounting Standards No. 123, ACCOUNTING FOR 
STOCK-BASED COMPENSATION, the impact on net income would not have been 
significant for the years ended April 30, 1997 and 1996.

NOTE 9: SIGNIFICANT CUSTOMERS

During the fiscal years ended April 30, 1997 and 1996, approximately 13% and 
7% respectively, of the Company's revenues resulted from sales to one customer

NOTE 10: RETIREMENT PLAN

The Company has a defined contribution retirement plan covering employees who 
have met certain minimum requirements as to age and length of service and who 
elect to participate in the plan. For the years ended April 30, 1997 and 
1996, annual contributions equal to a maximum of 3% of each participant's 
compensation were made by the Company. Retirement plan expenses were 
approximately $110,000 and $65,000 for the years ended April 30, 1997 and 
1996, respectively.


<PAGE>

                              SI TECHNOLOGIES, INC.

                PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS
                                   (UNAUDITED)


The accompanying unaudited pro forma combined condensed financial statements 
have been derived from the historical results of operations of SI 
Technologies, Inc. ("SI") and AeroGo, Inc. ("AeroGo") for the year ended July 
31, 1996 and the nine months ended April 30, 1997 and financial position as 
of April 30, 1997. The operations of AeroGo Europe, which were sold 
immediately prior to the acquisition, are considered diposed of for the 
purpose of this presentation.

The unaudited pro forma combined condensed financial statements are presented 
for informational purposes only and do not purport to be indicative of the 
operating results that actually would have occurred if the acquisition had 
been consummated on August 1, 1995, nor which may result from future 
operations.  The pro forma adjustments are based on available information and 
certain assumptions that the Company believes are reasonable.  The 
acquisition has been accounted for using the purchase method of accounting.  
These pro forma financial statements should be read in conjunction with the 
historical financial statements and related notes of the Company and the 
acquisition document.


<PAGE>

                              SI TECHNOLOGIES, INC.
                   PRO FORMA COMBINED CONDENSED BALANCE SHEET
                                   (UNAUDITED)

<TABLE>
<CAPTION>

                                                                HISTORICAL
                                                              APRIL 30, 1997

ASSETS
                                                                                                                    PRO FORMA
                                                            SI                AEROGO           ADJUSTMENTS           COMBINED
                                                      ---------------------------------       ---------------------------------
<S>                                                   <C>                 <C>                 <C>                 <C>
Current assets:
Cash and cash equivalents                             $    107,281        $  1,323,966        $          -        $  1,431,247
   Trade accounts receivable, less allowance
      for doubtful accounts of $106,166
      and $35,000 respectively                           1,973,699           1,532,138                   -           3,505,837
   Inventories                                           2,007,590             928,181                   -           2,935,771
   Deferred tax asset                                      289,000                   -                   -             289,000
   Other current assets                                    314,007              45,742                   -             359,749
                                                      ---------------------------------       ---------------------------------
      Total current assets                               4,691,577           3,830,027                   -           8,521,604

Property and equipment, less accumulated
   depreciation and amortization                           829,814             183,744              50,000 (1)       1,063,558

Other assets:
   Intangible assets, net                                3,187,605                   -           3,738,620 (2)       6,926,225
   Other                                                   428,944                   -                   -             428,944
                                                      ---------------------------------       ---------------------------------
TOTAL ASSETS                                          $  9,137,940        $  4,013,771        $  3,788,620        $ 16,940,331
                                                      ---------------------------------       ---------------------------------
                                                      ---------------------------------       ---------------------------------

LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
   Notes payable to bank                              $          -        $          -        $          -        $          -
   Current maturities of long term debt                    100,000             108,700           3,271,428 (3)       3,480,128
   Put option obligation - current                         385,000                   -                   -             385,000
   Trade accounts payable                                1,046,235             770,214             250,000 (4)       2,066,449
   Income taxes payable                                                          6,225                   -               6,225
   Accrued liabilities                                     545,682             412,652                   -             958,334
                                                      ---------------------------------       ---------------------------------
      Total current liabilities                          2,076,917           1,297,791           3,521,428           6,896,136

Long-term debt, less current maturities                  1,788,090             254,600           2,728,572 (3)       4,771,262
Deferred taxes                                              83,000                   -                   -              83,000

Stockholders' equity:                                    5,189,933           2,461,380          (2,461,380)(5)       5,189,933
                                                      ---------------------------------       ---------------------------------
TOTAL LIABILITIES AND STOCKHOLDERS'
      EQUITY                                          $  9,137,940        $  4,013,771        $  3,788,620        $ 16,940,331
                                                      ---------------------------------       ---------------------------------
                                                      ---------------------------------       ---------------------------------

</TABLE>

            See notes to pro forma combined condensed balance sheet.

<PAGE>

                              SI TECHNOLOGIES, INC.

               NOTES TO PRO FORMA COMBINED CONDENSED BALANCE SHEET
                                   (UNAUDITED)


(1)  Revaluation to fair value of acquired property and equipment.

(2)  Increase to intangible assets (goodwill).  The goodwill associated with the
     AeroGo acquisition will be amortized over a period of 25 years.

(3)  Increase to long term debt associated with the acquisition financing of
     AeroGo.

(4)  Adjustments to record accrued expenses associated with the acquisition.

(5)  Elimination of AeroGo stockholders' equity.


<PAGE>

                              SI TECHNOLOGIES, INC.
               PRO FORMA COMBINED CONDENSED STATEMENTS OF EARNINGS
                                   (UNAUDITED)

<TABLE>
<CAPTION>

                                                                HISTORICAL
                                                         FOR THE NINE MONTHS ENDED
                                                              APRIL 30, 1997

                                                                                                                    PRO FORMA
                                                            SI                AEROGO           ADJUSTMENTS           COMBINED
                                                      ---------------------------------       ---------------------------------
<S>                                                   <C>                 <C>                 <C>                 <C>
Net sales                                             $  8,256,987        $  6,702,155        $          -        $ 14,959,142
Cost of sales                                            4,621,468           3,348,654               5,250 (1)       7,975,372
                                                      ---------------------------------       ---------------------------------
      Gross profit                                       3,635,519           3,353,501              (5,250)          6,983,770

Operating expenses:
   Selling, service, general and administrative          2,518,813           1,860,470               2,250 (1)       4,381,533
   Research, development and engineering                   529,484             358,400                   -             887,884
   Amortization of intangibles                              83,173                   -             113,000 (2)         196,173
                                                      ---------------------------------       ---------------------------------
      Total operating expenses                           3,131,470           2,218,870             115,250           5,465,590
                                                      ---------------------------------       ---------------------------------

      Earnings from operations                             504,049           1,134,631            (120,500)          1,518,180

Interest expense                                          (154,926)            (29,171)           (628,000)(3)        (812,097)
Other income (expense), net                                   (725)             21,212                   -              20,487
                                                      ---------------------------------       ---------------------------------

      Net earnings before income taxes                     348,398           1,126,672            (748,500)            726,570

Income tax (expense) benefit                              (128,907)           (338,000)            216,000 (4)        (250,907)

                                                      ---------------------------------       ---------------------------------
      Net earnings (loss)                             $    219,491        $    788,672        $   (532,500)       $    475,663
                                                      ---------------------------------       ---------------------------------
                                                      ---------------------------------       ---------------------------------


Net earnings per common and 
      common equivalent share                         $        .09                                                $        .19
                                                      -------------                                               -------------
                                                      -------------                                               -------------

Weighted average common and common
equivalent shares outstanding                            2,440,501                                                   2,440,501

</TABLE>

        See notes to pro forma combined condensed statements of earnings.


<PAGE>

                              SI TECHNOLOGIES, INC.
               PRO FORMA COMBINED CONDENSED STATEMENTS OF EARNINGS
                                   (UNAUDITED)

<TABLE>
<CAPTION>

                                                                HISTORICAL
                                                        FOR THE TWELVE MONTHS ENDED
                                                               JULY 31, 1996

                                                                                                                    PRO FORMA
                                                            SI                AEROGO           ADJUSTMENTS           COMBINED
                                                      ---------------------------------       ---------------------------------
<S>                                                   <C>                 <C>                 <C>                 <C>
Net sales                                             $ 11,087,537        $  8,490,484        $          -        $ 19,578,021
Cost of sales                                            5,771,310           4,208,877               7,000 (1)       9,987,187
                                                      ---------------------------------       ---------------------------------
      Gross profit                                       5,316,227           4,281,607              (7,000)          9,590,834

Operating expenses:
   Selling, service, general and administrative          3,329,126           2,526,538               3,000 (1)       5,858,664
   Research, development and engineering                   904,655             418,437                   -           1,323,092
   Amortization of intangibles                              96,774                   -             150,000 (2)         246,774
                                                      ---------------------------------       ---------------------------------
      Total operating expenses                           4,330,555           2,944,975             153,000           7,428,530
                                                      ---------------------------------       ---------------------------------

      Earnings from operations                             985,672           1,336,632            (160,000)          2,162,304

Interest expense                                          (112,355)            (24,592)           (873,000)(3)      (1,009,947) 
Other income (expense), net                                 57,288               1,081                   -              58,369
                                                      ---------------------------------       ---------------------------------

      Net earnings before income taxes                     930,605           1,313,121          (1,033,000)          1,210,726

Income tax (expense) benefit                              (349,416)           (390,000)            300,000 (4)        (439,416)

                                                      ---------------------------------       ---------------------------------
      Net earnings (loss)                             $    581,189        $    923,121        $   (733,000)       $    771,310
                                                      ---------------------------------       ---------------------------------
                                                      ---------------------------------       ---------------------------------


Net earnings per common and 
      common equivalent share                         $        .24                                                $        .32
                                                      -------------                                               -------------
                                                      -------------                                               -------------

Weighted average common and common
equivalent shares outstanding                            2,426,088                                                   2,426,501

</TABLE>

        See notes to pro forma combined condensed statements of earnings.

<PAGE>

                              SI TECHNOLOGIES, INC.

          NOTES TO PRO FORMA COMBINED CONDENSED STATEMENTS OF EARNINGS
                                   (UNAUDITED)


(1)  Adjustment to increase depreciation expense resulting from the revaluation
     of acquired property and equipment.  The acquired assets will be
     depreciated over service lives from two years to seven years.

(2)  Amortization of amounts assigned to intangible assets acquired in the
     acquisition of AeroGo.  The full adjustment amount to intangible assets is
     assigned to goodwill and will be amortized over a period of 25 years. 

(3)  Adjustment to reflect the increased interest expense associated with the
     debt financing of the AeroGo acquisition. The acquisition financing 
     includes a one year term loan that is assumed to be renewed 
     substantially under its current terms.

(4)  Tax effects of pro forma adjustments.





<PAGE>







                                ACQUISITION AGREEMENT

                                        AMONG

                                SI TECHNOLOGIES, INC.,
                              SI ACQUISITION CORPORATION

                                     AEROGO, INC.
                                         AND
                          KURTIS V. KOSTY, PETER J. BURGER,
                        STANLEY B. MCDONALD, ROBERT J. BEHNKE
                                 AND T. EVANS WYCKOFF

                                    July 21, 1997











<PAGE>

                                  TABLE OF CONTENTS

ARTICLE 1     THE MERGER . . . . . . . . . . . . . . . . . . . . . . . . .  1

    1.1       Effective Time of the Merger.. . . . . . . . . . . . . . . .  1
    1.2       Effects of the Merger. . . . . . . . . . . . . . . . . . . .  2
    1.3       Board of Directors.. . . . . . . . . . . . . . . . . . . . .  2
    1.4       Officers.  . . . . . . . . . . . . . . . . . . . . . . . . .  2

ARTICLE 2     EFFECT OF THE MERGER ON THE CAPITAL STOCK OF THE
              CONSTITUENT CORPORATIONS; EXCHANGE OF CERTIFICATES . . . . .  2

    2.1       Effect on Capital Stock. . . . . . . . . . . . . . . . . . .  2

ARTICLE 3     REPRESENTATIONS AND WARRANTIES . . . . . . . . . . . . . . .  4

    3.1       Representations and Warranties of the Company .. . . . . . .  4
    3.2       Representations and Warranties of Acquiror and Acqcorp. . . . 15
    3.3       Representations and Warranties of the Shareholders. . . . . . 16

ARTICLE 4     COVENANTS. . . . . . . . . . . . . .. . . . . . . . . . . . . 17

    4.1       Covenants of the Company Relating to Conduct of Business. . . 17
    4.2       Access to Information . . . . . . . . . . . . . . . . . . . . 19
    4.3       Expenses. . . . . . . . . . . . . . . . . . . . . . . . . . . 20
    4.4       Additional Agreements . . . . . . . . . . . . . . . . . . . . 20
    4.5       No Solicitation . . . . . . . . . . . . . . . . . . . . . . . 20
    4.6       Current Information--the Company  . . . . . . . . . . . . . . 21
    4.7       Disposition of European Subsidiary. . . . . . . . . . . . . . 21
    4.8       Failure to Fulfill Conditions . . . . . . . . . . . . . . . . 21

ARTICLE 5     CONDITIONS PRECEDENT TO CLOSING. . . . . . . . . . . . . . . 22

    5.1       Conditions to Each Party's Obligations to Effect the Merger .22
    5.2       Conditions of Obligations of Acquiror and Acqcorp . . . . . .22
    5.3       Conditions of Obligations of the Company. . . . . . . . . . .24

ARTICLE 6     TERMINATION, AMENDMENT AND WAIVER. . . . . . . . . . . . . . 25

    6.1       Termination . . . . . . .. . . . . . . . . . . . . . . . . . 25
    6.2       Effect of Termination . .. . . . . . . . . . . . . . . . . . 25
    6.3       Amendment . . . . . . . .. . . . . . . . . . . . . . . . . . 26
    6.4       Extension; Waiver . . . .. . . . . . . . . . . . . . . . . . 26

                                       i

<PAGE>

ARTICLE 7     GENERAL PROVISIONS . . . . . . . . . . . . . . . . . . . . . 26

    7.1       Limited Survival of Representations, Warranties
              and Agreements. . . .. . . . . . . . . . . . . . . . . . . . 26
    7.2       Indemnification Escrow. .. . . . . . . . . . . . . . . . . . 26
    7.3       Indemnification by the Company. . . . . . . . . .  . . . . . 27
    7.4       Indemnification by Shareholders . . . . . . . . .  . . . . . 27
    7.5       Indemnification by Acquiror or Acqcorp. . . . . .  . . . . . 27
    7.6.      Insurance . . . . . . . . . . . . . . . . . . . .. . . . . . 28
    7.7       Attorneys' Fees . . . . . . . . . . . . . . . . .. . . . . . 29
    7.8       Notices . . . . . . . . . . . . . . . . . . . . .. . . . . . 29
    7.9       Interpretation. . . . . . . . . . . . . . . . . .. . . . . . 30
    7.10      Counterparts. . . . . . . . . . . . . . . . . .  . . . . . . 30
    7.11      Entire Agreement; No Third-Party Beneficiaries.  . . . . . . 30
    7.12      Governing Law . . . . . . . . . . . . . . . . .  . . . . . . 31
    7.13      Publicity . . . . . . . . . . . . . . . . . . .  . . . . . . 31
    7.14      Assignment. . . . . . . . . . . . . . . . . . .  . . . . . . 31

                                       ii

<PAGE>


                                   LIST OF EXHIBITS

Exhibit                                                     Agreement Section
- -------                                                     -----------------

1.  Plan of Merger                                                        1.1

2.  Directors of Surviving Corporation                                    1.3

3.  Officers of Surviving Corporation                                     1.4

4.  Closing and Indemnification Escrow Agreement                          2.4

5.  Consulting and Non-Competition Agreement                            5.2(d)















                                      iii

<PAGE>

                                ACQUISITION AGREEMENT

    ACQUISITION AGREEMENT, dated as of July 21, 1997, among SI TECHNOLOGIES, 
INC., a Delaware Corporation ("Acquiror"), SI ACQUISITION CORPORATION, a 
Washington corporation and a wholly owned subsidiary of Acquiror ("Acqcorp"), 
AEROGO, INC., a Washington corporation (the "Company"), and KURTIS V. KOSTY, 
PETER J. BURGER, STANLEY B. MCDONALD, ROBERT J. BEHNKE and T. EVANS WYCKOFF 
("Shareholders").

