Document:

NOT VALID UNLESS COUNTERSIGNED BY TRANSFER AGENT
              INCORPORATED UNDER THE LAWS OF THE STATE OF GEORGIA

NUMBER 1132                                     CUSIP NO. 285708 10 3

                                                        SHARES

"The shares  represented by this  certificate have not been registered under the
Securities Act of 1933, as amended. The shares have been acquired for investment
and may not be  offered,  sold or  otherwise  transferred  in the  absence of an
effective registration statement with respect to the shares or an exemption from
the registration requirements of said act that is then applicable to the shares,
as to which  prior  opinion  of  counsel  may be  required  by the issuer of the
transfer agent."

                         ELECTRONIC FUEL CONTROL, INC.
                   AUTHORIZED COMMON STOCK: 20,000,000 SHARES
                                PAR VALUE $.001

THIS CERTIFIES THAT

IS THE RECORD HOLDER OF

            Shares of common stock of Electronic Fuel Control, Inc.
transferable  on the books of the  Corporation  in person or by duly  authorized
attorney upon surrender of this Certificate properly endorsed.  This Certificate
is not valid until  countersigned  by the Transfer  Agent and  registered by the
Registrar.

     Witness the facsimile seal of the Corporation and the facsimile  signatures
of its duly authorized officers.

Dated:

_____________________                           _____________________
    Secretary                                       President

                         Electronic Fuel Control, Inc.
                                 Corporate Seal
                                    Georgia

INTERWEST TRANSFER CO. INC.    P.O. BOX 17136/SALT LAKE CITY, UTAH 84117
COUNTERSIGNED & REGISTERED

                               _________________________________________________
                               COUNTERSIGNED Transfer Agent-Authorized Signature

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NOTICE    Signature  must  be  guaranteed  by a  firm  which  is a  member  of a
          registered national stock exchange,  or by a bank (other than a saving
          bank), or a trust company. The following  abbreviations,  when used in
          the inscription on the face of this certificate, shall be construed as
          though they were written out in full  according to applicable  laws or
          regulations:

TEN COM - as tenants in common          UNIF GIFT MIN ACT - ....Custodian....
TEN ENT - as tenants by the entireties                      (Cust)      (Minor)
JT TEN - as joint tenants with right of            under Uniform Gifts to Minors
         survivorship and not as tenants           Act..........................
         in common                                            (State)

     Additional abbreviations may also be used though not in the above list.

       For Value Received, ________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
IDENTIFYING NUMBER OF ASSIGNEE
[                  ]

________________________________________________________________________________
  (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE OF ASSIGNEE)

________________________________________________________________________________

________________________________________________________________________________

__________________________________________________________________________Shares
of the capital stock represented by the within certificate, and do hereby
irrevocably constitute and appoint

________________________________________________________________________Attorney
to transfer the said stock on the books of the within named Corporation with
full power of substitution in the premises.

Dated:_________

        ________________________________________________________________
        NOTICE:  THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH
                 THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE
                 IN EVERY PARTICULAR WITHOUT ALTERATION OR ENLARGEMENT
                 OR ANY CHANGE WHATEVER.

"The shares  represented by this  certificate have not been registered under the
Securities Act of 1933, as amended. The shares have been acquired for investment
and may not be  offered,  sold or  otherwise  transferred  in the  absence of an
effective registration statement with respect to the shares or an exemption from
the registration requirements of said act that is then applicable to the shares,
as to which  prior  opinion  of  counsel  may be  required  by the issuer of the
transfer agent."LICENSE AGREEMENT BY AND BETWEEN THE DAVIS FAMILY
                     TRUST AND ELECTRONIC FUEL CONTROL, INC.

         This Agreement is made this the 13th day of May, 1996 by and between:
the DAVIS FAMILY TRUST, a Trust created and registered pursuant to and under the
rules and regulations of the Internal Revenue Service of the United States of
America, having a principal office at 8613 Roswell Road, Suite 201, P.O. Box
502287, Sandy Springs, Georgia, 31150,.Fulton.County, Georgia, (hereinafter
called "Licensor"), and ELECTRONIC FUEL CONTROL, INC., a corporation created
pursuant to and under the laws of the State of Georgia, having its principal
office at 4851 Highway 85, Suite 211, Forest Park, Georgia, 30050 (hereinafter
called "Licensee").

                                    RECITALS

         WHEREAS, Licensor owns the rights, title and interests in certain
letters patent of the United States, which letters patent are numbered
5,083.547, dated January 28, 1992, 5,370.097, dated December 6, 1994, and
5,408,978, dated April 25, 1995; and 5,103,795, dated April 14, 1992; and
4,479,466, dated October 30, 1984; and

         WHEREAS, said patents involve gaseous fuel and air mixing devices and a
process designed for use with the conversion of aspirated and non-aspirated
diesel engines to the use of compressed natural gas ("CNG"), liquefied natural
gas ("LNG") or propane, or to the conversion of such engines to the use of
multiple fuels; and

         WHEREAS, Licensor by virtue of said letters patent owns the

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rights, title and interest to the design, manufacture, sale, marketing, and
production of equipment, technology, systems, and processes represented thereby;
and

