TELETRAK ADVANCED TECHNOLOGY SYSTEMS INC
8-K, 1999-02-22
NON-OPERATING ESTABLISHMENTS
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<PAGE>


                          SECURITIES AND EXCHANGE COMMISSION

                               Washington, D.C.  20549

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

                                       FORM 8-K

                                    CURRENT REPORT

        PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

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

                         Date of report:  November 18, 1998
                         (Date of earliest event reported)


                        TELETRAK ENVIRONMENTAL SYSTEMS, INC.
               (Exact name of Registrant as specified in its charter)


                                      Delaware
                   (State or other jurisdiction of incorporation)


          0-13670                                   13-3187778
   (Commission File No.)                (I.R.S. Employer Identification No.)


                                   2 Sutton Road
                            Webster, Massachusetts 01570
                 (Address of principal executive offices; zip code)

                                   (508) 943-5001
                (Registrant's telephone number, including area code)


                     Teletrak Advanced Technology Systems, Inc.
                                 537 Steamboat Road
                            Greenwich, Connecticut 06830
           (Former Name or Former Address, if changed Since Last Report)

<PAGE>

ITEM 2.   ACQUISITION OR DISTRIBUTION OF ASSETS

     On November 18, 1998, Helm Capital Group Inc., ("Helm") and its
majority-owned subsidiary, Teletrak Advanced Technology Systems, Inc., a
Delaware corporation (the "Company"), completed its previously announced merger
(the "Merger") with Advanced Environmental Systems, Inc., a Massachusetts
corporation ("AES"), pursuant to an Agreement and Plan of Merger dated as of
July 24, 1998.

     AES, a privately-held company, specializes in the manufacture, distribution
and licensing of industrial "mucking pumps" and related equipment.  The design
of these pumps, based upon jet pump technology, makes this equipment a highly
effective portable tool for the removal of granular wet or dry materials
(including sludge, scale and slurries), particularly for environmental cleanup
of hazardous matter such as asbestos and lead.  The motive power, compressed air
or pressurized liquid, provides operating flexibility for hopper loading, vacuum
cleaning and submersible application, as well as the ability to collect and
transport materials over long distances.  With no moving parts, the AES pump is
designed to be virtually maintenance free and to require no skilled labor to
operate.  More than 1,000 pumps are in use today in a wide range of industries,
including power plants, steel mills and foundries, oil refineries, chemical and
petrochemical plants, food processing facilities, shipyards and marine vessel
operators and water treatment plants.  In 1997, AES reported sales of $1,217,000
and a net loss of $464,000. For the six months ended June 30, 1998, AES has
reported sales of $867,000 and a net profit of $52,400.

     In connection with the Merger, AES became a wholly-owned subsidiary of 
the Company, and the existing shareholders of AES received an aggregate of 
3,750,000 shares of the Company's common stock in exchange for their AES 
stock.  In connection with the Merger, the Company sold to certain AES 
stockholders or affiliates, at a purchase price (the "Purchase Price") of 
$0.50 for one share of common stock and one warrant to purchase one-half of 
one share of common stock, 1,000,000 shares of common stock plus warrants 
("Warrants") to purchase up to 500,000 shares of common stock.  The Warrants 
are exercisable any time prior to the third anniversary of their date of 
issuance at an exercise price of $2.00 per share.  In addition, the Company 
also sold to Herbert M. Pearlman and certain other affiliates, at the 
Purchase Price, 250,000 shares of common stock and 125,000 Warrants.  Prior 
to the Merger, the Company distributed to the pre-Merger stockholders of the 
Company one-half of one Warrant for each share of common stock held by them 
upon the effectiveness of the Merger, and 500,000 Warrants were issued to 
Helm and the Company's former management for pro rate distribution.

     Prior to the Merger, on September 28, 1998, the Company (i) effected a
ten-for-one reverse stock split; (ii) changed the par value of its capital stock
to $.001; and (iii) established the number of its authorized shares of capital
stock after the reverse stock split to 30,000,000.  Immediately prior to the
Merger, the Company changed its name to "Teletrak Environmental Systems, Inc."

     In connection with the Merger, Herbert M. Pearlman, David S. Lawi, Joseph
J. Farley and William Lerner resigned from the Board of Directors of the
Company.  Added to the Board of Directors by designation of AES were Gerald P.
McNamara, Gerd E. Reinig, Heinz Buhr, Glen


                                          2
<PAGE>

Wegner and William Gagnon. Added to the Board of Directors by designation of 
Helm was Fred Zeidman and Daniel Murphy.  In addition, all officers of the 
Company resigned and were replaced with the following AES representatives: 
Gerald P. McNamara, President and Chief Operating Officer; Gerd E. Reinig, 
Chairman and Chief Executive Officer;  and Marcelle J. Landry, Secretary.