                                       RECITALS

    A.   Acquiror is engaged in the electronic weighing device and on-board
computers industry throughout the world;

    B.   The Company is engaged in the engineering and manufacturing of air 
and water bearing systems and the Shareholders are directors of the Company 
and own or are affiliated with owners of an aggregate of 76.26% of the 
outstanding capital stock of the Company as of July 21, 1997;

    C.   Acquiror and Acqcorp desire to acquire from Shareholders and other 
shareholders of the Company, and Shareholders desire to sell, or cause to be 
sold, to Acquiror and Acqcorp, all of the capital stock of the Company.

    NOW, THEREFORE, in consideration of the premises and the representations, 
warranties and agreements herein contained, the parties agree as follows:

                                      ARTICLE 1

                                      THE MERGER

    1.1  EFFECTIVE TIME OF THE MERGER.  Subject to the provisions hereof,
articles of merger containing a Plan of Merger in substantially the form of
Exhibit 1 attached hereto, and any other required documents, in such form as
required by, and executed in accordance with, the relevant provisions of the
Washington Business Corporation Act (the "Washington Law") (together, the
"Merger Documents") shall be duly delivered to the Secretary of State of the
State of Washington for filing, as provided in the Washington Law, as soon as
practicable after satisfaction of the latest to occur of the conditions set
forth in Article 5.  The Merger shall become effective upon the filing of the
Merger Documents by the Secretary of State of the State of Washington.  The term
"Effective Time of the Merger" shall mean the date and time when the Merger
becomes effective.  A closing (the "Closing") shall take place on July 21, 1997
at the offices of Graham & James/Riddell Williams or at such other place, at

                                       1

<PAGE>

such other time, or on such other date as Acquiror, Acqcorp and the Company 
may mutually agree upon for the Closing to take place.  At the Closing there 
shall be delivered to Acquiror, Acqcorp and the Company the opinions, 
certificates and other documents and instruments required to be delivered 
under Article 5 hereof.

    1.2  EFFECTS OF THE MERGER.  At the Effective Time of the Merger, (i) the 
separate existence of Acqcorp shall cease and Acqcorp shall be merged with 
and into the Company (Acqcorp and the Company are sometimes referred to 
herein as the "Constituent Corporations" and the Company is sometimes 
referred to herein as the "Surviving Corporation"), pursuant to the Plan of 
Merger, and (ii) the Articles of Incorporation and the Bylaws of Acqcorp as 
in effect immediately prior to the Effective Time of the Merger shall be the 
Articles of Incorporation and the Bylaws of the Surviving Corporation until 
thereafter amended as provided by law.

    1.3  BOARD OF DIRECTORS.  Upon the effectiveness of the Merger, the 
members of the Board of Directors of the Surviving Corporation shall be as 
set forth in Exhibit 2.

    1.4  OFFICERS.  Upon the effectiveness of the Merger, the officers of the 
Surviving Corporation shall be set forth on Exhibit 3.

                                      ARTICLE 2

                   EFFECT OF THE MERGER ON THE CAPITAL STOCK OF THE
                  CONSTITUENT CORPORATIONS; EXCHANGE OF CERTIFICATES

    2.1  EFFECT ON CAPITAL STOCK.  As of the Effective Time of the Merger, by 
virtue of the Merger and without any further action on the part of the holder 
of any shares of common stock of the Company,

         (a)  CAPITAL STOCK OF ACQCORP.  Each issued and outstanding share of 
the capital stock of Acqcorp shall be converted into and become one fully 
paid and nonassessable share of common stock of the Surviving Corporation 
(the "Surviving Corporation Common Stock").  From and after the Effective 
Time of the Merger, each outstanding certificate theretofore representing 
shares of capital stock of Acqcorp shall be deemed for all purposes to 
evidence ownership of and to represent the number of shares of Surviving 
Corporation Common Stock into which such shares of capital stock of Acqcorp 
shall have been converted. Promptly after the Effective Time of the Merger, 
the Surviving Corporation shall issue, on a share for share basis, to the 
stockholder of Acqcorp a stock certificate or certificates representing 
shares of Surviving Corporation Common Stock in exchange for the certificate 
or certificates which formerly represented shares of capital stock of 
Acqcorp, which shall be  canceled.

                                       2

<PAGE>

         (b)  RIGHT OF HOLDERS OF SHARES TO RECEIVE CASH  All of the issued 
and outstanding  shares of common stock of the Company (the "Shares") as a 
class shall be converted into the right to receive the Merger Consideration 
as hereinafter provided and subject to the provisions of Section 7.3.

         (c)  NO FURTHER OWNERSHIP RIGHTS IN THE SHARES.  All consideration 
paid upon the surrender of the Shares in accordance with the terms hereof 
shall be deemed to have been paid in full satisfaction of all rights 
pertaining to such Shares, and after the Effective Time of the Merger there 
shall be no registration of transfers on the stock transfer books of the 
Surviving Corporation of the Shares which were outstanding immediately prior 
to the Effective Time of the Merger.  If, after the Effective Time of the 
Merger, Certificates are presented to the Surviving Corporation for any 
reason, they shall be canceled and exchanged as provided in this Article 2.

    2.2  EFFECT ON STOCK OPTIONS.  Each outstanding option to purchase common 
stock of the Company shall terminate as of the Effective Time of the Merger, 
provided however that the holder of an option may  exercise it and become a 
shareholder of the Company prior to the Closing.  Payment of the exercise 
price to the Company prior to the Closing shall not be necessary for the 
optionee to become a shareholder, but in such event, the unpaid exercise 
price shall be deducted from the portion of the Merger Consideration such 
shareholder would have received if  the exercise price  had been paid and 
shall be reallocated to the shareholders of record immediately prior to the 
Effective Time in proportion to their shareholdings on that date.
         
    2.3  PAYMENT SCHEDULE   Prior to the Closing, the Company shall prepare a 
list of the shareholders (the "Payment Schedule") showing the portions of the 
Merger Consideration to which each shareholder is entitled after taking 
Section 2.2. into account, the resulting percentage of the Merger 
Consideration (the "Percentage Share") to which each is entitled, and the 
amounts, if any, to be withheld for income and employment taxes with respect 
to each shareholder.

    2.4  PAYMENT OF MERGER CONSIDERATION   At Closing, the Acquiror shall pay 
the Merger Consideration to the Escrow Agent pursuant to the Closing and 
Indemnification Escrow Agreement between the Acquiror, the Company, Kurt 
Kosty and Stanley B. McDonald (collectively, the "Shareholder 
Representative") as representatives of the Company's shareholders, and First 
Trust, National Association (the "Escrow Agent") as Escrow Agent attached as 
Exhibit 2.4.  The Escrow Agent shall disburse the Merger Consideration in 
accordance with said Escrow Agreement, including  paying the amounts to be 
withheld, as indicated in the Payment Schedule, to the Company for remittance 
to the appropriate taxing authorities.  The portion of the Merger 
Consideration which is to be held back pursuant to Section 7.2 ("the Escrowed 
Funds") shall be held and disbursed by the Escrow Agent as Escrow Agent 
pursuant to the Escrow Agreement.

                                       3

<PAGE>

    2.5  DISTRIBUTION OF EXCESS CASH   Prior to Closing, the Company shall 
distribute its cash in excess of $1,000,000 (the "Excess Cash") to  its 
shareholders of record immediately prior to the Effective Time of the Merger 
in proportion to their respective shareholdings, as of that date.

                                      ARTICLE 3

                            REPRESENTATIONS AND WARRANTIES

    3.1  REPRESENTATIONS AND WARRANTIES OF THE COMPANY.  The Company 
represents and warrants to Acquiror and Acqcorp, except as otherwise 
disclosed on the Disclosure Schedule, as follows:

         (a)  ORGANIZATION, STANDING AND POWER.  The Company is a corporation 
duly organized, validly existing and in good standing under the laws of the 
State of Washington.  The Company has all requisite corporate power and 
authority to own, lease and operate its properties and assets and to carry on 
its business as now being conducted, and is duly licensed or qualified to do 
business in each jurisdiction in which the nature of its business or the 
ownership or leasing of its properties or assets makes such licensing or 
qualification necessary, except where failure to be so licensed or qualified 
would not have a material adverse effect on the Company.  Complete and 
correct copies of the Articles of Incorporation and Bylaws of the Company as 
amended to the date hereof are attached hereto as Exhibit 3.1A and 3.1B, 
respectively, to the Disclosure Statement.

         (b)  CAPITAL STRUCTURE.  The authorized capital stock of the Company 
consists of 8,000,000 shares of common stock, $.25 par value per share, of 
which on the date hereof 1,567,500 shares of common stock are issued and 
outstanding. All outstanding shares of the Company's capital stock are duly 
authorized, validly issued, fully paid and nonassessable and not subject to 
preemptive rights.  Except as set forth in the Disclosure Schedule, there are 
no options, warrants, calls, rights, commitments or agreements of any 
character to which the Company is a party or by which it is bound obligating 
the Company to issue, deliver or sell, or cause to be issued, delivered or 
sold, additional shares of capital stock of the Company or obligating the 
Company to grant, extend or enter into any such option, warrant, call, right, 
commitment or agreement.  All options, warrants, calls, rights, commitments 
or agreements listed in the Disclosure Schedule, at or prior to Closing, 
shall have been (i) exercised and converted into shares of the Company's 
common stock, or (ii)  canceled or otherwise terminated.  Except as listed in 
the Disclosure Schedule, there are no outstanding or authorized stock 
appreciation, phantom stock, profit participation or similar rights with 
respect to the Company, nor is the Company under any obligation to issue any 
such rights, and all of those listed in the Disclosure Schedule shall have 
been discharged by the Company at or prior to the Closing.  There are no 
voting trusts or other agreements or understandings to which the Company or

                                       4

<PAGE>

any Shareholder is a party with respect to the voting of the capital stock of 
the Company.

         (c)  AUTHORITY.  The Company has all requisite corporate power and 
authority to execute and deliver this Agreement and subject to approval of 
the Merger by the shareholders of the Company to consummate the transactions 
contemplated hereby.  The execution and delivery of this Agreement by the 
Company and the consummation by the Company of the transactions contemplated 
hereby have been duly authorized by all necessary corporate action on the 
part of the Company, subject to approval of the Merger by the shareholders of 
the Company prior to the Closing.  The Company has complied with all 
applicable laws with respect to solicitation of shareholder approval of the 
Merger, and, except for statutory dissenters' rights, no Shareholder is 
entitled to make any claim against the Company with respect thereto.

         (d)  BINDING OBLIGATION.  This Agreement has been duly executed and 
delivered by the Company and, subject to approval of the Merger by the 
shareholders of the Company prior to the Closing, constitutes a valid and 
binding obligation of the Company enforceable in accordance with its terms, 
except as enforcement may be limited by bankruptcy, insolvency or other 
similar laws affecting the enforcement of creditors' right generally, and 
except that the availability of equitable remedies, including specific 
performance, is subject to the discretion of the court before which any 
proceeding therefor may be brought.

         (e)  NO DEFAULT.  Except as set forth in the Disclosure Schedule, 
the execution and delivery of this Agreement by the Company do not, and the 
consummation by the Company of the transactions contemplated hereby and 
compliance by the Company with the provisions hereof will not, conflict with, 
or result in any violation of, or default (with or without notice or lapse of 
time, or both) under, give rise to a right of termination, cancellation or 
acceleration of any obligation under, or result in the creation of any lien, 
security interest, charge or other encumbrance upon any of the respective 
properties or assets of the Company under any of the terms, conditions or 
provisions of the Articles of Incorporation or Bylaws of the Company or any 
loan or credit agreement, note, bond, mortgage, indenture, lease, conditional 
sale or other agreement, instrument, permit, concession, franchise, license, 
judgment, order, decree, statute, law, ordinance, rule, regulation, code, 
writ or injunction applicable to the Company, or its properties or assets, 
other than such conflicts, violations, defaults, terminations, cancellations 
or accelerations which individually or in the aggregate do not have a 
material adverse effect on the financial condition of the Company.

         (f)  CONSENTS.  No exemption, consent, approval, order or
authorization of, or registration, declaration or filing with, any court,
administrative agency or commission or other governmental authority or
instrumentality domestic or foreign (a "Governmental Entity"), or of the
shareholders of the Company or of any

                                       5

<PAGE>


other third party is required by, or with respect to, the Company, in 
connection with the execution and delivery of this Agreement by the Company 
or the consummation by the Company of the transactions contemplated hereby, 
except for (i) the approval of the Merger by the shareholders of the Company 
prior to the Closing, and (ii) the filing of the Merger Documents with the 
Secretary of State of the State of Washington and appropriate documents with 
the relevant authorities of other states in which the Company is qualified to 
do business.

         (g)  FINANCIAL STATEMENTS AND REPORTS.  The Company has furnished 
Acquiror with true copies of balance sheets of the Company as of April 30, 
1997, and the related statements of income, changes in stockholders' equity, 
and changes in financial position for each of the years then ended, in each 
case as audited by Deloitte & Touche, certified public accountants, and an 
interim balance sheet as of June 30, 1997, together with the related 
statement of income for the  two -month period then ended.  (Such balance 
sheets and related statements of income, changes in stockholders' equity (for 
the year-end statements only), and changes in financial position (for the 
year-end statements only), are sometimes referred to together as the "Company 
Financial Statements.")  Except to the extent stated therein, the Company 
Financial Statements have been prepared in accordance with generally accepted 
accounting principles (except for the omission of notes to interim statements 
and year-end adjustments to interim results), applied on a consistent basis 
with all prior periods and fairly presented the financial position of the 
Company as of the dates indicated and the results of operations and changes 
in financial position for the periods indicated, subject, in the case of 
interim financial statements, to normal year-end adjustments.  The Company 
does not have any liability or obligation which is not accrued or reserved 
against in the Company Financial Statements and is required to be so accrued 
or reserved.

         (h)  LIABILITIES.  The Company has no liabilities or obligations of 
any nature or of any amount whatsoever, whether accrued, absolute, liquidated 
or unliquidated, contingent or otherwise, and there is no basis for any 
present or future action, suit, proceeding, hearing, investigation, charge, 
complaint, claim or demand against the Company which might give rise to 
obligations or liabilities of the Company, except:

              (i)   to the extent reflected in the Company Financial 
Statements and not already paid or discharged;

              (ii)  to the extent disclosed in this Agreement and the 
schedules hereto; and

              (iii) those expressly approved in writing by Acquiror and 
Acqcorp.

                                       6

<PAGE>

         (i)  COMPLIANCE WITH APPLICABLE LAWS.  The Company holds, and at all 
times relevant hereto has held, all material licenses, franchises, permits 
and authorizations necessary for the lawful conduct of its business under and 
pursuant to all, and has complied with and is not in default in any respect 
under any applicable law, ordinance, regulation, statute, order, rule, 
policy, or guideline of any Governmental Entity, except for possible 
violations which individually or in the aggregate do not have a material 
adverse effect on the financial condition of the Company.  No investigation 
or review by any Governmental Entity of the Company is pending or, to the 
knowledge of the Company, threatened, nor has any Governmental Entity 
indicated to the Company an intention to conduct the same.

