EXHIBIT (4)(xvii)

     CONTINUING UNCONDITIONAL GUARANTY
     
     
          WHEREAS, Plymouth Rubber Company, Inc.  ("Borrower") has
     entered into a Loan and Security Agreement dated June 6, 1996*, (the
     "Loan Agreement") with LaSalle National Bank ("Bank") pursuant to
     which Bank has made or may, in its sole discretion, from time to
     time hereafter, made loans and advances to or extend other financial
     accommodations to Borrower;
     
          WHEREAS, the undersigned is desirous of having Bank extend
     and/or continue the extension of credit to Borrower and Bank has
     required that Guarantor (as hereinafter defined) execute and deliver
     this Guaranty to Bank as a condition to the extension and
     continuation of credit by Bank; and 
     
          WHEREAS, the extension and/or continued extension of credit,
     as aforesaid, by Bank is necessary and desirable to the conduct and
     operation of the business of Borrower and will inure to the personal
     and financial benefit of Guarantor;
     
          NOW, THEREFORE, for value received and in consideration of any
     loan, advance, or financial accommodation of any kind whatsoever
     heretofore, now or hereafter made, given or granted to Borrower by
     Bank (including, without limitation, the Loans as defined in, and
     made or to be made by Bank to Borrower pursuant to, the Loan
     Agreement), the undersigned, and each of them, if there be more than
     one, (collectively, the "Guarantor") unconditionally guaranties (i)
     the full and prompt payment when due, whether at maturity or
     earlier, by reason of acceleration or otherwise, and at all times
     thereafter, of all of the indebtedness, liabilities and obligations
     of every kind and nature of Borrower to Bank or any parent,
     affiliate or subsidiary of Bank (the term "Bank" as used hereafter
     shall include such parents, affiliates and subsidiaries), howsoever
     created, arising or evidenced, whether direct or indirect, absolute
     or contingent, joint or several, now or hereafter existing, or due
     or to become due, an howsoever owned, held or acquired by Bank,
     whether through discount, overdraft, purchase, direct loan or as
     collateral or otherwise, including without limitation all
     obligations and liabilities of Borrower to Bank under the Loan
     Agreement and (ii) the prompt, full and faithful discharge by
     Borrower of each and every term, condition, agreement,
     representation and warranty now or hereafter made by Borrower to
     Bank (all such indebtedness, liabilities and obligations being
     hereinafter referred to as the "Borrower's Liabilities").  Guarantor
     further agrees to pay all costs and expenses, including, without
     limitation, all court costs and reasonable attorneys' and
     paralegals' fees paid or incurred by Bank in endeavoring to collect
     all or any part of Borrowers's Liabilities from, or in prosecuting
     any action against, Guarantor or any other guarantor of all or any
     part of Borrower's Liabilities.  All amounts payable by Guarantor
     under this Guaranty shall be payable upon demand by Bank.
     
          Notwithstanding any provision of this Guaranty to the
     contrary, it is intended that this Guaranty, and any liens and
     security interests granted by Guarantor to secure this Guaranty, not
     constitute a "Fraudulent Conveyance" (as defined below). 
     Consequently, Guarantor agrees that if the Guaranty, or any liens or
     security interests securing this Guaranty, would, but for the
     application of this sentence, constitute a Fraudulent Conveyance,
     this Guaranty and each such lien and security interest shall be
     valid and enforceable only to the maximum extent that would not
     cause this Guaranty or such lien or security interest to constitute
     a Fraudulent Conveyance, and this Guaranty shall automatically be
     deemed to have been amended accordingly at all relevant times.  For
     purposes hereof, "Fraudulent Conveyance" means a fraudulent
     conveyance under Section 548 of the "Bankruptcy Code" (as hereinafter
     defined) or a fraudulent conveyance or fraudulent transfer under the
     provisions of any applicable fraudulent conveyance or fraudulent
     transfer law or similar law of any state, nation or other
     governmental unit, as in effect from time to time.
     
