HEI INC
10QSB, 1996-07-15
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                   FORM 10-QSB


                                        
[X]  Quarterly Report under Section 13 or 15(d) of the Securities Exchange Act
     of 1934  
          For the quarterly period ended June 1, 1996  ("Third Quarter,
          Fiscal 1996") or

[ ]  Transition Report under Section 13 or 15(d) of the Securities Exchange Act
     of   1934
          For the transition period from ______________  to _______________


          Commission File Number 0-10078
          ------------------------------

                                    HEI, INC.
                                    ---------
        (Exact name of small business issuer as specified in its charter)


          Minnesota                                      41-0944876
          ---------                                      ----------
     (State or other jurisdiction of         (IRS Employer Identification No.)
     incorporation or organization)

          PO Box 5000, 1495 Steiger Lake Lane, Victoria, MN        55386
          -------------------------------------------------        -----
              (Address of principal executive offices)           (Zip Code)

          Issuer's Telephone number, including area code:  (612) 443-2500
                                                           --------------


                       None
                       ----
          Former name, former address and former 
          fiscal year, if changed since last report.


Check whether the issuer (1) filed all reports required to be filed by Section
13 or 15(d) of the Exchange Act during the past 12 months (or for such shorter
period that the registrant was required to file such reports); and (2) has been
subject to such filing requirements for the past 90 days.  Yes _X_ No ___

4,030,427 Common Shares, par value $0.05, were outstanding as of June 1, 1996.

This Form 10-QSB consists of 11 pages.


<PAGE>




                                                                           2

Table of Contents                                                  HEI, Inc.
- ----------------------------------------------------------------------------

          Part I - Financial Information


          Item 1.  Financial Statements

                    Balance Sheet...................................       3

                    Statement of Operations.........................       4

                    Statement of Cash Flows.........................       5
 
                    Notes to Financial Statements...................       6 - 7

          Item 2.   Management's Discussion and Analysis of
                    Financial Condition and Results of Operations...       8 - 9


          Part II - Other Information


          Item 6.   Exhibits and Reports on Form 8-K................       10

          Signatures................................................       11


<PAGE>


PART I - FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS                                                 3

HEI, INC. BALANCE SHEET
(DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
- -------------------------------------------------------------------------------


                                                  June 1, 1996  August 31, 1995
                                                  ------------  ---------------
  ASSETS                                           (Unaudited)                

  Current assets:
    Cash and cash equivalents                        $ 1,218        $ 1,438
    Short-term investments                             4,973          3,820
                                                     -------        -------
                                                       6,191          5,258
    Accounts receivable, net                           1,999          2,525
    Inventories                                        2,415          1,851
    Other, principally deferred tax assets               388            349
- -------------------------------------------------------------------------------
  Total current assets                                10,993          9,983
- -------------------------------------------------------------------------------

  Property and equipment:
    Land                                                 216            184
    Building and improvements                          3,061          1,398
    Fixtures and equipment                             7,335          5,475
    Accumulated depreciation and amortization         (4,802)        (4,183)
- -------------------------------------------------------------------------------
  Net property and equipment                           5,810          2,874

  Restricted cash                                      3,211              -
  Deferred financing costs                               102              -

- -------------------------------------------------------------------------------
  Total assets                                       $20,116        $12,857
- -------------------------------------------------------------------------------

  LIABILITIES AND SHAREHOLDERS' EQUITY

  Current liabilities:
    Current portion of long-term debt                $   303        $     -
    Accounts payable                                     484            385
    Accrued liabilities                                1,198          1,043
    Income taxes payable                                 123            175
- -------------------------------------------------------------------------------
  Total current liabilities                            2,108          1,603
- -------------------------------------------------------------------------------
  Long-term debt                                       5,322              -
  Deferred tax liability                                 272            272
- -------------------------------------------------------------------------------
  Shareholders' equity:
    Undesignated stock; 5,000,000 shares authorized,
      none issued
    Common stock, $.05 par; 10,000,000 shares                       
      authorized; 4,030,427 and 3,791,597 shares
      issued and outstanding                            202             190
    Paid-in capital                                   6,819           6,183
    Retained earnings                                 5,393           4,609
- -------------------------------------------------------------------------------
  Total shareholders' equity                         12,414          10,982
- -------------------------------------------------------------------------------
  Total liabilities and shareholders' equity        $20,116         $12,857
- -------------------------------------------------------------------------------

  See accompanying notes to unaudited financial statements.


<PAGE>

<TABLE>
<CAPTION>
  HEI, INC. STATEMENT OF OPERATIONS (UNAUDITED)                               4
  (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)                              
- ----------------------------------------------------------------------------------------
                                    Three Months Ended             Nine Months Ended
                                June 1, 1996   May 27, 1995   June 1, 1996  May 27, 1995
- ----------------------------------------------------------------------------------------
  <S>                           <C>            <C>            <C>           <C>
  Net sales                      $    4,656     $    6,134     $   14,283    $   18,005
  
  Cost of sales                       3,563          4,806         10,885        13,026
- ----------------------------------------------------------------------------------------
               
    Gross profit                      1,093          1,328          3,398         4,979
- ----------------------------------------------------------------------------------------

  Operating expenses:
  
    Selling, general
    and administrative                  578            608          1,736         1,842
    Research, development
    and engineering                     231            194            629           578

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

  Operating income                      284            526          1,033         2,559

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

  Other income, net                     (58)           (69)           (211)        (165)
                                                                                
- ----------------------------------------------------------------------------------------

  Income before income taxes            342            595           1,244        2,724

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

  Income taxes                          124            231             460          998

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

  Net income                     $      218     $      364     $       784   $    1,726

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

  Net income per common share    $      .05     $      .09     $       .19   $      .44

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

  Weighted average number of
  common and common equivalent
  shares outstanding              4,149,099      3,904,768       4,073,187    3,891,215

- ----------------------------------------------------------------------------------------
</TABLE>

 See accompanying notes to unaudited financial statements.


<PAGE>


 HEI, INC. STATEMENT OF CASH FLOWS (UNAUDITED)                               5
 (DOLLARS IN THOUSANDS)
 
 Nine months ended                                June 1, 1996   May 27, 1995
- -----------------------------------------------------------------------------
 CASH FLOW PROVIDED BY OPERATING ACTIVITIES:
   Net income                                        $   784         $1,726
   Depreciation and amortization                         620            565

- -----------------------------------------------------------------------------
 CHANGES IN CURRENT OPERATING ITEMS:
   Accounts receivable                                   526            530
   Inventories                                          (564)          (207)
   Other current assets                                  (39)            13
   Accounts payable                                       99            219
   Accrued liabilities                                   155            117
   Income taxes payable                                  (52)           (48)

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

   NET CASH FLOW PROVIDED BY OPERATING
   ACTIVITIES                                          1,529          2,915

- -----------------------------------------------------------------------------
 CASH FLOW PROVIDED BY (USED FOR) INVESTING ACTIVITIES:
   Purchase of short-term investments                 (4,313)        (4,817)
   Maturity of short-term investments                  3,160          2,296
   Additions to property and equipment                (3,556)          (559)
   Increase in restricted cash                        (3,211)             -
   Increase in deferred financing costs                 (102)             -

- -----------------------------------------------------------------------------
 NET CASH FLOW USED FOR INVESTING ACTIVITIES          (8,022)        (3,080)

- -----------------------------------------------------------------------------
 CASH FLOW PROVIDED BY (USED FOR) FINANCING ACTIVITIES:
   Proceeds from long-term debt                        5,625              -
   Principal payments for obligations under
   capital leases                                          -            (42)
   Issuance of common shares                             648            221

- -----------------------------------------------------------------------------
 NET CASH FLOW PROVIDED BY FINANCING
 ACTIVITIES                                            6,273            179

- -----------------------------------------------------------------------------
 NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS   (220)            14
 CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD        1,438          1,579

- -----------------------------------------------------------------------------
 CASH AND CASH EQUIVALENTS, END OF PERIOD             $1,218         $1,593

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

 See accompanying notes to unaudited financial statements.


<PAGE>


                                                                              6
NOTES TO FINANCIAL STATEMENTS (UNAUDITED)                        HEI,INC.
- --------------------------------------------------------------------------------
 
 (1) BASIS OF FINANCIAL STATEMENT PRESENTATION
  
  The unaudited financial statements have been prepared by the Company, under
  the rules and regulations of the Securities and Exchange Commission.  The
  accompanying financial statements contain all normal recurring adjustments
  which are, in the opinion of management, necessary for a fair presentation of
  such financial statements.
  
  Certain information and disclosures normally included in financial statements
  prepared in accordance with generally accepted accounting principles have
  been condensed or omitted under such rules and regulations although the
  Company believes that the disclosures are adequate to make the information
  presented not misleading.  The year-end balance sheet data were derived from
  audited financial statements, but do not include all disclosures required by
  generally accepted accounting principles. These unaudited financial
  statements should be read in conjunction with the financial statements and
  notes included in the Company's Annual Report to Shareholders on Form 10-KSB
  for the year ended August 31, 1995.  Interim results of operations for the
  three and nine month periods ended June 1, 1996 may not necessarily be
  indicative of the results to be expected for the full year.
  
  (2) INVENTORIES
  
  Inventories are stated at the lower of cost or market and include materials,
  labor and overhead costs.  The first-in, first-out cost method is used in
  valuing inventories.  Inventories consist of the following:
  
                                                         
   (Dollars in thousands)                     June 1, 1996   August 31,   1995
                                              ------------   -----------------
                                               (Unaudited)

        Purchased parts                             $1,897       $1,670
        Work in process                              1,254          907
        Finished goods                                 219          233
        Allowance for excess or obsolete stock        (955)        (959)
                                                    ------       ------
                                                    $2,415       $1,851
                                                    ------       ------
                                                    ------       ------

<PAGE>


                                                                              7
NOTES TO FINANCIAL STATEMENTS (UNAUDITED)
- -----------------------------------------

  (3) FINANCING ARRANGEMENTS
  
  In April 1996, the Company received proceeds of $5,625,000 from the issuance
  of industrial development revenue bonds.  Of these funds, approximately
  $1,500,000 will be or has been used for the construction of the new addition
  to the Company's manufacturing facility, and the remainder will be used for
  equipment purchases.  The bonds related to the facility expansion require
  annual principal payments of $95,000 on April 1 of each year through 2011. 
  The bonds related to the equipment require payments over seven years from the
  date of purchase of the equipment through April 1, 2006.  The bonds bear
  interest at a rate which varies weekly, and is limited to a maximum rate of
  10%.  The interest rate at June 1, 1996 was approximately 4%.  A revolving
  commitment fee is paid annually to the bank at a rate of 1% of the average
  daily unused revolving commitment.  The agreement contains certain
  restrictive covenants including limitations on other borrowings and
  maintenance of specified financial levels and ratios for net income, tangible
  net worth, debt to tangible net worth, cash flow and indebtedness.  The bonds
  are collateralized by two irrevocable letters of credit and property and
  equipment.  Restricted cash on the balance sheet represents advances under
  the bond held by the bond trustee in an interest bearing account and will be
  released to the Company over the next three years for construction and
  equipment purchases.
  
  Also in April 1996, the Company extended the due date of its $3,000,000
  revolving line of credit to April 1998.  At June 1, 1996 there were no
  borrowings outstanding under the line of credit.  Any borrowings under this
  agreement would be collateralized by accounts receivable.  The agreement
  contains certain restrictive covenants including limitations on other
  borrowings and maintenance of specified financial levels and ratios for net
  income, tangible net worth, debt to tangible net worth and cash flow. 
  Borrowings are limited to the lesser of $3,000,000 or the borrowing base,
  which is 80% of eligible accounts receivable.  Interest on the borrowings is,
  based at the Company's option, on the lender's prime rate of interest or at
  2% above the lender's LIBOR rate.   The prime rate of interest was 8.25% at
  June 1, 1996. 
  
<PAGE>
ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION          8
         AND RESULTS OF OPERATIONS                                  HEI, INC.
- -------------------------------------------------------------------------------

FINANCIAL CONDITION - LIQUIDITY AND CAPITAL RESOURCESA

The Company's net cash flow provided by operating activities was $1,529,000 
for the nine months ended June 1, 1996.  This included net income of 
$784,000, depreciation and amortization of $620,000, and a net decrease of 
$125,000 in current operating items for the first nine months of fiscal 1996. 
The decrease in current operating items principally included decreased 
accounts receivable of $526,000 and increased accrued liabilities of 
$155,000, partially offset by increased inventories of $564,000.

The inventory increase is primarily due to increased purchased parts and work 
in process for customer scheduled build requirements. 

Accounts receivable average days outstanding was 44 days at June 1, 1996 
compared to 43 days a year ago.  Inventory turns were 5.6 turns for the third 
quarter of fiscal 1996 compared to 9.6 turns for the same period a year ago. 
The reduced inventory turns are primarily due to lower shipments and 
increased inventory to meet customer scheduled build requirements.

Capital expenditures for the nine months ended June 1, 1996 were $3,556,000, 
primarily for the purchase of production equipment and the construction of a 
new addition to the Company's facility in Victoria, Minnesota.  The new 
addition, completed in June 1996, more than doubled the manufacturing floor 
space of the Company's microelectronics fabrication facility.  In connection 
with the construction, the Company has also been acquiring and integrating 
sophisticated new process equipment for the disk drive and other high volume 
continuous flow programs to be housed in the expanded space.  During the 
remainder of 1996, the Company intends to spend approximately $800,000 to 
complete the expansion, make additional manufacturing facility improvements, 
and purchase capital equipment, all of which are intended to increase the 
Company's manufacturing capacity in order to meet anticipated requirements 
for continued revenue growth. 

To finance the Company's expansion and its equipment needs over the next 
three years, in April 1996, the Company obtained $5,625,000 from the proceeds 
of industrial development revenue bonds issued by the City of Victoria, 
Minnesota. Of these funds, approximately $1.5 million dollars will be or has 
been used for the construction of the new addition and the remainder will be 
used for equipment purchases over the next three years.  The portion used for 
construction of the new facility will be repaid over 15 years.  The portion 
used to purchase equipment will be repaid over seven years from the date of 
purchase of the related equipment.  Repayment of the bonds is collateralized 
by two letters of credit and property and equipment of the Company.  The 
agreement contains certain restrictive covenants including limitations on 
other borrowings and maintenance of specified financial levels and ratios for 
net income, tangible net worth, debt to tangible net worth, cash flow and 
indebtedness.  The Company will pay an annual fee of 1% on the principal 
balance of the letters of credit.  The interest rate on the bonds is variable 
weekly, not to exceed 10% per annum.  The interest rate at June 1, 1996 was 
approximately 4%.  Proceeds from the bond issue are being held by a trustee 
in an interest bearing account for payment to the Company over the next three 
years as funds are used for construction or equipment purchases.  As of June 
1, 1996, the Company had drawn approximately $2,414,000 of bond proceeds to 
cover costs previously incurred in connection with the expansion.

During April 1996, the Company renewed its $3 million dollar revolving line 
of credit with a commercial bank.  Borrowings under this agreement are 
collateralized by accounts receivable.  The agreement contains certain 
restrictive covenants including limitations on other borrowings and 
maintenance of specified financial levels and ratios for net income, tangible 
net worth, debt to tangible net worth and cash flow.  Borrowings are limited 
to the lesser of $3,000,000 or the borrowing base, which is 80% of eligible 
accounts receivable.  Interest on the borrowings is, based on the Company's 
option, at the lender's prime rate of interest or 2% above the lender's LIBOR 
rate.  This line of credit expires in April 1998.  As of June 1, 1996, there 
were no borrowings under this line of credit. 


<PAGE>


                                                                              9
REVIEW OF OPERATIONS

NET SALES

1996 vs. 1995:  HEI, Inc's net sales for the three and nine month periods 
ended June 1, 1996 decreased 24% and 21%, respectively, compared to the same 
periods a year ago.  Microelectronic sales decreased 24% and 22%, 
respectively, from the same three and nine month periods last year as a 
result of reduced shipments in the high density disk drive business.  
However, the reduction in disk drive business shipments was partially offset 
by increased shipments to medical and hearing aid accounts.  As previously 
reported, shipments to a new disk drive account are expected to increase as 
that program enters production volumes.  In the fourth quarter of fiscal 
1996, the major new disk drive customer is expected to absorb much of the 
capacity made available after the previous largest account model phased out.  

GROSS PROFIT

1996 vs. 1995:  For the three and nine month periods ended June 1, 1996, 
gross profit decreased $235,000, or 18%, and $1,581,000, or 32%, 
respectively, from the same periods last year.  The gross profit rate 
increased to 23% from 22% for the three month period and decreased to 24% 
from 28% for the nine month period ended June 1, 1996 versus the same periods 
last year.  The gross profit rate decrease for the nine month period is 
primarily due to the effect of reduced volumes on manufacturing fixed costs, 
as well as the effect of lower margins on new business as the product mix 
evolves to a larger percentage of new programs bid under increasing price 
competition. 

OPERATING EXPENSES

1996 vs. 1995:  Operating expenses for the three and nine month periods ended 
June 1, 1996 were flat compared to last year's comparable periods.  Operating 
expenses were 17% of net sales for the three and nine month periods this year 
as compared to 13% for the three and nine month periods last year.  The 
increase in the percentage of operating expenses to net sales is primarily 
due to the effect of reduced volumes on fixed expenses.

INCOME TAXES

During each quarter of fiscal 1996, the Company is recording income tax 
expense based on the expected effective rate for the full year.  The expected 
effective income tax rate for fiscal 1996 is approximately 37%, the same rate 
as fiscal 1995.  Income tax expense for the three month and nine month 
periods of fiscal 1996 was $124,000 and $460,000, respectively, as compared 
to $231,000 and $998,000, respectively, for the same periods a year ago.   

NET INCOME

1996 vs. 1995:  The Company had net income of $218,000 for the third quarter 
of fiscal 1996 compared to $364,000 for the same period a year ago.  The 
Company had net income of $784,000 for the nine months ended June 1, 1996 
compared to $1,726,000 for the same period a year ago.  The decrease in net 
income principally was the result of reduced sales and reduced operating 
income.  


<PAGE>


                                                                             10
PART II - OTHER INFORMATION
- -------------------------------------------------------------------------------

ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K

  a) Exhibits

       4.1a Credit Agreement with Norwest Bank Minnesota, N.A. dated April 1, 
            1996.

       4.1b Current Note and Security Agreement with Norwest Bank Minnesota, 
            N.A. dated April 1, 1996.

       4.2a Reimbursement Agreement by and between HEI, Inc. and Norwest Bank 
            Minnesota, National Association dated as of April 1, 1996.

       4.2b Mortgage Security Agreement Fixture Financing Statement and 
            Assignment of Leases and Rents by HEI, Inc. as Mortgagor to 
            Norwest Bank Minnesota, National Association as Mortgagee dated 
            April 1, 1996.

       4.2c Security Agreement by HEI, Inc. in favor of Norwest Bank 
            Minnesota, National Association dated April 1, 1996.


       27 Financial Data Schedule


  b) Reports on Form 8-K

       No Reports on Form 8-K were filed during the quarter ended June 1, 1996.


<PAGE>


                                                                             11
SIGNATURES

In accordance with the requirements of the Exchange Act, the registrant 
caused this report to be signed on its behalf by the undersigned, thereunto 
duly authorized.

                                    HEI, INC.

                                    (Registrant)

Date:   JULY 10, 1996                /s/ Jerald H. Mortenson
     -------------------------      -------------------------
                                    Jerald H. Mortenson
                                    Vice President of Finance and 
                                    Administration, Chief Financial Officer 
                                    and Treasurer
                                    (a duly authorized officer)



<PAGE>

                               CREDIT AGREEMENT                    Exhibit 4.1a

     THIS CREDIT AGREEMENT is dated as of the ___ day of April, 1996, and is 
by and between HEI, INC., a Minnesota corporation with offices located in 
Victoria, Minnesota (the "Borrower"), and NORWEST BANK MINNESOTA, NATIONAL 
ASSOCIATION, a national banking association with offices located in Wayzata, 
Minnesota (the "Bank").

                                   RECITALS:

     WHEREAS, the Borrower has requested the Lender to extend a revolving 
credit line in the principal amount of THREE MILLION AND NO/100 DOLLARS 
($3,000,000.00) (the "Credit") for working capital purposes; and,

     WHEREAS, the Bank is willing to make the Credit available to the 
Borrower subject to the provisions of this Credit Agreement;

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

     SECTION 1  DEFINITIONS

1.1  In addition to those terms defined in the above recitals, as used herein:

     "Acceptable Accounts Receivable" shall mean Borrower's accounts 
receivable which are: (i) less than ninety (90) days in age; (ii) not part of 
an account, ten percent (10.0%) or more of which is ninety (90) days past 
due; (iii) not subject to offset or dispute; (iv) not due from the U.S. 
Government, foreign entities (not supported by letters of credit), 
Subsidiaries or affiliates of the Borrower; and (v) not representing booked 
but unfilled orders.

NEED TO ADD FOREIGN ACCOUNTS AS REFLECTED ON EXHIBIT A ATTACHED.

     "Agreement" shall mean this Credit Agreement and all amendments and 
supplements hereto which may from time to time become effective hereafter in 
accordance with the terms hereof.

     "Banking Day" shall mean a day on which banks are generally open for 
business in Wayzata, Minnesota. 

     "Base Rate" shall mean the "base" or "prime" rate of interest as 
announced by Norwest Bank Minnesota, National Association, at its principal 
office located in Minneapolis, Minnesota, as in effect from time to time.

     "Borrowed Money" shall mean funds obtained by incurring contractual 
indebtedness and shall not include trade accounts payable or money borrowed 
from the Bank.


<PAGE>


     "Borrowing Base" shall mean 80% of Acceptable Accounts Receivable.

NEED TO ADD 65% OF ACCEPTABLE FOREIGN AS PER EXHIBIT A. 

     "Borrowing Base Certificate" shall mean a schedule of Borrower's 
accounts receivable and Acceptable Accounts Receivable, which certificate is 
prepared and furnished to Bank pursuant to Sections 2.1 and 3.2(C), and which 
is executed by an authorized officer of Borrower.

     "Closing Date" shall mean the date on which funds are advanced under the 
Credit.

     "Credit" shall mean the conditional revolving credit line established 
hereby, which shall not in any event exceed the aggregate principal amount of 
THREE MILLION AND NO/100 DOLLARS ($3,000,000.00) outstanding at any one time.

     "Current Note" shall mean the promissory note of the Borrower 
substantially in the form of attached Exhibit B, evidencing borrowings under 
Section 2.1 hereof.

     "Events of Default" shall mean any and all events of default described 
in Section 8 hereof.

     "Indebtedness" shall mean, as to the Borrower, or any Subsidiary, all 
items of indebtedness, obligation or liability, whether matured or unmatured, 
liquidated or unliquidated, direct or contingent, joint or several.

     "Interest Period" shall mean, relative to any LIBOR Rate election, the 
period which shall begin on (and include) the date on which such election is 
effective or continued as and, unless the maturity of the Note is 
accelerated, shall end on (but exclude) the day which is 30, 60 or 90 days 
thereafter, provided, however, that:

          A.   If such Interest Period would otherwise end on a day which is not
     a Banking Day, such Interest Period shall end on the next following
     business day; or 

          B.   The Borrower may not select, and there shall not be applicable,
     any Interest Period that would end later than the Maturity Date.  

     "LIBOR Rate" shall mean the average rate per annum (rounded up to the 
nearest one-sixteenth of one percent) of which U.S. Dollar deposits are 
offered to Norwest in the London Interbank Market with a term equal to the 
applicable Interest Period, in an amount equal to the outstanding principal 
balance of the Current Note.  

     "Maturity Date" shall mean March                 , 1998.  

     "Permitted Liens" shall mean:

          A.   Liens in favor of the Bank;


                                      -2-

<PAGE>


          B.   Existing liens disclosed to the Bank in writing prior to the date
     of this Agreement; 

          C.   Liens for taxes not delinquent or which Borrower is contesting in
     good faith; and

          D.   Purchase money liens.

     "Security Agreement" shall mean the security agreement substantially in 
the form of attached Exhibit C, pursuant to which, among other things, 
Borrower grants Bank a security interest in the accounts receivable of the 
Borrower.

     "Subsidiary" shall mean any corporation of which more than fifty percent 
(50%) of the outstanding voting securities shall, at the time of 
determination, be owned directly, or indirectly through one or more 
intermediaries, by the Borrower.

     "Tangible Net Worth" shall mean the sum of the par or stated value of 
all outstanding capital stock, surplus and undivided profits of the Borrower, 
less any amounts attributable to treasury stock, good will, patents, 
copyrights, mailing lists, catalogues, trademarks, bond discount and 
underwriting expenses, organization expenses, leasehold improvements and 
loans to officers or employees and other like intangibles (not including 
prepaid expenses classified as current assets or intangible assets offset by 
equal related liabilities), excluding also Subchapter S earnings unless such 
earnings are converted to notes and subordinated to bank debt or the Bank is 
given written confirmation, in form acceptable to the Bank, that such 
earnings are being retained as equity capital, all as determined in 
accordance with generally accepted accounting principles.

1.2  COMPUTATION OF TIME PERIODS.  In this Agreement in the computation of 
periods of time from a specified date to a later specified date, the word 
"from" means "from and including" and the words "to" and "until" each means 
"to but excluding."

1.3  ACCOUNTING TERMS.  All accounting terms not specifically defined herein 
shall be construed in accordance with generally accepted accounting 
principles consistent with those applied in the preparation of the financial 
statements referred to in Section 5.6.

     SECTION 2  THE LOAN 

2.1  CREDIT.  Subject to the other provisions of this Agreement, the Bank 
agrees to lend to the Borrower from time to time from the effective date 
hereof until the Maturity Date sums not to exceed the lesser of the Borrowing 
Base or THREE MILLION AND NO/100 DOLLARS ($3,000.000) in aggregate principal 
amount at any one time outstanding.  Each borrowing under this Section 2.1 
will be requested in writing or in person by an authorized officer of the 
Borrower, or telephonically by any person reasonably believed by the Bank to 
be an authorized officer of the Borrower.  Each borrowing under this Section 
2.1 will be evidenced by a notation on the Bank's records, which shall be 
conclusive evidence of such borrowing, and by the Current Note.  The officer 
making the request must present the Bank with its most current 


                                      -3-


<PAGE>


Borrowing Base Certificate.  Within the limits of the Credit and subject to 
the terms and conditions hereof, the Borrower may borrow, prepay pursuant to 
Section 2.6 hereof and reborrow pursuant to this Section 2.1.