         (j)  LITIGATION.  Except as set forth in the Disclosure Schedule, 
the Company is not a party to any, and there are no pending or, to the best 
of the Company's knowledge, threatened, material legal, administrative, 
arbitral or other proceedings, claims, actions or governmental investigations 
of any nature against the Company or challenging the validity or propriety of 
the transactions contemplated by this Agreement and, to the best of the 
Company's knowledge, there is no reasonable basis for any other material 
proceeding, claim, action or governmental investigation against the Company.  
The Company is not a party to any order, judgment or decree which will, or 
might reasonably be expected to, materially adversely affect the business, 
operations, properties, assets or financial condition of the Company.

         (k)  CERTAIN AGREEMENTS.  Except as set forth in the Disclosure
Schedule, the Company is not a party to:

              (i)   Any agreement (or group of related agreements) for the 
lease of personal property to or from any person providing for lease payments 
in excess of $10,000 per year;

              (ii)  Any agreement (or group of related agreements) for the 
purchase or sale of raw materials, commodities, supplies, products or other 
personal property, or for the furnishing or receipt of services, the 
performance of which will extend over a period of time of more than one year, 
result in a material loss to the Company, or involve the payment of 
consideration in excess of $10,000 during the term of such agreement;

              (iii) Any agreement concerning a partnership or joint venture;

              (iv) Any agreement (or group of related agreements) under which 
the Company has created, incurred, assumed or guaranteed any indebtedness for 
borrowed money, or any lease obligation, in excess of $10,000 or under which 
it has imposed or granted a security interest on any of its assets, tangible 
or intangible;

                                       7



<PAGE> 

             (v)  Any agreement concerning confidentiality or noncompetition;

             (vi)  Any agreement with any of the Shareholders;

             (vii)  Any profit sharing, stock option, stock purchase, stock 
appreciation, deferred compensation, severance, or other plan or arrangement 
for the benefit of its current or former directors, officers or employees;

             (viii)  Any collective bargaining agreement;

             (ix)  Any agreement for the employment of any individual on a 
full-time, part-time, consulting or other basis providing annual compensation 
in excess of $10,000, or providing severance benefits, or which requires more 
than thirty (30) days notice of termination;

             (x)  Any agreement under which it has advanced or loaned any 
amount to any of its directors, officers and employees;

             (xi)  Any agreement under which the consequences of the default 
or termination could have a material adverse affect on the business, 
financial condition, operations, results of operations or future prospects of 
the Company; or

             (xii)  Any other agreement (or group of related agreements), the 
performance of which involves consideration in excess of $10,000.

    The Company has delivered to Acquiror a correct and complete copy of each 
written agreement listed in the Disclosure Schedule and a written summary 
setting forth the terms and conditions of each oral agreement (if any) 
referred to in the Disclosure Schedule. With respect to each such agreement: 
(i) with respect to the Company, the agreement is legal, valid, binding, 
enforceable and in full force and effect, and to the Company's knowledge, the 
agreement is legal, valid, binding, enforceable and in full force and effect 
with respect to each other party to the agreement; (ii) the agreement will 
continue to be legal, valid, binding, enforceable and in full force and 
effect on identical terms following the consummation of the transactions 
contemplated in this agreement; (iii) the Company is not in breach or default 
under any such agreement, and to the Company's knowledge, no other party is 
in breach or default under such agreement and no events or circumstances have 
occurred which could reasonably be anticipated to create a default under any 
such agreement; and (iv) to the Company's knowledge, no party has repudiated 
any provision of the agreement.




                                      8
<PAGE>

         (l)  CUSTOMERS AND SUPPLIERS. The Disclosure Schedule contains a 
true and complete list of all customers to which the Company provided goods 
or services invoiced at $10,000 or more in the aggregate in the one-year 
period ended April 30, 1997 and thereafter through the date of this 
Agreement.  The Disclosure Schedule contains a true and complete list of all 
persons who provided goods or services to the Company in the one-year period 
ended April 30, 1997 and thereafter through the date of this Agreement, to 
which the Company paid or is committed to pay $10,000 (or any lesser amount 
paid other than in the ordinary course of business) or more in the aggregate 
since the beginning of said period.  The Company's relations with the 
foregoing customers and suppliers are good and except as described in the 
Disclosure Schedule, there are no disputes between the Company and any of 
such customers and suppliers outstanding, or to the Company's knowledge, 
pending or threatened.  The Company's business with such customers and 
suppliers is current and to the Company's knowledge, expected to continue.  
True and complete copies of all contracts with the foregoing customers and 
suppliers have been delivered to Acquiror and are in full force and effect in 
accordance with their terms and there are no defaults or assertions of 
default thereunder.

         (m)  TITLE TO PERSONAL PROPERTY. Except as disclosed on the 
Disclosure Schedule, the Company has good and marketable title to all 
personal property and assets of every type and description used by it in its 
business, free and clear of any and all mortgages, liens, pledges, 
privileges, charges or encumbrances of every kind, nature and description; 
all properties and assets of the Company are in its possession or custody or 
under its control; and all of its operating assets are in good operating 
condition and repair, ordinary wear and tear excepted.  Except as disclosed 
on the Disclosure Schedule, the Company owns all of the personal property and 
other assets necessary for the operation of its business as it is currently 
being conducted.

         (n)  ACCOUNTS RECEIVABLE. All the accounts receivable of the 
Company reflected in the Company Financial Statements have been collected or 
are good and collectable in the aggregate recorded amounts thereof (less a 
reasonable amount for doubtful accounts as reflected in the Company Financial 
Statements), can reasonably be anticipated to be paid in full after good 
faith collection efforts, and are subject to no setoffs or counterclaims.

         (o)  INVENTORY. All of the inventory of the Company reflected in the
Company Financial Statements was in existence at the date thereof.  All such
inventory and all inventory items acquired since June 30, 1997 are of good and
merchantable quality and are usable in the ordinary course of the Company's
business except for damage or deterioration adequately covered by insurance or
by claims against financially responsible third parties, and subject to the
reserve for obsolescence set forth in the Company Financial Statements.  Such
inventories were valued at the lower of cost or net realizable value and were
determined in accordance with generally accepted accounting principles
consistently applied.




                                      9
<PAGE>

         (p)  INTELLECTUAL PROPERTIES. The Company owns or has the right to 
use pursuant to license, sublicense, agreement or permission all patents, 
patent rights, licenses, trademarks, trademark rights, trade names, trade 
name rights, service marks, service mark rights, copyrights and similar 
rights necessary for and material to the operation of its business as 
currently conducted.  Each item of intellectual property owned or used by the 
Company immediately prior to the Effective Time of the Merger will be owned 
or available for use by the Company on identical terms and conditions 
immediately following the Effective Time of the Merger.  The Company has 
taken all reasonably necessary action to maintain and protect each item of 
intellectual property that it owns or uses.  The Disclosure Schedule 
identifies all material patents, patent rights, licenses, trademarks, 
trademark rights, trade names, trade name rights, service marks, service mark 
rights, copyrights and similar rights used by the Company in its business.  
The Company has delivered to Acquiror true, correct and complete copies of 
all registrations, applications, licenses, agreements and permission for the 
intellectual property rights described in the Disclosure Schedule.  The 
Company is not infringing or otherwise acting adversely to the right of any 
other person under or in respect to, any patent, license, trademark, trade 
name service mark, copyright or similar intangible right, except as disclosed 
in the Disclosure Schedule.

         (q)  EMPLOYEES AND BENEFITS. The Disclosure Schedule lists all 
employee benefit plans covering the Company's employees and all collective 
bargaining or union agreements to which the Company is a party.  The Company 
is not a party to any multiemployer pension or other employee benefit plan 
subject to the Employment Retirement Security Act of 1974, as amended.  
Except as identified on the Disclosure Schedule, the Company has no written 
or oral employment agreements with any of its employees.  The Company has 
timely paid all withholding, FICA and other taxes required to be paid by it 
on behalf of its employees.

         (r)  LABOR MATTERS. The Disclosure Schedule lists all employees of 
the Company, their current compensation level and all accrued vacation and 
sick pay.  The Company is in compliance in all material respects with all 
applicable laws respecting employment and employment practices, terms and 
conditions of employment and wages and hours, the failure to comply with 
which would have a material adverse effect on the financial condition of the 
Company; there is no unfair labor practice complaint served against the 
Company; no grievance or arbitration proceeding is pending against the 
Company; no representation petition has been filed with the National Labor 
Relations Board and no organizational activity, to the knowledge of the 
Company, is occurring respecting the employees of the Company; and the 
Company has not experienced any work stoppage.

         (s)  CONDUCT OF BUSINESS, LICENSES, ETC. The Disclosure Schedule 
describes all permits, licenses, approvals and other authorizations from and 
registrations with federal, territorial, state, local and other governmental 
agencies necessary for the Company to conduct its business, all of which have 
been secured,



                                      10
<PAGE>

are valid and in full force and effect and are renewable in the ordinary 
course of business.  None of such permits, licenses, approvals or other 
authorizations and registrations shall be invalidated or become voidable as a 
result of the consummation of the transactions contemplated hereby.  No 
consent, approval or notice is necessary in connection with the consummation 
of the transactions contemplated hereby in order to maintain in full force 
and effect all of said permits, licenses, approvals, authorizations and 
registrations.  The operation of the Company in the past three years has not 
violated or infringed in any material respect any of said permits, licenses, 
approvals, authorizations, and registrations, and the Company has not been 
subject to any investigation, proceeding or action by any federal, 
territorial, state, local or other governmental agency resulting in any 
penalty, fine or other adverse ruling, order or report.  The products sold by 
the Company comply with all applicable regulatory approvals, all of which are 
currently in full force and effect.  The Disclosure Schedule lists all states 
in which the Company has qualified to do business as a foreign corporation.

         (t)  BANK ACCOUNTS. The Disclosure Schedule sets forth a complete 
and correct list of all bank accounts and safe deposit boxes of the Company.  
Except as set forth on such schedule, the Company has no other bank accounts, 
safe deposit boxes or other time or demand deposits, investment accounts or 
other liquid assets.  Such schedule shows the name of each such bank, 
financial institution or other depository, the address of same, and the 
account number and names of all persons authorized to draw thereon or who 
have access thereto.

         (u)  BANK LOANS. The Disclosure Schedule lists each of the loans and 
other agreements between the Company and Seafirst (the "Bank Loans").  With 
respect to each such agreement:  (i) with respect to the Company, the 
agreement is legal, valid, binding, enforceable and in full force and effect, 
and to the Company's knowledge, the agreement is legal, valid, binding, 
enforceable and in full force and effect with respect to Seafirst; (ii) the 
agreement will continue to be legal, valid, binding, enforceable and in full 
force and effect on identical terms following the consummation of the 
transactions contemplated in this agreement and Seafirst has consented to 
such continuation; (iii) the Company is not in breach or default under any 
such agreement; and (iv) to the Company's knowledge, Seafirst has not 
repudiated any provision of the agreement. The Company has no outstanding 
loans or agreements with any other bank except as listed in the Disclosure 
Schedule.

         (v)  CONDITION OF BUILDINGS AND EQUIPMENT. All of the buildings and 
equipment of the Company are in reasonably good working condition and repair, 
ordinary wear and tear excepted, and to the Company's knowledge are in 
conformity with all applicable ordinances and regulations and building, 
zoning, and other laws.  The Company shall, until the Effective Time of the 
Merger, continue to maintain all of its material assets in conformity with 
its present practices and cause it to continue to carry its existing 
insurance on such assets.




                                      11
<PAGE>

         (w)  ABSENCE OF CERTAIN CHANGES OR EVENTS. Except as contemplated by 
this Agreement, since April 30, 1997, the Company, has conducted its business 
only in the ordinary course, and there has not been (i) any material adverse 
change with respect to the business, operations, prospects, properties, 
assets or financial condition or results of operations of the Company, (ii) 
any damage, destruction or loss, whether covered by insurance or not, which 
has or will have a material adverse effect on the financial condition of the 
Company, or (iii) except as approved by Acquiror any declaration, setting 
aside or payment of any dividend or other distribution (whether in cash, 
stock or property) with respect to any of the Company's capital stock or any 
redemption or other acquisition by the Company of capital stock or any 
agreement entered into with respect thereto.

         (x)  INSURANCE. The Company has furnished Acquiror with a complete 
list and brief description of all insurance policies carried by the Company 
as of the date hereof, which policies are maintained in full force and effect 
and provide for coverages which are usual and customary in the business of 
the Company as to amount and scope and as to which no notice of cancellation 
has been received.

         (y)  TAXES. The Company has filed all tax returns and reports as 
required by law and has paid all taxes and other assessments, including 
withholding, Social Security taxes, unemployment insurance, and workers' 
compensation premiums, by their respective due dates (including extensions 
thereof), except where any failure to file or pay, taken individually or in 
the aggregate, would not have a material adverse effect on the financial 
condition of the Company.  Each such return is true and correct in all 
material respects. The provision for taxes of the Company as shown in the 
Company Financial Statements is adequate for taxes due or accrued in 
accordance with generally accepted accounting principles and there is no 
audit exam, notice of deficiency, refund litigation, tax claim, or notice of 
assessment or proposed assessment pending or which the Company has received 
which is not included in such provision and the Company does not have any 
additional material liability for taxes.  The Company has not been audited by 
the Internal Revenue Service since the tax year ended April 30, 1990, or any 
agency of the State of Washington since June 1993.  The Company has not 
granted or been requested to grant waivers of any statute of limitations 
applicable to any claim for taxes.

         (z)  BROKERS. Except as set forth in the Disclosure Schedule, 
neither the Company, nor any of its officers or directors has retained, hired 
or employed any broker, investment banker or other firm or person in 
connection with the transactions contemplated hereby and, except as set forth 
in the Disclosure Schedule, no such agent, broker, banker, firm or person is 
or will be entitled to any broker's or finder's fee or any other commission 
or similar fee in connection with any of the transactions contemplated by 
this Agreement.




                                      12
<PAGE>

         (aa)  SAFETY LAWS. The Company has not violated any applicable 
statute, law or regulation relating to occupational health and safety 
("Safety Law") which will or could be reasonably anticipated to, have a 
material adverse effect on the Company's business, assets, liabilities, 
financial condition or operations and no material expenditures are or will be 
required in order to comply with any such existing statute, law or regulation.

         (ab)  MANUFACTURING AND MARKETING RIGHTS. Except as set forth in the 
Disclosure Schedule, the Company has not granted rights to manufacture, 
produce, assemble, license, market, or sell its products to any other person 
and is not bound by any agreement that affects the Company's exclusive right 
to develop, manufacture, assemble, distribute, market, or sell its products.

         (ac)  PRODUCT WARRANTY. Each product manufactured, sold, leased, or 
delivered by the Company has been in conformity with all applicable 
contractual commitments and all express and implied warranties in all 
material respects. Subject to any reserve for such claims set forth in the 
most recent balance sheet of the Company furnished to the Purchasers, the 
Company does not have any liability (contingent or accrued) for, and there is 
no basis for any present or future claim or action against the Company for, 
replacement or repair thereof or other damages or liability in connection 
with the manufacture, sale or use thereof.  Except as stated in the 
Disclosure Schedule, no product manufactured, sold, leased, or delivered by 
the Company is subject to any guaranty, warranty, or other indemnity beyond 
the applicable standard terms and conditions of sale or lease.  The 
Disclosure Schedule sets forth the material standard terms and conditions of 
sale or lease customarily used by the Company.