ITEM 7.   FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS

     (a)  FINANCIAL STATEMENTS OF BUSINESS ACQUIRED.

     The audited financial statements of AES for the years ended December 31,
1996 and 1997 are as follows:













                                          3
<PAGE>


                            [LETTERHEAD OF BARIL & SMITH]






                                             May 29, 1998


To the Board of Directors and Stockholders of
Advanced Environmental Systems, Inc.

                             INDEPENDENT AUDITOR'S REPORT
                             ----------------------------

We have audited the accompanying balance sheets of Advanced Environmental
Systems, Inc. as of December 31, 1997 and 1996 and the related statements of
operations and stockholders' equity and cash flows for the years then ended. 
These financial statements are the responsibility of the Company's management. 
Our responsibility is to express an opinion on these financial statements based
on our audit.

We conducted our audits in accordance with generally accepted auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation. 
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of Advanced Environmental Systems,
Inc. as of December 31, 1997 and 1996, and the results of its operations and
cash flows for the years then ended in conformity with generally accepted
accounting principles.

                                   /s/ Baril & Smith
                                   Woburn, Massachusetts



                                          4
<PAGE>

                        ADVANCED ENVIRONMENTAL SYSTEMS, INC.
                                   BALANCE SHEETS
                             DECEMBER 31, 1997 AND 1996


                                        ASSETS
                                                        1997          1996
                                                     ----------    ----------
Current assets:
  Cash                                               $    5,777    $   15,974
  Accounts receivable, less allowance 
   for doubtful accounts of $15,000 in 1997             235,217       138,652
  Stock subscription receivable                                       375,000
  Inventory (Note 2)                                    491,980       144,716
  Prepaid expenses                                       21,254        12,496
                                                     ----------    ----------

    Total current assets                                754,228       686,838
                                                     ----------    ----------


Property and equipment (Note 3)                         273,311       149,782
  Less - Accumulated depreciation                        43,688        10,907
                                                     ----------    ----------
                                                        229,623       138,875
                                                     ----------    ----------

Investment in affiliate (Note 7)                         23,000
                                                     ----------

                                                     $1,006,851    $  825,713
                                                     ==========    ==========

                         LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Note payable (Note 4)                              $  290,000
  Current portion of long-term debt (Note 5)             24,416    $    9,918
  Accounts payable                                      314,629        16,864
  Due to affiliate                                       32,254        13,200
  Accrued income taxes                                                  4,100
                                                     ----------    ----------

    Total current liabilities                           661,299        44,082
                                                     ----------    ----------
Other liabilities:
  Deferred credit facility (Note 7)                      61,992
  Long-term debt (Note 5)                                62,656        92,358
  Deferred income taxes                                                 4,000
                                                     ----------    ----------

                                                        124,648        96,358
                                                     ----------    ----------
Commitments (Note 7)
Stockholders' equity:
  Common stock, no par value:
  Authorized -  200,000 shares  
    issued and outstanding - 10,000 shares              690,128       690,128
  Accumulated deficit                                  (469,224)       (4,855)
                                                     ----------    ----------

                                                        220,904       685,273
                                                     ----------    ----------

                                                     $1,006,851    $  825,713
                                                     ==========    ==========

                   Read Accompanying Notes and Accountants' Report

                                          5
<PAGE>

                        ADVANCED ENVIRONMENTAL SYSTEMS, INC.
                              STATEMENTS OF OPERATIONS
                   FOR THE YEARS ENDED DECEMBER 31, 1997 AND 1996


                                                        1997          1996
                                                     ----------    ----------

Net sales                                            $1,216,886    $  749,383

Cost of goods sold                                      808,891       388,803
                                                     ----------    ----------

Gross margin                                            407,995       360,580

Selling, general and administrative expenses            867,969       332,788
                                                     ----------    ----------

(Loss) income from operations                          (459,974)       27,792
                                                     ----------    ----------
Other expenses:
  Litigation settlement (Note 8)                                       20,836
  Interest expense                                        8,395         3,711
                                                     ----------    ----------

                                                          8,395        24,547
                                                     ----------    ----------

Net (loss) income before provision for income taxes    (468,369)        3,245

Provision (credit) for income taxes (Note 6)             (4,000)        8,100
                                                     ----------    ----------

Net loss                                             $ (464,369)   $   (4,855)
                                                     ==========    ==========


                   Read Accompanying Notes and Accountants' Report

                                          6
<PAGE>

                        ADVANCED ENVIRONMENTAL SYSTEMS, INC.
                         STATEMENTS OF STOCKHOLDERS' EQUITY
                   FOR THE YEARS ENDED DECEMBER 31, 1997 AND 1996


