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EXHIBIT 4.2  

  
      CAPITAL EXPENDITURE NOTE         

	Executed as of the 31st of July, 2000	 	Amount $1,665,000

    FOR VALUE RECEIVED, the undersigned ("Borrower"), hereby promises to pay to the order of LASALLE BUSINESS
CREDIT, INC., a Delaware corporation ("Lender"), in such coin or currency of the United States which shall be legal tender in payment of all debts and dues, public and
private, at the time of payment, the principal sum of ONE MILLION SIX HUNDRED SIXTY-FIVE THOUSAND AND 00/100 DOLLARS ($1,665,000.00),
together with interest from and after the date hereof on the unpaid principal balance outstanding at the Prime Rate plus One-Fourth Percent (0.25%), as the same changes in accordance with
this Note, or as otherwise set forth in the Loan and Security Agreement between Borrower and Lender dated the same date hereof ("Loan Agreement"). 

    This
Capital Expenditure Note ("Note") is one of the Capex Notes referred to in, and is issued pursuant to, the Loan Agreement and is entitled to all of the benefits and security of
the Loan Agreement. All of the terms, covenants and conditions of the Loan Agreement and all other instruments evidencing or securing the indebtedness hereunder are hereby made a part of this Note and
are deemed incorporated herein in full. All capitalized terms used herein, unless otherwise specifically defined in this Note, shall have the meanings ascribed to them in the Loan Agreement. 

    Borrower
acknowledges and understands that the Prime Rate merely serves as a basis upon which effective rates of interest are calculated for loans making reference to the per annum
rate of interest publicly announced by LaSalle National Bank at its office in Chicago, Illinois, from time to time as its Prime Rate for commercial loans and that such rate may not be the lowest or
best rate at which such bank calculates interest or extends credit. The Prime Rate as of the date of this Note is Nine and One-Half Percent (9.50%) per annum and, accordingly, the interest
rate in effect hereunder as of the date hereof, expressed in simple interest terms, is Nine and Three-Fourths Percent (9.75%). After the date hereof, the rate of interest in effect hereunder shall be
increased or decreased, as the case may be, by an amount equal to any increase or decrease in the Prime Rate, with such adjustments to be effective as of the opening of business on the date that any
such change in the Prime Rate becomes effective. The Prime Rate in effect on the date hereof shall be the Prime Rate effective as of the opening of business on the date hereof, but if this Note is
executed on a day that is not a business day,
the Prime Rate in effect on the date hereof shall be the Prime Rate effective as of the opening of business on the last business day immediately preceding the date hereof. Interest hereunder shall be
computed on the basis of actual days elapsed over the period of a 360-day year. If any Event of Default shall occur then, at Lender's option, the outstanding principal balance of this Note
shall bear interest from and after the occurrence of such Event of Default at a variable rate per annum equal to the default rate set forth in the Loan Agreement until either the Event of Default is
cured with Lender's permission and to Lender's satisfaction or the principal balance of this Note is paid in full. 

    In
no contingency or event whatsoever, whether by reason of advancement of the proceeds hereof or otherwise, shall the amount paid or agreed to be paid to Lender for the use,
forbearance or detention of money advanced hereunder exceed the Highest Lawful Rate permissible under any law which a court of competent jurisdiction may deem applicable hereto. 

    Regardless
of any provision contained herein, the holder hereof shall never be entitled to receive, collect, or apply as interest on this Note, any amount in excess of the Highest
Lawful Rate and, in the event the holder hereof ever receives, collects, or applies as interest, any such excess, such amount which would be excessive interest shall be deemed a partial prepayment of
principal and treated hereunder as such; and, if the principal hereof is paid in full, any remaining excess shall forthwith be paid to the Undersigned. In determining whether or not the interest paid
or payable, under any specific contingency, exceeds the Highest Lawful Rate, the Undersigned and the holder hereof shall, to the maximum extent permitted under applicable law, (a) treat all
advances hereunder as but a single extension of credit, (b) characterize any nonprincipal payment as an expense, fee, or premium rather 

than as interest, (c) exclude voluntary prepayments and the effects thereof, and (d) "spread" the total amount of interest throughout the entire contemplated term hereof;  provided that, if the
principal hereof is paid in full prior to the end of the full contemplated term hereof, and if the interest received for the
actual period of existence thereof exceeds the Highest Lawful Rate, the holder hereof shall refund to the Undersigned the amount of such excess, and, in such event, the holder hereof shall not be
subject to any penalties provided by any laws for contracting for, charging, taking, reserving, or receiving interest in excess of the Highest Lawful Rate. As used herein, the term the "Highest Lawful
Rate" means the maximum rate of interest (or, if the context so requires, an amount calculated at such rate) which the holder hereof is allowed to contract for, charge, take, reserve, or receive under
applicable law after taking into account, to the extent required by applicable law, any and all relevant payments or charges made in connection with this Note. 