         (ad)  PRODUCT LIABILITY. The Seller does not have any liability (and 
there is no basis for any present or future action against it giving rise to 
any such liability) arising out of any injury to individuals or property as a 
result of the ownership, possession, or use of any product manufactured, 
sold, leased, or delivered by the Company or any predecessor of the Company, 
other than liability in an amount less than $10,000 in any one case or in the 
aggregate. The Company has no knowledge or reason to believe that any such 
action may be brought or threatened against the Company.  The Disclosure 
Schedule sets forth a list of all claims brought against the Company with 
respect to product liability within the last three years and the resolution 
of all such claims.

         (ae)  MINUTE BOOKS. The minute books of the Company contain complete 
and accurate records of all meetings and other corporate actions held or 
taken, since its formation, of its shareholders and of its Board of Directors 
(including committees of the Board of Directors where significant action were 
taken).  True and complete copies of such minute books have been furnished to 
Acquiror.




                                      13
<PAGE>

         (af)  AFFILIATE TRANSACTIONS. Except as specifically contemplated by 
this Agreement, or as reflected on the Disclosure Schedule, since April 30, 
1997, the Company has not engaged in, or agreed to engage in (whether in 
writing or orally), any transaction with any director or officer of the 
Company or any "affiliate" or "associate" (as such terms are defined in Rule 
405 promulgated under the Securities Act) involving aggregate payments by or 
to the Company of $10,000 or more during any consecutive 12-month period.

         (ag)  ENVIRONMENTAL COMPLIANCE. The Company's operations do not 
violate any applicable federal, state or local law, regulation, rule or order 
relating to air, water, or noise pollution, employee health or safety, or the 
production, storage, labeling, transportation or disposition of waste or 
hazardous toxic substances (collectively, "Environmental Law").  Except as 
set forth on the Disclosure Schedule, no licenses or permits are required to 
be filed by the Company under any applicable Environmental Law with respect 
to the Company's operations.  The Company has no knowledge that any other 
person has stored any chemical or hazardous substances, including any 
"Hazardous Substances," "Pollutants" or "Contaminants" (as such terms are 
defined in the Comprehensive Environmental Response, Compensation and 
Liability Act of 1980, as amended ("CERCLA")), asbestos, petroleum products, 
or polychlorinated biphenyls (collectively referred to herein as "Hazardous 
Substances") on, beneath or about any of the owned or leased properties of 
the Company or on, beneath or about any other property previously owned or 
leased by the Company.  The Company knows of no condition relating to or 
resulting from a release or discharge which has resulted or could result in 
any damage, loss, cost expense, claim, demand, order or liability to or 
against the Company or Acquiror or Acqcorp by any governmental authority or 
other third party relating to or resulting from the Company's operations.  
The Company has not received any notice from any governmental authority or 
private or public entity advising the Company that it is potentially 
responsible for response costs with respect to a release or threatened 
release of any Hazardous Substances.  The Company has no knowledge that any 
other person has, buried, dumped or otherwise disposed of any Hazardous 
Substances on, beneath or about any of the owned or leased properties of the 
Company or on, beneath or about any other property previously owned or leased 
by the Company.  The Company has not received notice of any violation of any 
Environmental Law or zoning or land use ordinance, law or regulation relating 
to the Company's operations including, but not limited to, CERCLA, the Toxic 
Substances Control Act of 1976, as amended, the Resource Conservation 
Recovery Act of 1976, as amended, the Clean Air Act, as amended, the Federal 
Water Pollution Control Act, as amended, or the Occupational Safety and 
health Act of 1970, as amended, nor is the Company aware of any such 
violation.

         (ah)  DISCLOSURE. None of the statements or information made or 
contained in any of the representations or warranties of the Company set 
forth or to be set forth in this Agreement or in any of the schedules, 
exhibits, lists, certificates



                                      14
<PAGE>

or other documents specifically referred to herein and delivered by or on 
behalf of the Company to the Acquiror pursuant to this Agreement in 
connection with the transactions contemplated hereby, contains or will 
contain any untrue statement of a material fact or omits or will omit to 
state any material fact required to be stated herein or therein or necessary 
to make the statements or information contained herein or therein in light of 
the circumstances under which they are made, not misleading in any material 
respect.

    3.2  REPRESENTATIONS AND WARRANTIES OF ACQUIROR AND ACQCORP. Acquiror and 
Acqcorp jointly and severally represent and warrant to the Company as follows:

         (a)  ORGANIZATION, STANDING AND POWER. Each of Acquiror and Acqcorp 
(collectively sometimes herein referred to as the "SI Group") is a 
corporation duly authorized, validly existing and in good standing under 
Delaware and Washington law, respectively.  Each has all requisite corporate 
power and authority to own, lease and operate its properties and to carry on 
its business as now being conducted, and is duly licensed or qualified to do 
business in each jurisdiction in which the nature of its business or the 
ownership or leasing of its properties or assets makes such licensing or 
qualification necessary, except where failure to be so licensed or qualified 
would not have a material adverse effect on SI.  Acquiror has delivered to 
the Company complete and correct copies of the Articles of Incorporation and 
Bylaws of each company in the SI Group as amended to the date hereof.

         (b)  AUTHORITY. Acquiror and Acqcorp each has all requisite 
corporate power and authority to execute and deliver this Agreement and to 
consummate the transactions contemplated hereby.  The execution and delivery 
of this Agreement by Acquiror and Acqcorp and the consummation by Acquiror 
and Acqcorp of the transactions contemplated hereby have been duly authorized 
by all necessary corporate action on the part of Acquiror and Acqcorp.  This 
Agreement has been duly executed and delivered by Acquiror and Acqcorp and 
constitutes a valid and binding obligation of Acquiror and Acqcorp 
enforceable in accordance with its terms, except as enforcement may be 
limited by bankruptcy, insolvency or other similar laws affecting the 
enforcement of creditors' rights generally, and except that the availability 
of equitable remedies, including specific performance, is subject to the 
discretion of the court before which any proceeding therefor may be brought.  
The execution and delivery of this Agreement do not, and the consummation of 
the transactions contemplated hereby and the compliance with the provisions 
hereof will not, conflict with, or result in any violation of, or default 
(with or without notice or lapse of time, or both) under, or give rise to a 
right of termination, cancellation or acceleration of any obligation under, 
any provisions of the laws of the United States or the State of Washington, 
including laws against fraudulent conveyances, the Articles of Incorporation 
or By-Laws of Acquiror and Acqcorp. No exemption, consent, approval, order or 
authorization of, or registration, declaration or filing with, any 
Governmental Entity or any other third party is required by, or with respect 
to, Acquiror or Acqcorp 



                                      15
<PAGE>

in connection with the execution and delivery of this Agreement by Acquiror 
and Acqcorp or the consummation by Acquiror and Acqcorp of the transactions 
contemplated hereby, except for the filing of the Merger Documents with the 
Secretary of State of the State of Washington.

         (c)  BROKERS. Except as set forth in the Disclosure Schedule, 
neither Acquiror nor any of its officers or directors has retained, hired or 
employed any broker, investment banker or other firm or person in connection 
with the transactions contemplated hereby and no such agent, broker, banker, 
firm or person is or will be entitled to any broker's or finder's fee or any 
other commission or similar fee in connection with any of the transactions 
contemplated by this Agreement.

    3.3  REPRESENTATIONS AND WARRANTIES OF THE SHAREHOLDERS. Each Shareholder 
represents and warrants that

         (a)  shares of the Company which he owns and shares of the Company 
owned by persons or entities with which he is affiliated, as disclosed in the 
Disclosure Schedule, are owned free and clear of all liens, claims and 
encumbrances, and are subject to no options, warrants, contracts, purchase 
rights or agreements of any kind, except for this Agreement,

         (b)  he has the power to enter into this Agreement and to carry out 
his obligations hereunder,

         (c)  the execution and performance of this Agreement do not violate, 
or result in a breach of, or constitute any default under any judgment, order 
or decree to which such Shareholder may be subject or constitute a violation 
of or conflict with any duty to which such Shareholder is subject,

         (d)  the approval of the Plan of Merger and the surrender of shares 
of the Company pursuance thereto by any shareholder with which the 
Shareholder is affiliated that is not a natural person has been duly 
authorized by all necessary action on the part of such shareholder and does 
not violate, or result in a breach of, or constitute any default under, any 
judgment, order or decree to which such shareholder may be subject or 
constitute a violation of, or conflict with any duty to which such 
shareholder is subject,

         (e)  there is no pending or threatened material, legal, 
administrative, arbitral or other proceeding, claim, action or governmental 
investigation against him or any shareholder with which he is affiliated 
challenging the transactions contemplated by this Agreement,




                                      16
<PAGE>

         (f)  neither he nor any shareholder with which he is affiliated has 
retained, hired or employed any broker, investment banker or other firm or 
person in connection with the transactions contemplated hereby and, except as 
set forth in the Disclosure Schedule, no agent, broker, banker, firm or 
person is or will be entitled to any broker's or finder's fee or any other 
commission or similar fee in connection with any of the transactions 
contemplated by this Agreement.

    The liability of any Shareholder for the foregoing representations and 
warranties is individual and not joint and several, is limited to the 
consideration received by such Shareholder and by any shareholder with which 
he is affiliated and is limited to claims made within one year after the 
effective date of the Merger.


                                   ARTICLE 4

                                   COVENANTS

    4.1  COVENANTS OF THE COMPANY RELATING TO CONDUCT OF BUSINESS. During the 
period from the date of this Agreement and continuing until the Effective 
Time of the Merger (except as Acquiror shall consent in writing, which 
consent shall not be unreasonably withheld), the Company and the Shareholders 
agree that

         (a)  ORDINARY COURSE. Except as provided in paragraph (b) of this 
Section 4.1, the Company shall carry on its respective businesses in the 
usual, regular and ordinary course in substantially the same manner as 
heretofore conducted and, to the extent consistent with such business and 
except as provided in paragraph (b) of this Section 4.1, use its best efforts 
to preserve intact its present business organizations, keep available the 
services of its present employees and preserve its relationships with 
customers, depositors, suppliers and others having business dealings with it 
to the end that its goodwill and ongoing businesses shall be unimpaired at 
the Effective Time of the Merger.  The Company will not enter into any 
merger, consolidation or other business combination, or agreement therefor, 
with any entity, nor make available to any person not affiliated with it any 
information about its business or organization that is not routinely made 
available to the public generally, except as may be required by law or 
regulation or pursuant to this Agreement.

         (b)  DIVIDENDS; CHANGES IN STOCK. The Company shall not (i) declare, 
set aside or pay any dividends on, or make other distributions in respect of, 
any of its capital stock, if such dividend or distribution would preclude the 
Company from satisfying the conditions of Section 5.2(j), (ii) split, combine 
or reclassify any of its capital stock or issue or authorize or propose the 
issuance of any other securities in respect of, in lieu of or in substitution 
for shares of capital stock of the Company, or (iii) repurchase, redeem or 
otherwise acquire, any shares of its capital stock or any of its other 
outstanding securities.




                                      17
<PAGE>

         (c)  ISSUANCE OR SALE OF SECURITIES. Except, in connection with 
employees exercising their stock options, the Company will not issue, deliver 
or sell, or authorize or propose the issuance, delivery or sale of, any 
shares of its capital stock of any class, or any securities convertible into, 
or any rights, warrants or options to acquire, any such shares or convertible 
securities, or enter into any agreement obligating the Company to issue, 
deliver or sell any such shares, rights, warrants, options or securities, and 
the Shareholders shall not enter any agreement with respect to the sale of 
the Shares or any warrants, options or other rights to purchase any 
securities of the Company.

         (d)  CHARTER DOCUMENTS. The Company shall not amend or propose to 
amend its Articles of Incorporation or Bylaws.

         (e)  NO ACQUISITIONS. The Company shall not organize, acquire or 
agree to acquire by merging or consolidating with, or by purchasing a 
substantial portion of the assets of, or by any other manner, any business or 
any corporation, partnership, association or other business organization or 
division thereof or otherwise acquire or agree to acquire any assets which 
are material, individually or in the aggregate, to the Company other than in 
the ordinary course of business.

         (f)  NO DISPOSITIONS. The Company shall not sell, lease, encumber, 
pledge, grant a security interest in, or otherwise dispose of, or agree to 
sell, lease or otherwise dispose of, any of its assets (including any 
interest therein) which are material, individually or in the aggregate, to 
the Company, other than in the ordinary course of business consistent with 
past practices and policies; PROVIDED HOWEVER, that Company shall, prior to 
the Closing, close down or dispose of its European subsidiary, Aero-Go Europe 
N.V.

         (g)  COMPENSATION AND BENEFITS. The Company shall not grant any 
officer, employee or director any increase in compensation or in severance or 
termination pay, or enter into or amend or make any commitment to enter into 
or amend any employment, consulting, severance or salary continuation 
agreement with any officer, employee or director or any bonus, incentive 
compensation, deferred compensation, profit sharing, retirement, pension, 
group insurance or other benefit plan, or any policies or past practices with 
respect to vacation, termination, severance, and leave pay and benefits, 
except as may be required under employment or termination agreements in 
effect on the date of this Agreement or pursuant to this Agreement and except 
in accordance with the Company's established policies with respect to timing 
and amounts of such increases or the payment of bonuses; or to negotiate or 
otherwise make any commitment or incur any liability or obligation, to any 
labor organization not binding and enforceable against the Company and its 
subsidiaries on the date of this Agreement.




                                      18
<PAGE>

         (h)  CAPITAL EXPENDITURES. The Company shall not make any capital 
expenditures in excess of (i) $5,000 per project or related series of 
projects, or (ii) $20,000 in the aggregate, other than pursuant to binding 
commitments existing on the date hereof and other than expenditures necessary 
to maintain existing assets in good repair.

         (i)  DEBT. The Company shall not incur debt other than in the 
ordinary course of business.

         (j)  GOOD REPAIR. The Company shall not fail to maintain all of its 
properties in good repair, order and condition; or fail to maintain insurance 
upon all of its properties and with respect to the conduct of its business in 
amount and kind as now in existence if available at rates substantially 
similar to those now in effect and, if not available at such rates, in such 
amount and kind as would be appropriate in the exercise of good business 
judgment.

         (k)  COMMITMENTS. The Company shall not, except as otherwise 
contemplated hereby, enter into any other agreements, commitments or 
contracts which, individually or in the aggregate, are material to the 
Company except agreements, commitments or contracts entered into in the 
ordinary course of business.

         (l)  REAL ESTATE. The Company shall not make any investment or 
commitment to invest in real estate.

         (m)  OTHER ACTIONS. Neither the Company nor the Shareholders shall 
take any action that would result in any of the representations and 
warranties of the Company set forth in this Agreement becoming untrue in any 
material respect or in any of the conditions to the Merger set forth in 
Article V not being satisfied in any material respect, except as otherwise 
contemplated or required by this Agreement.

    4.2  ACCESS TO INFORMATION.

         (a)  The Company and the Shareholders shall afford to Acquiror and 
to Acquiror's accountants, counsel and other representatives access during 
normal business hours during the period prior to the Effective Time of the 
Merger, subject to reasonable notice, to all its properties, books, 
contracts, commitments, records, reports and other information, including the 
work papers of the Company's accountants, any reviews, examinations, or 
reports by such accountants, for the purpose of conducting an investigation 
of the Company related to the Merger on an ongoing basis until the Effective 
Time of the Merger; provided, however, that such investigation shall be 
conducted in a manner that does not unreasonably interfere with the normal 
operations and employee relations of the Company.  Acquiror and Acqcorp on 
the one hand, and Company and the Shareholders on the other, will hold 
nonpublic information received from the other ("Confidential Information") in 
confidence until



                                      19
<PAGE>

such time as such information otherwise becomes publicly available.  In the 
event of termination of this Agreement for any reason each shall promptly 
return all documents containing Confidential Information obtained from the 
other and any copies made of such documents.  This covenant of 
confidentiality shall survive any termination of this Agreement, any other 
provision notwithstanding provided, however, that the obligation to keep such 
Confidential Information confidential shall not apply to (i) any information 
which (A) a party can establish by convincing evidence was already in its 
possession prior to the disclosure thereof by the other; (B) was then 
generally known to the public; (C) became known to the public other than as a 
result of actions by the other; or (D) was disclosed by a third party not 
bound by an obligation of confidentiality; or (ii) disclosures in accordance 
with the federal securities laws or pursuant to an order of a court of 
competent jurisdiction.