2.2  INTEREST RATE:  Upon two business days prior notice (before the end of 
the applicable Interest Period for a prior LIBOR Rate election) Borrower may 
elect or convert all or a portion of its outstanding balance under the Credit 
to one of the following interest rates:

          A.   Base Rate Option.  Interest on the unpaid principal of the
     Current Note shall be calculated at an annual rate equal to the Base Rate
     in effect from time, to time, which rate shall change as and when the Base
     Rate changes, on the basis of the actual number of days elapsed in a year
     of 360 days, and shall change as and when the Base Rate changes.

          B.   LIBOR Rate Option.  Subject to the terms and conditions of this
     Agreement, the Borrower may elect that the principal balance outstanding
     under the Current Note in increments of $100,000.00 bear interest at an
     annual rate equal to two hundred (200) basis points (2.0%) in excess of the
     LIBOR Rate as determined as of approximately 11:00 A. M., London time, two
     business days before the beginning of the Interest Period selected by the
     Borrower.  

If two business days prior to the end of an Interest Period, Borrower does 
not elect a new interest rate option, then the Base Rate Option shall apply. 

2.3  INTEREST PAYMENT.  Interest on the Current Note shall be payable 
monthly, commencing March ____, 1996, and continuing on the same day of each 
succeeding month until the Current Note is paid; provided, however, if a 
LIBOR Rate Option has been selected, then interest shall be due and payable 
at the end of each Interest Period.

2.4  PRINCIPAL REPAYMENT.  The principal of the Current Note shall be 
repayable on the Maturity Date.

2.5  PAYDOWN.  Notwithstanding Section 2.4 above, the Borrower shall maintain 
a $0.00 outstanding principal balance under the Credit for a period of at 
least sixty (60) consecutive days in Borrower's fiscal year ending August 31, 
1995 and for a period of thirty (30) consecutive days for Borrower's fiscal 
year ending August 31, 1996.

2.6  PREPAYMENT.  The Borrower may at any time prepay the Current Note in 
whole or from time to time in part without premium or penalty.

2.7  MANDATORY PREPAYMENT.  The Borrower shall be required to make 
prepayments of amounts due under the Current Note at any time the aggregate 
amount of borrowing outstanding is found to exceed the Borrowing Base.  Such 
required prepayments shall be in an amount equal to the difference between 
borrowings outstanding and the Borrower Base.

2.8  SUMS PAYABLE.  All sums payable to the Bank hereunder shall be paid 
directly to the Bank in immediately available funds.  The Bank shall send the 
Borrower statements of all 


                                      -4-


<PAGE>


amounts due hereunder, which statements shall be considered correct and 
conclusively binding on the Borrower unless the Borrower notifies the Bank to 
the contrary within thirty days of its receipt of any statement which it 
deems to be incorrect.  Alternatively, at its sole discretion, the Bank may 
charge against any deposit account of the Borrower all or any part of any 
amount due hereunder.

     SECTION 3  CONDITIONS PRECEDENT

3.1  The Borrower shall deliver the following to the Bank on or before the 
Closing Date:

          A.   The Current Note, duly executed by Borrower.

          B.   The Security Agreement, duly executed by Borrower

3.2  The Bank shall not be obligated to lend hereunder on the occasion for 
any borrowing unless:

          A.   The representations and warranties contained in Section 5 hereof
     are true and accurate on and as of such date;

          B.   No Event of Default, and no event which might become an Event of
     Default after the lapse of time or the giving of notice and the lapse of
     time, has occurred and is continuing or will exist upon the disbursement of
     such loan; and,

          C.   The Borrower shall have delivered to the Bank a Borrowing Base
     Certificate as provided in Section 2.1 hereof, and a certification by an
     appropriate officer of the Borrower as to the matters set forth in Sections
     3.2(A) and 3.2(B) hereof.

     SECTION 4  SECURITY

4.1  SECURITY INTEREST.  To secure the Current Note and the performance of 
its additional obligations as set forth hereunder, the Borrower has executed 
and delivered to the Bank before the Closing Date the financing statements, 
in form and substance satisfactory to the Bank, granting to the Bank a first 
security interest in accounts receivable, now owned or hereafter acquired.

4.2  DEPOSIT ACCOUNTS.  As additional security for the prompt satisfaction of 
all obligations of Borrower under the Current Note and Security Agreement, 
the Borrower hereby assigns, transfers and sets over to the Bank all of its 
right, title and interest in and to, and grants the Bank a lien on and a 
security interest in, all amounts that may be owing from time to time by the 
Bank to the Borrower in any capacity, including, but without limitation, any 
balance or share belonging to the Borrower, of any deposit or other account 
with the Bank, which lien and security interest shall be independent of any 
right of set-off which the Bank may have.

4.3  COLLATERAL.  The property in which a security interest is granted 
pursuant to the provisions of Sections 4.1 and 4.2 is herein collectively 
called the "Collateral".  The Collateral, together with all of the Borrower's 
other property of any kind held by the Bank, 


                                      -5-


<PAGE>


shall stand as one general, continuing collateral security for all 
Indebtedness to the Bank and may be retained by the Bank until all 
Indebtedness has been paid in full.  ( Needs to be revised.  Line of Credit 
and Direct Payment Letter of Credit and not cross collateralized. They are 
cross defaulted ???).

New agreement calls for a negative on pledge on inventory.  

4.4  ADDITIONAL DOCUMENTS.  At any time requested by the Bank, the Borrower 
shall execute and deliver or cause to be executed and delivered to the Bank 
such additional documents as the Bank may consider to be necessary or 
desirable to evidence or perfect the security interests referred to in 
Section 4.1 hereof.

4.5  LIENS.  The foregoing liens shall be first and prior liens except for 
Permitted Liens.

     SECTION 5  REPRESENTATIONS AND WARRANTIES

     To induce the Bank to enter into this Agreement, the Borrower represents 
and warrants to the Bank as follows:

5.1  CORPORATE STATUS.  The Borrower is a corporation duly organized, 
existing and in good standing under the laws of the State of Minnesota.  

5.2  AUTHORITY.  The execution, delivery and performance of this Agreement, 
the Current Note and Security Agreement by the Borrower are within its 
corporate powers, have been duly authorized, and are not in contravention of 
law, or the terms of Borrower's Articles of Incorporation or By-Laws or of 
any undertaking to which the Borrower is a party or by which it is bound.

5.3  CONSENT.  No consent, approval or authorization of or declaration or 
filing with any governmental authority on the part of the Borrower is 
required in connection with the execution and delivery of this Agreement or 
the borrowings by the Borrower hereunder or on the part of the Borrower in 
connection with the consummation of any transaction contemplated hereby.

5.4  LIENS.  The property of the Borrower is not subject to any lien except 
Permitted Liens.

5.5  LITIGATION.  No litigation or governmental proceeding is pending or, to 
the knowledge of the officers of the Borrower, threatened against the 
Borrower which could have a material adverse effect on the Borrower's 
financial condition or business.

5.6  FINANCIAL STATEMENTS.  All financial statements delivered to Bank by or 
on behalf of Borrower, including any schedules and notes pertaining thereto, 
have been prepared in accordance with generally accepted accounting 
principles consistently applied, and fully and fairly present the financial 
condition of the Borrower at the dates thereof and the results of operations 
for the periods covered thereby, and there have been no material adverse 
changes in 


                                      -6-

<PAGE>


the consolidated financial condition or business of the Borrower from 
November 30, 1995 to the date hereof.

5.7  LICENSES.  The Borrower possesses adequate licenses, permits, 
franchises, patents, copyrights, trademarks and trade names, or rights 
thereto, to conduct its business substantially as now conducted and as 
presently proposed to be conducted.

5.8  ERISA.  The Borrower does not have any unfunded liabilities in any 
pension plan, as such terms is defined in the Employee Retirement Income 
Security Act of 1974, as amended, and any successor statute of similar import 
("ERISA"), together with the regulations thereunder.  As used in this 
section, "unfunded liabilities" means with regard to any plan, the excess of 
the current value of the plan's benefits guaranteed under ERISA over the 
current value of the plan's assets allocable to such benefits.

5.9  ENVIRONMENTAL.  The Borrower has obtained all permits, licenses and 
other authorizations which are required under federal, state and/or local 
laws ("Environmental Laws") relating to pollution or protection of the 
environment, including laws relating to emissions, discharges, releases or 
threatened releases of pollutants, contaminants, hazardous or toxic materials 
or wastes into ambient air, surface water, ground water or land, or otherwise 
relating to the manufacture, processing, distribution, use, treatment, 
storage, disposal, transport or handling of pollutants, contaminants or 
hazardous or toxic materials or wastes ("Environmental Matters").  The 
Borrower is in compliance in all material respects with all terms and 
conditions of such required permits, licenses and authorizations is are also 
in full compliance with all other limitations, restrictions, conditions, 
standards, prohibitions, requirements, obligations, schedules and timetables 
contained in the Environmental Laws or contained in any plan, order, decree, 
judgment or notice.  The Borrower is not aware of, nor has the Borrower 
received notice of, any events, conditions, circumstances, activities, 
practices, incidents, actions or plans which may interfere with or prevent 
continued compliance or which may give rise to any liability under any 
Environmental Laws or the common law.  The Borrower has not received any 
summons, citation, directive, letter or other communication, written or oral, 
from any agency or department of any state, federal or local government 
relating to any Environmental Matters or any alleged Environmental Matters.  
No investigation, administrative order, consent order and agreement, 
litigation or settlement with respect to any Environmental Matters or any 
alleged Environmental Matters has been received by the Borrower or is 
proposed, threatened, anticipated or in existence with respect to the 
Borrower.

5.10 VALIDITY.  This Agreement is, and the Notes when issued will be, valid 
and binding in accordance with their terms.

5.11 GOOD STANDING.  The Borrower is duly qualified to do business and is in 
good standing in any additional jurisdictions where, on advice of legal 
counsel, registration was deemed necessary.

5.12 DEFAULT.  The Borrower is not in default of a material provision under 
any material agreement, instrument, decree or order to which it is a party or 
by which it or its property is bound or affected.


                                      -7-

<PAGE>


     SECTION 6  AFFIRMATIVE COVENANTS

     The Borrower covenants and agrees that so long as any indebtedness 
remains outstanding hereunder, unless the Bank shall otherwise consent in 
writing, it will:

6.1  TAXES.  Pay, when due, all taxes assessed against it or its property 
except to the extent and so long as contested in good faith.

6.2  CORPORATE EXISTENCE.  Maintain its corporate existence and comply with 
all laws and regulations applicable thereto.

6.3  REPORTS.  Furnish to the Bank:

          A.   Within 90 days after the end of each fiscal year of the Borrower
     a detailed report of audit of the Borrower for such fiscal year including
     the balance sheet of the Borrower as of the end of such fiscal year and the
     statements of profit and loss and surplus of the Borrower for the fiscal
     year then ended, prepared by independent certified public accountants
     satisfactory to the Bank.

          B.   Within 30 days after the end of each quarter, or month if there
     are outstanding borrowings under the Credit, (i) the balance sheet of the
     Borrower as of the end of such month, (ii) the statement of profit and loss
     and surplus of the Borrower from the beginning of such fiscal year to the
     end of such month, (iii) an aged listing of Borrower's accounts receivable,
     and (iv) a Borrowing Base Certificate current through the end of the
     previous month, all in a form acceptable to Bank.  All of the foregoing
     shall be unaudited, but certified as correct (subject to year end
     adjustments) by an appropriate officer of the Borrower.

          C.   No later than 30 days prior to the beginning of each fiscal year,
     projected financial statements in form acceptable to the Bank.

          D.   Promptly upon knowledge thereof, notice to the Bank in writing of
     the occurrence of any event which has or might, after the lapse of time or
     the giving of notice and the lapse of time, become an Event of Default.

          E.   Promptly, such other information as the Bank may reasonably
       request.

6.4  MAINTENANCE OF PROPERTY.  Maintain its inventory, equipment, real estate 
and other properties in good condition and repair (normal wear and tear 
excepted), and pay and discharge or cause to be paid and discharged when due, 
the cost of repairs to or maintenance of the same, and pay or cause to be 
paid all rental or mortgage payments due on such real estate.

6.5  INSURANCE.  Cause its properties of an insurable nature to be adequately 
insured by reputable and solvent insurance companies against loss or damages 
customarily insured against 


                                      -8-


<PAGE>


by persons operating similar properties, and similarly situated, and carry 
such other insurance as usually carried by persons engaged in the same or 
similar businesses and similarly situated.

6.6  RECORDS.  Keep true, complete and accurate books, records and accounts 
in accordance with generally accepted accounting principles consistently 
applied.

6.7  INSPECTION.  Permit any of Bank's duly authorized employees or agents 
the right, at any reasonable time and from time to time, to visit and inspect 
the properties of Borrower and to examine and take abstracts from its books 
and records.

6.8  COMPLIANCE.  Continue to conduct the same general type of business as is 
now being carried on in compliance with all applicable statutes, laws, rules 
and regulations.

6.9  COLLATERAL AUDITS.  Permit the Bank, at its discretion, to conduct 
annual collateral audits, the cost for which Borrower shall reimburse the 
Bank up to a maximum of $1,000.00 per audit.

6.10 PRIMARY DEPOSITORY.  Maintain its primary deposit accounts with the Bank.

     SECTION 7  NEGATIVE COVENANTS

     Without the Bank's written consent, so long as any indebtedness remains 
outstanding under the Credit, the Borrower will not:

7.1  LIENS.  Permit any lien including, without limitation, any pledge, 
assignment, mortgage, title retaining contract or other type of security 
interest to exist on its property, real or personal, except Permitted Liens.

7.2  MERGER.  Enter into any transaction of merger or consolidation, or 
transfer, sell, assign, lease or otherwise dispose of (other than sales in 
the ordinary course of business) all or a substantial part of its properties 
or assets, or any of its notes or accounts receivable, or any stock (other 
than directors qualifying shares) or any assets or properties necessary or 
desirable for the proper conduct of its business, or change the nature of its 
business, or wind up, liquidate or dissolve, or agree to do any of the 
foregoing.

7.3  BORROWED MONEY.  Create, incur, assume or suffer to exist, contingently 
or otherwise, indebtedness for Borrowed Money, except indebtedness disclosed 
to the Bank in writing as existing at the time of execution of this Agreement.

7.4  GUARANTEE.  Become or remain a guarantor or surety, or pledge its credit 
or become liable in any manner (except by endorsement for deposit in the 
ordinary course of business) on undertakings of another.

7.5  ACQUISITIONS.  Purchase or otherwise acquire all or substantially all of 
the assets of any person, firm, corporation or other entity.


                                      -9-

<PAGE>


7.6  MINIMUM TANGIBLE NET WORTH.  Permit its Tangible Net Worth to be less 
than $12,400,000.00 for its fiscal year ending August 31, 1996, and 
$13,900,000.00 for its fiscal year ending  August 31, 1997. 

7.7  DEBT RATIO.  Permit its long-term debt to Tangible Net Worth ratio to 
exceed 1.0 to 1.0 

     SHOULD NOW READ "AT ALL TIMES" 

as of Borrower's fiscal year ending August 31, 1995, and for fiscal year 
ending August 31, 1996 at such revised level as may be established by the 
Bank based upon the projections delivered pursuant to Section 6.3(D).

7.8  MINIMUM NET PROFIT.  Fail to produce a net profit after taxes quarterly 
and of at least $1,000,000.00 as of Borrower's fiscal years ending August 31, 
1996 and August 31, 1997.

7.9  ACCOUNTING.  Make a material change in its accounting procedures, 
whether for tax purposes or otherwise, including, but not limited to, making 
a Subchapter S election under the United States Internal Revenue Code.

     SECTION 8  EVENTS OF DEFAULT

8.1  Upon the occurrence of any of the following Events of Default:

          A.   PAYMENT.  Default in any payment of interest or of principal on
     the Current Note when due, and continuance thereof for 10 calendar days;

          B.   PERFORMANCE.  Default in the observance or performance of any
     other agreement of the Borrower set forth herein or in the Security
     Agreement and continuance thereof for 30 days;

          C.   BORROWED MONEY.  Default by the Borrower in the payment of any
     other indebtedness for Borrowed Money or in the observance or performance
     of any term, covenant or agreement of the Borrower in any agreement
     relating to any indebtedness of the Borrower, the effect of which default
     is to permit the holder of such indebtedness to declare the same due prior
     to the date fixed for its payment under the terms thereof;

          D.   REPRESENTATIONS.  Any representation or warranty made by the
     Borrower herein, or in any statement or certificate furnished by the
     Borrower hereunder, is untrue in any material respect; or 

          E.   LITIGATION.  The occurrence of any litigation or governmental
     proceeding which is pending or threatened against the Borrower, which could
     have a material adverse effect on the Borrower's financial condition or
     business, and which is not remedied within a reasonable period of time (a
     reasonable period of time not to exceed 30 days) after notice thereof to
     the Borrower; 


                                     -10-

<PAGE>


then, or at any time thereafter, unless such Event of Default is remedied, 
the Bank or the holder of the Current Note may, by notice in writing to the 
Borrower, terminate the Credit or declare the Current Note to be due and 
payable, or both, whereupon the Credit shall terminate forthwith or the 
Current Note shall immediately become due and payable, or both, as the case 
may be.

8.2  Upon the occurrence of any of the following Events of Default:

     BANKRUPTCY.  The Borrower becomes insolvent or bankrupt, or makes an
     appointment for the benefit of creditors or consents to the appointment of
     a custodian, trustee or receiver for itself or for the greater part of its
     properties; or a custodian, trustee or receiver is appointed for the
     Borrower, or for the greater part of its properties without its consent and
     is not discharged within 60 days; or bankruptcy, reorganization or
     liquidation proceedings are instituted by or against the Borrower and, if
     instituted against it, are consented to by it or remain undismissed for 60
     days;

then the Credit shall automatically terminate and the Current Note shall 
automatically become immediately due and payable, without notice.

     SECTION 9  MISCELLANEOUS

9.1  OTHER AGREEMENTS.  The provisions of this Agreement shall be in addition 
to those of any guaranty, pledge or security agreement, note or other 
evidence of liability held by the Bank, all of which shall be construed as 
complementary to each other.  Nothing herein contained shall prevent the Bank 
from enforcing any or all other notes, guaranties, pledges or security 
agreements in accordance with their respective terms.  (??? Should anythng 
specific be said about the IDRB Direct Pay LC's ???).

9.2  WAIVER.  The Bank shall have the right at all times to enforce the 
provisions of this Agreement and the Collateral Documents in strict 
accordance with the terms hereof and thereof, notwithstanding any conduct or 
custom on the part of the Bank in refraining from so doing at any time or 
times.  The failure of the Bank at any time or times to enforce its rights 
under such provisions, strictly in accordance with the same, shall not be 
construed as having created a custom in any way or manner contrary to 
specific provisions of this Agreement or as having in any way or manner 
modified or waived the same.  All rights and remedies of the Bank are 
cumulative and concurrent and the exercise of one right or remedy shall not 
be deemed a waiver or release of any other right or remedy.

9.3  EXPENSES.  The Borrower will pay all expenses, including the reasonable 
fees and expenses of legal counsel for the Bank, incurred in connection with 
the administration, amendment, modification or enforcement of this Agreement 
and the Security Agreement, and the collection or attempted collection of the 
Current Note.

9.4  NOTICES.  Any notices or consents required or permitted by this 
Agreement shall be in writing and shall be deemed delivered if delivered in 
person or if sent by certified mail, postage prepaid, return receipt 
requested, or telegraph, as follows, unless such address is changed by 
written notice hereunder:


                                     -11-

<PAGE>


          A.   If to the Borrower:

               HEI, INC.
               1495 Steiger Lake Lane
               Victoria, Minnesota 55386

               Attention:  Jerald H. Mortenson

          B.   If to the Bank:

               Norwest Bank Minnesota, National Association
               900 East Wayzata Boulevard
               Wayzata, Minnesota 55391

               Attention:  Judy Wenderoth

9.5  STATE LAW.  The substantive Laws of the State of Minnesota shall govern 
the construction of this Agreement and the rights and remedies of the parties 
hereto.

9.6  SUCCESSORS.  This Agreement shall inure to the benefit of, and shall be 
binding upon, the respective successors and permitted assigns of the parties 
hereto.  The Borrower has no right to assign any of its rights or obligations 
hereunder without the prior written consent of the Bank.  This Agreement, and 
the documents executed and delivered pursuant hereto, constitute the entire 
agreement between the parties, and may be amended only by a writing signed on 
behalf of each party.

9.7  VALIDITY.  If any provision of this Agreement shall be held invalid 
under any applicable Laws, such invalidity shall not affect any other 
provision of this Agreement that can be given effect without the invalid 
provision, and, to this end, the provisions hereof are severable.

9.8  BANKING DAY.  Whenever any installment of the interest on the Notes 
becomes due and payable on a day which is not a Banking Day, the maturity or 
due date thereof shall be extended to the next succeeding Banking Day and, in 
the case of principal of the Notes, interest shall be payable thereon at the 
rate per annum specified in the Notes during such extension.

     IN WITNESS WHEREOF, the parties hereto have duly executed this Agreement 
as of the day and year first above written.

HEI, INC.


By:                                    By:
   ---------------------------------       ---------------------------------

Its:                                   Its:
    --------------------------------       ---------------------------------


                                     -12-

<PAGE>


NORWEST BANK MINNESOTA, 
  NATIONAL ASSOCIATION

By:
   ---------------------------------

Its:
    --------------------------------


                                     -13-




<PAGE>

                                 CURRENT NOTE                      Exhibit 4.1b



$3,000,000.00                                                           , 1996
                                                        -----------------



         On April __, 1998, for value received, HEI, Inc. (the "Borrower")
promises to pay to the order of Norwest Bank Minnesota, National Association
(the "Bank") at its office in Wayzata, Minnesota or at any other place
designated at any time by the holder hereof, in lawful money of the United
States of America, the principal sum of Three Million and no/100 Dollars
($3,000,000.00), or so much thereof as is disbursed and remains outstanding
thereunder on the due date hereof, as shown by the Bank's liability record,
together with interest (calculated on the basis of actual days elapsed in a 360
day year) on the unpaid balance hereof from the date hereof until this Note is
fully paid, at one of the following rates:

         (a)  Base Rate Option:  A variable rate of interest equal to the Base
              Rate in effect from time to time.  The interest rate under this
              option shall change as and when the Base Rate changes.

         (b)  LIBOR Rate Option:  The "LIBOR Rate" PLUS two percent (2.0%).
              The "LIBOR Rate" means the rate per annum (rounded up, if
              necessary, to the nearest one-sixteenth of one percent) equal to
              the offered quotation to the Bank in the London interbank
              Eurodollar market for United States dollar deposits for delivery
              on the date specified by the Borrower, in the approximate amount
              of the loan and for the period specified by the Borrower (which
              period must be 30, 60, or 90 days), determined as of
              approximately 11:00 A.M., London time, two business days prior to
              the delivery date.  If the Borrower selects this LIBOR Rate
              Option, it must notify the Bank at least two business days prior
              to the date on which it wishes to receive the loan proceeds.
              Unless the Borrower shall otherwise notify the Bank at least two
              business days prior to the end of an Interest Period, each
              advance bearing interest at the LIBOR Rate shall continue to bear
              interest at the Base Rate.  The LIBOR Rate Option may only be
              selected for minimum principal amounts of $100,000 or multiples
              thereof.

         As used herein, "Base Rate" means the rate of interest established by
the Bank from time to time as its "base" or "prime" rate.

         Interest shall by payable monthly, commencing April 30, 1996 and
continuing on the same day of each succeeding month and also at maturity.

<PAGE>

    The Borrower may at any time prepay the Current Note in whole or in part
without premium or penalty; except that any prepayment of amounts based on the
LIBOR Rate where such prepayment is made on a day other than the final day of an
Interest Period shall require a prepayment penalty in an amount equal to the
difference between the amount of interest that would have been payable for the
remainder of the Interest Period at the rate then in effect and the yield on a
hypothetical U.S. Treasury Security that could be purchased on the date of
prepayment and maturing on the last day of the Interest Period.

    If interest hereon is not paid when due, or if any other indebtedness of
the undersigned to the Bank is not paid when due, or if a garnishment summons or
a writ of attachment is issued against or served upon the Bank for the
attachment of any property of the undersigned in the Bank's possession or any
indebtedness owing to the undersigned, of if the holder hereof shall at any time
in good faith believe that the prospect of due and punctual payment of this Note
is impaired, then, in any such event, the holder hereof may, at its option,
declare this Note to be immediately due and payable and thereupon this Note
shall be immediately due and payable, together with all unpaid interest accrued
hereon, without notice or demand; provided, however, that if this Note is
payable on demand, nothing herein contained shall preclude or limit the holder
hereof from demanding payment of this Note at any time and for any reason,
without notice.  If this Note is not paid when due (whether at maturity or upon
acceleration or demand), the Bank shall also have the right to set off the
indebtedness evidenced by this Note against any indebtedness of Bank to the
undersigned.  This Note shall also become automatically due and payable
(including unpaid interest accrued thereon) without notice or demand should a
petition be filed by or against the undersigned under the United States
Bankruptcy Code.

    Unless prohibited by law, the undersigned agree(s) to pay all costs of
collection, including reasonable attorneys' fees and legal expenses, incurred by
the holder hereof in the event this Note is not duly paid.  The holder hereof
may at any time renew this Note or extend its maturity date for any period and
release any security for, or any party to, this Note, all without notice to or
consent of and without releasing any accommodation maker, endorser or guarantor
from liability on this Note.  Presentment or other demand for payment, notice of
dishonor and protest are hereby waived by the undersigned and each endorser and
guarantor.  This Note shall be governed by the substantive laws of the State
named as part of the Bank's address above.

    This Note is issued pursuant to a Credit Agreement dated April ____, 1996,
between the Borrower and the Bank and is subject to the terms and conditions
thereof.


HEI, Inc.

By:                                By:
   ---------------------------       -----------------------------------

Its:                               Its:
    --------------------------        ----------------------------------


                                         -2-


<PAGE>

                                                                   Exhibit 4.2a


                               REIMBURSEMENT AGREEMENT

                                    BY AND BETWEEN

                                      HEI, INC.