    For
so long as no Event of Default shall have occurred under the Loan Agreement, the principal amount and accrued interest of this Note shall be due and payable on the dates and in
the manner hereinafter set forth: 

	(a)
	Interest
shall be due and payable monthly, in arrears, on the first day of each month, commencing on August 1, 2000, and continuing until such time as the full principal
balance, together with all other amounts owing hereunder, shall have been paid in full;

	(b)
	Commencing
on September 1, 2000, and continuing on the first day of each month thereafter to and including the first day of August, 2005, principal payments in the amount of
TWENTY SEVEN THOUSAND SEVEN HUNDRED FIFTY AND 00/100 DOLLARS ($27,750.00) each;

	(c)
	On
August 1, 2005, a final principal payment equal to the entire unpaid principal balance hereof, together with any and all other amounts due hereunder. 

    Any
payments applied to principal under this Note are intended to permanently reduce the outstanding amount of the Note and may not be re-borrowed. Notwithstanding the
foregoing, the entire unpaid principal balance and accrued interest on this Note shall be due and payable immediately upon any termination of the Loan Agreement. Borrower may voluntarily prepay this
Note in whole at any time, from time to time, provided that such prepayment shall be made together with accrued interest on the principal amount so prepaid at the prepayment date plus the early
termination fee as set forth in the Loan Agreement. 

    The
occurrence of an Event of Default under the Loan Agreement, including the failure to pay any installment of principal or interest in full on the due date thereof in accordance
with the terms of this Note, shall constitute an event of default under this Note and shall entitle Lender, at its option, to declare the then outstanding principal balance and accrued interest hereof
to be, and the same shall thereupon become, immediately due and payable without notice to or demand upon Borrower, all of which Borrower hereby expressly waives. If this Note is collected by or
through an attorney at law, then Borrower shall be obligated to pay, in addition to the principal balance and accrued interest hereof, reasonable attorney's fees, not to exceed Fifteen Percent (15%)
of such principal and interest, and court costs. 

    Borrower
represents and warrants that the proceeds of this note are to be used by Borrower exclusively for non-consumer purposes. 

    Time
is of the essence of this Note. To the fullest extend permitted by applicable law, Borrower, for itself and its legal representatives, successors and assigns, expressly waives
presentment, demand, protest, notice of dishonor, notice of non-payment, notice of maturity, notice of protest, presentment for the purpose of accelerating maturity, diligence in
collection, and the benefit of any exemption or insolvency laws. 

2

    Wherever possible each provision of this Note shall be interpreted in such a manner as to be effective and valid under applicable law, but if any provision of this Note shall be
prohibited or invalid under applicable law, such provision shall be ineffective to the extent of such prohibition or invalidity without invalidating the remainder of such provision or remaining
provisions of this Note. No delay or failure on the part of Lender in the exercise of any right or remedy hereunder shall operate as a waiver thereof, nor as an acquiescence in any default, nor shall
any single or partial exercise by Lender of any right or remedy preclude any other right or remedy. Lender, at its option, may enforce its rights against any collateral securing this Note without
enforcing its rights against Borrower, any guarantor of the indebtedness evidenced hereby or any other property or indebtedness due or to become due to Borrower. Borrower agrees that, without
releasing or impairing Borrower's liability hereunder, Lender may at any time release, surrender, substitute or exchange any collateral securing this Note and may at any time release any party
primarily or secondarily liable for the indebtedness evidenced by this Note. 

    This
Note shall be governed by, and construed and enforced in accordance with, the laws of the State of Illinois, and is intended to take effect as an instrument under seal. 

    IN WITNESS WHEREOF, Borrower has caused this Note to be duly executed, sealed and delivered on the date first above written. 