    4.3  EXPENSES. Whether or not the Merger is consummated, all costs and 
expenses incurred in connection with this Agreement and the transactions 
contemplated hereby shall be paid by the party incurring such costs and 
expenses, provided, however, that any expenses incurred by the Company 
related to closing down or disposing of its European subsidiary, or legal, 
accounting, financial or advisory services incurred in connection with the 
transactions contemplated herein in excess of $150,000 and any excise, 
transfer and other similar taxes or assessments applicable to the 
transactions contemplated herein shall be considered expenses of the Aero-Go 
shareholders and shall be deducted (without reference to the proviso to 
Section 7.2) from the aggregate consideration payable pursuant to Section 
2.1(b) hereof, or, with the consent of Acquiror, such amount, or any portion 
thereof, shall be added to the amount of cash required to be reflected on the 
Closing Balance Sheet.

    4.4  ADDITIONAL AGREEMENTS. Subject to the terms and conditions of this 
Agreement, each of the parties hereto agrees to use all reasonable efforts to 
take, or cause to be taken, all action and to do, or cause to be done, all 
things necessary, proper or advisable under applicable laws and regulations 
to consummate and make effective the transactions contemplated by this 
Agreement. In case at any time after the Effective Time of the Merger any 
further action is necessary or desirable to carry out the purposes of this 
Agreement or to vest the Surviving Corporation with full title to all 
properties, assets, rights, approvals, immunities and franchises of either of 
the Constituent Corporations, the proper officers and directors of each 
corporation that is a party to this Agreement shall take all such necessary 
action.

    4.5  NO SOLICITATION. Neither the Shareholders nor the Company shall, 
directly or indirectly, encourage or solicit or, subject to the fiduciary 
duties of the Board of Directors of the Company, hold discussions or 
negotiations with, or provide any information to, any person, entity or group 
(other than Acquiror and Acqcorp) concerning any merger, sale of substantial 
assets not in the ordinary course of business, sale of shares of capital 
stock or similar transactions involving the Company or securities of the 
Company held by the Shareholders or their affiliates.  The 



                                      20
<PAGE>

Shareholders and the Company will use their best efforts to cause its 
officers, directors, employees, representatives, agents, or other persons 
controlled by the Company to abide by the foregoing restrictions.  The 
Shareholders and the Company will promptly communicate to Acquiror the terms 
of any proposal which it may receive in respect of any such transaction.

    4.6  CURRENT INFORMATION--THE COMPANY. During the period from the date of 
this Agreement to the Effective Time of the Merger, the Company will cause 
one or more of its designated representatives to confer on a regular basis 
with representatives of Acquiror to report the general status of the ongoing 
operations of the Company.  The Company will promptly notify Acquiror of any 
material change in the normal course of business or in the operation of the 
properties of the Company and of any governmental complaints, investigations 
or hearings (or communications indicating that the same be contemplated), or 
the institution or the threat of significant litigation involving the Company 
and will keep Acquiror fully informed of such events.

    4.7  DISPOSITION OF EUROPEAN SUBSIDIARY. Prior to the Closing, the 
Company shall have closed down or disposed of its European subsidiary, 
Aero-Go Europe N.V.  Except as provided in Section 4.3, the Company shall 
bear all expenses related to such termination.

    4.8  FAILURE TO FULFILL CONDITIONS. If any of the Shareholders, or the 
Company, determines that it will be unable to fulfill on or prior to the date 
set forth in Section 6.1(b) any of the material obligations required to be 
fulfilled as a condition to any other party's obligation to consummate the 
transactions contemplated hereby, such party will promptly notify the other 
parties.

    4.9  PURCHASE OF ACQUIROR COMMON STOCK. The Company and each of the 
Shareholders agree (and will cause each of the Company's directors and 
officers to agree) that, neither it nor any of its affiliates, nor any 
Shareholder, director or officer, shall engage in any purchase or sale of 
Acquiror's Common Stock (or any contract for or interest therein) at any time 
(a) between execution of this Agreement and the earlier of the date of filing 
of Acquiror's Form 8-K regarding the transaction contemplated herein, or the 
date of filing of Acquiror's first quarterly or annual report after the 
Closing, or (b) after the Closing if such Shareholders are then in possession 
of material non-public information concerning Acquiror or its business or 
plans.

<PAGE>

                                      ARTICLE 5

                           CONDITIONS PRECEDENT TO CLOSING

    5.1  CONDITIONS TO EACH PARTY'S OBLIGATIONS TO EFFECT THE MERGER.  The 
respective obligations of each party to effect the Merger are subject to the 
satisfaction prior to the Effective Time of the Merger of the following 
conditions:

         (a)  SHAREHOLDER APPROVAL.  This Agreement and the Merger and the 
transaction contemplated hereby, to the extent required, shall have been 
approved and adopted by the affirmative vote of the shareholders of the 
Company as required by the Washington Law.

         (b)  OTHER APPROVALS.  All authorizations, consents, orders or 
approvals of, or declaration or filings with, or expirations of waiting 
periods imposed by, any Governmental Entity (the "Governmental Approvals") 
necessary for the consummation of the transactions contemplated by this 
Agreement shall have been filed, occurred or been obtained, as the case may 
be, and no action, suit or proceeding by any Governmental Entity shall have 
been commenced for the purpose of postponing or preventing consummation of 
the Merger or the transactions contemplated hereby.

         (c)  NO INJUNCTIONS OR RESTRAINTS.  No temporary restraining order, 
preliminary or permanent injunction or other order issued by any court of 
competent jurisdiction shall be in effect, and no statute, rule, regulation 
or order of any  Governmental Entity shall have been enacted, promulgated or 
issued preventing consummation of the Merger or the transactions contemplated 
hereby.

    5.2  CONDITIONS OF OBLIGATIONS OF ACQUIROR AND ACQCORP.  The obligations 
of Acquiror and Acqcorp to effect the Merger and the transactions 
contemplated hereby are also subject to the satisfaction or waiver prior to 
the Effective Time of the Merger of the following conditions:

         (a)  The representations and warranties of the Company and the 
Shareholders contained in this Agreement shall be true and correct in all 
material respects as of and at the Effective Time of the Merger and shall 
have been true in all material respects at the date hereof, except for any 
changes approved by Acquiror in writing;

         (b)  The Company and the Shareholders shall have performed and 
complied in all material respects with all covenants, agreements, obligations 
and conditions contained in this Agreement that are required to be performed 
or complied with by it on or before the Effective Time of the Merger;

                                   22

<PAGE>

         (c)  The Chief Executive Officer of the Company shall have delivered 
to Acquiror at the Effective Time of the Merger a certificate certifying that 
the conditions specified in paragraphs (a) and (b) of this Section 5.2 have 
been fulfilled;

         (d)  Kurtis V. Kosty and  Peter J. Burger ("Key Employees") each 
shall execute and deliver to Acqcorp the Employment Consulting and 
Noncompetition Agreement substantially in the form of Exhibit 4(a) and 4(b), 
respectively, attached hereto;

         (e)  The Company shall have disposed of its subsidiary, Aero-Go 
Europe N.V.

         (f)  Acquiror shall have received from counsel for the Company, an 
opinion dated as of the Effective Time of the Merger as to the matters set 
forth in Sections 3.1(a), (b), (c) and (d) and to the knowledge of such 
counsel, Sections 3.1(e) and (f) in form and substance reasonably 
satisfactory to Acquiror and its counsel;

         (g)  All corporate proceedings in connection with the Merger and all 
documents incident thereto shall be reasonably satisfactory in form and 
substance to Acquiror and its counsel and they shall have received all such 
counterpart original and certified or other copies of such documents as they 
may reasonably request;

         (h)  Any consents, waivers, clearances, approvals and authorizations 
of regulatory or governmental bodies which are necessary in connection with 
the consummation of the transactions contemplated hereby shall have been 
obtained, and none of such consents, waivers, clearances, approvals or 
authorizations shall contain or impose any term, cost or condition which 
would, individually or in the aggregate, have a material adverse effect on 
the business, operations, properties, assets or financial condition of the 
Company or Acquiror and its subsidiaries taken as a whole.

         (i)  In addition to the approvals of any Governmental Entity 
described Section 5.1(b), Acquiror or the Company shall have obtained all 
necessary third-party consents or approvals reasonably required by the 
Acquiror in connection with or to consummate the Merger and the transactions 
contemplated hereby, and to retain the benefits and rights held by the 
Company, including without limitation any consents or assignments reasonably 
necessary in connection with any contract, agreement, or lease; except for 
any such consents or approvals the failure to obtain which, individually or 
in the aggregate, would not have a materially adverse effect on the 
operations or financial condition of the Company.

         (j)  The Company shall have delivered to Acquiror a Balance Sheet, 
dated as of the closing date (the "Closing Balance Sheet"), which shall 
reflect that the Company has (i) $1 million in cash (including amounts 
payable to the Company pursuant to the Letter of credit set forth on the 
Disclosure Statement), (ii) shareholder 

                                      23

<PAGE>

equity of  not less than $2,000,000 and; (iii) long-term debt, including the 
current portion of any bank debt, not to exceed $400,000 in the aggregate, as 
of the Closing Balance Sheet date.  The Closing Balance Sheet shall be 
prepared in accordance with generally accepted accounting principles, applied 
on a consistent basis with the Company Financial Statements and shall fairly 
present the financial position of the Company as of the Closing Date.

    5.3  CONDITIONS OF OBLIGATIONS OF THE COMPANY.  The obligations of the 
Company and Shareholders to effect the Merger are also subject to the 
satisfaction or waiver prior to the Effective Time of the Merger of the 
following conditions:

         (a)  The representations and warranties of Acquiror and Acqcorp 
contained in this Agreement shall be true and correct in all material 
respects as of and at the Effective Time of the Merger and shall have been 
true in all respects at the date hereof, except for any changes approved by 
the Company in writing;

         (b)  Acquiror and Acqcorp shall have performed and complied in all 
material respects with all covenants, agreements, obligations and conditions 
contained in this Agreement that are required to be performed or complied 
with by them on or before the Effective Time of the Merger;

         (c)  Duly authorized officers of Acquiror and Acqcorp shall have 
delivered to the Company at the Effective Time of the Merger a certificate 
certifying that the conditions specified in paragraphs (a) and (b) of this 
Section 5.3 have been fulfilled; and

         (d)  Any consents, waivers, clearances, approvals and authorizations 
of regulatory or governmental bodies which are necessary in connection with 
the consummation of the transactions contemplated hereby shall have been 
obtained, and none of such consents, waivers, clearances, approvals or 
authorizations shall contain or impose any term, cost or condition which 
would, individually or in the aggregate, have a material adverse effect on 
the business, operations, properties, assets or financial condition of 
Acquiror and its subsidiaries, including the Surviving Corporation, taken as 
a whole.

         (e)  In addition to the approvals of any Governmental Entity 
described in Section 5.1(b), Acquiror or the Company shall have obtained all 
necessary third-party consents or approvals reasonably required in connection 
with or to consummate the Merger and the transactions contemplated hereby, 
and to retain the benefits and rights held by the Company, including without 
limitation any consents or assignments reasonably necessary in connection 
with any contract, agreement, or lease; except for any such consents or 
approvals the failure to obtain which, individually or in the aggregate, 
would not have a materially adverse effect on the 

                                  24

<PAGE>

operations or financial condition of Acquiror and its subsidiaries, including 
the Surviving Corporation, taken as a whole.

                                 ARTICLE 6

                      TERMINATION, AMENDMENT AND WAIVER

    6.1  TERMINATION.  This Agreement may be terminated at any time prior to 
the Effective Time of the Merger, whether before or after approval of matters 
presented in connection with the Merger by the shareholders of the Company:

         (a)  By mutual consent of Acquiror, Acqcorp and the Company;

         (b)  By any party if the Effective Time of the Merger shall not have 
occurred on or prior to July 22, 1997, unless the failure of such occurrence 
shall be due to the failure of the party seeking to terminate this Agreement 
to perform or observe its agreements and conditions set forth herein to be 
performed or observed by such party on or before the Effective Time if the 
Merger;

         (c)  by Acquiror (i) if at the time of such termination there shall 
be a material adverse change in the financial condition of the Company from 
that existing on the date of this Agreement, except for any changes permitted 
by this Agreement, it being understood that any of the matters disclosed 
herein are not deemed to be a material adverse change for the purposes of 
this paragraph (c); or (ii) if there shall have been any material breach of 
any obligation of the Company or the Shareholders hereunder and such breach 
shall have not been remedied within 30 days after receipt by the Company of 
notice in writing from Acquiror specifying the nature of such breach and 
requesting that it be remedied; and

         (d)  by the Company, (i) if at the time of such termination there 
shall be a material adverse change in the consolidated financial condition of 
Acquiror from that existing on the date of this Agreement, except for any 
changes permitted by this Agreement, it being understood that any of the 
matters disclosed herein are not deemed to be a material adverse change for 
purposes of this paragraph (d); or (ii) if there shall have been any material 
breach of any obligation of Acquiror or Acqcorp hereunder and such breach 
shall not have been remedied within 30 days after receipt by Acquiror of 
notice in writing from the Company specifying the nature of such breach and 
requesting that it be remedied.

    6.2  EFFECT OF TERMINATION.  In the event of termination of this 
Agreement as provided in Section 6.1, this Agreement shall forthwith become 
void and there shall be no liability or obligation on the part of Acquiror, 
Acqcorp, or the Company or their respective officers or directors except as 
set forth in Sections 4.2 and 4.9 and except 

                                  25

<PAGE>

to the extent that such termination results from the breach by a party hereto 
of any of its representations, warranties, covenants or agreements set forth 
in this Agreement which arose out of acts occurring prior to termination, or 
arises out of, the termination

    6.3  AMENDMENT.  This Agreement may be amended by mutual consent of the 
parties hereto at any time before or after the approval of the Merger by the 
shareholders of the Company but, after any such approval, no amendment shall 
be made which reduces the amount or changes the form of consideration to be 
paid to the shareholders without further approval by such shareholders.  This 
Agreement may not be amended except by an instrument in writing signed on 
behalf of each of the parties hereto.

    6.4  EXTENSION; WAIVER.  At any time prior to the Effective Time of the 
Merger, the parties hereto may, to the extent legally allowed, (a) extend the 
time for the performance of any of the obligations or other acts of the other 
parties hereto, (b) waive any inaccuracies in the representations and 
warranties contained herein or in any document delivered pursuant hereto, and 
(c) waive compliance with any of the agreements or conditions contained 
herein.  Any agreement on the part of a party hereto to any such extension or 
waiver shall be valid only if set forth in an instrument in writing signed on 
behalf of such party.