                                   SHARES        COMMON STOCK      ACCUMULATED
                                OUTSTANDING      NO PAR VALUE        DEFICIT    
                                -----------      ------------      -----------

Issuance of 3,400 common shares 
  in exchange for inventory,
  patterns and molds                 3,400        $ 120,000

Issuance of 3,400 common shares 
  in exchange for machinery and
  equipment                          3,400          101,000

Issuance of 1,700 common shares
  for cash                           1,700           94,128

Issuance of 1,500 common shares
  for cash                           1,500          375,000

Net loss                                                            $  (4,855)
                                 ---------        ---------         ---------

Balance December 31, 1996           10,000          690,128            (4,855)

Net loss                                                             (464,369)
                                 ---------        ---------         ---------

Balance December 31, 1997           10,000        $ 690,128         $(469,224)
                                 =========        =========         =========



                   Read Accompanying Notes and Accountants' Report

                                          7
<PAGE>

                        ADVANCED ENVIRONMENTAL SYSTEMS, INC.
                              STATEMENTS OF CASH FLOWS
                   FOR THE YEAR ENDED DECEMBER 31, 1997 AND 1996


                                                        1997          1996
                                                     ----------    ----------
OPERATING ACTIVITIES
  Net loss                                           $ (464,369)   $   (4,855)
  Adjustments to reconcile net loss to net 
    cash used by operating activities:
      Depreciation and amortization                      32,781        10,907
      Deferred income tax                                (4,000)        4,000
      Provision for doubtful accounts                    15,000

  (Increase) decrease in operating assets:
    Accounts receivable                                (111,565)      (64,716)
    Inventory                                          (347,264)       16,864
    Prepaid expenses                                     (8,758)     (138,652)
  Increase (decrease) in operating liabilities:
    Accounts payable                                    297,465        13,200
    Accrued  expenses                                    10,800       (12,496)
    Accrued income taxes                                 (3,800)        4,100
                                                     ----------    ----------

 Net cash used by operating activities                 (583,710)     (171,648)
                                                     ----------    ----------
INVESTING ACTIVITIES
  Investment in affiliate                               (23,000)
  Purchase of property and equipment                   (123,529)       (6,160)
                                                     ----------    ----------

Net cash used by investing activities                  (146,529)       (6,160)
                                                     ----------    ----------
FINANCING ACTIVITIES
  Advances from affiliate                               125,000
  Repayment to affiliate                                (54,754)
  Proceeds from note payable                            290,000       100,000
  Proceeds from sale of common stock                    375,000        94,128
  Repayment of long-term debt                           (15,204)         (346)
                                                     ----------    ----------

 Net cash provided by financing activities              720,042       193,782
                                                     ----------    ----------

(Decrease) increase in cash                             (10,197)       15,974

Cash at beginning of year                                15,974
                                                     ----------    ----------

Cash at end of year                                  $    5,777    $   15,974
                                                     ==========    ==========

Supplemental disclosure of cash flow information:
  Cash paid during year for:
    Interest expense                                 $   12,497    $    3,711


                   Read Accompanying Notes and Accountants' Report

                                          8
<PAGE>

                        ADVANCED ENVIRONMENTAL SYSTEMS, INC.
                           NOTES TO FINANCIAL STATEMENTS
                             DECEMBER 31, 1997 AND 1996


NOTE 1 - BUSINESS ACTIVITIES AND ACCOUNTING POLICIES

     BUSINESS ACTIVITIES

     The Company was incorporated under the laws of the Commonwealth of
Massachusetts on January 4, 1996 and is engaged in the marketing distribution
and licensing of industrial pumps and related equipment.  The product is
manufactured on a subcontract basis.

     ACCOUNTING POLICIES

     The significant accounting policies utilized by the Company are described
below:

     REVENUE RECOGNITION

     The Company records sales and related cost of sales at the time of
shipments if all conditions for a sale are met.  Shipments on a consignment on
demonstration basis are carried in inventory until a sale to a third party.

     USE OF ESTIMATES

     The process of preparing financial statements in conformity with generally
accepted accounting principles requires the use of estimates and assumptions
regarding certain types of assets, liabilities, revenues and expenses.  Such
estimates primarily relate to unsettled transactions and events as of the date
of the financial statements.  Accordingly, upon settlement, actual results may
differ from estimated amounts.

     INVENTORY

     Inventory, which consists primarily of industrial pumps and related parts,
is stated at first-in, first-out (FIFO) cost.