	 	 	HEI, INC.

a Minnesota corporation
	 

 	 
 	 

 	 
 	 

/s/ ANTHONY J. FANT   
 By: Anthony J. Fant

Title: Chairman and CEO

3

  ACKNOWLEDGMENT OF SIGNATURE         

	STATE OF MINNESOTA	)
	 	) SS.
	COUNTY OF RAMSEY	)

    I,
James W. Dierking, a Notary Public in and for the state and county aforesaid, do hereby certify that before me this day personally appeared Anthony J. Fant, the Chairman and CEO of
HEI, Inc., known to me to be the same person whose name is subscribed to the foregoing Capital Expenditure Note, and acknowledged to me that he executed and delivered the foregoing Capital
Expenditure Note as his free and voluntary act, for the uses set forth therein. 

    IN WITNESS WHEREOF, I have hereunto set my hand and official seal this 27th day of July, 2000. 

	 	 	/s/ JAMES W. DIERKING   
Notary Public
	[SEAL]	 	 
	 

 	 
 	 

My Commission Expires:
 1/31/05

4

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EXHIBIT 4.3  

REIMBURSEMENT AGREEMENT  

 BY AND AMONG  

 HEI, INC.  

 AND  

 LASALLE BANK N.A.  

 AND  

 LASALLE BUSINESS CREDIT, INC.  

 Dated As Of: July 31, 2000  

This
Instrument Was Drafted By:

WINTHROP & WEINSTINE, P.A.

3000 Dain Rauscher Plaza

60 South Sixth Street

Minneapolis, Minnesota 55402

Attn: James W. Dierking 

  TABLE OF CONTENTS         

	ARTICLE I. DEFINITIONS	 	1
	 	SECTION 1.1.	 	Defined Terms	 	1
	 	SECTION 1.2.	 	Other Terms	 	3
	 	SECTION 1.3.	 	Reimbursement Agreement Controlling	 	3
	ARTICLE II. COMMITMENT TO ISSUE THE LETTERS OF CREDIT	 	3
	 	SECTION 2.1.	 	Letters of Credit	 	3
	 	SECTION 2.2.	 	Expiration, Renewal of Letters of Credit	 	3
	 	SECTION 2.3.	 	Draw Under Letters of Credit to Redeem or Defease Bonds	 	4
	ARTICLE III. CONDITIONS PRECEDENT	 	4
	 	SECTION 3.1.	 	Conditions Precedent to Issuance of Letters of Credit	 	4
	ARTICLE IV. REIMBURSEMENTS AND OTHER PAYMENTS, LENDER'S RIGHT TO CURE	 	4
	 	SECTION 4.1.	 	Obligation of Reimbursement	 	4
	 	SECTION 4.2.	 	Payment of Letter of Credit Fee	 	5
	 	SECTION 4.3.	 	Capital Adequacy/Change in Law	 	5
	 	SECTION 4.4.	 	Computation of Letter of Credit Fee and Interest	 	5
	 	SECTION 4.5.	 	Right of Lender to Cure Defaults Under Bond Documents	 	5
	 	SECTION 4.6.	 	Payments	 	6
	 	SECTION 4.7.	 	Collateral	 	6
	 	SECTION 4.8.	 	Fees	 	6
	 	SECTION 4.9.	 	Redemptions Under Series A Bonds and Series B Bonds	 	6
	ARTICLE V. WARRANTIES, REPRESENTATIONS AND COVENANTS	 	6
	 	SECTION 5.1.	 	Warranties and Representations	 	6
	 	SECTION 5.2.	 	Covenants	 	7
	ARTICLE VI. EVENTS OF DEFAULT; RIGHTS AND REMEDIES UPON EVENT OF DEFAULT	 	8
	 	SECTION 6.1.	 	Events of Default	 	8
	 	SECTION 6.2.	 	Rights and Remedies	 	8
	ARTICLE VII. MISCELLANEOUS	 	10
	 	SECTION 7.1.	 	Indemnification by Borrower	 	10
	 	SECTION 7.2.	 	Addresses for Notice	 	10
	 	SECTION 7.3.	 	Fees	 	11
	 	SECTION 7.4.	 	Time of Essence	 	11
	 	SECTION 7.5.	 	Binding Effect and Assignment	 	11
	 	SECTION 7.6.	 	Waivers	 	11
	 	SECTION 7.7.	 	Remedies Cumulative	 	12
	 	SECTION 7.8.	 	Governing Law; Construction	 	12
	 	SECTION 7.9.	 	Jurisdiction	 	12
	 	SECTION 7.10.	 	Interest Rate	 	12
	 	SECTION 7.11.	 	Counterparts	 	12
	 	SECTION 7.12.	 	Not Joint Venturers	 	12
	 	SECTION 7.13.	 	Obligations Absolute	 	12
	 	SECTION 7.14.	 	Transfer of Letters of Credit	 	13
	 	SECTION 7.15.	 	Liability of the Lender	 	13
	 	SECTION 7.16.	 	Security Interest in Funds and Bonds	 	13
	 	SECTION 7.17.	 	Term	 	14
	 	SECTION 7.18.	 	Redemption of the Bonds under Casualty or Condemnation Laws	 	14