                                  ARTICLE 7

                             GENERAL PROVISIONS

    7.1  LIMITED SURVIVAL OF REPRESENTATIONS, WARRANTIES AND AGREEMENTS. 
Representations, warranties, covenants and agreements in this Agreement and 
in any instrument delivered pursuant to this Agreement shall survive the 
Effective Time of the Merger for two (2) years (except for Section 3.1(y) as 
it relates to matters set forth in the Consent of Shareholder Representation 
dated as of the date hereof, as to which the indemnification obligation shall 
be limited to a maximum of $300,000, and which shall survive so long as any 
funds remain held subject to the terms of the Escrow Agreement) provided, 
that liability for breaches of the representations and warranties in Article 
3 of this Agreement shall be satisfied solely by recovery of the funds held 
in escrow.  In addition, claims not made prior to expiration of the relevant 
representations and warranties shall be barred.

    7.2  INDEMNIFICATION ESCROW.  The sum of $750,000 shall be retained in 
escrow from the funds due to Aero-Go shareholders under Section 2.1(b) after 
the Effective Date of the Merger to secure the indemnification obligations of 
the Company under Section 7.3.  The term, conditions and duration of the 
escrow shall be as set forth in the Escrow Agreement.

                                  26

<PAGE>

    7.3  INDEMNIFICATION BY THE COMPANY.  Subject to the limitations of 
Section 7, the Company hereby agrees to indemnify Acquiror and Acqcorp 
promptly against, and to hold them harmless from, any and all liability, 
loss, damage or injury, together with all reasonable costs and expenses 
relating thereto, including all reasonable legal and accounting fees and 
expenses, incurred or sustained by them arising from (i) any failure to 
fulfill, or other breach of, any representation or warranty of the Company or 
the Shareholders, or (ii) failure of the Company or the Shareholders to 
perform or to fulfill, or other breach or violation of, any covenant, 
agreement or other term obligating the Company or the Shareholders set forth 
in this Agreement, irrespective of any investigation that may be or may have 
been made by or for Acquiror or Acqcorp prior to the Effective Time of the 
Merger; provided, however, no claim for indemnification (aside from any 
expenses due from the Company pursuant to Section 4.3) may be made unless the 
aggregate amount of all indemnification claims exceeds $50,000.

    7.4  INDEMNIFICATION BY SHAREHOLDERS.  Subject to the limitations of 
Section 3.3 and Section 7.1, the Shareholders hereby agree to indemnify 
Acquiror and Acqcorp promptly against, and to hold them harmless from, any 
and all liability, loss, damage or injury, together with all reasonable costs 
and expenses relating thereto, including all reasonable legal and accounting 
fees and expenses, incurred or sustained by them arising from (i) any failure 
to fulfill, or other breach of, any representation or warranty of the 
Shareholders, or (ii) failure of the Shareholders to perform or to fulfill, 
or other breach or violation of, any covenant, agreement or other term 
obligating the Shareholders set forth in this Agreement, irrespective of any 
investigation that may be or may have been made by or for Acquiror or Acqcorp 
prior to the Effective Time of the Merger.

    7.5  INDEMNIFICATION BY ACQUIROR OR ACQCORP.  Acquiror and Acqcorp hereby 
agree to indemnify the Company and the shareholders of the Company promptly 
against, and to hold them harmless from any and all liability, loss, damage 
or injury together with all reasonable costs and expenses relating thereto, 
including all reasonable legal and accounting fees and expenses, incurred or 
sustained by them arising from any failure by Acquiror or Acqcorp to fulfill 
or other breach of any representation or warranty, or failure to perform or 
to fulfill or other breach or violation of, any covenant, agreement or other 
term obligating Acquiror or Acqcorp set forth in this Agreement, irrespective 
of any investigation that may be or may have been made by or for the Company 
or said shareholders prior to the Effective Time of the Merger.

    7.6  INDEMNIFICATION PROCEDURE.    (a) Following notice of a Claim, the 
Shareholder Representative, as appointed pursuant to the Escrow Agreement 
shall, using commercially reasonable efforts and at the expense of the 
shareholders, defend, contest or otherwise protect against such legal action, 
claim or proceeding with legal counsel of its own selection.  Acquiror shall 
have the right, but not the obligation, to participate, at its own expense, 
in the defense thereof through counsel of its own 

                                       27

<PAGE>

choice and shall have the right but not the obligation, to assert any and all 
cross claims or counterclaims it may have.  So long as the Shareholder 
Representative is using commercially reasonable efforts to defend any such 
legal action, claim or proceeding, Acquiror shall at all times cooperate in 
all reasonable ways with, make its relevant files and records available for 
inspection and copying by, and make its and the Company's employees available 
or otherwise render reasonable assistance to the Shareholder Representative 
in connection with the defense of such legal action, claim or proceeding and 
shall not without the prior written consent of the Shareholder Representative 
settle such action, claim or proceeding for which indemnification is sought 
under Section 7.3 of this Agreement.  In the event that the Shareholder 
Representative fails to use commercially reasonable efforts to timely defend, 
contest or otherwise protect against any such legal action, claim or 
proceeding, Acquiror shall have the right, but not the obligation, to defend, 
contest or otherwise protect against such legal action, claim or proceeding 
and claim any compromise or settlement thereof from the amounts held pursuant 
to the Escrow Agreement, including, without limitation, reasonable attorneys' 
fees, disbursements, and all amounts paid as a result of such legal action, 
claim or proceeding or any compromise or settlement thereof.  The Shareholder 
Representative shall not compromise or settle any matter if such compromise 
or settlement would have a material adverse effect on the Company or its 
business without the prior written consent of Acquiror, which consent shall 
not be unreasonably withheld.

         (b)  TAX MATTERS.  Notwithstanding any of the foregoing, Acquiror 
shall have the sole right to conduct any tax audit or other tax contest 
relating to Acquiror's and the Company's tax returns after the Closing Date, 
provided, that Acquiror will not amend the Company's tax returns for periods 
prior to the Effective Time without the written consent of the Shareholder 
Representative, nor shall Acquiror or the Company file any tax returns 
relating to periods prior to the Effective Time of the Merger without the 
consent of the Shareholder Representative, which will not be unreasonably 
withheld.  In the event any indemnifiable loss arises out of any such tax 
audits, Acquiror will notify the Shareholder Representative and allow them to 
comment on any written submissions relating to indemnifiable Losses.  No such 
tax contest or proceeding shall be paid, compromised or settled without the 
written consent of the Shareholder Representative, which consent shall not be 
unreasonably withheld; the fact that the settlement of a tax contest, or 
filing or amendment of a tax return,  may result in a loss to or an 
indemnification Claim by Acquiror shall not, absent a bona fide dispute with 
respect to the underlying tax liability giving rise thereto, constitute 
reasonable grounds to withhold consent.  Acquiror shall conduct any tax 
audits in good faith in order to minimize any indemnifiable losses payable by 
the shareholders.

    7.6. INSURANCE.  The Acquiror shall not make a claim for indemnification 
under Article 7 hereof without first using commercially reasonable efforts to 
obtain defense and/or indemnification under its insurance policies or those 
of the Company.  Any such claim shall be accompanied by an assignment to the 
Shareholder Representative 

                                      28

<PAGE>

of relevant insurance coverage.  Acquiror shall not cancel any Directors and 
Officers liability insurance policies of the Company in force at the 
Effective Time of the Merger prior to their normal renewal dates.

    7.7  ATTORNEYS' FEES.  In the event it is necessary for any party to 
engage an attorney to enforce the terms of this Agreement, the prevailing 
party shall, in addition to any other relief, be entitled to recover from the 
party in default attorneys' fees and costs, including any on appeal.

    7.8  NOTICES.  All notices and other communications hereunder shall be in 
writing and shall be deemed given if delivered personally or mailed by 
registered or certified mail (return receipt requested) to the parties at the 
following addresses (or at such other address for a party as shall be 
specified by like notice):

         (a)  If to Acquiror or Acqcorp, to

              SI Technologies, Inc.
              4611 South 134th Place
              Seattle, Washington  98168
              Attention:  Rick Beets, President and CEO

              With copy to:

              Benjamin F. Stephens
              Graham & James LLP/Riddell Williams P.S.
              1001 4th Avenue Plaza, Suite 4500
              Seattle, Washington 98154-1065

         (b)  If to the Company, to

              AeroGo, Inc.
              1170 Andover Park West
              Seattle, Washington  98188
              Attn:  Kurtis V. Kosty, President and CEO
              

              With copy to:

              Wilbert C. Anderson           
              Stoel Rives LLP                    
              600 University Street, Suite 3600  
              Seattle, Washington 98101-3197     

              and

                                     29

<PAGE>

              Wiley P. Kitchell
              The Commerce Bank
              601 Union St.
              Suite 3600
              Seattle, WA 98101

         (c)  If to the Shareholder Representative, to

              Kurtis V. Kosty
              AeroGo, Inc.
              1170 Andover Park West
              Seattle, Washington 98188

              and

              Stanley B. McDonald
              520 Pike Street
              Seattle, Washington 98101

         (d)  if to a former shareholder of the Company, to the address at 
which payments to such shareholder, under the notes provided for in Sections 
2.1(b) and (c) hereof, are to be or were last made.

    7.9  INTERPRETATION.  When a reference is made in this Agreement to 
Sections, Schedules or Exhibits, such reference shall be to a Section, 
Schedule or Exhibit to this Agreement unless otherwise indicated.  The 
headings contained in this Agreement are for reference purposes only and 
shall not affect in any way the meaning or interpretation of this Agreement.  
Whenever the words "include," and "including" are used in this Agreement, 
they shall be deemed to be followed by the words "without limitation."  The 
term "to our knowledge" or similar terms mean the actual knowledge of facts 
or other information by the maker of the representation or warranty in which 
the term appears.

    7.10 COUNTERPARTS.  This Agreement may be executed in one or more 
counterparts, all of which shall be considered one and the same agreement and 
shall become effective when one or more counterparts have been signed by each 
of the parties and delivered to the other parties, it being understood that 
all parties need not sign the same counterpart.

    7.11 ENTIRE AGREEMENT; NO THIRD-PARTY BENEFICIARIES.  This Agreement 
(including the documents and instruments referred to herein) (a) constitutes 
the entire agreement and supersedes all prior agreements and understandings, 
both written and oral, among the parties with respect to the subject matter 
hereof and (b) is not 

                                  30

<PAGE>

intended to confer upon any person other than the parties hereto any rights 
or remedies hereunder.

    7.12 GOVERNING LAW.  This Agreement shall be governed by and construed in 
accordance with the laws of the State of Washington.

    7.13 PUBLICITY.  So long as this Agreement is in effect, no party to this 
Agreement shall, or shall permit any of its officers, directors or 
representatives to, issue or cause the publication of any press release, 
public announcement or other public statement with respect to the 
transactions contemplated by this Agreement without the prior consent of the 
other parties to this Agreement, which consent shall not be unreasonably 
withheld; provided, that without limiting the obligations of the parties to 
use their best efforts to consult with each other prior to any public 
announcement nothing contained herein shall restrict the ability of any party 
to issue any such announcement which such party believes in good faith to be 
required by law.

    7.14 ASSIGNMENT.  Neither this Agreement nor any of the rights, interests 
or obligations hereunder shall be assigned by any of the parties hereto 
without the prior written consent of the other parties, except that Acqcorp 
may assign, in its sole discretion, any or all of its rights, interests and 
obligations hereunder to Acquiror or to any direct or indirect wholly owned 
subsidiary of Acquiror.  Subject to the preceding sentence, this Agreement 
will be binding upon, inure to the benefit of and be enforceable by the 
parties and their respective successors and assigns.

                                    31

<PAGE>

    IN WITNESS WHEREOF, Acquiror, Acqcorp, and the Company have caused this 
Acquisition Agreement to be signed by their respective officers hereunto duly 
authorized and Shareholders have signed all as of the date first written 
above.

                             SI TECHNOLOGIES, INC., a Delaware 
                             corporation


                             By   Rick A. Beets
                                 ---------------------------------------
                              Its   Pres. & CEO
                                  --------------------------------------


                             SI ACQUISITION CORPORATION, a 
                             Washington corporation


                             By   Rick A. Beets
                                 ----------------------------------------
                              Its  President
                                  ---------------------------------------


                             AEROGO, INC., a Washington corporation


                             By   Kurtis V. Kosty
                                 ----------------------------------------
                              Its   President
                                  ---------------------------------------


                             Kurtis V. Kosty
                             --------------------------------------------
                             Kurtis V. Kosty


                             Peter J. Burger
                             --------------------------------------------
                             Peter J. Burger


                             Stanley B. McDonald
                             --------------------------------------------
                             Stanley B. McDonald


                                    32

<PAGE>

                             Robert J. Behnke
                             --------------------------------------------
                             Robert J. Behnke


                             T. Evans Wyckoff
                             --------------------------------------------
                             T. Evans Wyckoff

                                          33


<PAGE>



                    CLOSING AND INDEMNIFICATION ESCROW AGREEMENT

    THIS CLOSING AND INDEMNIFICATION ESCROW AGREEMENT ("Agreement") is made 
as of July 21, 1997, by SI TECHNOLOGIES INC., a Delaware corporation ("SI"), 
AeroGo, Inc., a Washington corporation ("Surviving Corporation"), Kurt Kosty 
and Stanley B. McDonald as representatives of the Shareholders of the 
Surviving Corporation ("SA") and FIRST TRUST National Association, as the 
Escrow Agent hereunder (the "Escrow Agent").

                                    RECITALS

    A.  SI, SI Acquisition Corp., a Washington corporation, which is a 
wholly-owned subsidiary of SI and AeroGo, Inc., a Washington corporation 
("Surviving Corporation") entered into an Acquisition Agreement including a 
Plan of Merger, dated as of July 21, 1997, as amended (the "Merger 
Agreement").

    B.  A true copy of the Merger Agreement has been delivered to the Escrow 
Agent.

    C.  Terms used herein and defined in the Merger Agreement shall wherever 
capitalized in this Agreement have the same meanings as in the Merger 
Agreement, except as otherwise defined herein or where the context clearly 
requires otherwise.

    D.  The Merger Agreement provides that as soon as practical after 
Closing, but no later than July 22, 1997, SF shall pay to Escrow Agent 
sufficient funds to cover the payments to the Surviving Corporation's 
shareholders provided for in the Merger Agreement, which funds are to be held 
and disbursed by the Escrow Agent in accordance with this Agreement.

    E.  Section 7.3 of the Merger Agreement provides that, at the Effective 
Time, $750,000 withheld from the amounts payable to the holders of Surviving 
Corporation Stock shall be deposited into escrow and shall be held and 
disbursed by the Escrow Agent in accordance with the indemnification 
provisions of this Escrow Agreement.  SCHEDULE 1 hereto contains a list of 
each such holder of Surviving Corporation Stock, setting forth for each such 
holder (hereinafter "Shareholder") the amount deposited (the "Shareholder 
Deposit"), such Shareholder's percentage share of the aggregate Shareholder 
Deposits ("Percentage Share"), and the address of each Shareholder as shown 
on Surviving Corporation's stock records, and the amount of each payment to 
be distributed to each Shareholder, subject to adjustment for indemnification 
claims pursuant to Section 7 of the Merger Agreement.

    F.  The purpose of this Agreement is to provide for the payment of the 
merger consideration provided for in the Merger Agreement and to secure any 
claims that SI may have against the Surviving Corporation after Closing for 
which SI is entitled to indemnification pursuant to Article 7 of the Merger 
Agreement.



                                       1

<PAGE>

    G.  Pursuant to the Merger Agreement, SA is appointed the representative 
of the Shareholders for the purposes of this Escrow Agreement.