     PROPERTY AND EQUIPMENT

     Property and equipment is stated at cost and depreciation is provided using
the straight-line and accelerated methods.  Expenditures for repairs and
maintenance are charged to operations as incurred.  Renewals and betterments
which extend the lives of the assets are capitalized.  The cost of property
retired or sold, together with the related accumulated depreciation, is removed
from the appropriate accounts and any resulting gain or loss is included in
operations.



                                          9
<PAGE>

NOTE 1 - BUSINESS ACTIVITIES AND ACCOUNTING POLICIES - CONTINUED

     INCOME TAXES

     Deferred income tax assets and liabilities arise from temporary differences
between the financial reporting and tax basis of assets and liabilities that
result in net taxable or deductible amounts in future periods.  Deferred taxes
are classified as current or noncurrent, depending on the classification of the
assets and liabilities to which they relate.  Deferred taxes arising from
temporary differences that are not related to an asset or liability are
classified as current or noncurrent depending on the periods in which the
temporary differences are expected to reverse.

     ADVERTISING

     The Company follows the policy of charging the costs of advertising to
expense as incurred.


NOTE 2 - INVENTORY

     Inventory at December 31, 1997 and 1996 consist of the following:

                                                        1997          1996
                                                     ----------    ----------

     Components and replacement parts                 $447,010      $100,011
     Finished goods                                     44,970        44,705

                                                      $491,980      $144,716
                                                      ========      ========

NOTE 3 - PROPERTY AND EQUIPMENT

     The cost of property and equipment and the estimated useful lives used for
computing depreciation at December 31, 1997 and 1996:

                                   ESTIMATED
                                  USEFUL LIFE       1997          1996
                                   ----------    ----------    ----------

Machinery and equipment               7 years    $  193,097    $  141,600
Office equipment                    3-7 years        58,657         8,182
Motor vehicles                        5 years        21,557
                                                 ----------    ----------

                                                 $  273,311    $  149,782
                                                 ==========    ==========

NOTE 4 - NOTE PAYABLE

The Company has a $300,000 revolving line of credit with a bank.  The loan
agreements provides for interest payable at the bank's prime rate plus 1.5% and
is secured by all assets of the Company and the personal guarantees of the
Company's stockholders.  The revolving credit agreement is renewable annually on
May 31, 1998.



                                          10
<PAGE>

NOTE 5 - LONG-TERM DEBT

Long-term debt at December 31, 1997 and 1996 consist of the following:

                                                            1997        1996
                                                         ----------  ----------

Note payable to bank with interest at prime plus 2% 
(10.5%) secured by all assets of the Company and 
the personal guarantees of the Company's shareholders, 
due in monthly principal installments of $1,959, plus
interest through October 1, 2001.  Financial performance
covenants relative to debt service and leverage exist.      $86,164    $100,000

Obligation under capital lease secured by computer
equipment payable in 24 installments of $149, including
interest.                                                       908       2,276
                                                         ----------  ----------

                                                             87,072     102,276
Less - Amounts due within one year                          (24,416)     (9,918)

                                                         $   62,656  $   92,358
                                                         ==========  ==========

     The aggregate principal maturities for the years subsequent to December 31,
1997 are as follows:

     1999                     $23,508
     2000                      23,508
     2001                      15,640

     The Company is not in compliance with certain financial performance
covenants as required by it's lending agreement. The bank is aware of this and
is working with the Company to resolve.


NOTE 6 - INCOME TAXES

     The credit for income taxes represents the reversal of the prior year
deferred tax liability. The Company has a net operating loss carryforward of
approximately $450,000 which is available for fifteen years. The potential
future tax benefit of $150,000 has been offset by a valuation reserve.


NOTE 7 - RELATED PARTY TRANSACTIONS

     On February 14, 1997, the Company entered into a ten year exclusive sales
and distribution agreement with a stockholder for sale of the Company's products
in Europe.  The Company will offer this distributor a 5% discount from list
price in return for an accelerated payment schedule.


                                          11
<PAGE>

NOTE 7 - RELATED PARTY TRANSACTIONS - CONTINUED

     DEFERRED CREDIT FACILITY

     As part of a private placement equity financing closed in February 1997 the
Company received a deferred credit facility of $125,000 from the shareholder. 
The Company has agreed to sell the shareholder products at a sales value of
$125,000 over a three year period.  The credit facility is non-interest bearing
and payable through sales discounts over a three year period.

     INVESTMENT IN ECO-JET

     In 1997, the Company acquired a 15% interest in a European distributor
whose majority ownership is held by a shareholder of the Company.  Consideration
for the investment of $23,000 is evidenced by a credit taken on sale made to the
distributor.

     FACILITIES

     The Company occupies office and assembly space in a facility owned by a
stockholder.  Approximately 4,000 square feet is occupied as a tenant at will. A
charge of $24,000 representing rent and utilities has been made.