SIGNATURES

SCHEDULE
OF REQUIRED PRINCIPAL PAYMENTS UNDER SERIES A BONDS (EXHIBIT A) 

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

i

  REIMBURSEMENT AGREEMENT         

    THIS REIMBURSEMENT AGREEMENT, made as of the 31st day of July, 2000, by and among HEI, INC., a Minnesota corporation (the "Borrower"), LASALLE BANK
N.A., a national banking association the ("Bank") and LASALLE BUSINESS CREDIT, INC., a Delaware corporation (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)  Bond Counsel:  Briggs & Morgan, P.A., or such other bond counsel which is acceptable to the
Lender 

    (b)  Bond Documents:  individually or collectively, as the context requires, the Loan Agreement and the
Indenture. 

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

    (d)  Borrower Documents:  collectively, this Reimbursement Agreement, the Credit Agreement, the
Certificate, the Mortgage, 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 and/or by the Credit Agreement. 

    (e)  Cash Collateral Account:  shall have the meaning assigned thereto in
Section 6.2(c) hereof. 

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

    (g)  Collateral Securities:  shall have the meaning assigned thereto in
Section 6.2(c)(1) hereof. 

    (h)  Credit Agreement:  the Loan and Security Agreement of even date herewith by and between the Borrower
and the Lender. 

    (i)  Eligible Securities:  shall have the meaning assigned thereto in
Section 6.2(c)(1) hereof. 

    (j)  Event of Default:  shall have the meaning assigned thereto in Section 6.1 hereof. 

    (k)  Facility:  the approximately 45,496 square foot manufacturing facility which exists on the Project
Premises, together with all additions to, replacements of and substitutions for the foregoing which may be made as permitted or required by the Lender. 

    (l)  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. 

    (m)  Indenture:  the Indenture of Trust dated as of April 1, 1996 by and between the Issuer and
the Trustee relating to the Bonds. 

    (n)  Issuer:  City of Victoria, Minnesota. 

    (o)  Letter of Credit Fee:  shall have the meaning assigned thereto in Section 4.2 hereof. 

1

    (p)  Letters of Credit:  collectively, the Series A Letter of Credit and the Series B
Letter of Credit. 

    (q)  Loan Agreement:  the Loan Agreement dated as of April 1, 1996 by and between the Issuer and
the Borrower. 

    (r)  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 and/or the Bank under or in connection with
Letters of Credit and constituting a valid first lien on a good and marketable fee simple title to the Project Premises. 

    (s)  Obligation of Reimbursement:  shall have the meaning assigned thereto in Section 4.1 hereof. 

    (t)  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, 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. 

    (u)  Project Premises:  the real estate described in Exhibit A attached to the Mortgage. 

    (v)  Related Documents:  shall have the meaning assigned thereto in Section 7.13(a) hereof. 

    (w)  Series A Letter of Credit:  the Irrevocable Letter of Credit No. S524150 issued by the
Bank to the Trustee for the account of the Borrower in the original stated amount of $2,181,331.00. 

    (x)  Series B Letter of Credit:  the Irrevocable Letter of Credit No. S524151 issued by the
Bank to the Trustee for the account of the Borrower in the original stated amount of $1,090,666.00. 

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

    (z)  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 $3,271,997 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

    (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) an
ALTA 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
location of the Facility and related areas (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 Premises 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 Premises, including the distance from the nearest street; and showing any other matters affecting the title to the Project Premises or the
use thereof. 