        THEREFORE, in consideration of the mutual covenants contained in this 
Agreement and in the Merger Agreement, the parties hereby agree as follows:

    1.  ESTABLISHMENT OF FUND.

        1.1  As soon as practical after Closing, but no later than the 
Effective Time of the Merger, SI will deliver to Escrow Agent Six Million 
Dollars ($6,000,000) as the Merger Consideration to cover the payments 
provided in the Merger Agreement (the "Funds"), in immediately available 
funds by electronic bank fund transfer to:

        First Bank N.A.
        ABA #091000022
        Beneficiary:  First Trust
        Credit Account #180121167365
        For further Credit to Account 47300029
        Re:  SI Technologies, Inc.
        Attn:  Seattle Office/(Linda Houston 461-4105)

to be disbursed, in accordance with the Merger Agreement and this Agreement.

        1.2  By executing this Agreement, (i) Escrow Agent agrees to receive, 
hold and disburse the Escrowed Funds, subject to the terms and conditions of 
this Agreement; and (ii) SA agrees to act as representative of the 
Shareholders subject to the terms and conditions of this Agreement.

    2.  INVESTMENT OF FUNDS. The Escrow Agent shall establish an account in 
the name of itself as Escrow Agent.

        2.1  Funds will be invested in First American Managed Mutual Funds 
Treasury Obligations Fund.  Parties hereto acknowledge their receipt of the 
prospectus for the fund.  Interest earned in the escrow account will be 
reinvested.  All entities entitled to receive interest from the escrow 
account will provide Escrow Agent with a W-9 or W-8 IRS tax form prior to the 
disbursement of interest.  SA will be entitled to exercise all voting rights 
for the funds.

        2.2  Escrow Agent shall hold any income, interest or accretion with 
respect to the Funds as part of the Funds to be disposed of in such manner as 
the principal amount of the Funds.  For the purposes of this Agreement, the 
term "Funds" includes all the funds held hereunder, including the principal 
amount of the Funds and any income, interest or accretion with respect to 
such Funds.



                                       2

<PAGE>

    3.  ALLOCATION OF MERGER CONSIDERATION. The Merger Agreement provides 
that the Merger Consideration shall be $6,000,000.  The Merger Agreement 
further provides that each share of common stock, $.25 par value, of 
Surviving Corporation ("Surviving Corporation Common Stock") that is issued 
and outstanding immediately prior to the Effective Time shall be entitled to 
receive, upon tender of the certificate representing such share, the amounts 
set forth on the attached Payment Schedule.

    4.  RELEASE OF FUNDS. The Escrow Agent shall hold the Funds and any 
interest earned thereon and make disbursements as follows:

        4.1  PAYMENT TO SHAREHOLDERS. SI shall, immediately after the Closing 
Date, send to each holder of shares of Surviving Corporation Common Stock a 
transmittal letter satisfactory to SI and Escrow Agent instructing such 
holder how to tender such holder's shares after the Effective Time.  During 
the period commencing with the first business day following the Effective 
Time and continuing for six months after the Effective Time (the "Surrender 
Period"), each such holder of shares of Surviving Corporation Common Stock 
shall have the right to surrender for cancellation the certificate or 
certificates representing such shares to the Escrow Agent.  Attached hereto 
as SCHEDULE 1 (based on the Payment Schedule and approved by SI, SA and 
Surviving Corporation) is a list of all holders of Surviving Corporation 
Common Stock showing the certificate number, the number of Shares represented 
by such certificate, each holder's share of the Escrowed Funds, the amount of 
tax to be withheld, if any, and the net amount payable to each such holder.  
Upon surrender of any such certificate or certificates, such holder shall 
have the right to receive payment of the cash consideration for such shares 
in the amount set forth on the Payment Schedule, less amounts to be held in 
the Escrow subject to Article 7 of the Merger Agreement (the "Indemnification 
Funds").  If any cash consideration is to be paid to a person other than the 
person to whom the certificate surrendered in exchange therefor is 
registered, it shall be a condition of the payment that the certificate so 
surrendered shall be properly endorsed and otherwise in proper form for 
transfer, and that the person requesting such exchange pay to Escrow Agent 
any applicable transfer or other taxes required by reason of the transfer. 
The Escrow Agent shall accept, in lieu of the surrender of certificates 
representing shares of Surviving Corporation Common Stock as provided above, 
affidavits of the holders of any such shares that such certificates were 
lost, stolen or mutilated, together with such documentation and 
indemnification from such holders substantially in the form attached hereto 
as EXHIBIT A.  Upon delivery of the appropriate documents as provided above 
to the Escrow Agent, the Escrow Agent shall, as soon as practicable, but no 
later than August 22, 1997 (or, if delivery is made on or after August 22, 
1997, the next business day after delivery or the second business day 
following delivery of Schedule 1, whichever is later), deposit in the U.S. 
mails addressed to the appropriate payee (as provided above) the cash 
consideration provided for above.

         4.2  The Indemnification Funds are held in Escrow hereunder as 
security for the indemnity obligations of Surviving Corporation under Article 
7 of the Merger Agreement.  Payment for any amounts determined to be payable 
to SI shall be made out of the Indemnification Funds.  Upon Proper 
Authorization (as defined in Subsection 4.6 below) 


                                       3

<PAGE>

advising Escrow Agent that SI is entitled to an indemnification payment in 
accordance with Article 7 of the Merger Agreement, and PROVIDED THAT Escrow 
Agent has not received a written objection to such disbursement from SA 
within 30 days after SA's receipt of Proper Authorization, Escrow Agent shall 
on the following business day disburse from the Indemnification Funds the 
amount of such payment in accordance with disbursement instructions furnished 
by SI.  If Escrow Agent receives timely written objection to such 
disbursement from SA, Escrow Agent (1) will pay SI the portion of the 
disbursement not contested by SA and (2) will hold the remaining amounts 
pending resolution pursuant to Subsection 4.7.

         4.3  As provided in Article 7 of the Merger Agreement, pursuant to a 
Proper Authorization delivered by SI pursuant to Subsection 4.2 above prior 
to such anniversary, the Shareholders are entitled to receive $200,000 of the 
Escrowed Funds on the first anniversary of the Closing Date ("the First 
Payment Date") and $250,000 on the second anniversary of the Closing Date 
("the Second Payment Date"), which amounts shall be reduced by the following: 
 (i) any amounts paid prior to such anniversary pursuant to Subsection 4.2 
above; and (ii) any amounts subject to pending resolution on such anniversary 
pursuant to Subsection 4.7 below.  On the business day following the First or 
Second Payment Date, upon Proper Authorization advising Escrow Agent that the 
Shareholders are entitled to the amount determined in this Subsection 4.3, 
and PROVIDED THAT Escrow Agent has not received a written objection to such 
disbursement from SI within 30 days after SI's receipt of Proper 
Authorization, Escrow Agent shall disburse such amount to the Shareholders in 
accordance with disbursement instructions furnished by SA.  All disbursements 
to the Shareholders shall be made in proportion to their Percentage Share, as 
set forth on the Payment Schedule.  If Escrow Agent receives timely written 
objection to such disbursement from SI, Escrow Agent (1) will pay to the 
Shareholders, in accordance with disbursement instructions furnished by SA, 
the portion of the disbursement not contested by SI and (2) will hold the 
remaining amounts pending resolution of the objection pursuant to Subsection 
4.7.

         4.4   As provided in Article 7 of the Merger Agreement, the 
Shareholders are entitled to all the Funds remaining in Escrow, less any 
unresolved tax deficiencies or assessments and less any amounts subject to 
pending resolution pursuant to Subsection 4.7, on a date jointly specified in 
writing to the Escrow Agent by SI and SA (the "Final Payment Date").  The 
Final Payment Date shall be no later than the earlier of (a) the date on 
which the statute of limitations shall have expired with respect to the 
Surviving Corporation's federal income tax return for the period ending July 
31, 1997, including any extensions or suspensions of such assessment period, 
or (b) 90 days after the Internal Revenue Service has given the Surviving 
Corporation notice of a deficiency in taxes reported on the later of the 
federal income tax return for the Surviving Corporations (i) tax year ended 
April 30, 1997, and (ii) the period ended July 31, 1997.  On the business day 
following the Final Payment Date, upon a Proper Authorization delivered to it 
by SI pursuant to Subsection 4.2 advising the Escrow Agent that the 
Shareholders are entitled to disbursement of all remaining Funds, except 
amounts reserved for unresolved taxes and other matters, in accordance with 
Section 7 of the Merger Agreement, and PROVIDED THAT Escrow Agent has not 
received a written objection to such disbursement from SI within 30 days 
after SI's receipt of Proper Authorization, Escrow Agent shall disburse such 



                                       4

<PAGE>

amount to the Shareholders in accordance with disbursement instructions 
furnished by SA.  All disbursements to the Shareholders shall be made in 
proportion to their Percentage Share, as set forth on the Payment Schedule.  
If Escrow Agent receives timely written objection to such disbursement from 
SI, Escrow Agent (1) will pay SA the portion of the disbursement not 
contested by SI and (2) will hold the remaining amounts pending resolution of 
the objection pursuant to Subsection 4.7.

         4.5  When all Funds have been disbursed in accordance herewith, this
Agreement shall terminate (except for any amounts then owed to Escrow Agent
under the indemnification set forth in Section 9) and the Escrow shall be
closed.

         4.6  For purposes of this Agreement, "Proper Authorization" means:

              (i)  with respect to disbursements to SI under Subsection 4.2, 
an assignment of any relevant insurance coverage, and a written statement 
signed by SI specifying (a) that SI is entitled to an indemnification payment 
in accordance with Article 7 of the Merger Agreement, (b) the amount thereof 
and the party to which such disbursement is to be made, (c) setting forth in 
reasonable detail the basis of the claim of indemnity and the basis and 
manner of calculating the amount thereof, in accordance with Article 7 of the 
Merger Agreement, and (d) that SI has delivered or is concurrently delivering 
to SA (specifying the manner and date of delivery) a copy of the written 
statement submitted to Escrow Agent and specifying the date on which such 
copies shall be deemed to be received by SA in accordance with Subsection 
12.1.  SI shall deliver Proper Authorization for disbursement under 
Subsection 4.2 as promptly as practicable whenever an SI Indemnified Party 
shall have determined there are facts or circumstances that give rise to 
indemnification rights under Article 7 of the Merger Agreement (a "Claim"); 
provided, however, that the failure to give a timely notice of a Claim for 
indemnification shall not limit the indemnification obligations hereunder 
except to the extent that the delay in giving such notice materially 
adversely affects the ability of SA on behalf of the Surviving Corporation 
and the Shareholders to either defend against a Third Party Claim or mitigate 
Damages with respect to any Claim.  No Proper Authorization given by SI after 
the Final Payment Date shall be effective.  In the event of any Claim 
involving an action by a third party, SI, Surviving Corporation and SA shall 
cooperate in the prosecution or defense of the action in accordance with the 
provisions set forth in Article 7 of the Merger Agreement, and SI shall 
notify SA of the progress of any such Claim, shall permit SA to participate 
in such prosecution or defense as provided in Article 7 of the Merger 
Agreement and shall provide SA with reasonable access to all relevant 
information and documentation relating to the Claim and SI's and Surviving 
Corporation's prosecution or defense thereof.

              (ii) with respect to a disbursement to Shareholders under 
Subsections 4.3 or 4.4 hereof, a written statement by SA specifying (a) the 
Shareholders are entitled to a release of a certain portion of the 
Indemnification Funds in accordance with Section 7 of the Merger Agreement; 
(b) the amount of the release to which the Shareholders are entitled; and (c) 
that SA has delivered or is concurrently delivering to SI (specifying the 
manner and date of 


                                       5

<PAGE>

delivery) a copy of the written statement submitted to Escrow Agent and 
specifying the date on which such copies shall be deemed to be received by SI 
in accordance with Subsection 12.1;

              (iii)   with respect to any other disbursement or otherwise, 
written instructions signed on behalf of SI and SA authorizing Escrow Agent 
to undertake an action (and in the case of a disbursement, specifying the 
amount thereof and the party to which a disbursement is to be made), or a 
certified copy of an arbitration award or judgment of a court of competent 
jurisdiction in any action or proceeding arising out of Article 7 of the 
Merger Agreement or this Agreement.

         4.7  In the event that an objection to disbursement under 
Subsections 4.2, 4.3 or 4.4 hereof is timely made as provided therein, the 
parties will negotiate in good faith to resolve the controversy that is the 
subject of the objection.  If, within 30 days after an objection was received 
by SI or SA, as the case may be, SI and SA (on behalf of the Shareholders) 
have not arrived at a settlement agreement, SI and SA (on behalf of the 
Shareholders) shall promptly submit the dispute to binding, final and 
unappealable arbitration, to be held in Seattle, Washington, as follows:

              (i)   SI shall select one arbitrator, SA shall select one 
arbitrator and SI and SA together shall select a third arbitrator.  (If SI 
and SA cannot select a third arbitrator within five business days, the two 
arbitrators individually chosen by SI and SA shall select promptly the third 
arbitrator.)  Provided, however, that no arbitrator shall have rendered 
services, or shall be associated with any accounting firm, law firm or other 
company that has rendered services within the last three years to SI or to 
any Shareholder;

              (ii)   The arbitration shall be resolved in accordance with the 
Commercial Arbitration Rules of the American Arbitration Association;

              (iii)  Judgment may be rendered upon the award rendered by the 
arbitrators in any court having jurisdiction thereof;

              (iv)   Within 10 business days of receiving notice of an
arbitration award, together with certified copies of the arbitration award and
the judgment rendered thereon, unless restrained by court order, Escrow Agent
shall act according to the mandate of such arbitration award, without liability
to SI or SA.

              (v)  The prevailing party shall be entitled to receive its 
reasonable attorneys' fees in any such arbitration, and the non-prevailing 
party shall pay (or reimburse the prevailing party its portion of) the fees 
of the arbitrators, all as the arbitrators shall decide.  Any such award 
against SA shall be satisfied only out of the Indemnification Funds available 
for distribution to the Shareholders pursuant to Section 3.3, and not by SA 
individually acting in such role.



                                       6

<PAGE>

         4.8  To the extent deemed necessary by the Escrow Agent, all parties
to whom a distribution may be made shall have submitted to Escrow Agent a
properly completed current Form W-9 or Form W-8 or Escrow Agent shall make
appropriate withholdings.

         4.9  UNCLAIMED FUNDS AND INTEREST.  All interest earned on the Funds
shall become Indemnification Funds attributable to the shareholders as to which
Funds had been deposited under this Agreement in proportion to the amounts of
their respective deposits and shall be held and disbursed in the same manner as
other Indemnification Funds under this Agreement.  Any Funds that remain
unclaimed within six months after the Effective Time shall be similarly
allocated to the shareholders.

         4.10  DISBURSEMENT BY WIRE TRANSFER.  Parties hereto may elect to 
request transfer of funds by Fedwire from time to time, subject to the 
conditions stated herein.  Parties hereto agree that the wire transfer 
security procedures identified on the attached Exhibit A-4.10 to this 
agreement are commercially reasonable.  Parties hereto further agree that 
Escrow Agent should use these procedures to detect unauthorized wire transfer 
payment requests prior to executing such requests and further agree that any 
request acted upon by the Escrow Agent in compliance with these security 
procedures, whether or not authorized, shall be treated as an authorized 
request.  Parties hereto agree that the Escrow Agent has the right to change 
the wire transfer security procedures from time to time and that use of any 
changed procedures evidences the acceptance of the commercial reasonability 
of such change by the parties hereto.

    5.  TERM. This Agreement shall terminate upon the disbursement of all the 
Funds provided that the indemnification set forth in Section 10 shall survive 
termination of this Agreement.

    6.  INSPECTION OF RECORDS. SI or SA may, at any time, during normal 
business hours after reasonable notice to Escrow Agent, inspect the records 
of the Escrow Agent, insofar as they solely relate to this Agreement, for the 
purpose of determining compliance with and conformance to the provisions of 
this Agreement.