                                         AND

                     NORWEST BANK MINNESOTA, NATIONAL ASSOCIATION


                             Dated As Of:  April 1, 1996
















                                       This Instrument Was Drafted By:

                                       WINTHROP & WEINSTINE, P.A.
                                       3200 Minnesota World Trade Center
                                       30 East Seventh Street
                                       Saint Paul, Minnesota  55101

<PAGE>

                                  TABLE OF CONTENTS

                                      ARTICLE I.

                                     DEFINITIONS . . . . . . . . . . . . . . . 1
    Section 1.1   DEFINED TERMS. . . . . . . . . . . . . . . . . . . . . . . . 1
    SECTION 1.2   OTHER TERMS. . . . . . . . . . . . . . . . . . . . . . . . . 7
    SECTION 1.3   REIMBURSEMENT AGREEMENT CONTROLLING. . . . . . . . . . . . . 7

                                     ARTICLE II.

                      COMMITMENT TO ISSUE THE LETTERS OF CREDIT
                               AND APPROVAL OF ADVANCES. . . . . . . . . . . . 8
    SECTION 2.1   LETTERS OF CREDIT; ADVANCES. . . . . . . . . . . . . . . . . 8
    SECTION 2.2   DRAW REQUESTS - CONSTRUCTION COSTS . . . . . . . . . . . . . 8
    SECTION 2.3   ADDITIONAL DEPOSITS. . . . . . . . . . . . . . . . . . . . .10
    SECTION 2.4   ADVANCES - EQUIPMENT ACQUISITION COSTS . . . . . . . . . . .10
    SECTION 2.5   ADVANCES WITHOUT RECEIPT OF DRAW REQUEST . . . . . . . . . .10
    SECTION 2.6   EXPIRATION, RENEWAL OF LETTERS OF CREDIT . . . . . . . . . .10
    SECTION 2.7   DRAW UNDER LETTERS OF CREDIT TO REDEEM OR DEFEASE BONDS. . .11

                                     ARTICLE III.

                                CONDITIONS OF LENDING. . . . . . . . . . . . .11
    SECTION 3.1   CONDITIONS PRECEDENT TO ISSUANCE OF LETTERS OF CREDIT AND 
                  APPROVAL OF INITIAL ADVANCE. . . . . . . . . . . . . . . . .11
    SECTION 3.2   FURTHER CONDITIONS PRECEDENT TO ANY ADVANCE. . . . . . . . .12

                                     ARTICLE IV.

                          REIMBURSEMENTS AND OTHER PAYMENTS:
                                LENDER'S RIGHT TO CURE . . . . . . . . . . . .13
    SECTION 4.1   OBLIGATION OF REIMBURSEMENT. . . . . . . . . . . . . . . . .13
    SECTION 4.2   PAYMENT OF CREDIT ENHANCEMENT FEE. . . . . . . . . . . . . .13
    SECTION 4.3   CAPITAL ADEQUACY/CHANGE IN LAW . . . . . . . . . . . . . . .14
    SECTION 4.4   COMPUTATION OF CREDIT ENHANCEMENT FEE AND INTEREST . . . . .14
    SECTION 4.5   RIGHT OF LENDER TO CURE DEFAULTS UNDER BOND DOCUMENTS. . . .14
    SECTION 4.6   PAYMENTS . . . . . . . . . . . . . . . . . . . . . . . . . .14
    SECTION 4.7   COLLATERAL . . . . . . . . . . . . . . . . . . . . . . . . .14
    SECTION 4.8   FEES . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
    SECTION 4.9   REDEMPTIONS UNDER SERIES A BONDS . . . . . . . . . . . . . .15


                                         -i-

<PAGE>

                                      ARTICLE V.

                             WARRANTIES, REPRESENTATIONS
                                    AND COVENANTS. . . . . . . . . . . . . . .16
    SECTION 5.1   WARRANTIES AND REPRESENTATIONS . . . . . . . . . . . . . . .16
    SECTION 5.2   COVENANTS. . . . . . . . . . . . . . . . . . . . . . . . . .19

                                     ARTICLE VI.

                     EVENTS OF DEFAULT; RIGHTS AND REMEDIES UPON
                                   EVENT OF DEFAULT. . . . . . . . . . . . . .23
    SECTION 6.1   EVENTS OF DEFAULT. . . . . . . . . . . . . . . . . . . . . .23
    SECTION 6.2   RIGHTS AND REMEDIES. . . . . . . . . . . . . . . . . . . . .25

                                     ARTICLE VII.

                                    MISCELLANEOUS. . . . . . . . . . . . . . .28
    SECTION 7.1   INDEMNIFICATION BY BORROWER. . . . . . . . . . . . . . . . .28
    SECTION 7.2   ADDRESSES FOR NOTICE . . . . . . . . . . . . . . . . . . . .29
    SECTION 7.3   INSPECTIONS. . . . . . . . . . . . . . . . . . . . . . . . .30
    SECTION 7.4   ADDITIONAL SECURITY INTEREST . . . . . . . . . . . . . . . .30
    SECTION 7.5   FEES . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
    SECTION 7.6   TIME OF ESSENCE. . . . . . . . . . . . . . . . . . . . . . .30
    SECTION 7.7   BINDING EFFECT AND ASSIGNMENT. . . . . . . . . . . . . . . .30
    SECTION 7.8   WAIVERS. . . . . . . . . . . . . . . . . . . . . . . . . . .31
    SECTION 7.9   REMEDIES CUMULATIVE. . . . . . . . . . . . . . . . . . . . .31
    SECTION 7.10  GOVERNING LAW; CONSTRUCTION. . . . . . . . . . . . . . . . .31
    SECTION 7.11  JURISDICTION . . . . . . . . . . . . . . . . . . . . . . . .31
    SECTION 7.12  INTEREST RATE. . . . . . . . . . . . . . . . . . . . . . . .31
    SECTION 7.13  COUNTERPARTS . . . . . . . . . . . . . . . . . . . . . . . .31
    SECTION 7.14  NOT JOINT VENTURERS. . . . . . . . . . . . . . . . . . . . .32
    SECTION 7.15  ADEQUACY OF BOND PROCEEDS. . . . . . . . . . . . . . . . . .32
    SECTION 7.16  OBLIGATIONS ABSOLUTE . . . . . . . . . . . . . . . . . . . .32
    SECTION 7.17  TRANSFER OF LETTERS OF CREDIT. . . . . . . . . . . . . . . .32
    SECTION 7.18  LIABILITY OF THE LENDER. . . . . . . . . . . . . . . . . . .32
    SECTION 7.19  SECURITY INTEREST IN FUNDS AND BONDS . . . . . . . . . . . .33
    SECTION 7.20  TERM . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
    SECTION 7.21  REDEMPTION OF THE BONDS UNDER CASUALTY OR 
                  CONDEMNATION LAWS. . . . . . . . . . . . . . . . . . . . . .34

    SIGNATURES
    FORM OF DRAW REQUEST (EXHIBIT A)
    FORM OF AUTHORIZATION TO TRUSTEE-CONSTRUCTION COSTS (EXHIBIT B)
    FORM OF AUTHORIZATION TO TRUSTEE-EQUIPMENT ACQUISITION COSTS


                                         -ii-

<PAGE>

    (EXHIBIT C)
    SCHEDULE OF REQUIRED PRINCIPAL PAYMENTS UNDER SERIES B BONDS 

    (EXHIBIT D)
    JOINDER AGREEMENT


                                        -iii-

<PAGE>

                             REIMBURSEMENT AGREEMENT

THIS REIMBURSEMENT AGREEMENT, made as of the 1st day of April, 1996, by and
between HEI, INC., a Minnesota corporation (the "Borrower"), and NORWEST BANK
MINNESOTA, NATIONAL ASSOCIATION, a national banking association with its banking
house located in Wayzata, Minnesota (the "Lender").

                                   ARTICLE I.

                                   DEFINITIONS

SECTION 1.1  DEFINED TERMS. As used in this Agreement, the following terms shall
have the meanings set out respectively after each except where the context
clearly requires otherwise (such meanings to be equally applicable to both the
singular and plural forms of the terms defined):

    (a)   ADVANCE: the  disbursement from the Construction Fund by the Trustee
    pursuant to the Bond Documents.

    (b)   ARCHITECT: C. M. Architecture, P.A.

    (c)   BOND COUNSEL: Briggs & Morgan, P.A., or such other bond counsel which
    is acceptable to the Lender.

    (d)   BOND DOCUMENTS: individually or collectively, as the context
    requires, the Loan Agreement and the Indenture.

    (e)   BONDS: the $5,625,000 Variable Rate Demand Industrial Development
    Revenue Bonds, Series 1996 A and B (HEI, Inc. Project) issued by the
    Issuer.

    (f)   BORROWED MONEY: funds obtained by incurring contractual indebtedness,
    exclusive of trade accounts payable or money
     borrowed from the Lender.

    (g)   BORROWER DOCUMENTS: collectively, this Reimbursement Agreement, the
    Certificate, the Mortgage, the Security Agreement, the Financing Statements
    and any and all other documents and instruments executed by the Borrower
    and delivered to the Lender in connection with the financing transaction
    contemplated hereby.

    (h)   CASH COLLATERAL ACCOUNT: shall have the meaning assigned thereto in
    Section 6.2(d) hereof.

    (i)   CASH FLOW: for each fiscal year of the Borrower, the aggregate amount
    of the following items properly shown on its year-end income statement,
    determined in accordance with generally accepted accounting principles
    consistently applied:  (i) net


                                          1

<PAGE>

    income after taxes; (ii) amortization expense; (iii) depreciation and
    depletion expense; (iv) deferred tax expense; and (v) similar types of
    noncash charges against income which the Bank determines, in its reasonable
    discretion, to be appropriate "add-backs."

    (j)   CERTIFICATE:  the certificate of no hazardous material of even date
    herewith executed by the Borrower and delivered to the Lender.

    (k)   COLLATERAL SECURITIES: shall have the meaning assigned thereto in
    Section 6.2(d)(1) hereof.

    (l)   COMMITMENT: the commitment of the Lender hereunder to (i) issue the
    Letters of Credit, and (ii) approve the Advances to the Borrower in
    accordance with the provisions hereof in an aggregate principal amount of
    up to and including $5,625,000 plus investment earnings on sums on deposit
    in the Construction Fund.

    (m)   COMMITMENT TERMINATION DATE: April 1, 1998, which date shall
    automatically be extended to February 1, 1999, in the event the Letters of
    Credit are extended pursuant to Section 2.6 hereof, or the date of
    termination of the Commitment pursuant to Section 6.2(a) hereof, whichever
    date occurs earlier.

    (n)   COMPLETION DATE: July 1, 1996 (provided that if the Lender shall
    extend such date in writing, then the Completion Date shall be such later
    date), being the required date of completion of the Facility.

    (o)   CREDIT ENHANCEMENT FEE: shall have the meaning assigned thereto in
    Section 4.2 hereof.

    (p)   CONSTRUCTION COSTS:  the actual costs of the construction of the
    Facility.

    (q)   CONSTRUCTION DOCUMENTS: collectively, all of the following documents
    which shall be in form and substance acceptable to the Lender:

         (1)  The Plans and Specifications;

         (2)  Certificates of Builder's Risk, Worker's Compensation, Liability
         and Property and Extended Coverage Insurance, as required by Section
         5.2(g) hereof and the Mortgage;

         (3) a preliminary sworn construction statement duly executed by the
         Borrower and the General Contractor showing all costs and expenses of
         any kind incurred and to be incurred in constructing and installing
         the Facility, together with a certificate signed by the Borrower
         otherwise reflecting Construction Costs, and showing that Construction
         Costs do not exceed $1,982,738;


                                          2

<PAGE>

         (4)  a copy of the contracts with the General Contractor and the
         Architect, and of all electrical, heating, masonry, plumbing,
         mechanical, and  elevator contracts and all other subcontracts
         required by the Lender relating to the construction and installation
         of the Facility, and assignments thereof to the Lender duly executed
         and delivered by the Borrower, the General Contractor, the Architect
         and such subcontractors permitting the Lender, upon its election after
         the occurrence of an Event of Default, to complete the Facility
         pursuant to, and to acquire the interest of the Borrower under, the
         foregoing contracts and the Plans and Specifications;

         (5)  all building permits and such other evidence as the Lender shall
         request to establish that all necessary building, zoning and rezoning,
         planned unit development, subdivision, platting and environmental
         protection and land use permits and approvals have been obtained, and
         that the Facility as constructed will comply in all respects with all
         applicable restrictions in prior conveyances and all applicable
         ordinance, building, zoning and rezoning, planned unit development,
         subdivision, platting and environmental protection and land use
         requirements;

         (6)  evidence that no hazardous waste or substances are contained on,
         under or in the Project except as may be permitted pursuant to the
         terms of the Certificate; 

         (7)  a soil report, duly certified to the Lender (or in lieu thereof,
         a letter addressed to the Lender from the soil engineer permitting the
         Lender to rely therein), evidencing that satisfactory soil boring
         tests have been conducted by an engineering firm acceptable to the
         Lender at such locations of the Project as are acceptable to the
         Lender, and a certificate signed and delivered by the Architect
         certifying to the Lender that the plans and specifications for the
         Project implement and take into account the recommendations of the
         soil engineer set forth in such report that the foundation designed
         for the Project as reflected in the Plans and Specifications for the
         Project is adequate giving the existing soil conditions of the Project
         Premises; and

         (8)  an appraisal prepared by an MAI designated appraiser acceptable
         to the Lender setting forth the estimated fair market value of the
         Project upon completion of the Facility in accordance with the Plans
         and Specifications relating to the Project of at least $1,775,000,
         together with such documentation as may be necessary to permit the
         Lender to rely thereon.

    (r)   CONTRACTOR:  any person who shall be engaged to work on, or to
    furnish materials and supplies for the Facility.

    (s)   CURRENT MATURITIES OF LONG-TERM DEBT:  that portion of the Borrower's
    "Long-Term Debt" that matures or that is scheduled to be paid during the
    current fiscal year of the Borrower.  For the purposes of this definition,
    "Long-Term Debt" shall mean the following: (i) the aggregate amount of the
    Borrower's liabilities properly shown as non-


                                          3

<PAGE>


    current liabilities on its balance sheet, determined in accordance with
    generally accepted accounting principles consistently applied, as of the
    last day of its preceding fiscal year; and (ii) any new liabilities of the
    Borrower incurred during its current fiscal year that, in accordance with
    generally accepted accounting principles consistently applied, should be
    shown as non-current liabilities on its balance sheet at fiscal year-end.

    (t)   DRAW REQUEST: the form, substantially in the form of EXHIBIT A
    attached hereto, to be submitted to the Lender when an Advance is requested
    and which is referred to in Section 2.2 hereof.

    (u)   ELIGIBLE SECURITIES: shall have the meaning assigned thereto in
    Section 6.2(d)(1) hereof.

    (v)   ESCROW ACCOUNT: the non-interest bearing escrow account to be
    established by the Lender in the name of the Borrower into which any and
    all amounts required to be deposited by the Borrower pursuant to Section
    2.3 hereof shall be deposited.

    (w)   EQUIPMENT ACQUISITION COSTS: the actual cost of the acquisition of
    Project Equipment.

    (x)   EVENT OF DEFAULT: shall have the meaning assigned thereto in Section
    6.1 hereof.

    (y)   FACILITY: the approximately 22,500 square foot addition to an
    existing 23,305 square foot manufacturing facility which will be
    constructed on the Project Premises pursuant to the Plans and
    Specifications, together with all additions to, replacements of and
    substitutions for any of the foregoing which may be made as permitted or
    required by the Lender.

    (z)   FINANCING STATEMENTS: the UCC-1 Financing Statements executed by the
    Borrower to be filed of record in the office of the Minnesota Secretary of
    State and the Hennepin County Recorder, serving to perfect a valid first
    lien on the property subject to the Security Agreement and the personal
    property subject to the Mortgage.

    (aa)  GENERAL CONTRACTOR: Hagman Construction, Inc.

    (bb)  INDENTURE: the Indenture of Trust of even date herewith by and
    between the Issuer and the Trustee relating to the Bonds.

    (cc)  INSPECTING ARCHITECT:  HDR Engineering, Inc.

    (dd)  INTEREST DRAWING: shall have the meaning assigned thereto in the
    Letters of Credit.

    (ee)  ISSUER:  City of Victoria, Minnesota.


                                          4

<PAGE>

    (ff)  LETTERS OF CREDIT: collectively, the Series A Letter of Credit and
    the Series B Letter of Credit.

    (gg)  LOAN AGREEMENT: the Loan Agreement of even date herewith by and
    between the Issuer and the Borrower.

    (hh)  MANDATORY REDEMPTION DATE: the date of each scheduled Mandatory
    Redemption Drawing pursuant to Section 3.1(4) of the Indenture.

    (ii)  MANDATORY REDEMPTION DRAWING: shall have the meaning assigned thereto
    in the Letters of Credit.

    (jj)  MORTGAGE: the Mortgage, Security Agreement, Fixture Financing
    Statement and Assignment of Leases and Rents of even date herewith executed
    by the Borrower for the benefit of the Lender securing payment of all
    amounts which may be advanced by the Lender under the Series B Letter of
    Credit and constituting a valid first lien on a good and marketable fee
    simple title to the Project Premises.

    (kk)  OBLIGATION OF REIMBURSEMENT: shall have the meaning assigned thereto
    in Section 4.1 hereof.

    (ll)  ORGANIZATIONAL DOCUMENTS: collectively, the following documents each
    of which shall be in form and substance acceptable to the Lender;

         (1)  a copy of the Articles of Incorporation of the Borrower, duly
         certified by the Secretary of State of the State of Minnesota;

         (2)  a copy of the Certificate of Good Standing of the Borrower, duly
         issued by the Secretary of State of the State of Minnesota;

         (3)  a copy of the Bylaws of the Borrower, duly certified by an
         officer of the Borrower;

         (4)  a copy of the resolutions of the Borrower authorizing the
         execution, delivery and performance of the Borrower Documents and the
         Loan Agreement, duly certified by an officer of the Borrower; and

         (5)  an opinion of counsel for the Borrower dated as of the date
         hereof and acceptable in form and substance to the Lender.

    (mm)  PLANS AND SPECIFICATIONS: the final plans and specifications for the
    Facility as approved by the Lender and the Inspecting Architect.


                                          5

<PAGE>

    (nn)  PROJECT:  the Project Premises and the Facility, including all
    Project Equipment, as the same may from time to time exist.

    (oo)  PROJECT COSTS:  the sum of (i) Construction Costs; (ii) Equipment
    Acquisition Costs; and (iii) all commitment fees of the Lender, brokerage 
    or finder's fees, interest charges, service fees, attorneys' fees, 
    administrative fees, fiscal consultants' fees, contractors' fees, 
    developers' fees, title insurance fees and charges, recording fees and 
    registration taxes, paid or incurred by or on behalf of the Lender in 
    connection with the Project.

    (pp)  PROJECT EQUIPMENT:  any and all equipment now or hereafter located
    within or used in connection with the Project Premises or the Facility
    acquired, in whole or in part, from proceeds of Bonds, and any additions
    to, replacements of and substitutions for any of the foregoing which may be
    permitted or required by the Lender.

    (qq)  PROJECT PREMISES:  the real estate described in Exhibit A attached to
    the Mortgage.

    (rr)  RELATED DOCUMENTS:  shall have the meaning assigned thereto in
    Section 7.16(a) hereof.

    (ss)  SECURITY AGREEMENT:  the Security Agreement of even date herewith
    executed by the Borrower for the benefit of the Lender securing payment 
    of all amounts payable under this Agreement and constituting a valid 
    first lien on all equipment now owned or hereafter acquired by the 
    Borrower.

    (tt)  SERIES A LETTER OF CREDIT:  the Irrevocable Letter of Credit No.
    S404271 issued by the Lender to the Trustee for the account of the Borrower
    in the original stated amount of $4,388,753.00.

    (uu)  SERIES B LETTER OF CREDIT:  the Irrevocable Letter of Credit No.
    S404272 issued by the Lender to the Trustee for the account of the Borrower
    in the original stated amount of $1,482,053.00.

    (vv)  TANGIBLE NET WORTH:  the sum of the contributed capital, surplus and
    undivided profits of the Borrower, less any amounts attributable to
    treasury stock, good will, patents, copyrights, mailing lists, catalogues,
    trademarks, bond discount and underwriting expenses, organization expenses,
    leasehold improvements and loans to officers or employees and other like
    intangibles (not including prepaid expenses classified as current assets or
    intangible assets offset by equal related liabilities), all as determined
    in accordance with generally accepted accounting principles.

    (ww)  TITLE COMPANY:  Commercial Partners Title, LLC, as agent for Chicago
    Title Insurance Company, or such other title company as is acceptable to
    the Lender.


                                          6

<PAGE>

    (xx)  TITLE DOCUMENTS:  collectively, the following documents, each of
    which shall be acceptable to the Lender:

         (1)  a fully paid mortgagee's title insurance policy issued by the
         Title Company in an amount equal to $1,482,053 insuring the Mortgage
         as a first lien on a good and marketable fee simple title to the
         Project Premises, subject only to "Permitted Encumbrances" (as that
         term is defined in the Mortgage) and, without limiting the generality
         of the foregoing, insuring the Mortgage against claims for mechanics'
         liens, rights of parties in possession and matters which would be
         disclosed by a comprehensive survey and including special assessment
         searches, UCC searches, judgment searches and all other customary
         searches, and a long form zoning endorsement and a comprehensive
         endorsement;

         (2)  written evidence of payment of (i) all real estate taxes relating
         to the Project Premises presently due and payable, and (ii) all levied
         and pending assessments relating to the Project Premises (or, in lieu
         thereof, payment in escrow of an amount determined by the Lender); and

         (3)  a preliminary perimeter land survey of the Project Premises,
         prepared at the Borrower's expense, certified to the Lender by a
         licensed, registered surveyor acceptable to the Lender, dated within
         thirty (30) days of the date hereof and incorporating the legal
         description and street address of the Project Premises; showing the
         location of all points and lines referred to in the legal description;
         identifying the number of square feet and acres contained in the
         Project Premises and the number of vehicles which may be parked in
         designated parking areas; showing the actual or proposed location of
         the Project (including sidewalks, stoops and parking areas) as being
         within the exterior boundaries of the Project Premises and in
         compliance with all setback requirements of the city in which the
         Project is located; identifying the square footage of all existing
         structures and the number of stories of all existing structures;
         showing the location of all easements and encroachments onto or from
         the Project Premises that are visible on the Project Premises, known
         to the surveyor preparing the survey or of record and/or making a
         positive statement that there are no encroachments; identifying
         easements of record by recording data indicating, if possible, the
         dimensions of such easement; showing the location of all utilities
         serving the Project Premises (and tie-in points with respect hereto);
         showing any flood hazard areas; showing all service roads, highways,
         bicycle paths, walkways, right-of-way lines, driveways and parking
         areas on or serving the Project, including the distance from the
         nearest street; and showing any other matters affecting the title to
         the Project Premises or the use thereof.

    (yy)  TOTAL COST OF PROJECT:  The sum of all Project Costs.
 
    (zz)  TRUSTEE:  First Trust National Association, and any co-trustee or
    successor trustee 


                                          7

<PAGE>

    appointed, qualified and then acting as such under the provisions of the
    Indenture.

SECTION I.2  OTHER TERMS.  All capitalized terms used herein and not otherwise
defined in this Agreement shall have the respective meanings for purposes of
this Agreement as are assigned to such terms in Section 1.1 of the Indenture or
Section 1.1 of the Loan Agreement, as the case may be, including, without
limitation, the following terms: Prime Rate; Construction Fund; Interest Payment
Date; Business Day; Alternate Letter of Credit; Series A Bonds; and Series B
Bonds.

SECTION I.3  REIMBURSEMENT AGREEMENT CONTROLLING.  To the extent there exists
any inconsistencies as between the terms and/or provisions contained in this
Reimbursement Agreement and the Bond Documents, the language in this
Reimbursement Agreement shall control.

                                      ARTICLE II

                    COMMITMENT TO ISSUE THE LETTERS OF CREDIT
                            AND APPROVAL OF ADVANCES

SECTION II.1  LETTERS OF CREDIT; ADVANCES.  The Lender hereby agrees that, on
the terms and subject to the conditions hereinafter set forth, the Lender will
issue the Letters of Credit to secure payment of the Bonds and approve the
making of the Advances by the Trustee to the Borrower from time to time from the
Construction Fund from and after the date hereof to the Commitment Termination
Date.  Notwithstanding anything to the contrary contained herein, the Lender
shall only be obligated to approve the Advances to pay Project Costs in an
amount up to or equal to the amount of the Commitment and such obligation is
further subject to the conditions of Article III hereof.

SECTION II.2  DRAW REQUESTS - CONSTRUCTION COSTS.

    (a)  Whenever the Borrower desires to obtain an Advance for Construction
    Costs, which shall be no more often than monthly, the Borrower shall submit
    to the Lender and the Title Company a Draw Request, duly signed by the
    General Contractor, the Architect, the Inspecting Architect and the
    Borrower, setting forth the information requested therein.  Each Draw
    Request shall, if so required by the Lender or the Title Company, be
    submitted at least ten (10) days before the date the Advance is desired. 
    Each Draw Request shall constitute a representation and warranty by the
    Borrower that all representations and warranties set forth in the Borrower
    Documents are true and correct as of the date of such Draw Request.  Draw
    Requests for Construction Costs may be made only from the proceeds of the
    Series B Bonds.

    (b)  At the time of submission of each Draw Request, the Borrower shall
    submit to the Title Company and the Lender the following:


                                          8


<PAGE>

          (1)   A written lien waiver from each Contractor for work done and 
          materials supplied by it which are to be paid for pursuant to all 
          prior Draw Requests; and

          (2)   Such other supporting evidence as may be reasonably requested by
          the Lender to substantiate all payments which are to be made out of 
          the relevant Draw Request and/or substantiate all payments then made 
          with respect to the Facility.

     (c)  At the time of submission of the final Draw Request following 
     completion of the Facility, the Borrower shall submit to the Lender 
     a "as-built" survey with respect to the Project Premises complying with 
     the requirement set forth in Section 1.1(av)(3) hereof, except that the 
     actual, as opposed to the proposed, location of the Facility shall be 
     shown thereon.