    (aa)  Trustee:  U.S. Bank Trust National Association (successor to First Trust National Association), and
any co-trustee or successor trustee appointed, qualified and then acting as such under the provisions of the Indenture. 

    SECTION
1.2.  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; Alternate Letter of Credit; Series A Bonds; and Series B Bonds. 

    SECTION
1.3.  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         

    SECTION
2.1.  Letters of Credit.  The Bank hereby agrees that, on the terms and subject to the conditions
hereinafter set forth, the Bank will issue the Letters of Credit to secure payment of the Bonds. 

    SECTION
2.2.  Expiration, Renewal of Letters of Credit.  The Series A Letter of Credit shall have
an initial expiration date of not later than April 1, 2002, 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 Bank 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, 2002, but shall be automatically renewable for 

3

successive periods of two (2) years each (but in no event to a date later than April 1, 2011) unless the Bank 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 Bank 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 Bank 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
2.3.  Draw Under Letters of Credit to Redeem or Defease Bonds.  The Borrower acknowledges and
agrees that the consent of the Bank 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. 

  ARTICLE III.
  
  CONDITIONS PRECEDENT         

    SECTION
3.1.  Conditions Precedent to Issuance of Letters of Credit.  As a condition precedent to the
issuance of the Letters of Credit, 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
Organizational Documents; 

    (e) the
Title Documents; 

    (f)  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; 

    (g) evidence
of payment of all expenses incurred by the Lender which are payable by the Borrower pursuant to Section 7.3 hereof; and 

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

  ARTICLE IV.
  
  REIMBURSEMENTS AND OTHER PAYMENTS
  LENDER'S RIGHT TO CURE         

    SECTION
4.1.  Obligation of Reimbursement.  The Borrower hereby agrees to pay the Bank or the Lender, as
the case may be (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 Bank or the Lender may pay or incur relative to 

4

such draw, (ii) on demand, any amounts advanced by the Bank or 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 Bank or 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 Bank or 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 Bank or the Lender, by 2:00 o'clock p.m. on the same day
such draft is paid by
the Bank or the Lender. The Borrower acknowledges and agrees that the Lender is also obligated to reimburse the Bank for any amounts drawn under the Letters of Credit and, accordingly, the Borrower's
Obligation of Reimbursement shall inure to the benefit of both the Bank and the Lender. A schedule of the principal payments required under the Series A Bonds is attached hereto as  Exhibit A
and a schedule of the principal payments required under the Series B Bonds is attached hereto as
Exhibit B. 

    SECTION
4.2.  Payment of Letter of Credit Fee.  So long as either of the Letters of Credit is
outstanding, the Borrower agrees to pay the Lender a letter of credit fee (the "Letter of Credit Fee") with respect to the Letters of Credit, as and when described in Section 5(d) of the
Credit Agreement. 

    SECTION
4.3.  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 Bank or the Lender (including without
limitation, a requirement which affects the Bank's or the Lender's allocation of capital resources), or (ii) impose on the Bank or 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 Bank or the Lender of issuing or maintaining the Letters of Credit or reduce the Bank's or the Lender's return hereunder or all or any of the Bank's or the Lender's capital is
reduced (which increase in cost or reduction in return shall be determined by the Bank's or the Lender's reasonable allocation of the aggregate of such cost increases or return reductions resulting
from such events), then upon demand by the Bank or the Lender, the Borrower shall immediately pay to the Bank or the Lender, as the case may be, from time to time as specified by the Bank or the
Lender, as the case may be, additional amounts which shall be sufficient to compensate the Bank or 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 Bank or the Lender as a result of any event mentioned in
clause (i) or (ii) above, submitted by the Bank or the Lender to the Borrower shall be conclusive, absent manifest error, as to the amount thereof. 

    SECTION
4.4.  Computation of Letter of Credit Fee and Interest.  The Letter of Credit 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
4.5.  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 

5

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
4.6.  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 135 South LaSalle Street, Chicago, Illinois 60603. In addition, the Bank and the Lender shall have the right to
debit any of the Borrower's accounts at the Bank without further authorization of the Borrower to make any such payments. 

    SECTION
4.7.  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 pursuant to the Credit Agreement, and
that the Obligation of Reimbursement with respect to amounts advanced under the Letters of Credit is also secured pursuant to the Mortgage. 