         WHEREAS, Licensor is a registered Trust within the meaning of the
Internal Revenue Code of 1986, as amended; and

         WHEREAS, Mark W. Crouch is the named Trustee of Licensor; and

         WHEREAS, Licensee is a corporation duly organized and existing under
the laws of the State of Georgia; and

         WHEREAS, Licensor and Licensee have reached an understanding and
agreement upon certain terms and conditions for the granting by Licensor to
Licensee of the right to produce, manufacture, sell and market the devices,
equipment, materials, products, process, and technology as represented by the
herein identified Letters Patent; and

         WHEREAS, pursuant to that agreement Licensee intends to acquire from
Licensor and Licensor intends to provide to Licensee, the right to produce,
manufacture, sell and market the devices, equipment, materials, products,
process, and technology represented by the herein identified Letters Patent; and

         WHEREAS, Licensee and Licensor wish to formalize their agreement and
understanding by reducing their agreement and understanding to written form; and
WHEREAS, for and in return for the right to manufacture, produce, sell and
market, the devices,-equipment, materials, products, process, and technology as
above set forth, Licensee

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shall pay to Licensor certain remuneration and, further, Licensee shall provide
Licensor with other benefits and advantages, as is more fully set forth herein;
and

         WHEREAS, this instrument shall not convey and is not intended to convey
any right, power or privilege to Licensee unless and until it shall be duly
signed and executed by the Trustee of Licensor;

         NOW, THEREFORE; for and in consideration of the mutual promises,
covenants, warranties, and agreements heretofore made and now set forth in this
Agreement, the parties hereto do hereby agree as follows:

                             ARTICLE 1 - DEFINITIONS

         Certain terms used in-this Agreement shall have. the following
specified meaning and definition:

a)   "Licensed Patent Rights" shall when used herein mean:

     (1) U.S. Patent Serial No. 5,083,547, dated January 28, 1992 for a natural
     gas and air mixing device, as assigned to Licensor; any divisions or
     continuations in whole or in part thereof; any U.S. patents or applications
     that are later added to this license; any patents issuing on any of such
     applications; any reissues or extensions or reexaminations of any such
     patents; and

     (2) U.S. Patent Serial No. 5,408,978, dated April 25, 1995, for a natural
     gas and air mixing device, as assigned to Licensor; any divisions or
     continuations in whole or in part thereof; any U.S. patent or applica-

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     tions that are later added to this license; any patents issuing on any of
     such applications; any reissues or extensions or reexaminations 'of any
     such patents; and

     (3) U.S. Patent Serial No. 5,370,097, dated December 6, 1994, for a duel
     fuel control system which controls the flow of liquid fuel alone or in
     combination with a gaseous fuel, as assigned to Licensor; any divisions or
     continuations in whole or in part thereof; any U.S. patent or applications
     that are later added to this license; any patents issuing on any of such
     applications; any reissues or extensions or reexaminations of any such
     patents; and

     (4) U.S. Patent Serial No. 5,103,795, dated April 14, 1992 for a natural
     gas and air mixing device, as assigned to Licensor; any divisions or
     continuations in whole or in part thereof; any U.S. patent or applications
     that are later added to this license; any patents issuing on any of such
     applications; any reissues or extensions or reexaminations of any such
     patents; and

     (5) U.S. Patent Serial No. 4,479,466, dated October 30, 1984 for a natural
     gas and air mixing device, as as signed to Licensor; any divisions or
     continuations in whole or in part thereof.; any U.S. patent or applications
     that are later added to this license; any patents issuing on any of such
     applications; any reissues or extensions or reexaminations. of any such
     patents;

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b) "Licensed Article" shall mean any article, whether or not consisting of one
or more separate units, produced, manufactured, made, used, marketed or sold
anywhere in the geographic territory specified herein, that is covered by any
unexpired patent, or is covered by one or more claims of a pending patent
application, which patent or application is part of the "Licensed Patent
Rights."

c) "Net Sales" shall mean the sum total of all charges invoiced to
customers of Licensed Articles sold by the Licensee and its affiliates,
sublicensees, agents or distributors less credits or refunds actually allowed
for damaged, outdated, or returned goods.

                        ARTICLE 2 -- LICENSE AND WARRANTY

         (a) Subject to each and every term, provision, condition, and
obligation herein specified and set forth, Licensor hereby grants, and agrees to
grant, to Licensee, within the territory hereinafter set forth, an exclusive
license under the "Licensed Patented Rights" to make, use, sell and lease
"Licensed Articles."

         (b) Licensor warrants and represents that it has title to the "Licensed
Patent Rights" and the right to enter into every term of this agreement.

                      ARTICLE 3 -- IMPROVEMENTS AND METHODS

Subject to and conditioned upon the terms and provisions of Article 2 of this
Agreement, Licensor agrees to tender, upon request of Licensee in writing, for
incorporation into the

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"Licensed Patented Rights" for use in the territory hereinafter specified, a
like license under any U.S: patent or patents applications now or hereafter
owned or enjoyed by Licensor which claims any improvement in any invention
disclosed in any patent or patent application included in the "Licensed Patented
Rights," or any method or process for manufacturing any such invention.