NOTE 8 - LITIGATION

     A litigation claim was settled by the Company in 1997 for settlement of
$10,000. 


NOTE 9 - PURCHASE OF UNIQUE TOOL PRODUCT LINE

     On May 8, 1997, the Company purchased certain assets consisting of
inventory, fixed assets, tooling, demo equipment, patent rights and other assets
for a total consideration of approximately $208,000 of which $65,000 was paid at
closing.  The balance is due within a one year period as the inventory is sold.


NOTE 10 - PROPOSED MERGER

     In December 1997, the Company signed a letter of intent to enter into a
merger with Teletrak Advanced Technology Systems, Inc. (Teletrak).  The merger
is proposed to be a tax free transaction and Advanced Environmental Systems,
Inc. (AESI) will be the surviving corporation. The merger is expected to be
completed in the second quarter of 1998.


NOTE 11 - SUBSEQUENT EVENTS

     On March 19, 1998, the Company agreed to sell its affiliate Eco-Jet, pumps
having a sales value of $200,000. The transaction is intended to assist the
Company with cash flows needs.

     In May, 1998, the Company entered into an agreement to be a sales
representative for a manufacturer and purchase inventory with a list price of
$50,000. The agreement stipulates that if the Company makes purchases totaling
$250,000 by June 30, 2000, all rights to manufacture the product will be
transferred to the Company.


                                          12

<PAGE>

     (b)  PRO FORMA FINANCIAL INFORMATION.

     Unaudited pro forma financial information to be filed by amendment.

     (c)  EXHIBITS.

Exhibit
Number                             Exhibit Title
- -------                            -------------

3.1            Certificate of Amendment to Certificate of Incorporation 

10.1           Agreement and Plan of Merger

10.2           Form of Warrant






                                          13
<PAGE>

                                      SIGNATURES


     Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

Dated:  February 22, 1999


                              TELETRAK ENVIRONMENTAL SYSTEMS, INC.
                              (Registrant)


                              By: /s/ Gerd E. Reinig
                                   ------------------------------------
                                   Gerd E. Reinig
                                   Chief Executive Officer







                                          14
<PAGE>


                                    EXHIBIT INDEX
                                    -------------


Exhibit
Number                             Exhibit Title
- -------                            -------------

3.1            Certificate of Amendment to Certificate of Incorporation 

10.1           Agreement and Plan of Merger

10.2           Form of Warrant


















                                          15

<PAGE>


                                                                   Exhibit 3.1


                            CERTIFICATE OF AMENDMENT
                                      OF
                          CERTIFICATE OF INCORPORATION
                                      OF
                   TELETRAK ADVANCED TECHNOLOGY SYSTEMS, INC.

     Pursuant to the provisions of Section 242 of the Delaware Corporation 
Law, the undersigned, being the President and Secretary of Teletrak Advanced 
Technology Systems, Inc., a Delaware corporation (the "Corporation"), hereby 
certify as follows:

     FIRST: The name of the Corporation is Teletrak Advanced Technology 
Systems, Inc.

     SECOND: The amendments to the Certificate of Incorporation of the 
Corporation effected by this Certificate of Amendment are as follows:

     Paragraph First of the Certificate of Incorporation, relating to the 
name of the Corporation, is hereby amended to read as follows:

          FIRST: The name of the corporation is TELETRAK ENVIRONMENTAL 
          SYSTEMS, INC.

     Paragraph Fourth of the Certificate of Incorporation, relating to the 
authorized capital stock of the Corporation, is hereby amended to read as 
follows:

          FOURTH: The aggregate number of shares of capital stock which the 
Corporation shall have authority is issue shall be thirty million 
(30,000,000), which shall be classified as follows: twenty five million 
(25,000,000) shares of Common Stock (the "Common Stock") and five million 
(5,000,000) shares of Preferred Stock, (the "Preferred Stock") and the par 
value of each such share is $.001. The board of directors may authorize the 
issuance from time to time of the Preferred Stock in one or more series and 
with such designations, preferences, relative, participating, optional and 
other special rights, and qualifications, limitations or restrictions (which 
may differ with respect to each series) as the board may fix by resolution.

     THIRD: That the foregoing amendments to the Certificate of Incorporation 
were duly adopted under Section 242 of the Delaware Corporation Law by the 
affirmative vote of a majority of the outstanding shares entitled to vote 
thereon by written consent dated July 2, 1998, said authorization being 
subsequent to the affirmative vote of the Board of Directors.

     FOURTH: That the capital of the Corporation will not be reduced under or 
by reason of the foregoing amendments.