    SECTION
4.8.  Fees.  In addition to the Letter of Credit 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 if either or both of the Letters of Credit is transferred to a successor trustee under the Indenture. 

    SECTION
4.9.  Redemptions Under Series A Bonds and Series B Bonds.  The parties hereto
acknowledge that 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, 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 the respective amounts set forth in  Exhibit A attached hereto and hereby made a part hereof. In addition, the Borrower agrees that it shall make principal payments in respect of the
Series B Bonds in the amounts and at the times set forth in Exhibit B attached hereto and hereby made a part hereof. 

  ARTICLE V.
  
  WARRANTIES, REPRESENTATIONS
  AND COVENANTS         

    SECTION
5.1.  Warranties and Representations.  The Borrower hereby acknowledges, repeats and reaffirms
each and all of the representations and warranties of the Borrower contained in and Credit Agreement, including without limitation those set forth in Section 13 thereof. In addition, the
Borrower hereby represents and warrants to the Lender as follows: 

    (a) the
Project and the present use thereof 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; 

    (b) 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 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; 

6

    (c) 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. 

    SECTION
5.2.  Covenants.  In addition to the covenants and agreements of the Borrower set forth and
contained in the Credit Agreement and 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
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; 

    (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 and the Organizational 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) 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
any and all penalties accrued thereon; 

    (d) not
to assign this Agreement or any interest herein; 

    (e) to
obtain and maintain at all times 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) the insurance required pursuant to the Credit Agreement; 

    (f)  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; 

    (g) to
hold the Bank and the Lender harmless, and the Bank 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 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; 

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

7

    (i)  to cause to be prepared and delivered to the Lender the financial and other statement, reports, certificates, notices and the like as are required under the Credit
Agreement. 

  ARTICLE VI.
  
  EVENTS OF DEFAULT; RIGHTS AND REMEDIES UPON
  EVENT OF DEFAULT         

    SECTION
6.1.  Events of Default.  Any one or more of the events, conditions or circumstances described as
an "Event of Default" in the Loan Agreement or the Credit Agreement shall constitute an Event of Default hereunder. 

    SECTION
6.2.  Rights and Remedies.  Upon the occurrence and continuance of an Event of Default, the Bank
and/or 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 or them): 

    (a) 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. 

    (b) To
instruct the Trustee to accelerate the Bonds and submit a draft under either of the Letters of Credit pursuant to the Indenture. 

    (c) 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 Letter of Credit 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(c), 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 (c)(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 

8

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 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 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. 

    (d) 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; 

    (e) 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; 

9

 

    (f)  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. 

  ARTICLE VII.
  
  MISCELLANEOUS         

    SECTION
7.1.  Indemnification by Borrower.  

    (a) The
Borrower agrees to indemnify and hold harmless the Bank and the Lender, their respective officers, agents and employees, against any and all losses, claims,
damages or liability to which they or any of them 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 Bank and the Lender, their respective officers, agents and employees, for any reasonable
out-of-pocket legal and other expenses (including reasonable counsel fees) incurred by any one or more of them in connection with investigating any such losses, claims, damages
or liabilities or in connection with defending any actions relating thereto. The Bank and the Lender agree, 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 them. The Borrower further releases and agrees to hold harmless the
Bank and the Lender, their respective 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 Bank and the Lender from and against any and all claims, damages, losses, liabilities, costs or expenses
whatsoever which the Bank and the Lender may incur (or which may be claimed against the Bank and/or 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 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 Bank or the Lender
contained in any written materials supplied or approved by the Bank or 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 Bank or 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 Bank or the Lender or their respective 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
7.2.  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 

10

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: 

LaSalle
Business Credit, Inc.

Two Honey Creek Corporate Center

115 South 84th Street, Suite 220

Attention:

Facsimile No: (414) 256-5099 

If
to the Bank: 

LaSalle
Bank N.A.

135 South LaSalle Street

Chicago, Illinois 60603

Attention: Mike Carsella

Facsimile No: (312) 904-6450 

If
to the Borrower: 

HEI, Inc.

1495 Steiger Lake Lane

Victoria, MN 55386

Facsimile No.: (612) 443-2668 

    SECTION
7.3.  Fees.  The Borrower will reimburse the Bank and 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 Bank or the Lender in connection with (i) the preparation, negotiation, approval, execution and delivery of the
Letters of Credit, this Agreement, the Mortgage, the Credit Agreement, the Loan 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 Bank or the Lender pursuant to Article III hereof; and (v) the enforcement by
the Bank or the Lender during the term hereof or thereafter of any of the rights or remedies of the Bank or 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
7.4.  Time of Essence.  Time is of the essence in the performance of this Agreement. 