                             ARTICLE 4 -- ROYALTIES

         (a) Royalties. Licensee shall pay or cause to be paid to Licensor, at
the times and on the dates hereinafter specified, a of royalty in accordance
with the terms and provisions of this Article 4.

           (1) With respect to the Licensed articles identified in      (1)
      Article 1, subsection (a)(1), the royalty to be paid shall      $21.00
      be TWENTY-ONE AND NO/100THS ($21.00) DOLLARS per Licensed
      Article sold;

           (2) With respect to the Licensed Articles identified in      (2)
      Article 1, Subsection (a)(2), the royalty to be paid shall      $21.00
      be TWENTY-ONE AND NO/100THS ($21.00) DOLLARS per Licensed
      Article sold;

           (3) With respect to the Licensed Articles identified in      (3)
      Article 1, subsection (a)(3), the royalty to be paid shall     $150.00
      be ONE HUNDRED AND FIFTY AND N0/100THS ($150.00) per
      Licensed Article sold.

           (4) With respect to the Licensed Articles identified in      (4)
      Article 1, subsection (a)(4), the royalty to be paid shall      $21.00
      be TWENTY-ONE AND NO/100THS ($21.00) DOLLARS

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      per Licensed Article sold;

           (5) With respect to the Licensed Articles identified in      (5)
      Article 1, subsection (a)(5), the royalty to be paid shall      $21.00
      be TWENTY-ONE AND NO/100THS ($21.00) DOLLARS per Licensed
      Article sold;

Royalties shall be due and payable to Licensor without diminution or set off.

         (b) Commencing one year from the date this Agreement is signed by the
parties and continuing on the same day of each year thereafter until (i) this
Agreement is canceled or terminated in accordance with the terms and provisions
herein otherwise set forth, or (ii) royalties are otherwise no longer due and
payable under other provisions of this Agreement, the royalty to be paid
Licensor for each Licensed. Article shall be adjusted according to the following
terms and provisions:

         (1) Beginning one year after this Agreement is signed by the parties
and for the succeeding 12-month period thereafter (each successive twelve (12)
month period to be hereinafter referred to as the "Adjustment Period" the
royalty to be paid Licensor shall be equal to the purchasing power of the
royalty amount that is due and payable to Licensor for the last month in the
immediately preceding 12-month period (hereinafter referred to a the "Base
Month"). As soon as possible after the publication and issuance thereof,
Licensor shall deliver to Licensee a true copy of the Consumer Price Index for
the United States for All Urban Consumers for all items on the bureau of Labor
Statistics of the U.S.

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Department of Labor (hereinafter referred to as the "Index") for the Base Month
and for the calendar month in which the Adjustment Period commences (the
"Initial Adjustment Month"). If the Index for the Initial Adjustment Month shows
an increase in consumer purchasing power as compared to that for the Base Month,
Licensor shall deliver to Licensee a computation showing the increase in the per
unit royalty that shall be effective until the next adjustment period; said
increase to be an amount equal to the percentage increase in the Index for the
Initial Adjustment Month over the Index for the Base Month, multiplied by the
amount of royalty in effect for the last month of the previous 12-month period.
Any such increase shall be added to the royalty for each Licensed Article then
in effect and the sum obtained by adding the amount of any such increase to the
amount of the royalty then in effect for each Licensed Article shall thereafter
become the amount of per unit royalty to be paid by Licensee to Licensor for the
duration of that Adjustment Period. If the Adjustment Period begins on a day
other than the first day of the month, Licensee shall pay to Licensor on or
before the next date that royalties shall be due and payable, all royalties due
Licensor for such period of time that is less than one month. For the purpose of
this Agreement, the "Base Month" shall be May __________, 1997 . Notwithstanding
anything to the contrary contained herein, in no event shall the royalty amount
due Licensor be adjusted in an amount less than that initially set forth in
Article 4(a).

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         (c) The royalties herein otherwise specified under subparagraph (a) of
this Article and as adjusted under subparagraph (b) above shall, for such period
as is hereinafter set forth, be increased by an amount equal to SEVENTY-NINE AND
NO/100THS ($79.00) DOLLARS. This increase shall be paid to Licensor until such
time as the amount generated by such increase (i.e., $79.00) shall equal the sum
of ONE HUNDRED FIFTY THOUSAND AND NO/100THS ($150, 000. 00) DOLLARS plus
interest thereon at the rate of twelve (12%) percent per annum. When said sum
plus interest shall be reached, the royalty due Licensor under sub-paragraph (a)
of this Article and as adjusted under subparagraph (b) above shall revert to the
sums specified in said sub-paragraph (a) as adjusted under sub-paragraph (b) and
shall thereafter be due and payable as is otherwise herein set forth.