     (d)  At the time of submission of the final Draw Request following 
     completion of the Facility, which shall not be submitted before completion 
     of Facility, including all landscape requirements, the Borrower shall 
     submit to the Lender and to the Title Company the following, unless waived 
     by the Lender and the Title Company in writing:

          (1)   a final Sworn Construction Statement, in form and substance 
          acceptable to the Lender, signed by the General Contractor and the 
          Borrower, showing all costs and expenses of any kind incurred in 
          constructing and installing the Facility, and a certificate signed by 
          the Borrower reflecting all Construction Costs paid by the Borrower;

          (2)   a written lien waiver from each Contractor for all work done and
          for all materials furnished by it for the Facility, which lien waiver 
          shall conform in form and amount to the Sworn Construction Statement 
          referred to in (1) above;

          (3)   a master written lien waiver from the General Contractor in an 
          amount equal to the total amount of the costs reflected in the Sworn 
          Construction Statement referred to in (1) above;

          (4)   such other supporting evidence as may be reasonably requested by
          the Lender or the Title Company to substantiate all payments which are
          to be made out of the final Draw Request and/or to substantiate all 
          payments then made with respect to the Facility;

          (5)   evidence reasonably satisfactory to the Lender that all work 
          requiring inspection by municipal or other governmental authorities 
          having jurisdiction has been inspected and approved by such 
          authorities and by the rating or inspection organization, bureau, 
          corporation or office having jurisdiction, and that requisite 
          certificates of occupancy and other approvals have been issued;

          (6)   an AIA Certificate of Substantial Completion signed by the 
          Borrower, the 

                                       9

<PAGE>

          General Contractor, the Architect and the Inspecting Architect 
          certifying that the Facility has been constructed and completed 
          substantially in accordance with the Plans and Specifications; and 

          (7)   a Certificate of Occupancy duly issued by the Issuer.

     (e)  If on the date an Advance for Construction Costs is desired, the 
     Borrower has performed all of its agreements and complied with all 
     requirements theretofore to be performed or complied with hereunder,
     the Lender shall (subject to the conditions set forth in Section 3.1
     hereof and elsewhere herein) approve and authorize the Trustee to 
     disburse the amount of the requested Advance for Construction Costs 
     to the Title Company, first from the Escrow Account and second from 
     the Construction Fund; provided, however, that the final Advance for
     Construction Costs shall be disbursed, first, from the Construction 
     Fund and second from the Escrow Account, and the Title Company shall
     thereafter disburse the amount of the requested Advance within three
     (3) business days to or for the benefit of the Borrower.  The 
     request for the final Advance for Construction Costs may also 
     include a request for reimbursement for any Construction Costs 
     theretofore paid for using proceeds of the Escrow Account.  The form
     of the authorization to the Trustee to advance for Construction 
     Costs is attached hereto as EXHIBIT B.

SECTION II.3  ADDITIONAL DEPOSITS.  If the Lender or the Title Company shall 
at any time in good faith determine that the aggregate undisbursed amounts of 
the portion of the Construction Fund allocated for Construction Costs (i.e., 
the proceeds of the Series B Bonds together with accrued interest thereon) 
and the Escrow Account is less than the amount required to pay all costs and 
expenses of any kind which reasonably may be anticipated in connection with 
the completion of the Facility and shall thereupon send written notice 
thereof to the Borrower specifying the amount required to be deposited by 
Borrower with the Lender to provide sufficient funds to complete the Facility, 
the Borrower, shall within ten (10) calendar days of receipt of any such 
notice, deposit with the Lender in the Escrow Account the amount of funds 
specified in such notice.

SECTION II.4  ADVANCES - EQUIPMENT ACQUISITION COSTS.

     (a)    Whenever the Borrower desires to obtain an Advance for Equipment 
     Acquisition Costs, which shall be no more often than monthly, the Borrower 
     shall submit to the Lender a copy of the invoice for each item of Project 
     Equipment for which the Borrower is seeking reimbursement, which invoice 
     must be stamped "paid" by the vendor.  Each such request for an Advance 
     shall, if so required by the Lender, be submitted at least seven (7) days 
     before the date the Advance is desired. Each such request for an Advance 
     shall constitute a representation and warranty by the Borrower that all 
     representations and warranties set forth in the Borrower Documents are true
     and correct as of the date of such request for an Advance.  Requests for 
     Advances for Equipment Acquisition Costs may be made only from the proceeds
     of the Series A Bonds.  The form of the authorization to the 

                                      10

<PAGE>

     Trustee to advance for Equipment Acquisition Costs is attached hereto as 
     EXHIBIT C.

     (b)    Only new items of Project Equipment shall be subject to 
     reimbursement pursuant to the terms of this Section 2.4.  The Lender 
     shall have the right, at its option, to inspect all items of Project 
     Equipment prior to approving an Advance for reimbursement of the cost 
     of acquisition of such item of Project Equipment.

SECTION II.5  ADVANCES WITHOUT RECEIPT OF DRAW REQUEST.  Notwithstanding 
anything to the contrary contained herein, the Lender shall have the irrevocable
right at any time and from time to time to direct the Trustee to advance monies 
on deposit in the Construction Fund to pay any and all expenses referred to in 
Section 7.5 hereof, all without receipt of a Draw Request from or any approval 
or consent of the Borrower.

SECTION II.6  EXPIRATION, RENEWAL OF LETTERS OF CREDIT.  The Series A Letter of 
Credit shall have an initial expiration date of not later than April 1, 1998, 
but shall be automatically renewable for successive periods of two years each 
(but in no event to a date later than April 1, 2006) unless the Lender 
determines not to renew the term of the Series A Letter of Credit and gives 
written notice of such non-renewal to the Borrower and the Issuer and the 
Trustee at least sixty (60) calendar days prior to the expiration date of the 
Series A Letter of Credit. The Series B Letter of Credit shall have an initial 
expiration date of not later than April 1, 1998, but shall be automatically 
renewable for successive periods of two (2) years each (but in no event to a 
date later than April 1, 2011) unless the Lender determines not to renew the 
term of the Series B Letter of Credit and gives written notice of such 
non-renewal to the Borrower and the Issuer and the Trustee at least sixty (60) 
days prior to the expiration date of the Series B Letter of Credit.  The 
Borrower acknowledges and agrees that the Lender shall have no obligation to 
renew either of the Letters of Credit at any time in the future.  The Borrower 
further acknowledges and understands that the Bonds will be subject to mandatory
redemption if the Lender does not renew the Letters of Credit thereby resulting 
in a draw under the Letters of Credit unless an Alternate Letter of Credit is 
delivered to the Trustee pursuant to the Indenture or unless the Bonds are 
re-marketed pursuant to the terms of the Indenture.

SECTION II.7  DRAW UNDER LETTERS OF CREDIT TO REDEEM OR DEFEASE BONDS.  The 
Borrower acknowledges and agrees that the consent of the Lender is required in 
order for the Trustee to submit a draft under the Letters of Credit for the 
purpose of optionally redeeming Bonds or to defease Bonds pursuant to the 
Indenture.  Such consent shall not be required if the Borrower redeems or 
defeases the Bonds using funds from any other source.

                                      11

<PAGE>

                                  ARTICLE III
                              CONDITIONS OF LENDING

SECTION III.1  CONDITIONS PRECEDENT TO ISSUANCE OF LETTERS OF CREDIT AND 
APPROVAL OF INITIAL ADVANCE.  As a condition precedent to the issuance of the 
Letters of Credit and approval of the initial Advance hereunder, the following 
agreements, documents and other items shall have been executed and/or delivered 
to the Lender by the party indicated, each of which documents, agreements and 
other items shall be in form and substance acceptable to the Lender (unless 
waived in writing by the Lender):

     (a)    the Borrower Documents, duly executed and delivered by the Borrower;

     (b)    the Bond Documents, duly executed by the parties thereto;

     (c)    evidence that the Mortgage has been duly filed of record in the 
     office of the Hennepin County Recorder (a "marked-up" policy of title 
     insurance issued by the Title Company shall satisfy this condition);

     (d)    the Construction Documents; 

     (e)    the Organizational Documents;

     (f)    the Title Documents;

     (g)    evidence acceptable to the Lender, including presentation of lien 
     waivers and other receipts of payment acceptable to the Lender, that the 
     Borrower has theretofore paid costs and expenses with respect to the 
     Project in an amount equal to the difference between the Construction 
     Costs and the proceeds of the Series B Bonds, or, in lieu thereof, 
     deposited such amount into the Escrow Account, and the Lender shall not be 
     obligated to approve any Advance to reimburse the Borrower for such costs 
     and expenses;

     (h)    an opinion of Bond Counsel issued in connection with the Bonds which
     states that the Bonds are validly issued, are not arbitrage bonds, and the 
     interest on the Bonds is not includable in gross income for federal income 
     tax purposes either addressed to the Lender or accompanied by a reliance 
     letter indicating that the Lender is entitled to rely on the opinion;

     (i)    certified copies of the preliminary and final resolution or 
     ordinances adopted by the Issuer authorizing the issuance of the Bonds;

     (j)    the Credit Enhancement Fee in the amount of $58,055.74 for the 
     Letters of Credit that will accrue from April 9, 1996, through and 
     including March 31, 1997, as required under Section 4.2 hereof;

                                      12

<PAGE>

     (k)    evidence of payment to the Lender of a non-refundable real estate 
     underwriting fee in the amount of $8,100.00;

     (l)    evidence of payment to the Trustee of the $750.00 set up fee and the
     first semiannual trustee fee in the amount of $750.00;

     (m)    evidence of payment of all expenses incurred by the Lender which are
     payable by the Borrower pursuant to Section 7.5 hereof; and

     (n)    such other documents and instruments as the Lender may reasonably 
     request.

SECTION III.2   FURTHER CONDITIONS PRECEDENT TO ANY ADVANCE.  The obligation of 
the Lender to make or cause to be made each Advance (including the initial 
Advance) shall be subject to the further conditions precedent that on the date 
of such Advance:

     (a)    no Event of Default, and no event which with the giving of notice or
     the lapse of time or both would constitute an Event of Default, shall have 
     occurred and be continuing and all representations and warranties made by 
     the Borrower in Article V hereof shall continue to be true and correct as 
     of the date of such Advance;

     (b)    with respect to a request for an Advance for Construction Costs, no 
     determination shall have been made by the Lender or the Title Company under
     the provisions of Section 2.3 hereof that additional funds are to be 
     deposited with the Trustee, or, if such a determination has been made and 
     notice thereof sent to the Borrower, the Borrower shall have deposited the 
     necessary funds with the Trustee in accordance with Section 2.3 hereof;

     (c)    with respect to a request for an Advance for Construction Costs, if 
     required by the Lender, the Lender shall have been furnished with a 
     statement of the Borrower and of any Contractor, in form and substance 
     acceptable to the Lender setting forth the names, addresses and amounts due
     or to become due as well as the amounts previously paid to every 
     Contractor, subcontractor, person, firm or corporation furnishing materials
     or performing labor in connection with the construction of any part of the 
     Facility;

     (d)    the Borrower shall have provided to the Lender such evidence of 
     compliance with all of the provisions of this Agreement as the Lender may 
     reasonably request; and

     (e)    no license or permit necessary for the construction and installation
     of the Facility shall have been revoked nor the issuance of any such 
     license or permit or the authority of the Borrower to construct the 
     Facility shall have been subjected to challenge by or before any court or 
     other governmental authority having or asserting jurisdiction over the 
     Project.

                                      13

<PAGE>
                                     ARTICLE IV

                       REIMBURSEMENTS AND OTHER PAYMENTS:
                             LENDER'S RIGHT TO CURE

SECTION IV.1  OBLIGATION OF REIMBURSEMENT.  The Borrower hereby agrees to pay 
Lender (the "Obligation of Reimbursement") (i) on the day that any amount is 
drawn under the Letters of Credit a sum equal to the amount drawn under the 
Letters of Credit plus any and all reasonable charges and expenses which the 
Lender may pay or incur relative to such draw, (ii) on demand, any amounts 
advanced by the Lender in its sole discretion to cure any event of default under
the Bond Documents, and (iii) on demand, interest on all amounts remaining 
unpaid by the Borrower to the Lender under this Agreement at any time accruing 
from the date such amounts become payable (in the case of an amount payable on 
demand, which interest shall accrue from the date the Lender is first entitled 
to demand payment,  regardless of whether a demand for payment is actually 
made), until payment in full, at an annual rate equal to two percent (2%) per 
annum in excess of the Prime Rate, as the same changes from time to time; 
provided, however, that no interest shall accrue or be payable on any amounts 
paid by the Lender pursuant to a draft submitted under the Letters of Credit if 
the full amount of such draft is reimbursed by the Borrower to the Lender, by 
2:00 o'clock p.m. on the same day such draft is paid by the Lender.  A schedule 
of the principal payments required under the Series B Bonds is attached hereto 
as EXHIBIT D.

SECTION IV.2  PAYMENT OF CREDIT ENHANCEMENT FEE.  So long as either of the 
Letters of Credit is outstanding, the Borrower agrees to pay the Lender a Credit
Enhancement Fee with respect to the Letters of Credit (the "Credit Enhancement 
Fee") for each year commencing on April 1 and ending on March 31 (or portion 
thereof) that either of the Letters of Credit is outstanding equal to one 
percent (1.0%) per annum of the sum of (a) the maximum amount available to be 
drawn under the Letters of Credit on the first day of such year, plus (b) the 
amount which is subject to reinstatement (either automatic or optional) on such 
day pursuant to the Letters of Credit.  The Credit Enhancement Fee shall be due 
and payable in advance on or before March 31 of each year.  Notwithstanding the 
foregoing, if and for so long as an Event of Default has occurred and continues 
or exists, then, at the Lender's option, the Credit Enhancement Fee shall 
thereafter be increased by an additional two percent (2.0%) per annum.  In 
addition, in the event the Borrower no longer maintains its line of credit or 
primary depository account(s) with the Lender, then, at the Lender's option, the
Credit Enhancement Fee shall thereafter be increased by an additional one 
percent (1.0%) per annum.

                                      14

<PAGE>

SECTION IV.3  CAPITAL ADEQUACY/CHANGE IN LAW.  If any change in any law or 
regulation or in the interpretation thereof by any court or administrative 
governmental authority charged with the administration thereof shall either 
(i) impose, modify or deem applicable or modify any capital adequacy, reserve, 
special deposit or similar requirement against letters of credit issued by, or 
assets held by, or deposits in or for the account of the Lender (including 
without limitation, a requirement which affects the Lender's allocation of 
capital resources), or (ii) impose on the Lender any other condition regarding 
this Agreement or either of the Letters of Credit, and the result of any event 
referred to in the preceding clause (i) or (ii) shall be to increase the cost 
(including without limitation, reserve or similar cost) to the Lender of issuing
or maintaining the Letters of Credit or reduce the Lender's return hereunder or 
all or any of the Lender's capital is reduced (which increase in cost or 
reduction in return shall be determined by the Lender's reasonable allocation of
the aggregate of such cost increases or return reductions resulting from such 
events), then upon demand by the Lender, the Borrower shall immediately pay to 
the Lender, from time to time as specified by the Lender, additional amounts 
which shall be sufficient to compensate the Lender for such increased cost, 
together with interest on each such amount from the date demanded until payment 
in full thereof at the rate provided for in Section 4.1 hereof.  A certificate 
as to such increased costs incurred by the Lender as a result of any event 
mentioned in clause (i) or (ii) above, submitted by the Lender to the Borrower 
shall be conclusive, absent manifest error, as to the amount thereof.

SECTION IV.4  COMPUTATION OF CREDIT ENHANCEMENT FEE AND INTEREST.  The Credit 
Enhancement Fee and interest payable on amounts due under this Agreement shall 
be computed on the basis of a 360-day year and charged for actual days elapsed.

SECTION IV.5  RIGHT OF LENDER TO CURE DEFAULTS UNDER BOND DOCUMENTS.  If the 
Borrower shall fail to make any payments under the Bond Documents on the day 
such payment is first due and payable by the Borrower, or shall fail to comply 
with any other covenant or agreement of the Borrower under the Bond Documents, 
or if any other default or event of default shall occur under the Bond 
Documents, the Lender shall have the option, in the Lender's sole discretion, 
to cure any such failure by taking action reasonably required to effect such 
cure, including, without limitation, making the required payment directly to the
Trustee.  Any such payment by the Lender shall constitute an advance repayable 
by the Borrower in accordance with Section 4.1 hereof.  The Borrower shall be 
responsible for any costs and/or expenses incurred by the Lender in curing any 
such default or event of default. 

SECTION IV.6  PAYMENTS.  All payments by the Borrower to the Lender hereunder 
shall be made in lawful currency of the United States in immediately available 
funds at the Lender's office at 900 East Wayzata Boulevard, Wayzata, Minnesota 
55391.  In addition, the Lender shall have the right to debit any of the 
Borrower's accounts at the Lender without further authorization of the Borrower 
to make any such payments. 

SECTION IV.7  COLLATERAL. The Borrower hereby acknowledges that the Obligation 
of Reimbursement and each and every other liability and indebtedness of the 
Borrower hereunder are secured by the security interests and other liens granted
to the Lender by the Borrower 

                                      15

<PAGE>

pursuant to the Security Agreement, and that the Obligation of Reimbursement 
with respect to amounts advanced under the Series B Letter of Credit is also
secured pursuant to the Mortgage.

SECTION IV.8  FEES.  In addition to the Credit Enhancement Fee, the Borrower 
shall pay to the Lender, on demand, such fees as are customarily charged by the 
Lender from time to time in connection with the amendment and administration of 
letters of credit, as the same change from time to time.  In addition to the 
foregoing, the Borrower shall pay a customary transfer fee to the Lender (in an 
amount not to exceed $500 per transfer) if either or both of the Letters of 
Credit is transferred to a successor trustee under the Indenture.

SECTION IV.9  REDEMPTIONS UNDER SERIES A BONDS.  The parties hereto acknowledge 
that Advances for Equipment Acquisition Costs may be obtained from the 
Construction Fund from the date hereof through and including the Commitment 
Termination Date, but that the Borrower has not yet determined the timing of 
requests for Advances for Equipment Acquisition Costs.  As a result, the 
Series A Bonds have been structured to require no principal payments on the 
Series A Bonds until the April 1, 2006 maturity date thereof.  The Borrower 
agrees, however, that as of April 1 of each year during the term of the Series A
Bonds commencing as of April 1, 1997, it shall, pursuant to the provisions of 
Section 8.2(a) of the Loan Agreement, direct the Trustee to call for redemption 
and prepayment of a portion of the Series A Bonds under the provisions of 
Section 3.1(1) of the Indenture, in an amount determined in accordance with the 
terms set forth in this Section 4.9.  The amount of each annual redemption shall
be determined as follows:

     (a)    The total amount of Advances which have been made hereunder for 
     Equipment Acquisition Costs from the date hereof through and including 
     February 1, 1997, shall be divided by seven (7).  This amount, when added 
     to the amounts determined pursuant to subsections (b) and (c) below and 
     rounded up pursuant to subsection (d) below, shall be applied to redeem a 
     portion of the Series A Bonds on each April 1 commencing with April 1, 
     1997, continuing on each April 1 thereafter through and including April 1, 
     2003.

     (b)    The total amount of Advances which have been made hereunder for 
     Equipment Acquisition Costs from February 1, 1997, through and including 
     January 31, 1998, shall be divided by seven (7). This amount, when added to
     the amounts determined pursuant to subsection (a) above and subsection (c) 
     below and rounded up pursuant to subsection (d) below, shall be applied to 
     redeem a portion of the Series A Bonds on each April 1 commencing with 
     April 1, 1998, and continuing on each April 1 thereafter through and 
     including April 1, 2004.

     (c)    The total amount of Advances which have been made hereunder for 
     Equipment Acquisition Costs from February 1, 1998, through and including 
     February 1, 1999, shall be divided by seven (7). This amount, when added to
     the amounts determined pursuant to subsections (a) and (b) above and 
     rounded up pursuant to subsection (d) below, shall be applied to redeem a 
     portion of the Series A Bonds on each April 1 commencing with April 1, 
     1999, and continuing on each April 1 thereafter through and including 
     April 1, 2005.

                                      16


<PAGE>

    (d)  The amounts payable on each April 1 as determined pursuant to 
         subsections (a), (b) and (c) above shall be added together and rounded
         up to the next $5,000 increment.  This amount shall be the amount 
         applied to redeem the Series A Bonds pursuant to the terms of this 
         Section 4.9.

    By way of illustration, assume that the total Advances for Equipment 
    Acquisition Costs from the date hereof through February 1, 1997, is 
    $1,400,000, that the total Advances for Equipment Acquisition Costs from 
    February 1, 1997, through January 31, 1998, is $1,600,000, and that the 
    total Advances for Equipment Acquisition Costs from February 1, 1998, 
    through February 1, 1999, is $1,205,000.  The required annual redemptions 
    for the Series A Bonds shall be determined as follows:

<TABLE>
<CAPTION>
              Tranche (a)         Tranche (b)         Tranche (c)
Date         ($1,400,000/7)      ($1,600,000/7)      ($1,205,000/7)       Sum         Rounding
- ----         --------------      --------------      --------------       ---         --------
<S>          <C>                <C>                 <C>                  <C>         <C>
 
4/1/97           200,000                                                 200,000       200,000
4/1/98           200,000            228,571                              428,571       430,000
4/1/99           200,000            228,571             172,143          600,714       605,000
4/1/00           200,000            228,571             172,143          600,714       605,000
4/1/01           200,000            228,571             172,143          600,714       605,000
4/1/02           200,000            228,571             172,143          600,714       605,000
4/1/03           200,000            228,571             172,143          600,714       605,000
4/1/04                              228,571             172,143          400,714       405,000
4/1/05                                                  172,143          172,143       145,000
                                                                                     ---------
                    TOTAL REDEMPTIONS:                                               4,205,000
                                                                                     ---------
                                                                                     ---------
</TABLE>


                                   ARTICLE V. 

                           WARRANTIES, REPRESENTATIONS
                                  AND COVENANTS

SECTION V.1  WARRANTIES AND REPRESENTATIONS.  The Borrower hereby represents 
and warrants to the Lender as follows:

         (a)  the Borrower is a corporation duly organized, validly existing and
         in good standing under the laws of the State of Minnesota, and is under
         no legal disability to execute, deliver and perform the Borrower 
         Documents and the Bond Documents and to own its property and conduct 
         its business as presently conducted and as proposed to be conducted;


                                      17

<PAGE>

         (b)  the Borrower possesses adequate licenses, certificates, permits, 
         franchises, patents, copyrights, trademarks and trade names, or rights
         thereto, to conduct its business substantially as now conducted and as
         presently proposed to be conducted;

         (c)  the execution, delivery and performance of the Borrower Documents
         and the Bond Documents will not violate any provision of the 
         organizational documents of the Borrower or of any law, rule, 
         regulation or court order or result in the breach of or constitute a
         default under any indenture or loan, credit or other agreement or
         instrument to which the Borrower is a party or by which it or its
         properties may be bound or affected or result in the creation or 
         imposition or any lien, charge or encumbrance of any nature upon any of
         its properties or assets contrary to the terms of any such instrument 
         or agreement;

         (d)  the Borrower Documents and the Bond Documents each constitutes the
         legal, valid and binding obligation of the Borrower enforceable in 
         accordance with its respective terms (except, as to enforceability, to
         the extent limited by bankruptcy, insolvency and other similar laws 
         affected creditors' rights generally);

         (e) the Project and the intended use thereof for the purpose and in the
         manner contemplated by this Agreement are permitted by and will comply
         in all material respects with all presently applicable use or other
         restrictions and requirements in prior conveyances, zoning ordinances
         and all development, pollution control, water conservation and other
         laws, regulations, rules and ordinances of the United States and the
         State of Minnesota and the respective agencies thereof, and the 
         political subdivision in which the Project is located;

         (f)  there is no suit, action or proceeding pending or, to the 
         knowledge of the Borrower, threatened against or affecting the Borrower
         before or by any court, arbitrator, administrative agency or other
         governmental authority which, if adversely determined, would materially
         and adversely affect its business, properties, operations, assets or 
         condition (financial or otherwise) or the validity of any of the
         transactions contemplated by the Borrower Documents, the Bond Documents
         or any of the documents related thereto, or the ability of the 
         Borrower to perform its obligations hereunder or thereunder or as 
         contemplated hereby or thereby;

         (g)  the Borrower has furnished the Lender with financial statements 
         for the Borrower for its fiscal year ended August 31, 1995, and for its
         fiscal quarter ended February 29, 1996, each of which financial 
         statements fairly presents the financial condition of the  Borrower at
         and as of the date thereof, and, as of said date, there were no 
         material liabilities of the Borrower, direct or indirect, fixed or 
         contingent, which were not reflected in the financial statements or the
         notes thereto;

         (h)  the Borrower has filed all federal and state tax returns and
         reports required to be filed, which returns properly reflect the taxes
         owed by it for the period covered thereby


                                      18

<PAGE>

         and it has paid or made appropriate provisions for the payment of all
         taxes which may become due pursuant to said returns and for the payment
         of all present installments of any assessments, fees and other 
         governmental charges upon it or upon any of its property;

         (i)  no consent, approval or authorization of or permit or license from
         or registration with or notice to any federal or state regulatory 
         authority or any third party is required in connection with the making
         or performance of the Borrower Documents, the Bond Documents or any 
         document or instrument related hereto or thereto, or, if so required, 
         such consent, approval, authorization, permit or license has been 
         requested and obtained or such registration made or notice given or
         such other appropriate action taken on or prior to the date hereof;

         (j)  the Borrower is not in default of a material provision under any 
         material agreement, instrument, decree or order to which it is a party
         or to which it or its property is bound or affected;

         (k)  to the Borrower's knowledge, and except as permitted by the 
         Certificate, no pollutants or other toxic or hazardous waste or 
         substances, including any solid, liquid, gaseous, or thermal irritant
         or contaminant, such as smoke, vapor, soot, fumes, acids, alkalis,
         chemicals or waste (including materials to be recycled, reconditioned
         or reclaimed) (collectively "substances") which is regulated by law,
         regulation, ordinance or code have existed in, on or under the Project
         Premises or have been discharged, dispersed, released, stored, 
         treated, generated, disposed of, or allowed to escape (collectively 
         referred to as an "incident") on the Project Premises.  The Borrower 
         shall not permit third parties to cause an incident, shall take 
         reasonable steps to ensure that an incident does not occur, and shall 
         promptly take all appropriate steps to remedy an incident, in
         compliance with all local, state and federal laws and regulations
         should an incident occur;

         (l)  no underground storage tanks are located on the Project Premises
         or, to the Borrower's knowledge, were located on the Project Premises
         and subsequently removed or filled;

         (m)  no dump, sanitary landfill or gasoline service station are or were
         located on Project Premises;

         (n)  no investigation, administrative order, consent order and 
         agreement, litigation, or settlement (collectively referred to as the
         "action") including, but not limited to, proceedings or actions 
         commenced by any person (including, but not limited to any federal,
         state, or local government or agency or entity before any court or
         administrative agency) with respect to substances is proposed, 
         threatened, anticipated or in existence with respect to Project 
         Premises;

         (o)  to the Borrower's knowledge, the Project and the Borrower's 
         operations at the 


                                      19

<PAGE>

         Project always have been and now are in substantial compliance with  
         all applicable federal, state and local statutes, laws and regulations.
         No notice has been served on the Borrower from any entity, governmental
         body or individual claiming any violation of any law, regulation, 
         ordinance or code, or requiring compliance with any law, regulation, 
         ordinance or code, or demanding payment or contribution for 
         environmental damage or injury to natural resources, or any injury to 
         human health; and

         (p)  each and all of the warranties and representations of the Borrower
         set forth and contained in each of the Bond Documents are true and
         correct in all material respects as of the date hereof.