     
     
          Guarantor hereby agrees that, except as hereinafter provided,
     its obligations under this Guaranty shall be unconditional,
     irrespective of (i) the validity or enforceability of Borrower's
     Liabilities or any part thereof, or of any promissory note or other
     document evidencing all or any part of Borrower's Liabilities, (ii)
     the absence of any attempt to collect Borrower's Liabilities from
     Borrower or any other guarantor or other action to enforce the same,
     (iii) the waiver or consent by Bank with respect to any provision of
     any instrument evidencing Borrower's Liabilities, or any part
     thereof, or any other agreement heretofore, now or hereafter
     executed by Borrower and delivered to Bank, (iv) failure by Bank to
     take any steps to perfect and maintain its security interest in, or
     to preserve its rights to, any security or collateral for Borrower's
     Liabilities, (v) the institution of any proceeding under Chapter 11
     of Title 11 of the United States Code (11 U.S.C.  101 et seq.), as
     amended  (The "Bankruptcy Code"), or any similar proceeding, by or
     against Borrower, or Bank's election in any such proceeding of the
     application of Section 1111(b)(2) of the Bankruptcy Code, (vi) any
     borrowing or grant of a security interest by Borrower as debtor-in-
     possession, under Section 364 of the Bankruptcy Code, (vii) the
     disallowance, under Section 502 of the Bankruptcy Code, of all or
     any portion of Bank's claim(s) for repayment of Borrower's
     Liabilities, or (viii) any other circumstance which might otherwise
     constitute a legal or equitable discharge or defense of a guarantor.
     
          Guarantor hereby waives diligence, presentment, demand of
     payment, filing of claims with a court in the event of receivership
     or bankruptcy of Borrower, protest or notice with respect to
     Borrower's Liabilities and all demands whatsoever, and covenants
     that this Guaranty will not be discharged, except by complete
     performance of the obligations and liabilities contained herein. 
     Upon any default by Borrower as provided in any instrument or
     document evidencing all or any part of Borrower's Liabilities,
     including without limitation the Loan Agreement, Bank may, at its
     sole election, proceed directly and at once, without notice, against
     Guarantor to collect and recover the full amount or any portion of
     Borrower's Liabilities, without first proceeding against Borrower,
     or any other person, firm, or corporation, or against any security
     or collateral for Borrower's Liabilities. 
     
          Bank is hereby authorized, without notice or demand and
     without affecting the liability of Guarantor hereunder, to at any
     time and from time to time (i) renew, extend, accelerate or
     otherwise change the time for payment of, or other terms relating
     to, Borrower's Liabilities or otherwise modify, amend or change the
     terms of any promissory note or other agreement, document or
     instrument now or hereafter executed by Borrower and delivered to
     Bank; (ii) accept partial payments on Borrower's Liabilities; (iii)
     take and hold security or collateral for the payment of Borrower's
     Liabilities guaranteed hereby, or for the payment of this Guaranty,
     or for the payment of any other guaranties of Borrower's Liabilities
     or other liabilities of Borrower, and exchange, enforce, waive and
     release any such security or collateral; (iv) apply such security or
     collateral and direct the order or manner of sale thereof as in its
     sole discretion it may determine; and (v) settle, release,
     compromise, collect or otherwise liquidate Borrower's Liabilities
     and any security or collateral therefore in any manner, without
     affecting or impairing the obligations of Guarantor hereunder.  Bank
     shall have the exclusive right to determine the time and manner of
     application of any payments or credits, whether received from
     Borrower or any other source, and such determination shall be
     binding on Guarantor.  All such payments and credits may be applied,
     reversed and reapplied, in whole or in part, to any of Borrower's
     Liabilities as Bank shall determine in its sole discretion without
     affecting the validity or enforceability of this Guaranty.
     
          To secure the payment and performance of Guarantor's
     obligations and liabilities contained herein, Guarantor grants to
     Bank a security interest in all property of Guarantor delivered
     concurrently herewith or which is now, or at any time hereafter in
     transit to, or in the possession, custody or control of Bank, and
     all proceeds of all such property.  Guarantor agrees that Bank shall
     have the rights and remedies of a secured party under the Uniform
     Commercial Code of Illinois, as now existing or hereafter amended,
     with respect to all of the aforesaid property, including without
     limitation thereof, the right to sell or otherwise dispose of any or
     all of such property and apply the proceeds of such sale to the
     payment of Borrower's Liabilities.  In addition, at any time after
     maturity of Borrower's Liabilities by reason of acceleration or
     otherwise, Bank may, in its sole discretion, without notice to
     Guarantor and regardless of the acceptance of any security or
     collateral for the payment hereof, appropriate and apply toward the
     payment of Borrower's Liabilities (i) any indebtedness due or to
     become due from Bank to Guarantor, and (ii) any moneys, credits or
     other property belonging to Guarantor, at any time held by or coming
     into the possession of Bank whether for deposit or otherwise.
     