         (d) In addition to the royalties herein otherwise specified under
sub-paragraph (b) above and as additional consideration for the issuance of this
Agreement by Licensor, upon execution of this Agreement Licensee shall execute a
promissory note in substantially the form attached hereto as Exhibit A in the
principal sum of ONE HUNDRED FIFTY THOUSAND AND NO/100THS ($150,000.00) DOLLARS,
bearing interest at a rate of twelve percent (12%) per annum, which principal
and interest shall be due and payable in accordance with the terms and
provisions of said note. The funds represented by said promissory note are
intended to be and shall be construed to be a non-refundable payment to Licensor
disbursed by Licensee as consideration for

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execution of this Agreement and is in excess of and in addition to any and all
royalty payments otherwise due or to become due Licensor under this Agreement.

         (e) Time of payment. All royalties earned shall be paid not less than
monthly, with payment therefor being due and payable on the fifth business day
following the last business day of each ,such calendar month, beginning with the
calendar month in which this Agreement is executed. All royalty payments shall
be made to Licensor in a lump sum in cash or by cash equivalent, in currency of
the United States of America which currency shall be in the form, when paid,
which is legal tender for the payment of public and private debts. Each payment
made by Licensee shall be accompanied by a written report signed by the
individual who prepared the report and by an officer of Licensee, and by
financial statements of Licensee for the period for which such royalty is due,
showing the number of Licensed Articles sold for the applicable period. The
financial statements of Licensee shall be broken down into sales of those
Licensed Patented Articles specified in Article 1, subsection (a)(1); Article 1,
subsection (a)(2); and Article 1, subsection (a)(3). If financial statements of
Licensee are unavailable at the time any such royalty payment is made, such
financial statements shall be forwarded to Licensor as soon as they are ready
but in all events they shall be made available to Licensor not later than thirty
(30) days following the date the applicable royalty payment is due and payable.
The unavailability of financial statements shall not be cause for

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non-payment of any royalties then otherwise due. In the event such financial
statements are not available, Licensee shall make a good faith estimate of the
royalties due and shall pay over the amount of that good faith estimate in a
timely manner. Financial statements shall be prepared in accordance with
generally accepted accounting principles, but need not be audited.
Notwithstanding the foregoing, Licensee shall provide Licensor copies of annual
financial statements duly audited not later than three (3) calendar months
following the close of Licensee's fiscal year. Royalty payments shall be
adjusted annually, if necessary, based upon the audited financial statements of
Licensee, which audit shall be completed not later than three (3) calendar
months following the end of each fiscal year. Any overpayment of royalties as
adjusted by such audited financial statements shall be credited against the next
royalty payment due Licensor. Any underpayment of royalties as adjusted by such
audited financial statements shall be paid to Licensor not later than thirty
(30) days following the end of the first quarter following the fiscal year in
which such amount is due.

         (f) Leasing. If "Licensed Articles" are produced, sold, marketed, or
manufactured by Licensee or its designee which "Licensed Articles" are
ultimately marketed on a lease basis, all the provisions of this agreement shall
apply, including but not limited to the payment of royalties, and all sums
received by Licensee for any such leased "Licensed Articles" shall be included
within the financial statements of Licensee for all

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purposes. Any Licensed Article that is leased shall, for the purposes of
determining the payment of royalties, be deemed "sold" and royalty payments
thereon shall be due and payable as of the date of the final lease.

                        ARTICLE 5 -- REPORTING AND AUDIT

         Licensee shall keep or cause to be kept accurate books of account
containing all information necessary to establish the amount payable as royalty
under this agreement. Such books of account shall be kept at Licensee's
principal place of business within the State of Georgia and shall be open, for
three years following the close of the calendar year to which they pertain, to
inspection and audit by an independent certified public accountant who is
nominated by Licensor and to whom Licensee has no reasonable objection. Such
inspection and audit shall take place no more than once in each calendar year
and shall be confined to verification of the royalties due Licensor pursuant to
the terms, provisions, and agreements of the parties, including other agreements
between the parties that may hereafter be reduced to writing and signed by the
parties hereto. Any such audit shall be conducted during Licensee's usual and
customary business hours, and upon ten (10) days notice to Licensee. The
inspection and audit conducted by the independent certified public accountant
and the report issued by him shall be final and binding upon Licensee and upon
Licensor.

                            ARTICLE 6 -- INFRINGEMENT

         (a) Who shall sue. Upon learning of any infringement by any

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third party of any claim of any issued patent included within the "Licensed
Patent Rights," Licensee shall promptly notify Licensor in writing of such
infringement, giving details of the infringement. Licensor and Licensee each
shall have the option either alone or jointly to take such measures as may be
required to terminate or enjoin any infringement. When either party brings an
infringement suit, the other party may but shall not be required to join as
plaintiff but such non-joining party shall cooperate and assist in the
preparation and prosecution of the suit.

         (b) Expenses and recoveries. In the case of mutual agreement by
Licensor and Licensee on the institution of an infringement suit, Licensee shall
bear one half of all expenses associated therewith and Licensor shall bear one
half of all expenses associated therewith, unless one party declines to
participate financially in the prosecution of such infringement suit; in the
event one party declines to participate financially in the prosecution of such
infringement suit, the party declining to participate shall be excluded from
bearing a part of such expenses. In the case of such mutual agreement on the
institution of an infringement suit, Licensee shall have one half and Licensor
shall have one half of all damages and penalties recovered that remain after
first reimbursing Licensor and then Licensee for any amounts expended by them in
prosecuting such infringement suit. If Licensor or Licensee shall decline to
participate financially in the prosecution of such infringement suit, the party
so declining to participate shall be excluded from any

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share of the damages and penalties recovered.