Each of the foregoing representations and warranties shall be deemed to be
repeated and reaffirmed in all material respects on and as of the date any
Advance is made.  In addition, the request for each Advance hereunder by the
Borrower shall constitute a representation and warranty by the Lender that the
representations of the Borrower as set forth in Section 3.5(3) of the Loan
Agreement are true and correct with respect to the requested Advance.

SECTION V.2  COVENANTS  In addition to the covenants and agreements of the 
Borrower set forth and contained in the other Borrower Documents, the 
Borrower hereby covenants and agrees to and with the Lender as follows, so 
long as either of the Letters of Credit remains outstanding and any amounts 
remain due and payable to the Lender by the Borrower pursuant to Article IV 
hereof, unless otherwise agreed or consented to by the Lender:

    (a)  that all Advances shall be used to pay Project Costs;  that the 
    Project does and shall comply with all applicable restrictions, 
    conditions, ordinances, regulations and laws of governmental departments 
    and agencies having jurisdiction over the Project, and does not and shall
    not violate any private restrictions or covenants or encroach upon or 
    interfere with easements affecting the Project Premises; and that the 
    Borrower will commence and carry on continuously, diligently and with
    reasonable dispatch, the construction of the Facility in conformance to the
    Plans and Specifications, free from all mechanics, labors, and materialmen's
    liens, and in good and workmanlike manner, and substantially complete the 
    Facility on or before the Completion Date;

    (b)  to keep, perform, enforce and maintain in full force and effect all of
    the terms, covenants, conditions and requirements of the Borrower Documents,
    the Bond Documents, the Title Documents, the Organizational Documents and 
    the Construction Documents; not to amend, modify, supplement, terminate, 
    cancel or waive any of the terms, covenants, conditions or requirements of
    any of said documents without the prior written consent of the Lender; and
    to execute such amendments, modifications, supplements and extensions of 
    said documents as may be reasonably requested by the Lender;

    (c)  upon the demand of the Lender for reasonable cause, from time to time 
    not more frequently than once every two (2) years during the term hereof, to
    deliver to the Lender 


                                      20


<PAGE>

     an updated survey showing the Facility to be located within applicable 
     lot lines of the Project Premises and set back lines and not 
     encroaching upon any easements, streets or adjoining property, and to 
     deliver to the Lender from time to time and at any time updated and 
     recertified copies of the Title Documents, the Organizational 
     Documents and Construction Documents;

     (d)    not to create, permit to be created or to allow to exist, any 
     liens, charges or encumbrances on the Project (other than "Permitted 
     Encumbrances" as defined in the Mortgage) and the lien of general real 
     estate taxes pending and special assessments not due and payable 
     except for such liens, charges and encumbrances which are being 
     diligently contested in good faith by appropriate proceedings and 
     provided that, if requested by the Lender, the Borrower shall have 
     deposited into escrow with the Lender an amount equal to such lien, 
     charge or encumbrance plus some penalties accrued thereon;

     (e)    not to assign this Agreement or any interest
     herein or all or any part of the Advances to be made hereunder;

     (f)    to use its best efforts to require each
     Contractor to comply with all rules, regulations, ordinances and laws
     bearing on its conduct of work on the Facility;

     (g)    to obtain and maintain at times during the process of 
     constructing and installing the Facility and at all times thereafter 
     during the term of the Letters of Credit, if applicable (and, from 
     time to time at the request of the Lender, furnish the Lender with 
     proof of payment of premiums on):

          (1)   builder's risk insurance, written on the so-called "Builder's 
          Risk Completed Value Basis", in an amount equal to total 
          construction costs for the Facility, and with coverage available on 
          the so-called "all risk", non-reporting form of policy, the 
          Lender's interest to be protected in accordance with a loss payable 
          clause in form and content satisfactory to the Lender, naming the 
          Lender as mortgagee and loss payee;

          (2)   comprehensive general liability insurance (including 
          operations, contingent liability, operations of subcontractors, 
          complete operations and contractual liability insurance) in such 
          amount as the Lender may require from time to time (but with 
          coverage of not less than $1,000,000/$1,000,000) and naming the 
          Lender as an additional insured;

          (3)   worker's compensation insurance, with statutory coverage 
          covering all persons engaged in the construction or installation of 
          the Project;

          (4)   hazard insurance, with respect to completed portions of the 
          Project, insuring against loss by fire, lightning, vandalism, 
          malicious mischief and other


                                      21

<PAGE>

          risks customarily covered by a standard extended coverage 
          endorsement, in an amount not less than the face amount of the 
          Series B Letter of Credit or the full insurable value of the 
          Project, whichever is greater, and naming the Lender as mortgagee 
          and loss payee;

          (5)   flood insurance, if any of the Land is located in a "flood 
          plain" as defined by the Federal Insurance Administration, in the 
          maximum obtainable amount up to the face amount of the Series B 
          Letter of Credit, naming the Lender as loss payee (unless an 
          appropriate official of the city in which the Project Premises is 
          located states in writing that all of the Project Premises is not 
          located in a "flood plain" as defined by the Federal Insurance 
          Administration);

          (6)   rent loss or business interruption insurance, with respect to 
          completed portions of the Project, with respect to the perils set 
          forth in paragraph (4) above, in an amount sufficient to enable the 
          Borrower to make the required payments under this Agreement, to pay 
          taxes and insurance and continue operations during an assumed 
          reconstruction period of one (1) year, naming the Lender as 
          mortgagee and loss payee; and

          (7)   such insurance with respect to the Project Equipment as is 
          required by the Security Agreement;

     Such policies of insurance to be in form and content satisfactory to the
     Lender and to be placed with financially sound and reputable insurers
     licensed to transact business in the State of Minnesota and to contain an
     agreement of the insurer to give not less than thirty (30) days' advance
     written notice to the Lender in the event of cancellation, change or non-
     renewal of such policy effecting the coverage thereunder; acceptance of
     such insurance policies not to bar the Lender from requiring additional
     insurance (either in type or amount) at a later date which it reasonably
     deems necessary;

     (h)  to keep accurate books of record and account for itself in which 
     true and complete entries will be made in accordance with generally 
     acceptable accounting principles consistently applied and, upon 
     request of the Lender will give any representative of the Lender 
     access during normal business hours to, and permit such representative 
     to examine, copy or make extracts from any and all books, records, 
     contracts, plans, drawings, permits, bills and statements of account 
     pertaining to the Project, to inspect any of its properties and to 
     discuss its affairs, finances and accounts with any of its officers, 
     all at such times as often as it may reasonably be requested by the 
     Lender or its officers or representatives;

     (i)    to hold the Lender harmless, and the Lender shall have no 
     liability or obligation of any kind to the Borrower, creditors of the 
     Borrower or any third party, in connection with any defective, 
     improper or inadequate workmanship performed in or about, or materials 
     supplied to, the Project Premises and the Facility, or any mechanics, 
     suppliers 


                                      22

<PAGE>

     or materialmen's liens arising as a result of such defective, improper 
     or inadequate workmanship or materials, and upon the Lender's 
     reasonable request, to replace or cause to be replaced, any such 
     defective, improper or inadequate workmanship or materials;

     (j)    to pay all real estate taxes prior to the attachment of 
     penalties with respect thereto and installments of special assessments 
     payable therewith, insurance premiums with respect to the insurance 
     required to be maintained by the Borrower under the terms of any of 
     the Borrower Documents, and any utility charges incurred by the 
     Borrower prior to or during the term of this Agreement, except as to 
     such taxes, assessments, premiums or charges which are being contested 
     in good faith by appropriate proceedings and provided that, if 
     requested by the Lender, the Borrower shall have deposited into escrow 
     with the Lender an amount equal to such taxes, assessments, premiums 
     or charges plus penalties accrued thereon; provided, however, that the 
     right of the Borrower to contest such taxes and assessments shall only 
     constitute an agreement between the Lender and the Borrower and, 
     without limiting the generality of the foregoing, nothing contained 
     herein shall constitute an agreement by or the consent of the Issuer 
     to the nonpayment of any such taxes or assessments, whether or not the 
     same are being so contested;

     (k)    to perform each and all of the covenants and agreements set 
     forth and contained in the Bond Documents;

     (l)    to cause to be prepared and delivered to the Lender the 
     following:

               (i)     as soon as available and in any event within
               ninety (90) days after the end of its fiscal year, audited
               financial statements of the Borrower (balance sheet, income
               statement and statement of cash flow), all in reasonable detail
               and prepared in accordance with generally accepted accounting
               principles, consistently applied, prepared by independent
               certified public accountants acceptable to the Lender; and

               (ii)    from time to time, with reasonable
               promptness, such further information regarding the business,
               operations, affairs and financial and other condition of the
               Borrower and the Project as the Lender may request;

     (m)    to promptly give notice in writing to the Lender of any and all 
     litigation involving the Borrower where the amount in dispute exceeds 
     $50,000 and is not covered by insurance, and of any and all litigation 
     if the aggregate amount in dispute in connection with such litigation 
     exceeds $50,000 and is not covered by insurance, and of any and all 
     material  proceedings commenced against the Borrower by or before any 
     court or governmental or regulatory agency;

     (n)    to comply with the requirements of all applicable laws, rules, 
     regulations and orders of any governmental authority, a breach of 
     which would materially and adversely affect the business or credit of 
     the Borrower, except where diligently contested in good



                                      23

<PAGE>

     faith and by proper proceedings;

     (o)    to preserve and maintain all of the Borrower's rights, 
     privileges and franchises necessary or desirable in the normal conduct 
     of the Borrower's business; and not to suspend business operations or 
     convey, transfer, encumber or pledge a substantial portion of its 
     properties or assets;

     (p)    to keep all of the assets and properties necessary in the 
     Borrower's business in good working order and condition, ordinary wear 
     and tear excepted;

     (q)    to obtain all necessary and convenient state, federal, local 
     and private clearances, authorizations, permits and licenses with 
     respect to the business operations of the Borrower, including, without 
     limitation, any export and other trade licenses or permits required by 
     law for the present or future business operations of the Borrower;

     (r)    not to undertake or permit without prior written approval of 
     the Lender any other or additional construction on the Project 
     Premises or on any site or sites adjacent thereto owned by the 
     Borrower or any parties related thereto;

     (s)    not to create, incur, assume or suffer to exist, contingently 
     or otherwise, indebtedness in excess of $500,000.00 for Borrowed Money 
     in any fiscal year, except indebtedness disclosed to the Lender in 
     writing as existing at the time of execution of this Agreement;

     (t)    not to permit its Tangible Net Worth to be less than 
     $12,400,000.00 for its fiscal year ending August 31, 1996, and 
     $13,900,000.00 for its fiscal year ending August 31, 1997;

     (u)    not to permit its long-term debt to Tangible Net Worth ratio to 
     exceed 1.0 to 1.0 at any time during the term hereof; 

     (v)    to produce a net profit after taxes quarterly, and to produce 
     an annual net profit of at least $1,500,000 for the Borrower's fiscal 
     years ending August 31, 1996 and August 31, 1997; and

     (w)    to maintain a ratio of Cash Flow to Current Maturities of 
     Long-Term Debt of at least 1.5 to 1.0 for each fiscal year of the 
     Borrower during the term hereof.


                                   ARTICLE VI

                   EVENTS OF DEFAULT; RIGHTS AND REMEDIES UPON
                                EVENT OF DEFAULT


SECTION VI.1  Events of Default.  Any one or more of the following events, 
conditions or 


                                      24


<PAGE>

circumstances shall constitute an Event of Default:

     (a)    the Borrower shall fail to pay, within five (5) days after the 
     due date thereof, any amounts required to be paid by the Borrower 
     under this Agreement or any other indebtedness of the Borrower to the 
     Lender or any third party, whether any such indebtedness is now 
     existing or hereafter arises and whether direct or indirect, due or to 
     become due, absolute or contingent, primary or secondary or joint or 
     joint and several;

     (b)    the Borrower shall fail to observe or perform any of the 
     covenants, conditions or agreements to be observed or performed by it 
     under the Borrower Documents, the Bond Documents or any credit or 
     similar agreement between the Borrower and the Lender for a period of 
     thirty (30) days after written notice, specifying such default and 
     requesting that it be remedied, given to such party by the Lender, 
     unless the Lender shall agree in writing to an extension of such time 
     prior to its expiration, or for such longer period as may be 
     reasonably necessary to remedy such default (other than defaults which 
     can be cured by a money payment) provided that the Borrower is 
     proceeding with reasonable diligence to remedy the same;

     (c)    the Borrower shall file a petition in bankruptcy or for 
     reorganization or for an arrangement pursuant to any present or future 
     state or federal bankruptcy act or under any similar federal or state 
     law, or shall be adjudicated a bankrupt or insolvent, or shall make a 
     general assignment for the benefit of its creditors, or shall be 
     unable to pay its debts generally as they become due; or if a petition 
     or answer proposing the adjudication of the Borrower as a bankrupt or 
     its reorganization under any present or future state or federal 
     bankruptcy act or any similar federal or state law shall be filed in 
     any court and such petition or answer shall not be discharged or 
     denied within sixty (60) days after the filing thereof; or if a 
     receiver, trustee or liquidator of the Borrower or of all or 
     substantially all of the assets of the Borrower or of the Project 
     shall be appointed in any proceeding brought against the Borrower and 
     shall not be discharged within sixty (60) days of such appointment; or 
     if the Borrower shall consent to or acquiesce in such appointment; or 
     if any property of the Borrower (including, without limitation, the 
     estate or interest of the Borrower in the Project or any part thereof) 
     shall be levied upon or attached in any proceeding;

     (d)    final judgment(s) for the payment of money in excess of 
     $50,000, individually or in the aggregate, shall be rendered against 
     the Borrower and shall remain undischarged for a period of thirty (30) 
     days during which execution shall not be effectively stayed;

     (e)    the Borrower shall be or become insolvent (whether in the 
     equity or bankruptcy sense);

     (f)    any representation or warranty made by the Borrower in the 
     Borrower Documents or the Bond Documents shall prove to be untrue or 
     misleading in any material respect, or any statement, certificate or 
     report furnished hereunder or under any of the foregoing


                                      25

<PAGE>

     documents by or on behalf of the Borrower shall prove to be untrue or 
     misleading in any material respect on the date when the facts set 
     forth and recited therein are stated or certified;

     (g)    at the time any Advance is requested by the Borrower hereunder 
     the title to the Project is not reasonably satisfactory to the Lender, 
     regardless of whether the lien, encumbrance or other question existed 
     at the time of any prior Advance, unless such lien, or encumbrance has 
     been consented to in writing by the Lender;

     (h)    a survey shows that the Facility encroaches upon any unvacated 
     street or upon any adjoining property to an extent deemed material by 
     Lender;

     (i)    the construction and installation of the Facility is abandoned 
     or shall be unreasonably delayed or be discontinued for a period of 
     twenty (20) consecutive calendar days following written notice to the 
     Borrower by the Lender, in each instance for reasons other than acts 
     of God, fire, storm, strikes, blackouts, labor difficulties, riots, 
     inability to obtain materials, equipment or labor, governmental 
     restrictions or any similar cause over which the Borrower is unable to 
     exercise control;

     (j)    the Borrower at any time prior to the completion and 
     installation of the Facility shall (i) abandon the same, or (ii) delay 
     construction or suffer construction to be delayed for any period of 
     time, so that the completion of the construction and installation of 
     the Facility cannot be accomplished, in the reasonable judgment of the 
     Lender, by the Completion Date;

     (k)    the Lender or the Title Company shall, under the provisions of 
     Section 2.3 hereof, determine in good faith that additional sums are 
     to be deposited with the Lender pursuant thereto and the Borrower 
     shall fail to deposit such sums as required by said section; or

     (l)    the Borrower shall fail to timely effect a prepayment of the 
     Series A Bonds as required by Section 4.9 hereof.

SECTION VI.2 Rights and Remedies.  Upon the occurrence and continuance 
of an Event of Default, the Lender may, at its option, exercise any 
and all of the following rights and remedies (and any other rights and 
remedies available to it):

     (a)    The Lender may refrain from approving Advances until such Event 
     of Default is cured but the Lender may approve Advances after the 
     occurrence of a Event of Default without thereby waiving its rights 
     and remedies hereunder.

     (b)    The Lender shall have the right, in addition to any other 
     rights provided by law, to enforce its rights and remedies under the 
     Borrower Documents and any other documents related hereto.


                                      26

<PAGE>

     (c)    The Lender may instruct the Trustee to accelerate the Bonds and 
     submit a draft under either of the Letters of Credit pursuant to the 
     Indenture.

     (d)    The Lender may make demand upon the Borrower and forthwith upon 
     such demand the Borrower will pay to the Lender in immediately 
     available funds for deposit in a special cash collateral account 
     maintained with the Lender (the "Cash Collateral Account") an amount 
     equal to the maximum amount then available to be drawn under the 
     Letters of Credit (assuming compliance with all conditions for drawing 
     thereunder).  The Lender hereby acknowledges the Trustee's security 
     interest in any and all funds deposited by the Borrower hereunder and 
     agrees that, so long as either of the Letters of Credit is 
     outstanding, the Lender's interest in such funds shall be subordinate 
     to the interest of the Trustee.

     Notwithstanding the foregoing, the Lender shall have sole discretion 
     in administering such funds, including the right to return such funds 
     to the Borrower if the Lender so elects, until the Obligation of 
     Reimbursement and the Credit Enhancement Fee then due shall have been 
     paid in full:

          (1)   If requested by the Borrower and subject to the right of the 
          Lender to withdraw funds from the Cash Collateral Account as 
          provided below and subject to the limitations provided below, the 
          Lender will from time to time invest funds on deposit in the Cash 
          Collateral Account, reinvest proceeds and invest interest or other 
          income received from any such investments, in such Eligible 
          Securities (as hereinafter defined) as the Borrower may select and 
          give notice thereof to the Lender.  Such proceeds, interest or 
          income which are not so invested or reinvested in Eligible 
          Securities shall, except as otherwise provided in this Section 
          6.2(d), be deposited and held by the Lender in the Cash Collateral 
          Account.  "Eligible Securities" means (A) United States Treasury 
          bills with a remaining maturity not in excess of 90 days, (B) 
          negotiable certificates of deposit of the Lender or of any other 
          bank having combined capital and surplus of at least $10,000,000 
          with a remaining maturity not in excess of 90 days, and (C) such 
          other instruments as the Borrower may request and the Lender may 
          approve in writing.  Eligible Securities from time to time 
          purchased and held pursuant to this subsection (d)(1) shall be 
          referred to as "Collateral Securities" and shall, for purposes of 
          this Agreement, constitute part of the funds held in the Cash 
          Collateral Account in amounts equal to their respective outstanding 
          principal amounts.

          (2)   If at any time the Lender determines that any funds held in 
          the Cash Collateral Account are subject to any right or claim of 
          any person or entity other than the Lender or that the total amount 
          of such funds is less than the maximum amount at such time 
          available to be drawn under the Letters of Credit, the Borrower 
          will, forthwith upon demand by the Lender, pay to the Lender, as 


                                      27

<PAGE>

          additional funds to be deposited and held in the Cash Collateral 
          Account, an amount equal to the excess of (A) such maximum amount 
          at such time available to be drawn under the Letters of Credit over 
          (B) the total amount of funds, if any, then held in the Cash 
          Collateral Account which the Lender determines to be free and clear 
          of any such right and claim.

          (3)   The Borrower hereby pledges and grants to the Lender a 
          security interest in all funds held in the Cash Collateral Account 
          (including Collateral Securities) from time to time and all 
          proceeds thereof, as security for the payment of all amounts due 
          and to become due from the Borrower to the Lender under this 
          Agreement.

          (4)   The Lender may, at any time or from time to time after funds 
          are deposited in the Cash Collateral Account or invested in 
          Collateral Securities, after selling (upon ten days' notice to the 
          Borrower), if necessary, any Collateral Securities, apply funds 
          then held in the Cash Collateral Account to the payment of any 
          amounts,  in such order as the Lender may elect, as shall have 
          become or shall become due and payable by the Borrower to the 
          Lender under this Agreement.  The Borrower agrees that, to the 
          extent notice of sale of any Collateral Securities shall be 
          required by law, at least ten days' notice to the Borrower of the 
          time and place of any public sale or the time after which any 
          private sale is to be made shall constitute reasonable 
          notification.  The Lender may adjourn any public or private sale 
          from time to time by announcement at the time and place fixed 
          therefor, and such sale may, without further notice, be made at the 
          time and place to which it was so adjourned.

          (5)   Neither the Borrower nor any person or entity claiming on 
          behalf of or through the Borrower shall have any right to withdraw 
          any of the funds held in the Cash Collateral Account, except as 
          otherwise provided in subsection (6) below, except that after the 
          expiration of the Letters of Credit in accordance with its terms 
          and the payment of all amounts payable by the Borrower to the 
          Lender under this Agreement, any funds remaining in the Cash 
          Collateral Account shall promptly be returned by the Lender to the 
          Borrower or paid to whomever may be legally entitled thereto.

          (6)   The Borrower agrees that it will not (A) sell or otherwise 
          dispose of any interest in the Cash Collateral Account or any funds 
          held therein, or (B) create or permit to exist any lien, security 
          interest or other change or encumbrance upon or with respect to 
          said account or any funds or Collateral Securities held therein 
          except as provided in or contemplated by this Agreement.

          (7)   The Lender shall exercise reasonable care in the custody and 
          preservation of any funds held in the Cash Collateral Account and 
          shall be deemed to have exercised such care if such funds are 
          accorded treatment substantially equivalent 



                                      28


<PAGE>

          to that which the Lender accords its own property, it being 
          understood that the Lender shall not have any responsibility for 
          taking any necessary steps to preserve rights against any parties 
          with respect to any such funds.

          (8)   Any amount deposited in the Cash Collateral
     Account pursuant to Section 2.3 of the Mortgage may be utilized in
     connection with an Optional Tender Drawing under the terms of the
     Indenture. 

     (e)  The Lender, in its sole discretion, may pay any amount owing under 
     the Bond Documents, including without limitation, principal of, 
     interest and premium on the Bonds or the Lender may cure any other 
     event of default under the Bond Documents; 

     (f)  The Lender may, by written notice to the Borrower in accordance 
     with the terms of such indebtedness declare all indebtedness of 
     every type or description owed by the Borrower to the Lender to be 
     immediately due and payable and the same shall be thereupon be 
     immediately due and payable;

     (g)  The Lender may offset any deposits of the Borrower held by the 
     Lender (including those held by the Lender in the Cash Collateral 
     Account and any unmatured time deposits) against sums due hereunder 
     or against any other indebtedness then owed by the Borrower to the 
     Lender, whether or not then due;

     (h)   The Lender may enter upon the Project and take possession 
     thereof, and proceed in its own name or in the name of the Borrower 
     (which authority is coupled with an interest and is irrevocable by 
     the Borrower but which is not intended to nor shall it exclude the 
     Borrower from possession thereof) to complete or cause to be 
     completed the Facility, at the cost and expense of the Borrower.  
     If the Lender elects to complete or cause to be completed the 
     Project, it may do so according to the Plans and Specifications or 
     according to such changes, alterations or modifications in and to 
     the Plans and Specifications as the Lender may deem appropriate; 
     and the Lender may enforce or cancel all contracts let by the 
     Borrower relating to construction and installation of the Facility 
     and/or let by other Contractors which in the Lender's sole judgment 
     it may deem advisable; and the Borrower shall forthwith turn over 
     and duly assign to the Lender, as the Lender may from time to time 
     require, contracts relating to construction and installation of the 
     Facility, the Plans and Specifications, blueprints, shop drawings, 
     bonds, building permits, bills and statements of account pertaining 
     to the Facility, whether paid or not, and any other instruments or 
     records in the possession of the Borrower pertaining to the 
     Facility.  The Borrower shall be liable under this Agreement to pay 
     to the Lender, on demand, any amount or amounts expended by the 
     Lender in so completing the Facility together with any costs, 
     charges, or expenses incident thereto or resulting therefrom, all 
     of which shall be secured by the Mortgage and the Security 
     Agreement.  In the event that a proceeding is instituted against 
     Borrower for recovery and reimbursement of any monies expended by 
     the Lender in connection with the completion of the Facility, a 
     statement of such expenditures, verified by the affidavit of an 
     officer of the Lender, shall be prima facie evidence of the item so 
     expended and of the propriety of and necessity for such 
     expenditure; and the burden of proving to the contrary


                                       29

<PAGE>

     shall be upon the Borrower.  The Lender shall have the right to 
     apply the funds on deposit in the Construction Fund and the Escrow 
     Account to bring about the completion of the Facility and to pay 
     the costs thereof; and if such funds are insufficient, in the sole 
     judgment of the Lender, to pay for the Facility, the Borrower 
     agrees to promptly deliver and pay to the Lender such sum or sums 
     of money as the Lender may from time to time demand for the purpose 
     of completing the Facility or of paying any liability, charge or 
     expense which may have been incurred or assumed by the Lender under 
     or in performance of this Agreement, or for the purpose of 
     completing the Facility.  It is expressly understood and agreed 
     that in no event shall the Lender be obligated or liable in any way 
     to complete the Facility or to pay for the costs of construction 
     thereof beyond the amount of the Commitment.