      
          Guarantor hereby assumes responsibility for keeping itself
     informed of the financial condition of Borrower, and any and all
     endorsers and/or other guarantors of any instrument or document
     evidencing all or any part of Borrower's Liabilities and of all
     other circumstances bearing upon the risk of nonpayment of
     Borrower's Liabilities or any part thereof that diligent inquiry
     would reveal and Guarantor hereby agrees that Bank shall have no
     duty to advise Guarantor of information known to Bank regarding such
     condition or any such circumstances or to undertake any
     investigation not a part of its regular business routine.  If Bank,
     in its sole discretion, undertakes at any time or from time to time
     to provide any such information to any Guarantor, Bank shall be
     under no obligation to update any such information or to provide any
     such information to Guarantor on any subsequent occasion.
     
          Guarantor consents and agrees that Bank shall be under no
     obligation to marshall any assets in favor of Guarantor or against
     or in payment of any or all of Borrower's Liabilities.  Guarantor
     further agrees that, to the extent that Borrower makes a payment or
     payments to Bank, or Bank receives any proceeds of collateral, which
     payment or payments or any part thereof are subsequently
     invalidated, declared to be fraudulent or preferential, set aside
     and/or required to be repaid to Borrower, its estate, trustee,
     receiver or any other party, including, without limitation,
     Guarantor, under any bankruptcy law, state or federal law, common
     law or equitable theory, then to the extent of such payment or
     repayment, Borrower's Liabilities or the part thereof which has been
     paid, reduced or satisfied by such amount, and Guarantor's
     obligations hereunder with respect to such portion of Borrower's
     Liabilities, shall be reinstated and continued in full force and
     effect as of the date such initial payment, reduction or
     satisfaction occurred.
     
          Guarantor agrees that any and all claims of Guarantor against
     Borrower, any endorser or any other guarantor of all or any part of
     Borrower's Liabilities, or against any of Borrower's properties,
     whether arising by reason of any payment by Guarantor to Bank
     pursuant to the provisions hereof, or otherwise, shall be
     subordinate and subject in right of payment to the prior payment, in
     full, of all of Borrower's Liabilities.
     
          Bank may, without notice to anyone, sell or assign Borrower's
     Liabilities or any part thereof, or grant participations therein,
     and in any such event each and every immediate or remote assignee or
     holder of, or participant in, all or any of Borrower's Liabilities
     shall have the right to enforce this Guaranty, by suit or otherwise
     for the benefit of such assignee, holder, or participant, as fully
     as if herein by name specifically given such right, but Bank shall
     have an unimpaired right, prior and superior to that of any such
     assignee, holder or participant, to enforce this Guaranty for the
     benefit of Bank, as to any part of Borrower's Liabilities retained
     by Bank.
     
          This Guaranty shall be binding upon Guarantor and upon the
     successors (including without limitation, any receiver, trustee or
     debtor in possession of or for Guarantor) of Guarantor and shall
     inure to the benefit of Bank and its successors and assigns.  If
     there is more than one signatory hereto, all references to Guarantor
     herein shall include each and every Guarantor and each and every
     obligation of Guarantor hereunder shall be the joint and several
     obligation of each Guarantor.  Each Guarantor that is a corporation
     or a partnership hereby represents and warrants that it has all
     necessary corporate or partnership authority, as the case may be, to
     execute and deliver this Guaranty and to perform its obligations
     hereunder.
     
          This Guaranty shall continue in full force and effect, and
     Bank shall be entitled to make loans and advances and extend
     financial accommodations to Borrower on the faith hereof until such
     time as Bank has, in writing, notified Guarantor that all of
     Borrower's Liabilities have been paid in full and discharged and the
     Loan Agreement has been terminated or until Bank has actually
     received written notice from any Guarantor of the discontinuance of
     this Guaranty as to that Guarantor, or written notice of the death,
     incompetency or dissolution of any Guarantor.  In case of any
     discontinuance by, or death, incompetency or dissolution of, any
     Guarantor (collectively, a "Termination Event"), this Guaranty and
     the obligations of such Guarantor and his or its heirs, legal
     representatives, successors or assigns, as the case may be, shall
     remain in full force and effect with respect to all of Borrower's
     Liabilities incurred prior to the receipt by Bank of written notice
     of the Terminating Event.  The occurrence of a Terminating Event
     with respect to one Guarantor shall not affect or impair the
     obligations of any other Guarantor hereunder.
     