                         ARTICLE 7 -- ADVERSE DECISIONS

         (a) Effect. If any claim of any patent included in the
"Licensed Patent Rights" is held invalid or is awarded to another, by a decision
of any tribunal of competent jurisdiction, which decision is not or cannot be
thereafter reversed or set aside, then the construction placed upon such claim
by such tribunal shall be followed from the date of entry of the opinion and
with respect to any claim that is not valid, or not the property of Licensor
under such decision, Licensee shall thereafter be relieved from the payment of
royalties solely with respect to such claim, and from including in its reports
hereunder any equipment or device covered solely by such claim; provided,
however, that (1) if there are conflicting final decisions by courts of equal
jurisdiction, the one of latest date shall be controlling and, (2) the amount by
which the payment of royalties is to be reduced shall be negotiated in good
faith between Licensor and Licensee. In any instance where Licensee is
successful in defending any patent included in the "Licensed Patent Rights" and
Licensor does not contribute one-half of the cost of such defense, all future
royalty payments to be made by Licensee to Licensor hereunder with respect to
the particular patent defended by Licensee shall be reduced by one half until
Licensee shall recover all such defense costs at which time the royalty payments
with respect thereto shall revert to the amounts herein set forth and shall
thereafter be paid according to each term and

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provision hereof.

         (b) In the. event that either or both Licensor and Licensee are
unsuccessful in defending against any claims of third parties, with respect to
and only to such claims as either or both are unsuccessful in defending against
Licensor will hold Licensee, its agents and sublicensees free from any claims,
demand, suits or causes of actions including, all judgments, damages and costs,
including reasonable attorneys fees, resulting therefore and arising out of the
use, manufacture, sale, or advertising of, any Licensed Articles.

         (c) Contrary decision. In the event of a decision of a tribunal
terminating royalty liability followed by a decision of a tribunal that revives
royalty liability, no royalty shall be payable for the period between the two
decisions.

                            ARTICLE 8 -- BEST EFFORTS

         Licensee shall in good faith use its best efforts to maximize the
number of "Licensed Articles" sold in the geographic territory to which this
Agreement applies.

                            ARTICLE 9 -- SUBLICENSES

         Licensee shall not without the prior written consent of Licensor have
any right to grant sublicenses under this Agreement, which consent shall not be
unreasonably withheld, and provided, however, that any sublicense shall be
subject in all respects to the restrictions, exceptions and termination
provisions contained in this Agreement.

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ARTICLE 10 -- TERM AND TERMINATION

         (A) This Agreement and the rights and licenses granted hereunder shall
continue until the later of the expiration of the last Patent hereby licensed
and any extensions thereof, except as is hereinbelow provided.

         (B) This Agreement may be terminated by either party upon the
occurrence of any of the events enumerated below by giving sixty (60) days'
written notice to the other party of its intent to terminate this Agreement,
which notice shall reference the subparagraph hereof relied upon by the party
seeking to terminate the Agreement. The noticed party shall have the right
within said sixty (60) days to cure said breach and within which to notify the
other party in writing of said cure.

         (1) In the event Licensee is adjudicated bankrupt or insolvent, enters
into a composition with creditors, makes an assignment of all or substantially
all of its assets for the benefit of its creditors, or if a receiver is
appointed for its assets;

         (2) In the event that Licensee refuses to produce or manufacture, sell,
market, or to cause to be produced or manufactured, sold, or, marketed the
Licensed Patented Articles;

         (3) In the event that any sublicensee of the Licensee is in material
breach or default of any provision of Article 10 of this Agreement which such
default or breach is not cured within the applicable time period granted herein;

         (4) Upon the failure or refusal of Licensee to pay Licensor the
royalties herein specified when and as they become due and

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payable;

         (5) Upon the failure of the Licensee to meet the quota(s) set forth in
Article 21 hereof;

         (6) If, prior to any public offering of the capital stock of Licensee
pursuant to the rules and regulations of the Securities and Exchange Commission
and without the prior written consent by Licensor, which consent will not be
unreasonably withheld, the control of Licensee shall vary from that currently
constituted and which results in the transfer of a majority of the shares of
capital stock of the Licensee which effectively or practically changes the
management and control of Licensee;

         (7) A material breach of this Agreement by Licensee, its affiliates,
sublicensees, agents or distributors or by Licensor;

         (8) In the event that further lawful performance of this agreement or
any part hereof by either party shall be rendered impossible by or as a
consequence of any law, regulation, order, rule, direction, priority, seizure,
allocations, requisitions, or any other official action by any department,
bureau, board, administration or political subdivision thereof having
jurisdiction over such party.

         (C) In the event this Agreement shall be terminated as provided in this
Article 10, Licensee shall duly account to Licensor for all royalties within
twenty (20) days after the expiration of any applicable cure period of such
termination and shall make an accounting to Licensor of the inventory of
Licensed Articles which it and any of its affiliates and sublicensees have

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on hand as of the date of such termination. Licensee, its affiliates and
sublicensees shall then have the right, for a period of one year after said
termination, to sell such inventory provided that such net sales shall be
subject to the royalty rates set forth above and so payable to Licensor.