     IN WITNESS WHEREOF, we hereunto sign our names and affirm that the 
statements made herein are true under penalties of perjury, this 28th day of 
September, 1998.


                                                 /s/ Herbert Pearlman
                                                 ----------------------------
                                                 President - Herbert Pearlman

ATTEST:


/s/ David Lawi
- -----------------------
Secretary - David Lawi


<PAGE>
                                                                    Exhibit 10.1



================================================================================


                          AGREEMENT AND PLAN OF MERGER

                                 BY AND BETWEEN

                      ADVANCED ENVIRONMENTAL SYSTEMS, INC.,

                   TELETRAK ADVANCED TECHNOLOGY SYSTEMS, INC.,

                            HELM CAPITAL GROUP, INC.

                                       AND

                              AES ACQUISITION CORP.

                            DATED AS OF JULY 24, 1998


================================================================================

<PAGE>

                                TABLE OF CONTENTS

                                                                            PAGE

                                    ARTICLE 1

                                   THE MERGER

   Section 1.1.      The Merger..............................................  1
   Section 1.2.      Effects of the Merger...................................  1
   Section 1.3.      Effective Time of the Merger............................  2
   Section 1.4.      Directors...............................................  2
   Section 1.5.      Officers................................................  2
   Section 1.6.      Tax Consequences........................................  2
   Section 1.7.      Taking of Necessary Action; Further Action..............  2

                                    ARTICLE 2

                               TREATMENT OF SHARES

   Section 2.1.      Effect of the Merger on Capital Stock...................  2
   Section 2.2.      Issuance of New Certificates............................  3

                                    ARTICLE 3

                                   THE CLOSING

   Section 3.1.      Closing.................................................  4

                                    ARTICLE 4

                      REPRESENTATIONS AND WARRANTIES OF AES

   Section 4.1.      Organization and Qualification..........................  4
   Section 4.2.      Subsidiaries; Interests in Other Persons................  4
   Section 4.3.      Capitalization..........................................  4
   Section 4.4.      Authority; Non-Contravention; Statutory Approvals;
                      Compliance.............................................  5
   Section 4.5.      Financial Statements....................................  6
   Section 4.6.      Absence of Certain Changes or Events....................  6
   Section 4.7.      Litigation..............................................  7
   Section 4.8.      Tax Matters.............................................  7
   Section 4.9.      Employee Matters........................................  8
   Section 4.10.     Environmental Protection................................  9
   Section 4.11.     Vote Required........................................... 10
   Section 4.12.     Contracts............................................... 10
   Section 4.13.     Intellectual Property................................... 10
   Section 4.14.     Brokers................................................. 11

                                    ARTICLE 5

               REPRESENTATIONS AND WARRANTIES OF TELETRAK AND HELM

   Section 5.1.      Organization and Qualification.......................... 11
   Section 5.2.      Subsidiaries; Interests in Other Persons................ 11
   Section 5.3.      Capitalization.......................................... 12
   Section 5.4.      Authority; Non-Contravention; Statutory Approvals;
                      Compliance............................................. 12
   Section 5.5.      Reports and Financial Statements........................ 13
   Section 5.6.      Absence of Certain Changes or Events.................... 14
   Section 5.7.      Litigation.............................................. 14
   Section 5.8.      Tax Matters............................................. 14
   Section 5.9.      Employee Matters........................................ 15
   Section 5.10.     Environmental Protection................................ 16
   Section 5.11.     Contracts............................................... 16
   Section 5.12.     Intellectual Property................................... 16
   Section 5.13.     Brokers................................................. 16
   Section 5.14.     Interested Party Transactions........................... 17
   Section 5.15.     Vote Required........................................... 17


<PAGE>

                                    ARTICLE 6

                     CONDUCT OF BUSINESS PENDING THE MERGER

   Section 6.1.      Covenants of the Parties................................ 17

                                    ARTICLE 7

                              ADDITIONAL AGREEMENTS

   Section 7.1.   Access to Information...................................... 19
   Section 7.2.   Regulatory Matters......................................... 20
   Section 7.3.   Public Announcements....................................... 20
   Section 7.4.   No Solicitations........................................... 20
   Section 7.5.   Teletrak Board of Directors................................ 21
   Section 7.6.   Related Transactions....................................... 21
   Section 7.7.   Stock Split; Distribution; Name Change;
                   Filing of Information Statement........................... 21
   Section 7.8.   Expenses................................................... 22
   Section 7.9.   Best Efforts............................................... 22

                                 ARTICLE 8

                                CONDITIONS

   Section 8.1.   Conditions to Each Party's Obligation to Effect The Merger. 22
   Section 8.2.   Conditions to Obligation of Teletrak to Effect the Merger.. 23
   Section 8.3.   Conditions to Obligation of AES to Effect the Merger....... 23

                                ARTICLE 9

                     TERMINATION, AMENDMENT AND WAIVER

   Section 9.1.   Termination................................................ 24
   Section 9.2.   Effect of Termination...................................... 25
   Section 9.3.   Amendment.................................................. 25
   Section 9.4.   Waiver..................................................... 25

                                ARTICLE 10

                             INDEMNIFICATION.