          Wherever possible each provision of this Guaranty shall be
     interpreted in such manner as to be effective and valid under
     applicable law, but if any provision of this Guaranty shall be
     prohibited by or invalid under such law, such provision shall be
     ineffective to the extent of such prohibition or invalidity without
     invalidating the remainder of such provision or the remaining
     provisions of this Guaranty.
     
     
          THIS GUARANTY SHALL BE GOVERNED AND CONTROLLED BY THE INTERNAL
     LAWS OF THE STATE OF ILLINOIS.
     
          Guarantor irrevocably agrees that, subject to Bank's sold and
     absolute election, ALL ACTIONS OR PROCEEDINGS IN ANY WAY, MANNER OR
     RESPECT, ARISING OUT OF OR FROM OR RELATED TO THIS GUARANTY SHALL BE
     LITIGATED IN COURTS HAVING SITUS WITHIN THE CITY OF CHICAGO, STATE
     OF ILLINOIS.  GUARANTOR HEREBY CONSENTS AND SUBMITS TO THE
     JURISDICTION OF ANY LOCAL, STATE OR FEDERAL COURTS LOCATED WITHIN
     SAID CITY AND STATE.  Guarantor hereby irrevocably appoints and
     designates the Secretary of State of Illinois, whose address is
     Springfield, Illinois (or any other person having and maintaining a
     place of business in such state whom Guarantor may from time to time
     hereafter designate upon ten (10) days written notice to Bank and
     who Bank has agreed in its sole discretion in writing is
     satisfactory and who has executed an agreement in form and substance
     satisfactory to Bank agreeing to act as such attorney and agent), as
     Guarantor's true and lawful attorney and duly authorized agent for
     acceptance of service of legal process.  Guarantor agrees that
     service of such process upon such person shall constitute personal
     service of such process upon Guarantor.  GUARANTOR HEREBY WAIVES ANY
     RIGHT IT MAY HAVE TO TRANSFER OR CHANGE THE VENUE OF ANY LITIGATION
     BROUGHT AGAINST GUARANTOR BY BANK IN ACCORDANCE WITH THIS PARAGRAPH.
     
          GUARANTOR HEREBY WAIVES ALL RIGHTS TO TRIAL BY JURY IN ANY
     ACTION OR PROCEEDING WHICH PERTAINS DIRECTLY OR INDIRECTLY TO THIS
     GUARANTY.
     
          If there is attached to this Guaranty a Rider A - Special
     Provisions, such Rider is by this reference incorporated into and
     made a part of this Guaranty.
     
     
   
     
     
     
          IN WITNESS WHEREOF, this Guaranty has been duly executed by
     the undersigned as of this 20 day of   March , 19 97 .
     
     
      FOR INDIVIDUAL GUARANTOR:      FOR CORPORATE OR PARTNERSHIP
     GUARANTOR:
                                     Brite-Line Technologies, Inc. 
     
                                     By                                 
       
     
                                     Its                                
       
     Address:
     
                                     By                                 
       
     
     
                                Its                                
       
                                   10660 East 51st Avenue
                                    Denver, Colorado 80239         
       
                                   Address:
          
   
     
     
     
              RIDER A - SPECIAL PROVISIONS
     
     
          This Rider A - Special Provisions is attached to and made a
     part of that certain Continuing Unconditional Guaranty (the
     "Guaranty") of even date herewith executed by BRITE-LINE
     TECHNOLOGIES, INC. ("Guarantor") in favor of LaSalle National Bank
     ("Bank").
     
          1.  Notwithstanding anything to the contrary contained in the
     Guaranty, no payment made by or for the account of Guarantor
     including, without limitation, (i) a payment made by Guarantor in
     respect of Borrower's Liabilities or (ii) a payment made by any
     other person under any other guaranty, shall entitle the Guarantor
     by subrogation or otherwise, to any payment from Borrower or from or
     out of any property of Borrower and Guarantor shall not exercise any
     right or remedy against Borrower or any property of Borrower by
     reason of any performance by Guarantor under the Guaranty.
     
     
     
                                 BRITE-LINE TECHNOLOGIES, INC. 
     
     
     
                              By                                  
     
     
                              Its