                                 ARTICLE VII.

                                 MISCELLANEOUS

SECTION VII.1  Indemnification by Borrower.

     (a) The Borrower agrees to indemnify and hold harmless the Lender, 
     its officers, agents and employees, against any and all losses, 
     claims, damages or liability to which the Lender, its officers, 
     agents and employees, may become subject under any law in 
     connection with the issuance and sale of the Bonds and the carrying 
     out of the transactions contemplated by the Borrower Documents and 
     the Bond Documents, or the conduct of any activity on the 
     Borrower's premises, other than any such losses, claims, damages or 
     liability resulting from the gross negligence or willful misconduct 
     of the Lender or its officers, directors, agents or employees, and 
     to reimburse the Lender, its officers, agents and employees, for 
     any reasonable out-of-pocket legal and other expenses (including 
     reasonable counsel fees) incurred by the Lender, its officers, 
     agents and employees, in connection with investigating any such 
     losses, claims, damages or liabilities or in connection with 
     defending any actions relating thereto.  The Lender agrees, at the 
     request and expense of the Borrower, to cooperate in the making of 
     any investigation in defense of any such claim and promptly to 
     assert any or all of the rights and privileges and defenses which 
     may be available to the Lender.  The Borrower further releases and 
     agrees to hold harmless the Lender, its officers, agents and 
     employees, from any liability to the Borrower arising out of any 
     covenant, representation or undertaking contained in the Bond 
     Documents.  The provisions of this Section shall survive the 
     payment and redemption of the Bonds.

     (b)    The Borrower hereby indemnifies and holds harmless the 
     Lender from and against any and all claims, damages, losses, 
     liabilities, costs or expenses whatsoever which the Lender may 
     incur (or which may be claimed against the Lender by any person or 
     entity whatsoever) (i) by reason of any untrue statement or alleged 
     untrue statement of any material fact contained in any official 
     statement or other offering document relating to the offer or sale 
     of the Bonds or the omission or alleged omission to state therein a 
     material


                                          30

<PAGE>

     fact necessary to make such statements, in light of the circumstances 
     under which they are made, not misleading (except any statement or 
     omission relating to the Lender contained in any written materials 
     supplied or approved by the Lender), or (ii) by reason of or in 
     connection with the execution and delivery or transfer of, or payment or 
     failure to pay under the Letters of Credit; provided, however, that the 
     Borrower shall not be required to indemnify the Lender for any claims, 
     damages, losses, liabilities, costs or expenses to the extent, but only 
     to the extent, caused by the willful misconduct or gross negligence of 
     the Lender or its officers, directors, agents or employees, in 
     connection with paying or wrongfully dishonoring a draft presented under 
     the Letters of Credit.  Nothing in this Section 7.1 is intended to limit 
     the Borrower's Obligation of Reimbursement.

SECTION VII.2  ADDRESSES FOR NOTICE.  All notices, consents, requests, 
demands and other communications hereunder shall be given to or made upon the 
respective parties hereto at their respective addresses specified below or, 
as to any party, at such other address as may be designated by it in a 
written notice to the other party.  All notices, requests, consents and 
demands hereunder shall be effective when personally delivered or duly 
deposited in the United States mails, certified or registered, postage 
prepaid, sent via facsimile or delivered to the telegraph company addressed 
as aforesaid:

     If to the Lender:

          Norwest Bank Minnesota, National Association
          Wayzata Office
          900 East Wayzata Boulevard
          Wayzata, MN  55391-2410
          Attention:  Commercial Banking
          Facsimile No:  (612) 476-3382

     If to the Borrower:

          HEI, Inc.
          1495 Steiger Lake Lane
          P.O. Box 5000
          Victoria, MN  55386
          Facsimile No.: (612) 443-2668

SECTION VII.3  INSPECTIONS. The Borrower and the Architect shall be 
responsible for making inspections of the Project during the course of 
construction and shall determine to their own satisfaction that the work done 
or materials supplied by the Contractors to whom payment is to be made out of 
each Advance has been properly done or supplied in accordance with the 
applicable contracts with such Contractors.  If any work done or materials 
supplied by a Contractor are not satisfactory to the Borrower or the 
Architect, the Borrower will immediately notify the Lender in writing of such 
fact.  It is expressly understood and agreed that the Lender


                                    31

<PAGE>

or its authorized representative (including, without limitation, the 
Inspecting Architect) may conduct such inspections of the Project as it may 
deem necessary for the protection of the Lender's interest, and specifically, 
an architectural firm acceptable to the Lender (including, without 
limitation, the Inspecting Architect) may, at the option of the Lender, and 
at the expense of the Borrower, conduct such periodic inspections of the 
Project, prepare such written progress reports during the period of 
construction and prepare such written reports upon completion of the Project, 
as the Lender may request.  Any inspections which may be made of the Project 
by the Lender or its representative (including without limitation, the 
Inspecting Architect) will be made, and all certificates issued by the 
Lender's representative (including without limitation, the Inspecting 
Architect) will be issued, solely for the benefit and protection of the 
Lender, and the Borrower will not rely thereon.

SECTION VII.4  ADDITIONAL SECURITY INTEREST.  In the event any Advance is to 
be made for materials then being fabricated or stored, or both, for later use 
in the completion of the Facility but which have not been stored upon the 
Project Premises or installed or incorporated into the Project, then such 
Advance shall be made only after the Borrower has given to the Lender such 
security instruments and insurance on such materials as the Lender may 
reasonably request.

SECTION VII.5  FEES.  The Borrower will reimburse the Lender upon demand for 
all reasonable costs and expenses, including without limitation, attorney's 
fees, appraisal fees, survey fees, closing charges, inspection fees, 
documentary or tax stamps, recording and filing fees, mortgage registration 
tax, insurance premiums and service charges, paid or incurred by the Lender 
in connection with (i) the preparation, negotiation, approval, execution and 
delivery of the Bonds, this Agreement, the Mortgage, the Security Agreement 
and any other documents and instruments related hereto or thereto; (ii) the 
negotiation of any amendments or modifications to any of the foregoing 
documents, instruments or agreements in the preparation of any and all 
documents necessary to effect such amendments or modifications; (iii) the 
servicing of the Letters of Credit; (iv) the review of any document submitted 
to the Lender pursuant to Article II or III hereof; and (v) the enforcement 
by the Lender during the term hereof or thereafter of any of the rights or 
remedies of the Lender hereunder or under any of the foregoing documents, 
instruments or agreements, including without limitation, costs and expenses 
of collection in the Event of Default, whether or not suit is filed with 
respect thereto.  

SECTION VII.6  TIME OF ESSENCE.  Time is of the essence in the performance of 
this Agreement.

SECTION VII.7 BINDING EFFECT AND ASSIGNMENT.  This Agreement shall be binding 
upon and inure to the benefit of the Borrower and its successors and 
permitted assigns, except that Borrower may not transfer or assign its rights 
hereunder without the prior written consent of the Lender.  This Agreement 
shall inure to the benefit of the Lender and its participants, successors and 
assigns.  All rights and powers specifically conferred upon the Lender may be 
transferred or delegated by the Lender to any of its participants, successors 
or assigns.

SECTION VII.8 WAIVERS.  No waiver by the Lender of any right, remedy or Event 
of Default 


                                   32


<PAGE>

hereunder shall operate as a waiver of any other right, remedy, or Event of 
Default or of the same right, remedy or Event of Default on a future 
occasion.  No delay on the part of the Lender in exercising any right or 
remedy hereunder shall operate as a waiver thereof, nor shall any single or 
partial exercise of any right or remedy preclude other or future exercise 
thereof or the exercise of any other right or remedy.

SECTION VII.9  REMEDIES CUMULATIVE.  The rights and remedies herein 
specified of the Lender are cumulative and not exclusive of any rights or 
remedies which the Lender would otherwise have at law or in equity or by 
statute.

SECTION  VII.10 GOVERNING LAW; CONSTRUCTION.  This Agreement shall be 
governed by and construed in accordance with the internal law, and not the 
law of conflict, of the State of Minnesota.  Whenever possible, each 
provision of this Agreement and/or any of the other Borrower Documents, and 
any other statement, instrument or transaction contemplated hereby or thereby 
or relating hereto or thereto shall be interpreted in such manner as to be 
effective and valid under such applicable law, but, if any provision of this 
Agreement and/or any of the other Borrower Documents or any other statement, 
instrument or transaction contemplated hereby or thereby or relating hereto 
or thereto should be held to be prohibited or invalid under such applicable 
law, such provision shall be ineffective only to the extent of such 
prohibition or invalidity, without invalidating the remainder of such 
provision or the remaining provisions of this Agreement and/or any of the 
Borrower Documents, or any other statement, instrument or transaction 
contemplated hereby or thereby or relating hereto or thereto.  In the event 
of any conflict within, between or among the provisions of this Agreement, 
the other Borrower Documents, or any other statement, instrument or 
transaction contemplated hereby or thereby or relating hereto or thereto, 
those provisions giving the Lender the greater right shall govern.

SECTION  VII.11  JURISDICTION.  THE BORROWER HEREBY SUBMITS ITSELF TO THE 
JURISDICTION OF THE STATE OF MINNESOTA AND THE FEDERAL COURTS OF THE UNITED 
STATES LOCATED IN SUCH STATE IN RESPECT OF ALL ACTIONS ARISING OUT OF OR IN 
CONNECTION WITH THE INTERPRETATION OR ENFORCEMENT OF THIS AGREEMENT AND THE 
DOCUMENTS RELATED HERETO.  

SECTION  VII.12  INTEREST RATE.  Anything herein to the contrary 
notwithstanding, the obligations of the Borrower under this Agreement shall 
be subject to the limitation that payments of interest shall not be required 
to the extent that contracting for or receipt thereof would be contrary to 
the provisions of law applicable to the Lender limiting the highest rate of 
interest which may be lawfully contracted for, charged or received by the 
Lender.

SECTION VII.13 COUNTERPARTS.  This Agreement may be executed in any number 
of counterparts, each of which when so executed and delivered shall be an 
original, but such counterparts shall together constitute one and the same 
instrument.

SECTION VII.14 NOT JOINT VENTURERS.  The Lender is not, and shall not by 
reason of any


                                    33

<PAGE>

provision of any of the Borrower Documents be deemed to be, a joint venturer 
with or partner or agent of the Borrower.

SECTION  VII.15 ADEQUACY OF BOND PROCEEDS.  The Lender has not made, nor 
shall it be deemed to have made, any representation or warranty that the 
funds to be advanced to the Borrower as contemplated hereby are or will be 
sufficient for the purposes intended by the Borrower.

SECTION VII.16  OBLIGATIONS ABSOLUTE.  Subject to Section 7.18 hereof, the 
obligations of the Borrower under this Agreement shall be absolute, 
unconditional and irrevocable, and shall be paid and performed strictly in 
accordance with the terms of this Agreement, under all circumstances 
whatsoever, including, the following circumstances:

     (a)    any lack of validity or enforceability of the Letters of Credit,
     the Bonds, any of the Bond Documents, or any other agreement or 
     instrument relating thereto (collectively the "Related Documents");

     (b)    any amendment or any waiver of or any consent to departure from
     all or any of the Related Documents;

     (c)    the existence of any claim, set-off, defense or other right
     which the Borrower may have at any time against the Issuer, the Trustee,
     any beneficiary or any transferee of the Letters of Credit (or any
     person or entity for whom the Issuer, the Trustee, any such beneficiary
     or any such transferee may be acting), or any other person or entity,
     whether in connection with this Agreement, the transactions contemplated
     herein or in the Related Documents or any unrelated transactions;

     (d)    any statement or any other document presented under the Letters
     of Credit proving to be forged, fraudulent, invalid or insufficient in
     any respect or any statement therein being untrue or inaccurate in any
     respect whatsoever; or

     (e)    payment by the Lender under the Letters of Credit against 
     presentation of a draft or certificate which does not comply with the
     terms of the Letters of Credit.

SECTION VII.17  TRANSFER OF LETTERS OF CREDIT.  The Letters of Credit may 
only be transferred in accordance with the terms thereof.

SECTION VII.18  LIABILITY OF THE LENDER.  The Borrower assumes all risks of 
the acts or omissions of the Issuer, the Trustee or any beneficiary or 
transferee of the Letters of Credit with respect to its use of the Letters of 
Credit.  Neither the Lender nor any of its employees, officers or directors, 
in its or their capacity as issuer of the Letters of Credit shall be liable 
or responsible for:

     (a)    the use which may be made of the Letters of Credit or for any
     acts or omissions


                                       34

<PAGE>

     of the Issuer, the Trustee or any beneficiary or transferee in
     connection therewith;

     (b)    the validity, sufficiency or genuineness of documents, or of
     any endorsement thereon, even if such documents should in fact prove
     to be in any or all respects invalid, insufficient, fraudulent
     or forged; or

     (c)    payment by the Lender against presentation of documents which
     do not comply with the terms of the Letters of Credit, including failure
     of any documents to bear any reference or adequate reference to the Letters
     of Credit; 

except that the Borrower shall have a claim against the Lender, and the 
Lender shall be liable to the Borrower, to the extent, but only to the 
extent, of any direct, as opposed to consequential, damages (including 
reasonable attorneys fees, costs and expenses) suffered by the Borrower which 
were caused by:

          (1)   the willful misconduct or gross negligence of the Lender or
          its officers, directors, agents or employees in determining whether
          documents presented under the Letters of Credit comply with the terms
          of the Letters of Credit; or

          (2)   the willful failure or gross negligence of the Lender or its
          officers, directors, agents or employees to pay under the Letters of
          Credit after the presentation to it by the Trustee or an approved
          successor trustee of a draft and certificate strictly complying with 
          the terms and conditions of the Letters of Credit.

SECTION VII.19  SECURITY INTEREST IN FUNDS AND BONDS.  As additional security 
for payment of its obligations under this Agreement, the Borrower hereby 
grants a security interest to the Lender in all securities, assets, deposits 
in and rights to payment from all funds now or hereafter on deposit in or 
otherwise a part of any fund created by the Trustee under the Indenture or 
any and all other accounts created under the Indenture, including Bonds and 
Bond proceeds held pursuant to the Indenture, and in the proceeds realized  
from the investment of any such items, and in any and all Bonds and 
substitutions of such Bonds at any time held by the Trustee; and the Borrower 
hereby consents to the Lender's appointment of the Trustee as the Lender's 
agent to perfect the Lender's security interest in such funds and other 
assets.  The security interest granted hereunder shall be subordinate to the 
Trustee's right to apply such funds in accordance with the Indenture and 
subordinate to the rights of holders of the Bonds in and to such funds.  All 
payments on Bonds or funds held by the Trustee as agent for the Lender under 
this Section 7.19, including (without limitation) any payment of principal or 
interest or proceeds of sale, shall be paid directly to the Lender.  All such 
payments received by the Lender shall be credited against the Borrower's 
Obligation of Reimbursement.  The Lender shall be entitled to exercise all of 
the rights of an owner of the Bonds held by the Trustee as agent for the 
Lender with respect to voting, consenting and directing the Trustee as if the 
Lender were the owner of such Bonds, and the Borrower hereby grants and 
assigns to the Lender all such rights.


                                    35


<PAGE>

SECTION VII.20  TERM.  This Agreement shall automatically terminate upon the 
later of (i) expiration of the Letters of Credit, or (ii) payment in full of 
the Obligation of Reimbursement and all other amounts due and payable by the 
Borrower to the Lender hereunder or under the documents related hereto.

SECTION  VII.21  REDEMPTION OF THE BONDS UNDER CASUALTY OR CONDEMNATION LAWS. 
To the extent that the Borrower has the right to direct the Issuer to call 
for redemption of the Bonds under Section 3of the Indenture, the Borrower 
shall promptly give such direction to the Issuer if (i) the Lender has the 
right and shall have elected to apply proceeds of insurance or condemnation 
to redemption of the Bonds pursuant to the Mortgage; and (ii) the Borrower 
has been instructed in writing by the Lender to give such direction.  A copy 
of any such written direction to the Issuer shall be given by the Borrower to 
the Lender.  If the Borrower shall fail to give such direction to the Issuer 
within seven (7) calendar days after being instructed to do so by the Lender, 
the Lender shall have the authority to give such direction to the Issuer on 
behalf of the Borrower, and if the Borrower fails to deposit with the Trustee 
the amount required to redeem the Bonds, the Lender may direct the Trustee to 
submit a draft under the Letters of Credit, in which case the Borrower shall 
be obligated to repay the same pursuant to Section 4hereof, less the amount 
of any insurance or condemnation proceeds paid to the Lender pursuant to the 
Mortgage and available to the Lender for redemption of the Bonds.  To 
facilitate such authority, the Borrower hereby irrevocably appoints (which 
appointment is coupled with an interest) the Lender or its delegate as the 
attorney-in-fact to the Borrower with the right to give such direction to the 
Issuer in the name of and on behalf of the Borrower.  If the Lender elects to 
give such direction to the Issuer, the Lender will give the Borrower a copy 
of such direction.

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly 
executed and delivered as of the day and year first above written.


                                   NORWEST BANK MINNESOTA,
                                   NATIONAL ASSOCIATION


                                   By:
                                      --------------------------
                                      Its:
                                          ----------------------


                                      36


<PAGE>

                                   HEI, INC.


                                   By:
                                      --------------------------------
                                   Its:
                                       -------------------------------


                                   By:
                                      --------------------------------
                                   Its:
                                       -------------------------------



                                        37


<PAGE>

                                    EXHIBIT A
                                        
                             [FORM OF DRAW REQUEST]

<PAGE>

                                    EXHIBIT B

             [FORM OF AUTHORIZATION TO TRUSTEE - CONSTRUCTION COSTS]

To:  First Trust National Association
     180 E. Fifth Street
     St. Paul, Minnesota 55101
     Attn:  Corporate Trust Department


RE:  Letters of Credit Nos. S404271 and S404272 in favor of First Trust 
National Association, as trustee, issued by Norwest Bank Minnesota, National 
Association, to secure payment of the City of Victoria, Minnesota, $5,625,000 
Variable Rate Demand Industrial Development Revenue Bonds, Series 1996 A and 
B (HEI, Inc. Project)



You are hereby authorized to advance $____________ to Commercial Partners Title,
LLC, in connection with the above-referenced financing.

Dated:____________________         NORWEST BANK MINNESOTA,
                                   NATIONAL ASSOCIATION


                                   By:_________________________________

                                         Its:__________________________

<PAGE>

                                    EXHIBIT C

          [FORM OF AUTHORIZATION TO TRUSTEE - EQUIPMENT ACQUISITION COSTS]

To:  First Trust National Association
     180 E. Fifth Street
     St. Paul, Minnesota 55101
     Attn:  Corporate Trust Department


RE:  Letters of Credit Nos. S404271 and S404272 in favor of First Trust 
National Association, as trustee, issued by Norwest Bank Minnesota, National 
Association, to secure payment of the City of Victoria, Minnesota, $5,625,000 
Variable Rate Demand Industrial Development Revenue Bonds, Series 1996 A and 
B (HEI, Inc. Project)




You are hereby authorized to advance $____________ to Norwest Bank Minnesota,
National Association, in connection with the above-referenced financing.

Dated:____________________         NORWEST BANK MINNESOTA,
                                   NATIONAL ASSOCIATION


                                   By:_________________________________

                                         Its:__________________________


<PAGE>

                                    EXHIBIT D

         (Schedule of Principal Payments Required Under Series B Bonds)



<PAGE>

                                JOINDER AGREEMENT

For good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the undersigned, Commercial Partners Title, LLC, as agent
for Chicago Title Insurance Company ("Title"), hereby assumes and agrees to
perform all of the duties and responsibilities of Title as specified in the
within Reimbursement Agreement by and between Norwest Bank Minnesota, National
Association (the "Lender"), and HEI, Inc. (the "Borrower") dated as of April 1,
1996 (the "Reimbursement Loan Agreement"), subject to the following conditions:

     (i)  The responsibilities and duties assumed by Title shall include only
     those described in the Reimbursement Agreement, and Title shall not be
     obligated to act except in accordance with the terms and conditions of the
     Reimbursement Agreement.

     (ii) By executing this Agreement, Title does not thereby insure that (a)
     the Project will be completed, (b) the Project, when completed, will be in
     accordance with the Plans and Specifications, or (c) sufficient funds will
     be available for completion of the Project.

     (iii)     By executing this Agreement, Title does not thereby make any
     certifications of the type required to be given by the inspectors,
     architects or engineers, nor does it assume any liability for the same
     other than procurement of such certifications as one of the conditions
     precedent to each disbursement.

     (iv) At any time prior to commencement of disbursement of funds hereunder,
     Title reserves the right to decline any risk offered for insurance
     hereunder, whereupon it shall return to the Lender any documents in its
     possession relating to such loan and the funds received by it. 
     Commencement of disbursement makes this Agreement effective as to all funds
     received and disbursed.  Where, after the first disbursement, a further
     title search reveals a subsequently recorded exception over which Title is
     unwilling to insure, it will notify the Lender and may discontinue
     disbursement, until the exception has been disposed of to its satisfaction.
     A mechanic's lien claim or other filing or title defect over which Title is
     required to insure hereunder does not warrant a discontinuance of
     disbursement.

Title further agrees to deliver the mortgagee's policy of title insurance
referred to in the Reimbursement Agreement and all recorded documents, when
available, to the Lender, and bill all Title's charges to the Borrower.

IN WITNESS WHEREOF, Title has executed and delivered this Joinder Agreement as
of the 1st day April, 1996.


                                   TITLE:
                                   COMMERCIAL PARTNERS TITLE, LLC,

                                   as agent for Chicago Title Insurance Company

                                   By:
                                      -------------------------------------
                                        Its:
                                            -------------------------------




<PAGE>

                                                                 EXHIBIT 4.2b

                          MORTGAGE, SECURITY AGREEMENT,
                           FIXTURE FINANCING STATEMENT
                         ASSIGNMENT OF LEASES AND RENTS

                                      BY

                                   HEI, INC.

                                 AS MORTGAGOR,

                                       TO

                   NORWEST BANK MINNESOTA, NATIONAL ASSOCIATION

                                  AS MORTGAGEE,

                                   TO SECURE
                            $1,482,053 LETTER OF CREDIT

                              Dated: April 1, 1996


Tax statements for the real                    The instrument was drafted by:
property described in this                 
instrument should be sent                      WINTHROP & WEINSTINE, P.A.
to:                                            3200 Minnesota World Trade Center
                                               30 East Seventh Street
                                               Saint Paul, Minnesota 55101

HEI, Inc.
1495 Steiger Lake Lane                         THE MAXIMUM PRINCIPAL
P.O. Box 5000                                  AMOUNTS OF THE OBLIGATIONS
Victoria, Minnesota 55386                      SECURED BY THIS MORTGAGE
                                               IS $1,482,053.

<PAGE>
                                                                 
                          MORTGAGE, SECURITY AGREEMENT,
                         FIXTURE FINANCING STATEMENT AND
                         ASSIGNMENT OF LEASES AND RENTS


THIS MORTGAGE, SECURITY AGREEMENT, FIXTURE FINANCING STATEMENT AND ASSIGNMENT 
OF LEASES AND RENTS (the "Mortgage"), is made as of the 1st day of April, 
1996, by HEI, INC., a Minnesota corporation (the "Mortgagor"), in favor of 
NORWEST BANK MINNESOTA, NATIONAL ASSOCIATION, a national banking association 
(the "Mortgagee").

                              W I T N E S S E T H:

WHEREAS, the City of Victoria, Minnesota (the "Issuer") will issue those 
certain Variable Rate Demand Industrial Development Revenue Bonds, Series 
1996B (HEI, Inc., Project) (the "Bonds"), pursuant to that certain Indenture 
of Trust of even date herewith (the "Indenture"), by and between the Issuer 
and First Trust National Association, as trustee (the "Trustee"); and

WHEREAS, the Issuer will loan the proceeds of the Bonds to the Mortgagor 
pursuant to that certain Loan Agreement of even date herewith by and between 
the Issuer and the Mortgagor (the "Loan Agreement"), for the purpose of 
funding the loan to be made by the Issuer to the Mortgagor to finance the 
construction and installation of the project described therein (the 
"Project"); and

WHEREAS, in order to provide credit and liquidity enhancement with respect to 
the Bonds, the Mortgagor has requested that the Mortgagee issue its 
Irrevocable Letter of Credit No. S404272 for the Mortgagor's account in the 
amount of $1,482,053 for the benefit of the trustee under the terms of the 
indenture (the "Credit"), which shall expire no later than April 1, 2011; and

WHEREAS, as a condition to the issuance of the Credit, the Mortgagee has 
required that the Mortgagor execute that certain Reimbursement Agreement of 
even date herewith for the benefit of the Mortgagee (the "Reimbursement 
Agreement"), which requires, among other things, that the Mortgagor reimburse 
the Mortgagee for any and all draws made under the Credit; and

WHEREAS, the Mortgagee is required as an express condition to issuing the 
Credit pursuant to the Reimbursement Agreement that the Mortgagor secure the 
obligations of the Mortgagor under the Reimbursement Agreement by this 
Mortgage.