    SECTION
7.5.  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 Bank and the Lender and their respective participants, successors and assigns. All rights and powers specifically conferred upon the Bank and/or the Lender may be
transferred or delegated by the Bank and/or the Lender to any of their respective participants, successors or assigns. 

    SECTION
7.6.  Waivers.  No waiver by the Bank or the Lender of any right, remedy or Event of Default
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 Bank or the 

11

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
7.7.  Remedies Cumulative.  The rights and remedies herein specified of the Bank and the Lender
are cumulative and not exclusive of any rights or remedies which the Bank or the Lender would otherwise have at law or in equity or by statute. 

    SECTION
7.8.  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 Bank and/or the Lender the greater right shall govern. 

    SECTION
7.9.  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
7.10.  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
7.11.  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
7.12.  Not Joint Venturers.  The Bank and the Lender are not, and shall not by reason of any
provision of any of the Borrower Documents be deemed to be, a joint venturer with or partner or agent of the Borrower. 

    SECTION
7.13.  Obligations Absolute.  Subject to Section 7.15 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; 

12

    (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
7.14.  Transfer of Letters of Credit.  The Letters of Credit may only be transferred in
accordance with the terms thereof. 

    SECTION
7.15.  Liability of the Bank and 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 Bank nor the Lender, nor any of their
respective 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 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 Bank 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 Bank, and the Bank 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 Bank 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 Bank 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
7.16.  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 

13

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 7.16, 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. 

    SECTION
7.17.  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 Bank and the Lender hereunder or under the documents related hereto. 

    SECTION
7.18.  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 3.1 of 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 Article IV hereof, 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. 

14

    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. 

	 	 	LASALLE BUSINESS CREDIT, INC.
	 

 	 
 	 

/s/ DALE GRZENIA   
 By: Dale Grzenia

   Its: Vice President
	 

 	 
 	 

LASALLE BANK N.A.
	 

 	 
 	 

/s/ BRUCE A. SPRENGER   
 By: Bruce A. Sprenger

   Its: Senior Vice President
	 

 	 
 	 

HEI, INC.
	 

 	 
 	 

/s/ ANTHONY J. FANT   
 By: Anthony J. Fant

   Its: Chairman and CEO

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  EXHIBIT A         

(Schedule
of Principal Payments Required Under Series A Bonds) 

	Date of Payment
 
	 	Payment Amount

	04/01/01	 	$	605,000
	04/01/02	 	$	605,000
	04/01/03	 	$	605,000
	04/01/04	 	$	255,000
	04/01/05	 	$	20,000
	 	 	 	

	 	 	Total Principal Payments	 	$	2,090,000
	 	 	 	

  EXHIBIT B         

(Schedule
of Principal Payments Required Under Series B Bonds) 

	Date of Payment
 
	 	Payment Amount

	04/01/01	 	$	95,000
	04/01/02	 	$	95,000
	04/01/03	 	$	95,000
	04/01/04	 	$	95,000
	04/01/05	 	$	95,000
	04/01/06	 	$	95,000
	04/01/07	 	$	95,000
	04/01/08	 	$	95,000
	04/01/09	 	$	95,000
	04/01/10	 	$	95,000
	04/01/11	 	$	95,000
	 	 	 	

	 	 	Total Principal Payments	 	$	1,045,000
	 	 	 	

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TABLE OF CONTENTS

REIMBURSEMENT AGREEMENT

ARTICLE I. DEFINITIONS

ARTICLE II. COMMITMENT TO ISSUE THE LETTERS OF CREDIT

ARTICLE III. CONDITIONS PRECEDENT

ARTICLE IV. REIMBURSEMENTS AND OTHER PAYMENTS LENDER'S RIGHT TO CURE

ARTICLE V. WARRANTIES, REPRESENTATIONS AND COVENANTS

ARTICLE VI. EVENTS OF DEFAULT; RIGHTS AND REMEDIES UPON EVENT OF DEFAULT

ARTICLE VII. MISCELLANEOUS

EXHIBIT A

EXHIBIT B

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