         (D) All payments of royalties made to Licensor before the effective
date of any cancellation or termination of this Agreement shall belong to
Licensor and Licensee shall make no claim to or for any reimbursement thereof.

         (E) After any cancellation or termination of this license agreement,
the "Licensed Patent Rights" shall immediately revert to and become the sole and
exclusive property of Licensor.

                         ARTICLE 11 -- CONFIDENTIALITY

         The parties hereto understand and agree that, except for information
published for general dissemination to the public and for information usually
and customarily available from any public source, Licensee shall not, without
the prior written consent of Licensor, divulge, disclose, or otherwise furnish
to any person, firm, corporation, partnership, or other entity not a party
hereto (except where compelled to do so by a court of a competent jurisdiction)
any trade secret, confidential or other sensitive information concerning or
relating to Licensor or the "Licensed Patented Articles."

                     ARTICLE 12 -- NO CLAIM AGAINST PATENTS

         Licensee acknowledges and agrees that the terms and provisions of this
Agreement are not intended to grant nor shall they

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be construed as granting any past, present, or future claim against any of
Licensor's trademarks, trade names, patents, equipment, materials or products,
but is intended only as a license granted by Licensor to Licensee for and only
for the territory herein specified (or as may hereafter be agreed upon in
writing) on the terms, conditions, and provisions herein set forth. Accordingly,
Licensee agrees that it shall not make any claim against Licensor with respect
thereto.

                      ARTICLE 13 -- SUCCESSORS AND ASSIGNS

         This agreement shall bind, and inure to the benefit of, each of the
parties, and their respective successors in interest and assigns. No assignment
or attempted assignment by Licensee of this Agreement or of any right, duty;
interest, or obligation of Licensee as herein set forth shall be valid or
enforceable without the prior written consent of Licensor, which consent may be
granted or withheld by Licensor for no reason or for any reason.

           ARTICLE 14 -- INFORMATION CONCERNING LICENSED PATENT RIGHTS

         (a) Inspection. Licensor hereby grants, and agrees to grant, to
Licensee and its duly authorized agents, a power of inspection of all U.S.
patent applications included in the "licensed patent rights," and Licensor
further agrees to execute and deliver to Licensee such further documents as may
be reasonably needed by Licensee to carry out the intent of this provision.

         (b) Information. The parties agree to keep each other fully

                                      -19-

<PAGE>

informed of the progress of the prosecution of all U.S. patent applications, if
any, that are included in the "Licensed Patent Rights."

                              ARTICLE 15 -- NOTICES

         Licensee may send all notices and reports and other communications and
may make all payments under this license to Mark W. Crouch, Trustee, Davis
Family Trust, 8613 Roswell Road, Suite 201,.P.O. Box 502287, Sandy Springs,
Georgia, 31150, or to any successor trustee designated by him in written
communication or, in the event of his death or incapacity, to such successor
trustee as may be lawfully appointed or designated by a proper authority.
Licensor may send all notices, tenders, and other communications to Electronic
Fuel Control, Inc., 4851 Highway 85, Suite 211, Forest Park, Georgia, 30050 or
to such other address as Licensee may hereafter designate in writing by its
authorized representative(s). All notices and other communications mentioned or
referenced in this agreement, including royalty payments, may be mailed postpaid
to the last known address of the designated individual or entity. All notice
periods and other times for taking any action mentioned in this license shall
start on the day that such notice or other communication is actually mailed.

                            ARTICLE 16 -- ALTERATIONS

This agreement may not be altered, modified, or changed except by an instrument
in writing signed by (1) an authorized officer of the Licensee as a result of a
duly authorized vote of Licensee's Board of Directors and by (2) an authorized
repre-

                                      -20-

<PAGE>

sentative of the Licensor.

                            ARTICLE 17 -- WARRANTIES

         Unless required to do so under any federal or state law, Licensee
agrees that with respect to any "licensed patented article" it shall not issue
or cause to be issued or condone or permit any designee or sublicensee to issue
or cause to be issued any express or implied warranty or representation of
merchantability or fitness for a particular purpose to any person, firm,
corporation, partnership or other legally cognizable entity.

         Further, Licensee agrees that it shall not make any intentional or
willful misrepresentation in its sale, marketing, and distribution of Licensor's
products, supplies, materials, and conversion kits, or of any component thereof,
which in any way violates or transcends any federal law or statute enacted by
Congress or any state law or statute enacted by any one of the legislatures of
the various states of the United States; nor any rule or regulation of the
Environmental Protection Agency of the U.S. Government or any successor agency
created to fulfill the role now carried out by same, the Energy Department of
the U.S. Government or any successor agency created to fulfill the role now
carried out by same; any agency of any State, local, or municipal government or
political subdivision which has functions, roles, or purposes designed to
fulfill an exact, similar, or complimentary role at said level of government as
the Energy Department or the Environmental Protection Agency. Licensee does
hereby agree to hold harmless and indemnify Licensor, its offi-

                                      -21-

<PAGE>

cers, agents, representatives, insurers, servants, agents and employees from any
and all claims, actions, causes of action, loss, cost, damages, expense, bodily
and personal injury and property damages, loss of service, and all other
expenses and costs of whatsoever nature or kind, including without limiting the
generality of the foregoing actual attorneys fees, costs and expenses of
litigation, witness fees, and the like, on account of or resulting from or
arising out of any violation by Licensee of its duties, obligations, and
responsibilities as set forth in this Article 17 or elsewhere in any other
Article of this Agreement.