NOW THEREFORE, THIS MORTGAGE FURTHER WITNESSETH, that in consideration of the 
Mortgagee issuing the Credit on behalf of the Mortgagor pursuant to the 
Reimbursement Agreement in the original face amount of One Million Four 
Hundred Eighty-Two Thousand Fifty-Three and 00/100 Dollars ($1,482,053.00) 
(the "Mortgage Amount") and other good and lawful consideration, the receipt 
and sufficiency of which are hereby acknowledged, and to secure, and as 
security for, the payment of principal and interest and other premiums, 
penalties and charges on the Reimbursement Agreement and the performance and 
observance by the 

<PAGE>

Mortgagor of all of the covenants, agreements, representations, warranties 
and conditions contained herein, the Mortgagor does hereby grant, bargain, 
sell, convey, assign, transfer, pledge, set over and confirm unto the 
Mortgagee, its successors and assigns, forever, and does hereby grant a 
mortgage lien and security interest to the Mortgagee, its successors and 
assigns, forever, in and to the tract of land legally described in EXHIBIT A 
attached hereto and made a part hereof (hereinafter referred to as the 
"Land");

Together with (a) all of the buildings, structures and other improvements now 
standing or at any time hereafter constructed or placed upon the Land; (b) 
all heating, plumbing and lighting apparatus, elevators and motors, engines 
and machinery, electrical equipment, incinerator apparatus, air-conditioning 
apparatus, water and gas apparatus, pipes, water heaters, refrigerating plant 
and refrigerators, water softeners, carpets, carpeting, storm windows and 
doors, window screens, screen doors, storm sash, window shades or blinds, 
awnings, locks, fences, trees, shrubs, and all other furniture, fixtures, 
machinery, equipment, appliances and personal property of every kind and 
nature whatsoever now or hereafter owned by the Mortgagor and attached or 
affixed to the Land and any improvements located thereon, including all 
extensions, additions, improvements, betterments, renewals and replacements 
of any of the foregoing; (c) all hereditaments, easements, rights, privileges 
and appurtenances now or hereafter belonging, attached or in any way 
pertaining to the Land or to any building, structure or improvement now or 
hereafter located thereon; (d) the immediate and continuing right to receive 
and collect all rents, income, issues and profits now due and which may 
hereafter become due under or by virtue of any lease or agreement (oral or 
written) for the leasing, subleasing, use or occupancy of all or part of the 
Land now, heretofore or hereafter made or agreed to by the Mortgagor; (e) all 
of the leases and agreements described in (d) above, together with all 
guarantees therefor and any renewals or extensions thereof; and (f) all 
insurance and other proceeds of, and all condemnation awards with respect to, 
the foregoing (all of the foregoing is hereinafter collectively referred to 
as the "Mortgaged Property").

The filing of this Mortgage shall constitute a fixture filing in the office 
where it is filed and a carbon, photographic or other reproduction of this 
document may also be filed as a financing statement:

Name and Address of           HEI, Inc.
Debtor and Record             1495 Steiger Lake Lane
Owner of Real Estate:         P. O. Box 5000
                              Victoria, Minnesota 55386
                              Federal Tax Identification Number: 41-0944876

Name and Address of           Norwest Bank Minnesota, National Association
Secured Party:                     Wayzata Office
                                        900 East Wayzata Boulevard
                              Wayzata, Minnesota 55391-2410

                                      -2-

<PAGE>

Description of the Types           See above
(or items) of property
covered by this
financing statement:

Description of real estate         See EXHIBIT A attached
to which all or a part             hereto.
of the collateral is
attached or upon which
it is located:

Some of the above described collateral is or is to become fixtures upon or 
minerals and mineral rights located upon the real estate described on EXHIBIT 
A, and this financing statement is to be filed for record in the public real 
estate records.

AND THE MORTGAGOR, for itself, its successors and assigns, does covenant with 
the Mortgagee, its successors and assigns, that it is lawfully seized of the 
Mortgaged Property and has good right to sell and convey the same; that the 
Mortgaged Property is free from all encumbrances except as may be further 
stated in this Mortgage; that the Mortgagee, its successors and assigns, 
shall quietly enjoy and possess the Mortgaged Property; and that the 
Mortgagor will WARRANT AND DEFEND the title to the same against all lawful 
claims not specifically excepted in this Mortgage.

PROVIDED, NEVERTHELESS, that if the Mortgagor shall pay any and all amounts 
advanced under the Reimbursement Agreement with respect to the Credit, plus 
interest at the rate set forth in the Reimbursement Agreement, as the same 
changes from time to time and is adjusted in the manner set forth in the 
Reimbursement Agreement, on the unpaid principal balance, as computed in 
accordance with the terms and conditions of the Reimbursement Agreement, and 
any other sums due and owing under the Reimbursement Agreement and shall also 
pay or cause to be paid all other sums, with interest thereon, as may be 
advanced by the Mortgagee in accordance with this Mortgage to protect the 
lien of this Mortgage, and shall also keep and perform all and singular the 
covenants herein, required on the part of the Mortgagor to be kept and 
performed (the obligations of the Mortgagor under the Reimbursement 
Agreement, including any and all renewals, amendments, extensions and 
modifications thereof, and all such sums, together with interest thereon, and 
such covenants herein collectively referred to as the "Indebtedness Secured 
Hereby"), and provided the Credit shall either expire or be returned to the 
Mortgagee without a draw being made thereunder, then this Mortgage shall be 
null and void, in which event the Mortgagee will execute and deliver to the 
Mortgagor in form suitable for recording a full satisfaction of this 
Mortgage; otherwise this Mortgage shall remain in full force and effect.

                                   ARTICLE I.
                                        
                    GENERAL COVENANTS, AGREEMENTS, WARRANTIES

                                        -3-

<PAGE>

SECTION I.1.  PAYMENT OF INDEBTEDNESS; OBSERVANCE OF COVENANTS.  The 
Mortgagor shall duly and punctually pay each and every payment of principal, 
interest and all prepayment premiums and late charges, if any, required by 
the Reimbursement Agreement due to amounts advanced under the Credit, and all 
other Indebtedness Secured Hereby, as and when the same shall become due, and 
shall duly and punctually perform and observe all of the covenants, 
agreements and provisions contained herein, in the Reimbursement Agreement or 
in any other instrument given as security for the payment of the 
Reimbursement Agreement.

SECTION I.2.  MAINTENANCE; REPAIRS.  Subject to the provisions of Section 2.3 
hereof, the Mortgagor shall keep and maintain the Mortgaged Property in good 
condition, repair and operating condition free from any waste or misuse, and 
will comply with all material requirements of law, municipal ordinances and 
regulations, restrictions and covenants affecting the Mortgaged Property and 
its use, and will promptly repair or restore any building, improvements or 
structures now or hereafter located on the Land which may become damaged or 
destroyed to their condition prior to any such damage or destruction.  The 
Mortgagor shall not acquiesce in any material rezoning classification, 
modification or restriction affecting the Land, without the prior written 
consent of the Mortgagee, which consent shall not be unreasonably withheld.  
The Mortgagor shall not vacate or abandon the Mortgaged Property.

SECTION I.3.  PAYMENT OF UTILITY CHARGES, TAXES AND ASSESSMENTS.  The 
Mortgagor shall, before any penalty attaches thereto, pay or cause to be paid 
all charges made for electricity, gas, heat, water, sewer and other utilities 
furnished or used in connection with the Mortgaged Property, and all taxes, 
assessments and levies of every nature heretofore or hereafter assessed 
against the Mortgaged Property and upon demand will furnish the Mortgagee 
receipted bills evidencing such payment.

Nothing in this Section 1.3 shall require the payment or discharge of any 
obligations imposed upon the Mortgagor by this Section so long as the 
Mortgagor shall diligently and in good faith and at its own expense contest 
the same or the validity thereof by appropriate legal proceeding which shall 
operate to prevent the collection thereof or other realization thereon and 
the sale or forfeiture of the Mortgaged Property or any part thereof to 
satisfy the same; provided, however, that during such contest the Mortgagor 
shall, at the reasonable request of the Mortgagee, provide security 
satisfactory to the Mortgagee, assuring the discharge of the Mortgagor's 
obligation under this Section and of any additional charge, penalty or 
expense arising from or incurred as a result of such contest; and provided 
further, however, that if at any time payment of any obligation imposed upon 
the Mortgagor by this Section shall become necessary to prevent the delivery 
of a tax deed conveying the Land or any portion thereof because of 
nonpayment, then the Mortgagor shall pay the same in sufficient time to 
prevent the delivery of such tax deed.

SECTION I.4.  LIENS.  Except for liens and encumbrances, if any, listed on 
EXHIBIT B attached hereto or consented to in writing by or granted to the 
Mortgagee ("Permitted Encumbrances"), the Mortgagor will keep the Mortgaged 
Property free from all liens (other than liens for taxes, assessments and 
mechanics' liens not yet due and payable) and encumbrances of every nature 
whatsoever heretofore or hereafter arising and, upon written demand of the 
Mortgagee, the 

                                 -4-

<PAGE>

Mortgagor will pay and procure the release of any such lien or encumbrances.

SECTION I.5.  COMPLIANCE WITH LAW.  The Mortgagor will promptly comply in all 
material respects with all present and future laws, ordinances, rules and 
regulations of any governmental authority affecting the Mortgaged Property 
unless the same is being diligently contested by the Mortgagor in good faith 
and by proper proceedings.

SECTION I.6.  RIGHT OF THE MORTGAGEE TO ENTER.  The Mortgagor will permit the 
Mortgagee and its agents to enter, and to authorize others to enter, upon any 
or all of the Land, at any time and from time to time, during normal business 
hours, to inspect the Mortgaged Property to perform or observe any covenants, 
conditions or terms hereunder which the Mortgagor shall fail to perform, meet 
or comply with, or for any other purpose in connection with the protection or 
preservation of the Mortgagee's security, without thereby becoming liable to 
the Mortgagor or any person in possession under the Mortgage.

SECTION I.7.  RIGHT OF THE MORTGAGEE TO PERFORM.  If the Mortgagor fails to 
pay all and singular any taxes, assessments, levies or other similar charges 
or encumbrances heretofore or hereafter assessed against the Mortgaged 
Property or fails to obtain the release of any lien or encumbrance (other 
than a Permitted Encumbrance) of any nature heretofore or hereafter arising 
upon the Mortgaged Property or fails to perform any other covenants and 
agreements contained in this Mortgage or if any action or proceeding is 
commenced which adversely affects or questions the title to or possession of 
the Mortgaged Property or the interest of the Mortgagor or the Mortgagee 
therein, then the Mortgagee, at the Mortgagee's option, without notice to the 
Mortgagor, may perform such covenants and agreements, investigate and defend 
against such action or proceeding, and take such other action as the 
Mortgagee deems necessary to protect the Mortgagee's interest.  Any amounts 
disbursed by the Mortgagee pursuant to this Section 1.7, including without 
limitation court costs and expenses and attorneys' fees, with interest 
thereon,  shall become additional indebtedness of the Mortgagor and shall be 
secured by this Mortgage.  Such amount shall be payable upon written notice 
from the Mortgagee to the Mortgagor requesting payment thereof, and shall 
bear interest from the date of disbursement at the rate set forth in Section 
4.1 of the Reimbursement Agreement or, if such rate is illegal or usurious, 
at the maximum rate then permitted by law.  Nothing contained in this Section 
1.7 shall require the Mortgagee to incur any expense or to do any act or 
thing hereunder.

SECTION I.8.  ASSUMPTION.  The Mortgagor shall not sell, assign, lease, 
convey, mortgage or otherwise encumber or dispose of either the legal or 
equitable title or both to all or any portion of the Mortgaged Property or 
any other interest therein without the prior written consent of the 
Mortgagee.  

SECTION I.9.  ASSIGNMENT OF RENTS.  The Mortgagor does hereby sell, assign 
and transfer unto the Mortgagee (i) the immediate and continuing right to 
receive and collect all rents, income, issues and profits now due and which 
may hereafter become due under or by virtue of any lease or agreement (oral 
or written) for the leasing, subleasing, use or occupancy of all or any part 
of the Mortgaged Property now, heretofore or hereafter made or agreed to by 
the 

                                     -5-

<PAGE>

Mortgagor, and (ii) all of such leases and agreements, together with all 
guarantees therefor and any renewals or extensions thereof, for the purpose 
of securing payment of the indebtedness of the Mortgagor under the 
Reimbursement Agreement and the documents related thereto.  

The Mortgagor does hereby irrevocably appoint the Mortgagee its true and 
lawful attorney in its name, place and stead, with or without taking 
possession of the Mortgaged Property, to rent, lease, sublease, let or sublet 
all or any portion of the Mortgaged Property to any party or parties at such 
rental and upon such terms, as it in its discretion may determine, and to 
collect all of said avails, rents, income, issues and profits arising from or 
accruing at any time hereafter under each and all of such leases and 
agreements, with the same rights and powers and subject to the same 
immunities, exoneration of liability and rights of recourse and indemnity as 
the Mortgagee would have upon taking possession of the Mortgaged Property.

The Mortgagor represents and agrees that no rent has been or will be paid in 
advance by any persons in possession of all or any portion of the Mortgaged 
Property for a period of more than one month and that the payment of none of 
the rents to accrue for all or any portion of the Mortgaged Property has or 
will be waived, released, reduced or discounted, or otherwise discharged or 
compromised, by the Mortgagor.  The Mortgagor waives any right of setoff 
against any person in possession of all or any portion of the Mortgaged 
Property.  The Mortgagor represents that it has not assigned any of said 
rents or profits to any third party and agrees that it will not so assign any 
of said rents or profits without the prior written consent of the Mortgagee.

Nothing contained herein shall be construed as constituting the Mortgagee "a 
mortgagee in possession" in the absence of the taking of actual possession of 
the Mortgaged Property by the Mortgagee.  In the exercise of the powers  
herein granted to the Mortgagee, no liability shall be asserted or enforced 
against the Mortgagee, all such liability being expressly waived and released 
by the Mortgagor.

The Mortgagor further agrees to assign and transfer to the Mortgagee all 
rents from future leases or subleases upon all or any part of the Mortgaged 
Property and to execute and deliver, immediately upon request of the 
Mortgagee, as such further assurances and assignments in the Mortgaged 
Property as the Mortgagee from time to time shall require.

Although it is the intention of the parties that this assignment of leases 
and rents shall be a present assignment, it is expressly understood and 
agreed that, anything herein contained to the contrary notwithstanding, the 
Mortgagee shall not exercise any of the rights and powers conferred upon it 
herein unless and until an Event of Default shall occur and nothing herein 
contained shall be deemed to affect or impair any rights which the Mortgagee 
may have under the Reimbursement Agreement, this Mortgage or any other 
document or agreement related hereto or thereto.

The Mortgagor acknowledges and agrees that this assignment of leases of 
rents, and the Mortgagee's rights and remedies hereunder, may be enforced by 
the Mortgagee throughout the 

                                    -6-

<PAGE>

entire redemption period provided by applicable law following any foreclosure 
sale of all or any portion of the Mortgaged Property.

At any time after the occurrence of an Event of Default, the Mortgagee, 
without in any way waiving such default, may:

     I.   at the Mortgagee's option without notice to the Mortgagor and without
          regard to the adequacy of the security for the obligations of the
          Mortgagor under the Reimbursement Agreement, either in person or by
          agent, with or without any action or proceeding, or by a receiver
          appointed by a court of competent jurisdiction pursuant to Minnesota
          Statutes, Section 559.17, Subd. 2, peaceably take possession of the
          Mortgaged Property and have, hold, manage, lease, sublease and operate
          the same as a mortgagee in possession; or

     II.  the Mortgagee, without taking possession of the Mortgaged Property,
          may sue for or otherwise collect and receive all rents, income and
          profits from the Mortgaged Property to which the Mortgagor would
          otherwise be entitled, including those past due and unpaid with full
          power to make from time to time all adjustments thereto, as may seem
          proper to the Mortgagee.

The Mortgagee shall not be obligated to perform or discharge, nor does it 
hereby undertake to perform or discharge, any obligation, duty or liability 
under any leases, sublease or rental agreements relating to the Mortgaged 
Property, and the Mortgagor shall and does hereby agree to indemnify and hold 
the Mortgagee harmless from and against any and all liability, loss or damage 
which it may or might incur under any such lease, sublease or agreement or 
under or by reason of the assignment of the rents thereof and from and 
against any and all claims and demands whatsoever which may be asserted 
against it by reason of any alleged obligations or undertakings on its part 
to perform or discharge any of the terms, covenants or agreements contained 
in any of such leases, provided that the Mortgagor shall not indemnify and 
hold harmless the Mortgagee from any liability loss or damage resulting from 
acts or omissions of the Mortgagee which occur on or after the date the 
Mortgagee takes possession of the Mortgaged Property.  Should the Mortgagee 
incur any liability, loss or damage by reason of this assignment of leases 
and rents, or in the defense of any claim or demand, except where such 
liability, loss, damage, claim or demand results from actions or omissions of 
the Mortgagee, the Mortgagor agrees to reimburse the Mortgagee for the amount 
thereof, including costs, expenses and attorney's fees, immediately upon 
demand.

The Mortgagee, or such agent or receiver, in the exercise of the rights and 
powers conferred upon it by this assignment of leases and rents shall have 
the full power to use and apply the avails, rents, issues, income and profits 
of the Mortgaged Property to which the Mortgagor would otherwise be entitled 
to the payment of or on account of the following in the order listed below:

     I.   Reasonable receiver's fees;


                                      -7-

<PAGE>

     II.  Application of tenant security deposits as required by Minnesota
          Statutes, Section 504.20;

     III. Payment, when due, of prior or current real estate taxes or special
          assessments with respect to the Mortgaged Property, or the periodic
          escrow for the payment of the taxes or special assessments;

     IV.  Payment, when due, of premiums for insurance of the type required by
          this Mortgage, or the periodic escrow for the payment of the premiums;
          and

     V.   All expenses for normal maintenance of the Mortgaged Property;

provided, however, that nothing herein shall prohibit the right to reinstate
pursuant to Minnesota Statutes, Section 580.30, or the right to redeem granted
pursuant to Minnesota Statutes, Sections 580.23 and 581.10.

Any excess cash remaining after paying the expenses listed in clauses (I)
through (V) above shall be applied to the payment of the obligations of the
Mortgagor under the Reimbursement Agreement and shall be deemed to be credited
to the amount required to be paid to effect a reinstatement or redemption or, if
the period of redemption ends without redemption, such remaining amounts shall
be paid to the purchaser at the foreclosure sale, its successors or assigns.

The Mortgagor does further specifically authorize and instruct each and every
present and future lessee, sublessee, tenant or subtenant of the whole or any
part of the Mortgaged Property to pay all unpaid rental agreed upon in any lease
or sublease to the Mortgagee upon receipt of demand from the Mortgagee so to pay
the same.

Any tenants, subtenants or other occupants of all or any part of the Mortgaged
Property are hereby authorized to recognize the claims of the Mortgagee
hereunder without investigating the reason for any action taken by the
Mortgagee, or the validity or the amount of indebtedness owing to the Mortgagee,
or the occurrence or existence of any Event of Default, or the application to be
made by the Mortgagee of any amounts to be paid to the Mortgagee.  The sole
signature of any officer or attorney of the Mortgagee shall be sufficient for
the exercise of any rights under this assignment of leases and rents and the
sole receipt of the Mortgagee for any sums received  by such tenants, subtenants
or other occupants shall be a full discharge and release therefor.  Checks for
all or any part of the rentals collected under this Assignment of Leases and
Rents shall be drawn to the exclusive order of the Mortgagee.

SECTION I.10.  FURTHER ASSURANCES.  At any time and from time to time, upon
request by the Mortgagee, the Mortgagor will make, execute and deliver or cause
to be made, executed and delivered, to the Mortgagee, any and all other further
instruments, certificates and other documents as may, in the reasonable opinion
of the Mortgagee, be necessary or desirable in


                                     -8-
<PAGE>

order to effectuate, complete or perfect, or to continue and preserve, the 
obligations of the Mortgagor hereunder and under the Reimbursement Agreement 
and the mortgage and security interest granted by this Mortgage.  Upon any 
failure by the Mortgagor so to do, the Mortgagee may make, execute and record 
any and all such instruments, certificates and documents for and in the name 
of the Mortgagor and the Mortgagor hereby irrevocably appoints the Mortgagee 
its agent and attorney in fact of the Mortgagor so to do.

SECTION I.11.  EXPENSES.  The Mortgagor will pay or reimburse the Mortgagee for
all attorney's fees, costs and expenses incurred by the Mortgagee in any legal
proceeding or dispute of any kind in which the Mortgagee is made a party, or
appears as party plaintiff or defendant, affecting the Indebtedness Secured
Hereby, this Mortgage, the interest created herein or the Mortgaged Property,
including but not limited to the exercise of the power of sale set forth in this
Mortgage, any condemnation action involving the Mortgaged Property or any action
to protect the security hereof and any such amounts paid by the Mortgagee shall
be added to the indebtedness secured by this Mortgage.

SECTION I.12.  BOOKS AND RECORDS; FINANCIAL STATEMENTS.  The Mortgagor will keep
and maintain full, true and accurate books of account adequate to reflect
correctly the results of the operation of the Mortgaged Property, all of which
books and records relating thereto shall be open to inspection by the Mortgagee
or its representative during normal business hours.

SECTION I.13.  HAZARDOUS SUBSTANCES.  The Mortgagor warrants, covenants and
represents that there does not exist in or under the Mortgaged Property any
pollutant, toxic or hazardous waste or substance, or any other material the
release or disposal of which is regulated by any law, regulation, ordinance or
code related to pollution or environmental contamination, and, that no part of
the Mortgaged Property was ever used for any industrial or manufacturing purpose
or as a dump, sanitary landfill, or gasoline service station, and that there
exists on the Mortgaged Property no storage tanks, electrical transformers or
other equipment containing PCBs or material amounts of asbestos.  The Mortgagor
represents that it has received no summons, citations, directives, letters or
other communications, written or oral, from any federal, state or local agency
or department concerning the storing, releasing, pumping, pouring, emitting,
emptying or dumping of any pollutant, toxic or hazardous waste or substance on
the Mortgaged Property.  Notwithstanding anything to the contrary contained
herein, the Mortgagor shall be entitled to utilize hazardous substances at the
Mortgaged Property in the ordinary course of its business provided the Mortgagor
stores, uses and disposes of such hazardous substances in accordance with all
applicable local, state and federal laws, rules and regulations.

The Mortgagor covenants and agrees that it shall not, nor shall it permit others
to, use the Mortgaged Property for the business of generating, transporting,
storing, treating or disposing of any pollutant, toxic or  hazardous waste or
substance, nor shall it either take or fail to take any action which may result
in a release of any hazardous substance from or onto the Mortgaged Property.  In
addition to all rights of access granted the Mortgagee pursuant to Section 1.6
hereof, during the term of the loan contemplated hereby, the Mortgagee, or any
authorized

                                     -9-
<PAGE>

agent, contractor or representative of the Mortgagee, is hereby irrevocably 
authorized to enter upon the Mortgaged Property at any time and from time to 
time for the purpose of performing inspections, taking soil borings or other 
borings, or conducting any other tests or procedures on, in or about the 
Mortgaged Property as the Mortgagee deems necessary or appropriate to 
determine whether any hazardous or toxic substances, including without 
limitation asbestos or PCBs, are present on, under or about the Mortgaged 
Property.

The Mortgagor agrees to indemnify and to hold the Mortgagee harmless from any
and all claims, causes of action, damages, penalties, and costs (including, but
not limited to, attorneys' fees, consultants' fees and related expenses) which
may be asserted against, or incurred by, the Mortgagee resulting from or due to
release of any hazardous substance or waste on the Mortgaged Property or arising
out of any injury to human health or the environment by reason of the condition 
of or past activity upon the Mortgaged Property.  The Mortgagor's duty to
indemnify and hold harmless includes, but is not limited to, proceedings or
actions commenced by any person (including, but not limited to, any federal,
state, or local governmental agency or entity) before any court or
administrative agency.  The Mortgagor further agrees that pursuant to its duty
to indemnify under this section, the Mortgagor shall indemnify the Mortgagee
against all expenses incurred by the Mortgagee as they become due and not
waiting for the ultimate outcome of the litigation or administrative proceeding.
The Mortgagor's obligations to indemnify and hold the Mortgagee harmless
hereunder shall survive repayment of the Mortgage Amount and satisfaction or
foreclosure of this Mortgage.

SECTION 1.14.  TAX ESCROW.  Upon request by the Mortgagee at any time after the
occurrence of an Event of Default, the Mortgagor shall pay to the Mortgagee, on
the day monthly installments of principal and/or interest are payable under the
Reimbursement Agreement, a sum equal to one-twelfth (1/12th) of the annual taxes
and assessments payable with respect to the Mortgaged Property, all as estimated
initially and from time to time determined by the Mortgagee, to be applied by
the Mortgagee to pay said taxes and assessments (such amounts being hereinafter 
referred to as the "Funds").  The Mortgagee shall apply the Funds to pay said
taxes and assessments prior to the date that penalty attaches for non-payment. 
The Funds are hereby pledged as additional security for the Indebtedness Secured
Hereby. No interest shall accrue on the Funds.

If the amount of the Funds held by the Mortgagee shall exceed at any time the
amount deemed necessary by the Mortgagee to provide for the payment of taxes and
assessments, such excess shall, at the option of the Mortgagee, either be
promptly repaid to the Mortgagor or be credited to the Mortgagor on the next
monthly installment of Funds due.  If at any time the Funds are less than the
amount deemed necessary by the Mortgagee to pay taxes and assessments as they
fall due, the Mortgagor shall promptly pay to the Mortgagee any amount necessary
to make up the deficiency upon written notice from the Mortgagee to the
Mortgagor requesting payment thereof.

Upon the occurrence of an Event of Default, the Mortgagee may apply in any order
as the Mortgagee shall determine in its sole discretion, any Funds held by the
Mortgagee at the time of application to pay taxes and assessments which are then
or will thereafter become due or as a


                                     -10-
<PAGE>

credit against the Indebtedness Secured Hereby.  Upon payment in full of all 
Indebtedness Secured Hereby, the Mortgagee shall promptly refund to the 
Mortgagor any Funds held by the Mortgagee.

                                   ARTICLE II.

                   INSURANCE, CONDEMNATION AND USE OF PROCEEDS

SECTION II.1.  INSURANCE.  Until the Indebtedness Secured Hereby has been paid
in full, the Mortgagor shall obtain and maintain the following:

     (1)  The Mortgagor shall keep the buildings, structures, fixtures and other
     improvements now existing or hereafter erected on the Land insured against
     loss by fire, vandalism, and malicious mischief, perils of extended
     coverage, and such other hazards, casualties and contingencies as may be
     specified by the Mortgagee, in an amount not less than the greater of (a)
     the full replacement cost thereof and (b) the full insurable value thereof,
     which in no event shall be less than the amount of Indebtedness Secured
     Hereby, and naming the Mortgagee as mortgagee and loss payee.  The
     Mortgagor shall also maintain rent loss or business interruption insurance
     with respect to such exposures and perils in an amount sufficient to enable
     the Mortgagor to make the required monthly payments under the Reimbursement
     Agreement, to pay taxes and insurance and to continue operations during an 
     assumed reconstruction period of one (1) year, naming the Mortgagee as
     mortgagee and loss payee.  The Mortgagor shall also maintain comprehensive
     general public liability insurance providing for limits of coverage of not
     less than $1,000,000 combined single limit coverage, and naming the
     Mortgagee as an additional insured.  The Mortgagor shall also maintain such
     insurance as is required by the Reimbursement Agreement.