   Section 10.1.  Teletrak and Helm Indemnification.......................... 25
   Section 10.2.  AES Indemnification........................................ 26
   Section 10.3.  Procedures for Indemnification............................. 26

                                ARTICLE 11

                            GENERAL PROVISIONS

   Section 11.1.  Survival................................................... 26
   Section 11.2.  Notices.................................................... 26
   Section 11.3.  Miscellaneous.............................................. 27
   Section 11.4.  Interpretation; Definitions................................ 27
   Section 11.5.  Counterparts; Effect....................................... 28
   Section 11.6.  Enforcement................................................ 28
   Section 11.7.  No Third Party Beneficiaries............................... 28
   Section 11.8.  Assignment................................................. 28

<PAGE>


      AGREEMENT AND PLAN OF MERGER (this "Agreement"), dated as of July 24, 
1998, by and between Advanced Environmental Systems, Inc., a Massachusetts 
corporation ("AES"), Teletrak Advanced Technology Systems, Inc., a Delaware 
corporation ("Teletrak"), Helm Capital Group, Inc., a Delaware corporation 
and majority shareholder of Teletrak ("Helm") and AES Acquisition Corp., a 
Massachusetts corporation and wholly-owned subsidiary of Teletrak 
("Acquisition Sub").

      WHEREAS, Teletrak and AES have determined to engage in a business 
combination;

      WHEREAS, in furtherance thereof, the respective Boards of Directors of 
AES, Teletrak and Acquisition Sub, and Teletrak acting as the sole 
shareholder of Acquisition Sub, have approved the merger of Acquisition Sub 
with and into AES (the "Merger"), upon the terms and conditions set forth in 
this Agreement;

      WHEREAS, the respective Boards of Directors of AES and Teletrak have 
each determined that the Merger and the other transactions contemplated 
hereby are in the best interests of their respective corporations and their 
respective shareholders and have adopted resolutions approving the Merger and 
the adoption of this Agreement in order to advance the long-term business 
interests of Teletrak and AES; and

      WHEREAS, it is intended that the parties hereto and their respective 
shareholders recognize no gain or loss for United States Federal income tax 
purposes as a result of the consummation of the Merger.

      NOW, THEREFORE, in consideration of the premises and the 
representations, warranties, covenants and agreements contained herein, the 
parties hereto, intending to be legally bound hereby, agree as follows:

                                    ARTICLE 1

                                   THE MERGER

      Section 1.1.  THE MERGER.  Upon the terms and subject to the conditions 
of this Agreement, at the Effective Time (as defined in Section 1.3 hereof), 
Acquisition Sub shall be merged with and into AES in accordance with the 
provisions of the Massachusetts Business Corporation Law (the "MBCL"). 
Following the Effective Time, the separate existence of Acquisition Sub shall 
cease and AES shall be the surviving corporation in the Merger (the 
"Surviving Corporation") and shall continue its corporate existence under the 
laws of the State of Massachusetts.

      Section 1.2.  EFFECTS OF THE MERGER.  At the Effective Time, (i) the 
articles of incorporation of Acquisition Sub, as in effect immediately prior 
to the Effective Time, shall be the articles of incorporation of the 
Surviving Corporation unless and until thereafter amended as provided by 
applicable law or such articles of incorporation, and (ii) the by-laws of 
Acquisition Sub, as in effect immediately prior to the Effective Time, shall 
be the by-laws of the Surviving Corporation unless and until thereafter 
amended as provided by applicable law, the articles of 


                                       
<PAGE>

incorporation of the Surviving Corporation or such by-laws. Subject to the 
foregoing, additional effects of the Merger shall be as provided by the 
applicable provisions of the MBCL.

      Section 1.3.  EFFECTIVE TIME OF THE MERGER.  Subject to the provisions 
of this Agreement, on or as soon as practicable after the Closing Date (as 
defined in Section 3.1 hereof), articles of merger (the "Articles of Merger") 
complying with the requirements of the MBCL shall be executed by AES and 
Acquisition Sub and shall be filed with the Secretary of State of the State 
of Massachusetts. The parties hereto shall make all such other filings or 
recordings in connection with the Merger when and as required under the MBCL 
and other applicable law. The Merger shall become effective at the time the 
Articles of Merger are duly filed with the Secretary of State of the State of 
Massachusetts, or at such later time or date specified in the Articles of 
Merger as Teletrak and AES shall agree (the time and date that the Merger 
becomes effective being hereinafter referred to as the "Effective Time").

