[LETTERHEAD]



July 22, 1994



To former DynEco International, Inc shareholders:


Effective March 31, 1994, the shares of DynEco International, Inc. were 
exchanged for shares of DynEco Corporation.  In this exchange, DynEco 
Corporation assumed certain outstanding Warrants of DynEco International, 
Inc. The Warrants assumed included a Warrant to all DynEco International, 
Inc. shareholders to purchase one (1) additional common share of DynEco 
International, Inc. share at $7.00 per share until December 31, 1995, subject 
to the terms and conditions of the Warrant, for each ten (10) shares held.

     Upon your exercise and return of the enclosed Warrant Purchase Agreement 
(no payment required), a DynEco Corporation Warrant certificate will promptly 
be forwarded to you.

     If you have any questions regarding the Warrant, please call me at 
612-633-1501.

     Also enclosed for your information is a Research Report on DynEco 
Corporation issued by Mathews, Holmquist & Associates, Inc.

Respectfully,

 /s/ Donald Hewitt
Donald Hewitt
Assistant Secretary


Enclosures:



                           WARRANT PURCHASE AGREEMENT
                               DYNECO CORPORATION

                                  July 1, 1994

TOTAL Shares

Dear Sir/Madam:

     On May 1, 1993, DynEco International, Inc. ("DII") issued you a Warrant 
to purchase up to 392,600 shares of common stock of DII for the purchase 
price of $7.00 per share (the "DII Warrant").  On March 31, 1994 (the 
"Effective Date"), the shareholders of DII exchanged all of their shares of 
DII common stock for the common stock of DynEco Corporation (the "Exchange") 
pursuant to the terms and provisions of that certain Agreement and Plan of 
Exchange dated June 18, 1993.  On the Effective Date of the Exchange, DynEco 
Corporation (the "Company") assumed the DII Warrant and, in connection 
therewith, the Company and you agree to enter into this Warrant Purchase 
Agreement, which incorporates all of the terms and provisions of the DII 
Warrant previously issued to you.

     The Company hereby agrees with you as follows:

     1.   Concurrently with the execution of the Warrant Purchase Agreement 
(the "Agreement"), the Company will sell and deliver to you for one ($1.00) 
Dollar and other good and valuable consideration, a Warrant to purchase up to 
392,600 shares of Common Stock of the Company for the purchase price of Seven 
Dollars ($7.00) per share of Common Stock (the "Warrant").

     2.   The Warrant purchase right may be exercised at any time after May 
1, 1993, and up until 5:00 o'clock p.m. on December 31, 1995 except that if 
the Company at any time after the Warrant first becomes exercisable and prior 
to December 31, 1995 proposes to register any of its securities, either for 
its own account or the account of security holders, other than a registration 
on Forms S-8 or S-14, or any registration on a form which does not permit 
secondary sales, the Company shall give written notice of such intention to 
each holder of Warrants ("Holder"), and, said Holder must exercise the 
Warrant purchase right within thirty (30) days of such notice or the Warrant 
shall expire with no further action taken on the part of the company.

     3.   The Company covenants that all shares that may be issued upon the 
exercise of the Warrant will, upon issuance, be validly issued, fully paid 
and non assessable and free from all taxes, liens and charges with respect to 
the issuance thereof.  The Company further covenants that during the period 
within which the Warrant may be exercised, the Company will at all times have 
authorized and reserved a sufficient number of shares of Common Stock to 
permit the exercise of the Warrant.

     4.   Neither the Warrant nor your right under this Agreement shall be 
transferable except (i) by consent of the Company and (ii) in compliance with 
all applicable federal and state securities laws to the satisfaction of the 
Company.  The provisions of this Section 4 shall be binding upon any 
transferee of the Warrant.  The Warrant and shares issued upon the exercise 
of the Warrant shall bear the following legend:

   NO SALE, TRANSFER, PLEDGE OR OTHER DISPOSITION OF THIS WARRANT OR THE SHARES
  PURCHASABLE HEREUNDER SHALL BE MADE EXCEPT PURSUANT TO REGISTRATION UNDER THE
     SECURITIES ACT OF 1933, AS AMENDED, OR PURSUANT TO AN OPINION OF COUNSEL 
  SATISFACTORY TO THE ISSUER THAT REGISTRATION IS NOT REQUIRED. TRANSFER OF THIS


                                  Page 1 of 4


WARRANT IS ALSO RESTRICTED BY AN AGREEMENT DATED MAY 1, 1993.  A COPY OF WHICH
IS AVAILABLE FROM THE ISSUER.