     (2)  All insurance shall be carried in companies licensed to do business in
     the State of Minnesota and approved by the Mortgagee and the policies and
     renewals thereof shall (i) contain a waiver of defense based on
     coinsurance, (ii) be constantly assigned and pledged to and held by the
     Mortgagee as additional security for the Indebtedness Secured Hereby, (iii)
     have attached thereto loss-payable clauses in favor of and in form
     acceptable to the Mortgagee, and (iv) provide that the Mortgagee shall
     receive at least thirty (30) days' prior written notice of cancellation or
     any substantial modification of the policy.  In default thereof, the
     Mortgagee may effect any insurance required to be maintained by the
     Mortgagor pursuant to this Section 2.1 and the amount paid therefor shall
     become immediately due and payable with interest at the rate set forth in
     Section 4.1 of the Reimbursement Agreement, or, if such rate is illegal or
     usurious, at the maximum rate permitted by law, and shall be  secured by
     this Mortgage.  In the event of loss or damage to the Mortgaged Property,
     the Mortgagor will give immediate written notice thereof to the Mortgagee,
     who may make proof of loss or damage if not made promptly by the Mortgagor.
     The Mortgagor hereby authorizes the Mortgagee to settle and compromise all
     claims on such policies and hereby authorizes and directs each insurance
     company 


                                        -11-

<PAGE>

     concerned to make payment for any such loss to the Mortgagor and the 
     Mortgagee jointly.  In the event of foreclosure of this Mortgage, all
     right, title and interest of the Mortgagor in and to any property insurance
     policies then in force shall pass to the purchaser at the foreclosure sale.

SECTION II.2.  CONDEMNATION.  The Mortgagor shall give the Mortgagee immediate
written notice of the actual or threatened commencement of any proceedings under
condemnation or eminent domain affecting all or any part of the Mortgaged
Property or any easement therein or appurtenance thereof.  If all or any part of
the Mortgaged Property is damaged, taken or acquired, either temporarily or
permanently, in any condemnation proceeding, or by exercise of the right of
eminent domain, the amount of any award or other payment for such taking,
acquisition or damages made in consideration thereof, to the extent of the full
amount of the remaining unpaid indebtedness secured by this instrument, is
hereby assigned to the Mortgagee, who is empowered to collect and receive the
same and to give proper receipts therefor in the name of the Mortgagor and the
same shall be paid forthwith to the Mortgagee, to be applied to the Indebtedness
Secured Hereby, and any excess shall be paid to the Mortgagor.  Provided no
Event of Default has occurred and is then continuing, the Mortgagor shall be
entitled to settle and compromise all claims for condemnation awards (to be
applied in accordance with the terms of the immediately preceding sentence)
where the amount claimed is less than $50,000.  

SECTION II.3.  THE MORTGAGOR TO REPAIR, REPLACE, REBUILD OR RESTORE.  If any
Indebtedness Secured Hereby is outstanding when all or any part of the Mortgaged
Property is destroyed or damaged, unless the Mortgagee elects, at its option,
which option is hereby irrevocably granted by the Mortgagor to the Mortgagee, to
deposit such proceeds in the cash collateral account established pursuant to the
terms of the Reimbursement Agreement, to be applied pursuant to the terms of the
Reimbursement Agreement:

     (1)  the Mortgagor shall either deposit such proceeds in the cash
     collateral account established pursuant to the terms of the Reimbursement
     Agreement, to be applied pursuant to the terms of the Reimbursement
     Agreement, or proceed promptly, subject to the provisions of subsection (2)
     of this Section 2.3, to replace, repair, rebuild and restore the Mortgaged
     Property to substantially the same condition as existed before the taking
     or event causing the damage or destruction; 

     (2)  all proceeds of any insurance claim shall be paid directly to the
     Mortgagee.  The Mortgagee shall apply the proceeds, less such sum, if any,
     required for payment of all expenses incurred in collecting the same (the
     "Net Proceeds"), to payment of the costs of repair, replacement, rebuilding
     or restoration of the Mortgaged Property upon compliance with such
     construction and disbursement terms as the Mortgagee may deem reasonably
     necessary, including deposit by the Mortgagor with the Mortgagee of such
     funds of the Mortgagor as may be  required to insure payment of all costs
     of rebuilding, restoration, repair or replacement.  If such deposit is not
     made when requested by the Mortgagee, or if an Event of Default occurs
     while the Mortgagee is retaining the Net Proceeds, the Mortgagee may apply
     the Net Proceeds to the Indebtedness Secured 

                                     -12-
<PAGE>

     Hereby.  The balance of the Net Proceeds remaining after payment of all 
     costs of any repair, rebuilding, replacement or restoration of the 
     Mortgaged Property shall be applied as a prepayment of the Indebtedness 
     Secured Hereby, and any excess shall be paid to the Mortgagor; and

     (3)  the Mortgagor shall not, by reason of the payment of any costs of
     repair, rebuilding, replacement or restoration, be entitled to any
     reimbursement from the Mortgagee or any abatement or diminution of the
     amounts payable under the Reimbursement Agreement or on any other
     Indebtedness Secured Hereby.

Notwithstanding the foregoing, and provided no Event of Default has occurred and
is then continuing, the Mortgagor shall be entitled to directly apply insurance
proceeds to the repair, replacement, rebuilding or restoration of the Mortgaged
Property as long as such damage or destruction is in an amount of less than
$50,000.

                                  ARTICLE III.

                                    REMEDIES

SECTION III.1.  REMEDIES.  Upon the occurrence of an Event of Default or at any
time thereafter, the Mortgagee may, at its option, exercise any and all of the
following rights and remedies (and any other rights and remedies available to it
under applicable law or any document related hereto):

     (1)  the Mortgagee shall be entitled to seek immediate appointment of a
     receiver for the Mortgaged Property; and 

     (2)  the Mortgagee may foreclose this Mortgage by action or advertisement
     upon written notice thereof to the Mortgagor, and the Mortgagor hereby
     authorizes the Mortgagee to do so, power being herein expressly granted to
     sell the Mortgaged Property at public auction without any prior hearing
     thereof and to convey the same to the purchaser, in fee simple, pursuant to
     the statutes of Minnesota in such case made and provided and, out of the
     proceeds arising from such sale, to pay all Indebtedness Secured Hereby
     with interest, and all legal costs and charges of such foreclosure and the
     maximum attorney's fees permitted by law, which costs, charges and fees the
     Mortgagor herein agrees to pay, and to pay the surplus, if any, to the
     Mortgagor, its successors or assigns; and

     (3)  the Mortgagee may exercise any of the remedies made available to a
     secured party under the Uniform Commercial Code in effect in the State of
     Minnesota, or other applicable law, with respect to any of the Mortgaged
     Property which constitutes personal property, including without limitation
     the right to take possession thereof, proceeding without judicial process
     or by judicial process (without a prior hearing or notice thereof, which
     the Mortgagor hereby waives), and the right to sell, lease or otherwise
     dispose of

                                     -13-
<PAGE>

     or use any or all of such personal property.  The Mortgagee may
     require the Mortgagor to assemble such personal property and make it
     available to the Mortgagee at a place designated by the Mortgagee which is
     reasonably convenient to both the Mortgagor and the Mortgagee.  If notice
     to the Mortgagor of any intended disposition of any of the Mortgaged
     Property constituting personal property or any other intended action is
     required by law in a particular instance, such notice shall be deemed
     commercially reasonable if given (in the manner specified in Section 4.2
     hereof) at least ten (10) calendar days prior to the date of intended
     disposition or other action.

In the event of a sale under this Mortgage, whether by virtue of judicial
proceedings or otherwise, the Mortgaged Property may, at the option of the
Mortgagee, be sold as one parcel and as an entirety or in such parcels, manner
and order as the Mortgagee in its sole discretion may elect.

SECTION III.2.  PURCHASE OF MORTGAGED PROPERTY.  In case of any sale of the
Mortgaged Property pursuant to any judgment or decree of any court or otherwise
in connection with the enforcement of any of the terms of this Mortgage, the
Mortgagee, its successors and assigns, may become the purchaser, and for the
purpose of making settlement for or payment of the purchase price, shall be
entitled to turn in and use the Reimbursement Agreement and any claims for
interest, late charges and prepayment premiums matured and unpaid thereon,
together with any other Indebtedness Secured Hereby, if any, in order that there
may be credited as paid on the purchase price the sum, or any part thereof, then
due under the Reimbursement Agreement, including principal thereof and interest,
late charges and prepayment premiums, if any, thereon, and any other
Indebtedness Secured Hereby.

                                   ARTICLE IV.

                                  MISCELLANEOUS

SECTION IV.1.  SUCCESSORS AND ASSIGNS.  The covenants and agreements contained
herein, including, without limitation, the provision of Section 1.8 hereof,
shall bind, and the rights hereunder shall inure to, the respective heirs,
successors and assigns of the Mortgagor and the Mortgagee, including among the
Mortgagor's assigns any purchasers or transferees of the Mortgaged Property.

SECTION IV.2.  NOTICES.  Any notice, request, demand or other communication
permitted or required hereunder shall be deemed duly given if delivered or
mailed postage prepaid, certified or registered, addressed to the address of
such party on page 2 of this Mortgage.

SECTION IV.3.  HEADINGS.  The headings of the sections contained herein are for
convenience only and are not to be construed to be a part of or limit or affect
the terms hereof.

SECTION IV.4.  EXPENSES.  The Mortgagor shall reimburse the Mortgagee and any
participant, upon demand, for all reasonable costs and expenses, including
without limitation 

                                     -14-
<PAGE>

attorneys' fees, appraisal fees, survey fees, closing charges, documentary or 
tax stamps, recording and filing fees, insurance premiums and service 
charges, paid or incurred by the Mortgagee in connection with (i) the 
preparation, negotiation, approval, execution and delivery of the 
Reimbursement Agreement, this Mortgage and any other documents and 
instruments related hereto or thereto; (ii) the servicing of the loan 
contemplated by the Reimbursement Agreement; (iii) the negotiation of any 
amendments or modifications to any of the foregoing documents, instruments or 
agreements and the preparation of any and all documents necessary or 
desirable to effect such amendments or modifications; and (iv) the 
enforcement by the Mortgagee during the term hereof or thereafter of any of 
the rights or remedies of the Mortgagee or any participant hereunder or under 
any of the foregoing documents, instruments or agreements, including without 
limitation costs and expenses of collection, whether or not suit is filed 
with respect thereto and  whether such costs are paid or incurred, or to be 
paid or incurred, prior to or after entry of judgment.

SECTION IV.5.  DEFINITIONS.  As used herein, the term "Event of Default" shall
have the meaning assigned to such term in the Reimbursement Agreement.

IN WITNESS WHEREOF, the Mortgagor has caused this Mortgage to be duly executed
and delivered to the Mortgagee as of the day and year first above written.

                                       HEI, INC.

                                       By:
                                          -------------------------------------
                                          Its:
                                              ---------------------------------


                                       By:
                                          -------------------------------------
                                       Its:
                                           ------------------------------------





                                     -15-
<PAGE>

STATE OF MINNESOTA       )
                         ) ss
COUNTY OF                )


The foregoing instrument was acknowledged before me this ____ day of March,
1996, by _________________________, the ________________, and by
_________________________, the _____________________, of HEI, Inc., a Minnesota
corporation, for and on behalf of said corporation.

                                      -----------------------------------------
                                      Notary Public


                                     -16-


<PAGE>

                                    EXHIBIT A

                               (Legal Description)

Lot 2, Block 1, Point Victoria, according to the recorded plat thereof, 
Carver County, Minnesota.


<PAGE>

                                    EXHIBIT B

                            (Permitted Encumbrances)


1.  Easement for utilities and drainage as shown on the recorded plat.

2.  The former County Highway No. 113 adjacent to subject property has been
    revoked as a county highway and is now under the jurisdiction of the City
    of Victoria, a shown by Resolution Revoking County Highway dated April 25,
    1989, filed May 23, 1989 as Document No. T61038.

<PAGE>



                            SECURITY AGREEMENT


THIS SECURITY AGREEMENT, is made as of this 1st day of April, 1996, by HEI, 
INC., a Minnesota corporation ("Debtor"), in favor of NORWEST BANK MINNESOTA, 
NATIONAL ASSOCIATION, a national banking association ("Secured Party").

In order to secure the payment and performance of Debtor of all of its 
obligations under and pursuant to that certain Reimbursement Agreement of 
even date herewith (the "Reimbursement Agreement") by and between Debtor and 
Secured Party (such obligations are herein collectively referred to as the 
"Secured Obligations"), Debtor hereby agrees as follows:

1.   SECURITY INTEREST AND COLLATERAL.  In order to secure the payment and 
performance of the Secured Obligations, Debtor hereby grants to Secured Party 
a security interest (herein called the "Security Interest") in and to the 
following property (hereinafter collectively referred to as the "Collateral"):

          any and all equipment now owned or hereafter acquired by the
          Debtor and wherever located, 

together with all substitutions and replacements for and products and 
proceeds of any of the foregoing property and all accessories, attachments, 
parts, accessions and repairs now or hereafter attached or affixed to or used 
in connection with any such equipment.

2.   REPRESENTATIONS, WARRANTIES AND AGREEMENTS.  Debtor hereby represents 
and warrants to, and covenants and agrees with, Secured Party as follows:

     (a)  The Collateral will be used primarily for business purposes.  The
     Collateral shall be located within the State of Minnesota.

     Debtor's chief executive office is located at 1495 Steiger Lake Lane,
     Victoria, Minnesota, and it keeps and will keep all of its books and
     records with respect to all of its accounts at such address.

     (b)  If any part or all of the Collateral will become so related to
     particular real estate as to become a fixture, the Debtor will promptly
     advise the Secured Party as to real estate concerned and the record owner
     thereof and execute and deliver any and all instruments necessary to
     perfect the Security Interest therein and to assure that such Security
     Interest will be prior to the interest therein of the owner of the real
     estate.

     (c)  During the preceding one (1) year Debtor has not changed its name or
     operated or conducted business under any trade name or "d/b/a" which is
     different from its corporate name.  Debtor shall promptly notify Secured
     Party of any change in such name or if it operates or conducts business
     under any trade name or "d/b/a" which is different from such name.

<PAGE>

     (d)  Debtor has (or will have at the time Debtor acquires rights in
     Collateral hereafter acquired or arising) and will maintain absolute title
     to each item of Collateral free and clear of all security interests, liens
     and encumbrances, except the Security Interest, liens granted to secure the
     acquisition of items of Collateral (other than items of Collateral acquired
     through proceeds of the Reimbursement Agreement), capitalized leases, and
     such other liens and encumbrances as are consented to in writing by Secured
     Party (the Security Interest and such other liens and encumbrances are
     hereinafter collectively referred to as the "Permitted Interests"), and
     will defend the Collateral against all claims or demands of all persons
     other than Secured Party and those holding Permitted Interests.  Debtor
     will not sell or otherwise dispose of the Collateral or any interest
     therein where the book value of such Collateral is greater than $5,000
     without the prior written consent of Secured Party.

     (e)  Debtor will not permit any Collateral to be located in any state (and,
     if a county filing is required, in any county) in which a financing
     statement covering such Collateral is required to be, but has not in fact
     been, filed.

     (f)  Debtor will (i) promptly pay all taxes and other governmental charges
     levied or assessed upon or against any Collateral or upon or against the
     creation, perfection or continuance of the Security Interest; (ii) keep all
     Collateral free and clear of all security interests, liens and encumbrances
     except the Permitted Interests; (iii) at all reasonable times, permit
     Secured Party or its representatives to examine or inspect any Collateral,
     wherever located, and to examine, inspect and copy Debtor's books and
     records pertaining to the Collateral and its business and financial
     condition; (iv) keep accurate and complete records pertaining to the
     Collateral and pertaining to Debtor's business and financial condition and 
     will submit to Secured Party such periodic reports concerning the
     Collateral and Debtor's business and financial condition as Secured Party
     may from time to time reasonably request; (v) promptly notify Secured Party
     of any loss or material damage to any Collateral; (vi) at all times keep
     all Collateral insured against risks of fire (including so called extended 
     coverage), theft and such other risks and in such amounts as Secured Party
     may reasonably request, with any loss payable to Secured Party to the
     extent of its interest and notify the Secured Party in writing of any loss
     or damage to the Collateral or any part; (vii) from time to time execute
     such financing statements as Secured Party may reasonably deem required to
     be filed in order to perfect the Security Interest and, if any Collateral
     is covered by a certificate of title, execute such documents as may be
     required to have the Security Interest properly noted on a certificate of
     title; (viii) pay when due or reimburse Secured Party on demand for all
     costs of collection of any of the Secured Obligations and all other
     out-of-pocket expenses (including in each case all attorneys' fees)
     incurred by Secured Party in connection with the creation, perfection,
     satisfaction or enforcement of the Security Interest or the execution or
     creation, continuance or enforcement of this Agreement or any or all of the
     Secured Obligations including expenses incurred in any litigation or
     bankruptcy or insolvency proceedings; (ix) execute, deliver or endorse any
     and all instruments, documents, 

                                         -2-

<PAGE>

     assignments, security agreements and other agreements and writings which
     Secured Party may at any time reasonably request in order to secure, 
     protect, perfect or enforce the Security Interest and Secured Party's 
     rights under this Agreement; (x) not use or keep any Collateral, or permit
     it to be used or kept, for any unlawful purpose or in violation of any 
     federal, state or local law, statute or ordinance; and (xi) not permit any
     Collateral to become part of or to be affixed to any real property, without
     first assuring to the reasonable satisfaction of Secured Party that the 
     Security Interest will be prior and senior to any interest or lien then 
     held or thereafter acquired by any mortgagee of such real property or the
     owner or purchaser of any interest therein.  If Debtor at any time fails 
     to perform or observe any agreement contained in this Section 2(f), and if
     such failure shall continue for a period of ten (10) calendar days after 
     Secured Party gives Debtor written notice thereof (or, in the case of the 
     agreements contained in clauses (vi) and (vii) of this Section 2(f), 
     immediately upon the occurrence of such failure, without notice or lapse 
     of time) Secured Party may (but need not) perform or observe such agreement
     on behalf and in the name, place and stead of Debtor (or, at Secured 
     Party's option, in Secured Party's own name) and may (but need not) take 
     any and all other actions which Secured Party may reasonably deem necessary
     to cure or correct such failure (including, without limitation, the payment
     of taxes, the satisfaction of security interests, liens or encumbrances 
     (other than Permitted Interests), the procurement and maintenance of 
     insurance, the execution of financing statements, the endorsement of 
     instruments, and the procurement of repairs, transportation or insurance);
     and, except to the extent that the effect of such payment would be to 
     render any loan or forbearance of money usurious or otherwise illegal under
     any applicable law, Debtor shall thereupon pay Secured Party on demand the
     amount of all moneys expended and all costs and expenses (including 
     attorneys' fees) incurred by Secured Party in connection with or as a 
     result of Secured Party's performing or observing such agreements or 
     taking such actions, together with interest thereon from the date expended
     or incurred by Secured Party at the rate set forth in Section 4.1 of the 
     Reimbursement Agreement or, if such rate is illegal or usurious, at the 
     maximum rates permitted by law.  To facilitate the performance or 
     observance by Secured Party of such agreements of Debtor, Debtor hereby
     irrevocably appoints (which appointment is coupled with an interest) 
     Secured Party, or its delegate, as the attorney-in-fact of Debtor
     with the right (but not the duty) from time to time to create, prepare,
     complete, execute, deliver, endorse or file, in the name and on behalf of
     Debtor, any and all instruments, documents, financing statements,
     applications for insurance and other agreements and writings required to be
     obtained, executed, delivered or endorsed by Debtor under this Section 2.

3.   ASSIGNMENT OF INSURANCE.  Debtor hereby assigns to Secured Party, as 
additional security for the payment of the Secured Obligations, any and all 
moneys (including but not limited to proceeds of insurance and refunds of 
unearned premiums) due or to become due under, and all other rights of Debtor 
under or with respect to, any and all policies of insurance covering the 
Collateral, and Debtor hereby directs the issuer of any such policy to pay 
any such moneys to the Secured Party.  Before and upon the occurrence of an 
Event of Default (as that term is defined in the Reimbursement Agreement), 
and at any time thereafter, Secured Party may 

                                    -3-

<PAGE>

(but need not) in its own name or in Debtor's name, execute and deliver 
proofs of claim, receive all such moneys (subject to Debtor's rights), 
endorse checks and other instruments representing payment of such monies, and 
adjust, litigate, compromise or release any claim against the issuer of any 
such policy.  Notwithstanding the foregoing, and provided no Event of Default 
has occurred and is then continuing, Debtor shall be entitled to directly 
settle and compromise claims where the amount of the claim is less than 
$10,000 without the consent of Secured Party.

4.   REMEDIES.  Upon the occurrence and during the continuance of an Event of 
Default, Secured Party may exercise any one or more of the following rights 
or remedies if any or all of the Secured Obligations are not paid when due: 
(i) exercise and enforce any or all rights and remedies available after 
default to a secured party under the Uniform Commercial Code, including but 
not limited to the right to take possession of any Collateral, proceeding 
without judicial process or by judicial process (without a prior hearing or 
notice thereof, which Debtor hereby expressly waives), and the right to sell, 
lease or otherwise dispose of or use any or all of the Collateral; (ii) 
Secured Party may require Debtor to assemble the Collateral and make it 
available to Secured Party at a place to be designated by Secured Party which 
is reasonably convenient to both parties; and (iii) exercise or enforce any 
or all other rights or remedies available to Secured Party by law or 
agreement against the Collateral, against Debtor or against any other person 
or property.  If notice to Debtor of any intended disposition of Collateral 
or any other intended action is required by law in a particular instance, 
such notice shall be deemed commercially reasonable if given (in the manner 
specified in Section 5 hereof) at least ten (10) calendar days prior to the 
date of intended disposition or other action.

5.   MISCELLANEOUS.  This Agreement can be waived, modified, amended, 
terminated or discharged, and the Security Interest can be released, only 
explicitly in a writing signed by Secured Party. A waiver signed by Secured 
Party shall be effective only in the specific instance and for the purpose 
given. Mere delay or failure to act shall not preclude the exercise or 
enforcement of any of Secured Party's rights or remedies. All rights and 
remedies of Secured Party shall be cumulative and may be exercised singularly 
or concurrently, at Secured Party's option, and the exercise or enforcement 
of any one such right or remedy shall neither be a condition to nor bar the 
exercise or enforcement of any other. All notices to be given to Debtor shall 
be deemed sufficiently given if deposited in the United States mails, 
registered or certified, postage prepaid, or personally delivered to Debtor 
at its address set forth in Section 2(a) hereof.  Secured Party's duty of 
care with respect to Collateral in its possession (as imposed by law) shall 
be deemed fulfilled if Secured Party exercises reasonable care in physically 
safe keeping such Collateral or, in the case of Collateral in the custody or 
possession of a bailee or other third person, exercises reasonable care in 
the selection of the bailee or other third person, and Secured Party need not 
otherwise preserve, protect, insure or care for any Collateral. Secured Party 
shall not be obligated to preserve any rights Debtor may have against any 
other party, to realize on the Collateral at all or in any  particular manner 
or order, or to apply any cash proceeds of Collateral in any particular order 
of application.  This Agreement shall be binding upon and inure to the 
benefit of Debtor and Secured Party and their respective heirs, 
representatives, successors and assigns and shall take effect when signed by 
Debtor and delivered to Secured Party, and Debtor waives notice of Secured 
Party's acceptance hereof. Secured Party may execute this Agreement 

                                   -4-

<PAGE>

if appropriate for the purpose of filing, but the failure of Secured Party to 
execute this Agreement shall not affect or impair the validity or 
effectiveness of this Agreement. Except to the extent otherwise required by 
law, this Agreement shall be governed by the laws of the State of Minnesota 
and, unless the context otherwise requires, all terms used herein which are 
defined in Articles 1 and 9 of the Uniform Commercial Code, as in effect in 
said state, shall have the meanings therein stated.  If any provision or 
application of this Agreement is held unlawful or unenforceable in any 
respect, such illegality or unenforceability shall not affect other 
provisions or applications which can be given effect, and this Agreement 
shall be construed as if the unlawful or unenforceable provision or 
application had never been contained herein or prescribed hereby. All 
representations and warranties contained in this Agreement shall survive the 
execution, delivery and performance of this Agreement and the creation and 
payment of the Secured Obligations.

IN WITNESS WHEREOF, Debtor has executed and delivered to Secured Party this 
Security Agreement as of the day and year first above written.

                                   HEI, INC.


                                   By:
                                      --------------------------
                                      Its:
                                          ----------------------

                                   By:
                                      --------------------------
                                      Its:
                                          ----------------------


                                      -5-


<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          AUG-31-1996
<PERIOD-START>                             SEP-01-1995
<PERIOD-END>                               JUN-01-1996
<CASH>                                           1,218
<SECURITIES>                                         0
<RECEIVABLES>                                    1,999
<ALLOWANCES>                                         0
<INVENTORY>                                      2,415
<CURRENT-ASSETS>                                10,993
<PP&E>                                          10,612
<DEPRECIATION>                                   4,802
<TOTAL-ASSETS>                                  20,116
<CURRENT-LIABILITIES>                            2,108
<BONDS>                                          5,322
                                0
                                          0
<COMMON>                                           202
<OTHER-SE>                                      12,212
<TOTAL-LIABILITY-AND-EQUITY>                    20,116
<SALES>                                         14,283
<TOTAL-REVENUES>                                14,283
<CGS>                                           10,885
<TOTAL-COSTS>                                   10,885
<OTHER-EXPENSES>                                 2,154
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                  1,244
<INCOME-TAX>                                       460
<INCOME-CONTINUING>                                784
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                       784
<EPS-PRIMARY>                                      .19
<EPS-DILUTED>                                      .19
        

</TABLE>


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