    7.  DUTY AND LIABILITY OF THE ESCROW AGENT.

         7.1  The duties and obligations of the Escrow Agent shall be limited 
to and determined solely by the express provisions of this Agreement and no 
implied duties or obligations shall be read into this Agreement against the 
Escrow Agent.  The sole duty of the Escrow Agent, other than as herein 
specified, shall be to receive the Funds and hold them, subject to release in 
accordance with the terms of this Agreement.

         7.2  SI and SA may from time to time prepare, execute and deliver to 
the Escrow Agent joint supplemental escrow instructions containing such terms 
and conditions not inconsistent with this Escrow Agreement as the Escrow 
Agent may reasonably require, which escrow instructions shall be binding upon 
the parties.



                                       7

<PAGE>


         7.3  The Escrow Agent shall not be responsible for or be required to 
enforce any of the terms or conditions of any agreement between SI and SA.

         7.4  The Escrow Agent shall not be responsible or liable in any manner
whatsoever for the performance or compliance of or by any party of their
respective obligations under this Agreement, nor shall the Escrow Agent be
responsible or liable in any manner whatsoever for the failure of any third
party to honor any of the provisions of this Agreement.

         7.5  The Escrow Agent is not bound by and is under no duty to 
inquire into the terms or validity of any other agreements or documents, 
including any agreements or documents which may be related to, referred to in 
or deposited with the Escrow Agent in connection with this Agreement.

         7.6  The Escrow Agent shall be entitled to rely upon and shall be 
protected in acting in reliance upon any instruction, notice, information, 
certificate, instrument, or other document which is submitted to it in 
connection with its duties under this Agreement and which the Escrow Agent in 
good faith believes to have been signed or presented by the proper party or 
parties. The Escrow Agent may assume that any person purporting to give any 
notice or make any statement in connection with the provisions hereof has 
been duly authorized to do so.  The Escrow Agent shall have no liability with 
respect to the form, execution, validity or authenticity thereof.

         7.7  The Escrow Agent shall not be liable for any act which the 
Escrow Agent may do or omit to do hereunder, or for any mistake of fact or 
law, or for any error of judgment, or for the misconduct of any employee, 
agent or attorney appointed by it, while acting in good faith, unless caused 
by or arising from its own gross negligence or willful misconduct.

         7.8  The Escrow Agent shall be entitled to consult with counsel of 
its own selection and the opinion of such counsel shall be full and complete 
authorization and protection to the Escrow Agent in respect of any action 
taken or omitted by the Escrow Agent hereunder in good faith and in 
accordance with the opinion of such counsel.

         7.9  So long as Escrow Agent acts consistent with its duties and 
liabilities specified in this Agreement, Escrow Agent shall not be 
responsible or liable for any losses resulting from the investment of the 
Funds or for obtaining any specific level or percentage of earnings on such 
investment.

         7.10 The Escrow Agent shall have no responsibility for the tax 
consequences of this Agreement.  The Escrow Agent hereby advises each party 
to this Agreement to consult with independent legal counsel concerning the 
tax ramifications of this transaction.

    8.   RESIGNATION AND TERMINATION OF ESCROW AGENT.  Escrow Agent may, upon 
providing fifteen (15) days' written notice, resign its position and 
terminate its liabilities and obligations hereunder.  In the event Escrow 
Agent is not notified within fifteen days of the 



                                       8
<PAGE>

Successor Escrow Agent, Escrow Agent shall be entitled to transfer all funds 
and assets to a court of competent jurisdiction with a request to have a 
successor appointed.  Upon filing such action and delivering such assets, 
Escrow Agent's obligations and responsibilities shall cease.  Similarly, SA & 
SI may also jointly terminate Escrow Agent and appoint a Successor Escrow 
Agent by providing fifteen (15) days written notice to Escrow Agent.

    9.   ESCROW AGENT'S FEE.  Escrow Agent shall be paid for services 
hereunder in accordance with the attached fee schedule and shall be 
reimbursed for its out of pocket expenses for fees of counsel in setting up 
the escrow.  Payments of all fees shall be the joint and several 
responsibility of SI and the Shareholders and may, to the extent of unpaid 
fees and expenses, be deducted from any property placed within the escrow 
with Escrow Agent.  In the event that Escrow Agent is made a party to 
litigation with respect to the property held hereunder, or brings an action 
in interpleader or in the event that the conditions of this escrow are not 
promptly fulfilled, or Escrow Agent is required to render any service not 
provided for in this agreement and fee schedule, or there is any assignment 
of the interest of this escrow or any modification hereof, Escrow Agent shall 
be entitled to reasonable compensation for such extraordinary services and 
reimbursement for all fees, costs, liability and expenses, including attorney 
fees.  The Escrow Agent may amend its fee schedule from time to time on 60 
days prior written notice to the parties.

         9.1  INDEMNIFICATION.

         9.2  SI agrees to indemnify and hold the Escrow Agent harmless from 
and against any and all liabilities, causes of action, claims, demands, 
judgments, damages, costs and expenses (including reasonable attorneys fees 
and expenses) whether foreseen or unforeseen, whether known or unknown, 
whether liquidated or unliquidated, that at any time may arise out of or in 
connection with the Escrow Agent's acceptance of or performance of its duties 
and obligations under this Agreement.

         9.3  The Escrow Agent shall be under no duty to institute any suit, 
or to take any remedial procedures under this Agreement, or to enter any 
appearance or in any way defend any suit in which it be made a defendant 
hereunder until it shall be indemnified as provided above.

    10.  DISPUTES WITH RESPECT TO INSTRUCTIONS.

         10.1 In the event that the instructions provided herein fail to 
address any unforeseen circumstance, resulting in ambiguity of the Agreement, 
or the Escrow Agent shall receive instructions with respect to the Funds 
which, in its discretion, are in conflict either with other instructions 
received by it or with any provision of this Agreement, the Escrow Agent 
shall continue to hold the Funds, until new instructions executed by SI and 
SA are delivered to the Escrow Agent, PROVIDED HOWEVER that the Escrow Agent 
may suspend further performance under this Agreement (except for the 
safekeeping of any Funds) until the resolution of such unforeseen 

                                       9

<PAGE>

circumstance to the Escrow Agent's sole satisfaction by final judgment of a 
court of competent jurisdiction or otherwise.

         10.2 In the event that any controversy arises between one or more of 
the parties hereto or any other party with respect to this Agreement, the 
Merger Agreement or the Funds, the Escrow Agent shall not be required to 
determine the proper resolution of such controversy or the proper disposition 
of the Funds and shall have the absolute right, in its discretion, to deposit 
the Funds with the Clerk of a court of competent jurisdiction, file suit and 
obtain an order from the court requiring all parties involved to litigate in 
such court their respective claims arising out of or in connection with the 
Funds.  Upon the deposit by the Escrow Agent of the Funds with the clerk of a 
court of competent jurisdiction in accordance with this provision, the Escrow 
Agent shall be relieved of all further obligations and released from all 
liability hereunder.

    11.  SA.

         11.1 SA is appointed the representative of the Shareholders pursuant 
to the Merger Agreement as their exclusive agent and attorney-in-fact on 
behalf of each of them in respect to all matters which are the subject of 
this Agreement, including, without limitation, (i) receiving or giving all 
notices, instructions, communications, consents or agreements that may be 
necessary, required or given under this Agreement and (ii) asserting, 
settling, compromising, defending or determining not to assert, settle, 
compromise or defend any claims that SI may assert or have the right to 
assert under this Agreement.  SA shall have unlimited authority and power to 
act on behalf of each Shareholder with respect to this Agreement and the 
disposition and other handling of all claims, rights or obligations under 
this Agreement so long as all Shareholders are treated in the same manner.  
The Shareholders shall be bound by all actions taken by SA in connection with 
this Agreement, and SI and Escrow Agent shall be entitled to rely on any 
action or decision of SA.  SA shall not be liable to any Shareholders for any 
act or failure to act, or for any mistake of fact or law, or for any error of 
judgment, or for the misconduct of any employee, agent or attorney appointed 
by SA, while acting in good faith, unless caused by SA's willful misconduct.  
The duties and obligations of SA shall be limited to and determined solely by 
the express provisions of this Agreement and no implied duties or obligations 
shall be read into this Agreement against SA.  SA shall be entitled to 
consult with counsel of SA's own selection and the opinion of such counsel 
shall be full and complete authorization and protection to SA in respect to 
any action taken or omitted by SA hereunder in good faith and in accordance 
with the opinion of such counsel.  Kurt Kosty and Stanley B. McDonald hereby 
accept such authorization and appointment.

         11.2 SUBSTITUTION.  Either Mr. Kosty or Mr. McDonald may resign as 
SA, effective upon a new SA appointed to act as SA by the written consent of 
Shareholders who hold at least a majority of the Percentage Shares (a 
"Majority Consent").  Such person who is acting as SA shall cease being the 
SA upon such person's death or disability, in such event the Shareholders 
shall appoint a substitute SA by Majority Consent.  In addition, a person may 
be substituted as SA by Majority Consent.  The term "SA" as used herein 
refers to Kurt Kosty and 

                                      10

<PAGE>

Stanley B. McDonald, acting together, or, if any person is substituted in 
accordance herewith as SA in place of either of them, to such persons acting 
together.  Upon written notice to Escrow Agent by the substitute SA, Escrow 
Agent shall be entitled to rely on the authority of the substitute SA to act 
as SA hereunder.

         11.3 SA shall not be entitled to receive any compensation for
performing SA's duties under this Agreement.  SA shall be reimbursed out of the
Escrowed Funds for any out-of-pocket costs and expenses reasonably incurred by
SA in connection with actions taken pursuant to the terms of this Agreement.

    12.  MISCELLANEOUS.

         12.1 NOTICE.  All notices, requests and other communications 
required or permitted under this Agreement shall be in writing and shall be 
deemed to have been duly given (i) when delivered by hand to a party; (ii) 
the next business day following facsimile transmission to the party to whom 
addressed (with evidence of receipt thereof) to the facsimile number shown 
below; or (iii) three business days after delivery into the United States 
mail, postage prepaid, as certified mail, return receipt requested, to the 
party to whom addressed at the address shown below:

         If to SI, to:

         SI Technologies, Inc.
         4611 South 134th Place
         Seattle, Washington 98168
         Attention: Rick Beets, President and CEO
         (206) 244-6100

         with a copy to

         Benjamin F. Stephens
         Graham & James LLP/Riddell Williams P.S.
         1001 4th Avenue Plaza, Suite 4500
         Seattle, Washington 98154-1065
         (206) 624-3600

         If to the Escrow Agent, to:

         First Trust National Association
         601 Union Street, Suite 2120
         Seattle, WA  98101
         Telephone:  (206) 461-4105
         Facsimile:  (206) 461-4175
         Attention:       Linda Houston

                                      11

<PAGE>

         If to the Shareholder Representative, to:

         Kurt Kosty
         c/o AeroGo, Inc.
         1170 Andover Park West
         Seattle, Washington 98188

         and

         Stanley B. McDonald
         520 Pike Street
         Seattle, Washington 98101

         With a copy to

         Wilbert C. Anderson
         Stoel Rives LLP
         600 University Street, Suite 3600
         Seattle, Washington 98101-3197

or such other address(es) or facsimile number(s) as any party may designate by
written notice given in accordance with this paragraph.

         12.2 SUCCESSORS AND ASSIGNS.  All the terms and conditions of this 
Agreement shall be binding upon, and inure to the benefit of and be 
enforceable by, the parties and their respective successors, assigns, heirs 
and legal representatives.  No person, firm or corporation will be recognized 
by Escrow Agent as a successor, heir or personal representative of any party  
until there shall be presented to Escrow Agent evidence reasonably 
satisfactory to it of such succession.

         12.3 ATTORNEYS' FEES.  If suit or action is filed by any party to 
enforce the provisions of this Agreement or otherwise with respect to the 
subject matter of this Agreement, the prevailing party shall be entitled to 
recover reasonable attorneys' fees as fixed by the trial court and, if any 
appeal is taken from any decision of the trial court, reasonable attorneys' 
fees as fixed by the appellate court.

         12.4 GOVERNING LAW.  The laws of the State of Washington shall 
govern the validity of this Agreement, the construction of its terms and the 
interpretation of the rights and duties of the parties.

         12.5 HEADINGS.  Section and other headings contained in this 
Agreement are for reference purposes only and shall not affect in any way the 
meaning or interpretation of this Agreement.

                                       12

<PAGE>

         12.6 GENDER.  All personal pronouns used in this Agreement shall 
include the other gender, whether used in the masculine, feminine or neuter 
gender, and the singular shall include the plural, and vice versa, whenever 
and as often as may be appropriate.

         12.7 SEVERABILITY.  Each provision of this Agreement is intended to 
be severable.  In the event that any one or more of the provisions contained 
in this Agreement shall for any reason be held to be invalid, illegal or 
unenforceable, the same shall not affect any other provisions of this 
Agreement, but this Agreement shall be construed as if such invalid, illegal 
or unenforceable provisions had never been contained in this Agreement.

         12.8 INTEGRATED AGREEMENT.  This Agreement and the Merger Agreement 
constitute the entire understanding and agreement among the parties  with 
respect to the subject matter of this Agreement, and there are no agreements, 
understandings, restrictions, representations or warranties among the parties 
other than those set forth or provided for in this Agreement and the Merger 
Agreement.

         12.9 BINDING AGREEMENT.  This Agreement shall be binding upon the 
assigns, successors, personal representatives and heirs of the parties, and 
shall be effective as of the day accepted by Escrow Agent.

         12.10 MERGER OR CONSOLIDATION.  Any company into which Escrow Agent 
may be merged or converted or with which it may be consolidated or any 
company resulting from any merger conversion or consolidation to which it 
shall be a party or any company to which Escrow Agent may sell or transfer 
all or substantially all of its corporate trust business, provided such 
company shall be a bank or trust company organized under the laws of any 
state of the United States of America or a national banking association and 
shall be authorized by law to perform all the duties imposed upon it by this 
Agreement, shall be the successor to Escrow Agent without the execution or 
filling of any paper or the performance of any further act.

         12.11 DISCLOSURE.  The parties hereto hereby agree not to use the 
name of FIRST TRUST NATIONAL ASSOCIATION to imply an association with the 
transaction other than that of a legal escrow agent.

         12.12 BROKERAGE CONFIRMATIONS.  The parties acknowledge that to the 
extent regulations of the Comptroller of Currency or other applicable 
regulatory entity grant a right to receive brokerage confirmations of 
security transactions of the escrow, the parties waive receipt of such 
confirmations, to the extent permitted by law.  The Escrow Agent shall 
furnish a statement of security transactions on its regular monthly reports.

                                       13

<PAGE>

    IN WITNESS WHEREOF, the parties have executed this Agreement as of the date
first above written.

AEROGO, INC., A WASHINGTON             FIRST TRUST NATIONAL
CORPORATION                            ASSOCIATION, AS ESCROW AGENT


By: RICK A. BEETS                      By:
   -------------------------------        --------------------------------

Its:  CHAIRMAN
   -------------------------------     Title:
                                            ------------------------------
KURT KOSTY                        
- ----------------------------------     By: 
Kurt Kosty                                 -------------------------------

                                       Title:
Stanley B. McDonald                        -------------------------------
- ----------------------------------
Stanley B. McDonald

SI TECHNOLOGIES, INC., A
DELAWARE CORPORATION


By:  RICK BEETS
   -------------------------------
      Rick Beets
Title:  President and Chief Executive
        Officer

                                       14




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