                             ARTICLE 18 -- INSURANCE

         Subject to the specified minimums herein set forth Licensee hereby
agrees that it shall at all times obtain, pay for, secure, and maintain product
liability insurance in such sums as Licensee shall deem sufficient to fully
indemnify and pay any and all claims for bodily injury or for property damage
made against Licensee or made against Licensor with respect to the Licensed
Patented Articles manufactured, sold, installed, and marketed by Licensee or by
any sublicensee, and from any claim made against Licensee or against Licensor by
any member of the consuming public who purchases, buys, or leases one or more of
the Licensed Patented Articles. Licensee shall be deemed to be in compliance
with this Article 18 if but only if Licensee shall obtain, secure, and pay for
product liability insurance which shall afford indemnity against claims for
bodily injury in a sum of not

                                      -22-

<PAGE>

less than FIFTEEN MILLION AND NO/100THS ($15,000,000.00) DOLLARS and against
claims for property damage in a sum of not less than FIVE MILLION AND NO/100THS
($5,000,000.00) DOLLARS. All such insurance, in addition to Licensee, shall name
Licensor as a named insured therein and shall contain a clause or language
prohibiting the issuer of each such policy from canceling said insurance during
the policy term without having first given at least thirty (30) days, prior
written notice to Licensor of any such cancellation. Said insurance shall be
purchased from a solvent and licensed insurance company authorized to do
business in the geographic territory set forth in Article 20 but protections and
coverages granted by said insurance shall extend to and shall be valid in every
jurisdiction contained within the territorial boundaries set forth in Article 20
hereof.

                          ARTICLE 19 -- NOT LEGAL AGENT

         (a) Licensee understands and agrees that by entering into this
Agreement it is not and shall not become the agent or legal representative of
Licensor for any purpose whatsoever and that the terms and provisions of this
Agreement are intended as and only as and shall be construed to be a contractual
relationship granting to Licensee only such rights and creating only such
obligations as are herein specifically set forth. In the event of a violation of
this covenant by Licensee, its agents, servants, employees, or representatives,
Licensee hereby agrees to hold harmless and indemnify Licensor, its officers,
agents, representatives, insurers, servants, and employees from any and

                                      -23-

<PAGE>

all claims, actions, causes of action, loss, cost, damages, expense, bodily and
personal injury and property damages, loss of service, and all other expenses
and costs of whatsoever nature or kind on account of or resulting from or
arising out of any such violation.

         (b) Licensee agrees that no term or provision of this Agreement grants
or is intended to grant any right or authority to Licensee to assume or to
create on behalf of Licensor any obligation, duty, or responsibility, express or
implied, to any party that is not a signatory to this agreement, nor to create
or assume any such obligation or responsibility, express or implied, on behalf
of or in the name of Licensor to any party not a signatory to this agreement,
nor to bind Licensor in any manner or thing to any person, firm, corporation,
partnership, or other entity that is not a signatory to this Agreement.

                       ARTICLE 20 -- GEOGRAPHIC TERRITORY

         This licensing Agreement covering the "Licensed Patented Rights" shall
encompass and be valid within and only within the boundaries of the continental
United States of America, Mexico, and in Canada. Licensee agrees that it shall
not outside the within specified geographic territory, without the prior written
consent of Licensor, manufacture, sell, market, or produce equipment,
technology, systems, and processes represented by the Licensed Patented
Articles. Excepting the geographic territory specified in the immediately
preceding sentence and any other geographic territory which on the effective
date of this Licens-

                                      -24-

<PAGE>

party upon such terms, conditions, and provisions as Licensor in its sole
discretion shall deem appropriate or advisable.

                              ARTICLE 21 -- QUOTAS

         During the Term of this Agreement Licensee hereby agrees to sell not
less than TWO THOUSAND FIVE HUNDRED (2,500), in the aggregate, Licensed Articles
during the first year this Agreement is in force; THREE THOUSAND FIVE HUNDRED
(3,500), in the .aggregate, Licensed Articles during the second year this
Agreement is in force; FOUR THOUSAND FIVE HUNDRED (4,500), in the aggregate,
Licensed Articles during the third year this Agreement is in force; FIVE
THOUSAND FIVE HUNDRED (5,500), in the aggregate, Licensed Articles during the
fourth year this Agreement is in force; SIX THOUSAND FIVE HUNDRED (6,500), in
the aggregate, Licensed Articles during the fifth Year this Agreement is in
force; SEVEN THOUSAND FIVE HUNDRED (7,500), in the aggregate, Licensed Articles
during the sixth year this Agreement is in force; EIGHT THOUSAND FIVE HUNDRED
(8,500), in the aggregate, Licensed Articles during the seventh year this
Agreement is in force; TEN THOUSAND (10,000), in the aggregate, Licensed
Articles during the eighth year this Agreement is in force; and for each
successive year thereafter, TEN THOUSAND (10,000), in the aggregate, Licensed
Articles. For the purpose of this Article 21 the term "year" shall mean the 365
consecutive day period following the execution hereof and each successive 365
consecutive day period occurring thereafter.