     5.
          (a)  The provision of this Section 5 shall be binding upon any
          transferee of the Warrant and upon each holder of shares of Common
          Stock or other Company securities issued upon exercise of the Warrant
          (the "Shares") until such Shares shall have been sold to the public
          pursuant to either an effective registration statement under the
          Securities Act of 1933, as amended (the 1933 Act") or an exemption
          from registration established to the satisfaction of the Company.  You
          and each transferee will cause any proposed transferee of the Shares
          to agree to take and hold the Shares subject to the provisions of this
          Section 5.  As used in this Section 5, the term "Shares" includes any
          shares of the Company's Common Stock or other securities issued in
          respect of the Shares pursuant to any stock split, stock dividend,
          recapitalization or otherwise; and the term "Warrant" includes any
          warrant or warrants issued in exchange for the original Warrant.

          (b)  Prior to any proposed transfer of the Warrant or of the Shares,
          the holder thereof shall give written notice to the Company stating
          such holder's intention to effect such transfer and describing the
          circumstances of the proposed transfer in sufficient detail,
          accompanied by either (i) an opinion of counsel reasonably
          satisfactory to the Company to the effect that the proposed transfer
          may be effected without registration under the Securities Act, or (ii)
          a "no action" letter from the staff of the Securities and Exchange
          Commission to the effect that the staff will not recommend that
          enforcement action be taken if the proposed transfer is effected
          without registration.  Subject to evidence of compliance with any
          applicable state securities or "blue sky" law or laws, the Company
          shall promptly notify the holder in writing that such holder may
          proceed with its transfer as described, and, if the transfer is of
          Shares, shall instruct its transfer agent to remove any stop-transfer
          restrictions against the Shares when transferred as proposed.

          (c)  If the Company at any time after the Warrant first becomes
          exercisable and prior to December 31, 1995 proposes to register any of
          its securities, either for its own account or the account of security
          holders, other than a registration on Forms S-8 or S-14, or any
          registration on a form which does not permit secondary sales, the
          Company shall, each such time, give written notice of such intention
          to each holder of Warrants or Shares ("Holder"), and, upon written
          request of any Holder received by the company within twenty (20) days
          after the Company has given such notice, include in such registration
          (and all related qualifications under state securities laws) all
          Shares (whether issued or issuable) specified in such written request.
          If the registration involves any underwriting, the Company shall so
          advise the Holders in the notice, and the right of each Holder to have
          its Shares included in the registration shall be conditioned upon such
          Holder's Shares being included in the underwriting arrangements with
          underwriters (selected by the Company) on the same terms as other
          persons selling common stock or other Company securities to the
          underwriters. Notwithstanding the foregoing, if the underwriters
          determine that marketing factors require a limitation of the number of
          shares to be underwritten, the number of Shares to be registered for
          the account of all Holders may be limited in proportion to limitations
          imposed on other holders of Company Common Stock or other Company
          securities seeking to have their securities included in the
          registration pursuant to registration rights similar to those
          conferred upon Holders by this paragraph (c); provided, however, that
          priority may be given to securities to be sold for the account of the
          Company.  The allocation shall be made in proportion, as nearly as
          practicable, to the respective number of shares requested to be
          included in such registration by each person selling Company Common
          Stock or other company securities to the underwriters, including
          Holders.  Any Holder disapproving of the terms of the underwriting may
          withdraw therefrom by written notice to the Company, and such Holder's
          Shares shall be withdrawn from registration.

                                 Page 2 of 4


          (d)  All expenses of registration and qualification incurred in
          connection with a registration under paragraph (c) of this Section 5
          shall be borne by the Company, except that each Holder whose Shares
          are being registered shall bear the fees and expenses of its own
          counsel, if any, and the underwriting commission or discount
          applicable to its Shares being sold.  The Company will keep the
          Holders participating in a registration advised of the status of the
          registration and will furnish such number of preliminary and final
          prospectuses as such Holders may reasonably request; and such Holders
          will furnish to the Company such information regarding such Holders as
          may be required in connection with the registration.

          (e)  The following provisions shall apply to any registration effected
          pursuant to paragraph (c) of this Section 5:

               (i)  The Company shall indemnify and hold harmless such Holder
               and each underwriter of the Shares so registered or qualified
               (including any broker or dealer through whom such securities may
               be sold) and each person, if any, who controls any such Holder or
               any such underwriter within the meaning of the Securities Act
               from and against any and all losses, claims, damages, expenses or
               liabilities, joint and several, to which they or any of them may
               become subject under the Securities Act or under any other
               statute or at common law or otherwise, and, except as hereinafter
               provided, will reimburse each Holder and each of the underwriters
               and each such controlling person, if any, for any legal or other
               expenses reasonably incurred by any of them in connection with
               investigating or defending any actions, whether or not resulting
               in any liability, insofar as such losses, claims, damages,
               expenses, liabilities or actions arise out of or are based upon
               any untrue statement or alleged untrue statement of a material
               fact contained in the registration statement, any preliminary
               prospectus or the final prospectus (or the registration statement
               or prospectus as from time to time amended or supplemented by the
               Company) or arise out of or are based upon the omission or
               alleged omission to state therein a material fact required to be
               stated therein or necessary in order to make the statements
               therein not misleading, unless such untrue statement or omission
               was made in reliance upon and in conformity with information
               furnished in writing to the Company in connection therewith by
               such Holder or underwriter expressly for use therein.  Promptly
               after receipt by any Holder or any underwriter or any person
               controlling such Holder or such underwriter of notice of the
               commencement of any action in respect of which indemnity may be
               sought against the Company, such Holder or such underwriter, as
               the case may be, will notify the Company in writing of the
               commencement thereof, and, subject to the provisions hereinafter
               stated, the Company shall assume the defense of such action
               (including the employment of counsel, who shall be counsel
               satisfactory to such Holder or such underwriter or such person,
               as the case may be, and the payment of legal expenses) insofar as
               such action shall relate to any alleged liability in respect of
               which indemnity may be sought against the Company.  Any Holder or
               any underwriter or any such controlling person shall have the
               right to employ separate counsel in any such action and to
               participate in the defense thereof but the fees and expenses of
               such counsel shall not be at the expense of the Company unless
               the employment of such counsel has been specifically authorized
               by the Company, which authorization shall be given whenever the
               party seeking indemnity has been advised by its counsel that one
               or more legal defenses may be available to it that are not
               available to the Company or that for other reasons separate
               representation may be necessary, to avoid a conflict.  The
               Company shall not be liable to indemnify any person for any
               settlement of any such action effected without the consent of the
               Company.

               (ii) Any Holder will indemnify and hold harmless the Company,
               each of its directors and each of its officers who have signed
               the registration statement and each person, if any, who controls
               the Company within the meaning of the Securities Act from and
               against any and all losses, claims, damages, expenses of
               liabilities, joint and several, to which they are or any of them
               may become subject under the 

                                 Page 3 of 4


               Securities Act or under any other statute or at common law or 
               otherwise, and, except as hereinafter provided, will reimburse 
               the Company and each such director, officer or controlling 
               person for any legal and other expenses reasonably incurred by 
               any of them in connection with investigating or defending any 
               actions, whether or not resulting in any liability, insofar as 
               such losses, claims, damages, expenses, liabilities or actions 
               arise out of or are based upon any untrue statement or alleged 
               untrue statement of a material fact contained in the 
               registration statement, in any preliminary prospectus or in 
               the final prospectus (or the registration statement or 
               prospectus as from time to time amended or supplemented) or 
               arise out of or are based upon the omission or alleged 
               omission to state therein a material fact required to be 
               stated therein or necessary in order to make the statements 
               therein not misleading, but only insofar as any such statement 
               or omission was made in reliance upon and in conformity with 
               information furnished in writing to the Company in connection 
               therewith by such Holder expressly for use therein.  Promptly 
               after receipt of notice of the commencement of any action in 
               respect of which indemnity may be sought against any Holder, 
               the Company will notify such Holder in writing of the 
               commencement thereof, and such Holder shall, subject to the 
               provisions hereinafter stated, assume the defense of such 
               action (including the employment of counsel, who shall be 
               counsel satisfactory to the Company, and the payment of legal 
               expenses) insofar as such action shall relate to an alleged 
               liability in respect of which indemnity may be sought against 
               such Holder.  The Company and each such director, officer or 
               controlling person shall have the right to employ separate 
               counsel in any such action and to participate in the defense 
               thereof but the fees and expenses of such counsel shall not be 
               at the expense of such Holder unless the employment of such 
               counsel has been specifically authorized by such Holder, which 
               authorization shall be given whenever separate representation 
               may be necessary to avoid a conflict.  No Holder shall be 
               liable to indemnify any person or any settlement of any such 
               action effected without the consent of such Holder.

               (iii)     The indemnity provisions of this paragraph (e) shall be
               in addition to any liability the indemnitor may otherwise have.

     If the foregoing correctly sets forth our understanding, please sign below.

                         Very truly yours,

                         DYNECO CORPORATION,


                         By /s/ Donald Hewitt
                            ----------------------------------
                            Donald Hewitt, Assistant Secretary


Accepted as of the date written above:

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

- -----------------------------------
Warrant Holder(s)


                               DYNECO CORPORATION
                     5151 Edina Industrial Blvd - Suite 105
                              Minneapolis, MN 55439
                                  612-832-0832
                           Donald Hewitt 612-633-1501


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