                                      -26-

<PAGE>

                        ARTICLE 22 -- CORPORATE APPROVALS

         Licensee represents and warrants that the execution of this Agreement
by its corporate officers identified below has been duly authorized by
Licensee's board of directors, that execution of this Agreement is not in
conflict with any Bylaw or other agreement to which Licensee is a party and that
the terms and provisions specified herein will be a binding obligation of
Licensee, enforceable in accordance with its terms.

                          ARTICLE 23 -- TRUST AUTHORITY

         Licensor represents and warrants that the execution of this Agreement
by its trustee named below is duly authorized by the trust instrument, is not in
conflict with the trust instrument or with any other agreement to which the
Trust is signatory, and will be a binding obligation of Licensor, enforceable in
accordance with its terms.

                         ARTICLE 24 -- ENTIRE AGREEMENT

         With respect to the issuance of the license rights granted Licensee by
Licensor hereunder, this Agreement supersedes any and all agreements, whether
oral or written, between the parties hereto and each party hereto hereby
acknowledges that no representations, inducements, promises or agreements,
orally or otherwise, have been made by any party hereto or anyone acting on
behalf of any party hereto, which are not embodied herein, and that no other
agreement, statement or promise with respect to such license rights not
contained in this Agreement shall be valid and binding.

                                      -27-

<PAGE>

                        ARTICLE 25 -- PARTIAL INVALIDITY

         If any provision of this Agreement is or shall be held by any court of
competent jurisdiction to be invalid, void, or unenforceable, the remaining
provisions of this Agreement shall nevertheless continue in full force and
effect without being impaired or invalidated in any way.

                          ARTICLE 26 -- ATTORNEYS' FEES

         Should litigation be commenced between the parties hereto or their
personal representatives concerning any of the terms or provisions of this
Agreement or the rights and duties of the parties hereto in relation thereto,
the party prevailing in such arbitration or litigation shall be entitled, in
addition to such other relief as may be granted, to a reasonable sum as and for
its or their attorneys' fees in such litigation. The amount of any such
attorneys' fees shall be determined by the court (but not the jury).

                           ARTICLE 27 -- CHOICE OF LAW

         This agreement and any disputes arising under it shall be governed by
and interpreted under the law of the State of Georgia.

                          ARTICLE 28 -- BINDING NATURE

         This Agreement shall be binding upon and inure to the benefit of the
parties thereto and their respective representatives, heirs, successors and
assigns.

                           ARTICLE 29 -- COUNTERPARTS

         This agreement may be executed in one or more counterparts,

                                      -28-

<PAGE>

each of which shall be deemed to be an original but all of which together shall
constitute but one and the same instrument.

         IN WITNESS WHEREOF, the parties hereto have executed this agreement by
affixing respectively the signature of a duly authorized officer of Licensee and
the Trustee of the Davis Family Trust, this the 20 day of June, 1996 to be
effective as of the 1 day of June, 1996.

                                                   ELECTRONIC FUEL CONTROL, INC.

                                                   /s/ Robby E. Davis
                                                   ----------------------------
                                                   Its president

/s/ Joseph L. Benedello
-----------------------------
Witness

----------------------------
Attested to:                                                CORPORATE SEAL

/s/ Jeffrey F. Davis
----------------------------
Corporate Secretary

                                                   THE DAVIS FAMILY TRUST

                                                   /s/ Mark W. Crouch
                                                   ----------------------------
                                                   Mark W. Crouch, Trustee

/s/Judy L. Barrow
----------------------------
Witness

                                      -29-

<PAGE>

                             SECRETARY'S CERTIFICATE

         THE UNDERSIGNED HEREBY CERTIFIES individually and on behalf of
Electronic Fuel Control, Inc., a Georgia corporation (the "Corporation"), and in
connection with the execution of a certain license agreement made by the Davis
Family Trust in favor of the Corporation dated May 13, 1996, and a promissory
note made by the Corporation in favor of the Davis Family Trust which will be
dated as of May 13, 1996, that I am the Assistant Secretary of the Corporation
and that attached hereto as Exhibit A is a true and correct copy of resolutions
adopted by the Unanimous Written Consent of the Board of Directors of the
Corporation dated June 3, 1996, that such resolutions are the only resolutions
of the Board of Directors or the stockholders of the Corporation dealing with
the subject matter thereof and the such resolutions have not been amended or
rescinded and are now in full force and effect.

         IN WITNESS WHEREOF, I have hereunto set my hand and the seal of the
Corporation this 25th day of July, 1996.

                                           William P. Ruffa, Assistant Secretary

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