      Section 1.4.  DIRECTORS.  The individuals set forth on Schedule 1.4 
hereto shall be the directors of the Surviving Corporation, until the earlier 
of their resignation or removal or until their respective successors are duly 
elected and qualified, as the case may be.

      Section 1.5.  OFFICERS.  The individuals set forth on Schedule 1.5 
hereto shall be the officers of the Surviving Corporation, until the earlier 
of their resignation or removal or until their respective successors are duly 
elected and qualified, as the case may be.

      Section 1.6.  TAX CONSEQUENCES.  It is intended by the parties hereto 
that the Merger shall constitute a reorganization within the meaning of 
Section 368(a) of the Internal Revenue Code of 1986, as amended (the "Code").

      Section 1.7.  TAKING NECESSARY ACTION; FURTHER ACTION.  Each of 
Teletrak, Acquisition Sub and AES will take all such reasonable and lawful 
action as may be necessary or appropriate in order to effectuate the Merger 
in accordance with this Agreement as promptly as possible. If, at any time 
after the Effective Time, any such further action is necessary or desirable 
to carry out the purposes of this Agreement and to vest the Surviving 
Corporation with full right, title and possession of all assets, property, 
rights, privileges, powers and franchises of AES, the officers and directors 
of AES, Teletrak and Acquisition Sub immediately prior to the Effective Time 
are hereby fully authorized in the name of their respective corporations or 
otherwise to take, and will take, all such lawful and necessary action.

                                   ARTICLE 2

                              TREATMENT OF SHARES

      Section 2.1.  EFFECT OF THE MERGER ON CAPITAL STOCK.  At the Effective 
Time, by virtue of the Merger and without any action on the part of any 
holder of the capital stock of AES or Acquisition Sub:

            (i) CONVERSION OF AES COMMON STOCK. Each issued and outstanding 
        share of Common Stock, no par value per share, of AES ("AES Common 
        Stock") shall be converted into the right to receive 375 (the 
        "Ratio") fully paid and non-assessable shares of common stock, par 
        value $.001 per share, of Teletrak ("Teletrak Common Stock").


                                       4
<PAGE>

        All such shares of AES Common Stock, when so converted, shall no 
        longer be outstanding and shall be cancelled and retired and cease to 
        exist, and each holder of a certificate formerly representing any 
        such shares shall cease to have any rights with respect thereto, 
        except the right to receive the shares of Teletrak Common Stock to be 
        issued in accordance with the Ratio upon the surrender of such 
        certificate in accordance with Section 2.2 hereof.

            (ii) TREATMENT OF ACQUISITION SUB STOCK. Each issued and 
        outstanding share of common stock, par value $.001, of Acquisition 
        Sub shall be converted into and become one fully paid and 
        non-assessable share of Common Stock, par value $.001, of the 
        Surviving Corporation.

      Section 2.2.  ISSUANCE OF NEW CERTIFICATES.

      (a) ISSUANCE PROCEDURES. As soon as practicable after the Effective 
Time, Teletrak shall deliver to each holder of record of a certificate or 
certificates ("Certificates") which immediately prior to the Effective Time 
represented outstanding shares of AES Common Stock ("Cancelled AES Shares") 
that were cancelled and became instead the right to receive shares of 
Teletrak Common Stock pursuant to Section 2.1(i) hereof ("Teletrak Shares") 
(i) a letter of transmittal (which shall specify that delivery of the 
Certificates shall be effected, and risk of loss and title to the 
Certificates shall pass, only upon actual delivery of the Certificates to the 
exchange agent appointed by the agreement of AES and Teletrak (the "Exchange 
Agent") and shall be in a form and have such other provisions as Teletrak and 
AES may reasonably specify) and (ii) instructions for use in effecting the 
surrender of Certificates representing Cancelled AES Shares in exchange for 
certificates representing Teletrak Shares. Upon surrender of a Certificate to 
the Exchange Agent for cancellation (or to such other agent or agents as may 
be appointed by the agreement of Teletrak and AES), together with a duly 
executed letter of transmittal and such other customary documents as may be 
required by the aforesaid instructions, the holder of such Certificate shall 
be entitled to receive in exchange therefor, and Teletrak shall issue 
certificates evidencing that number of Teletrak Shares which such holder has 
the right to receive in accordance with the Ratio in respect of the Cancelled 
AES Shares formerly represented by such Certificate and the Certificates so 
surrendered shall forthwith be cancelled. Until surrendered as contemplated 
by this Section 2.2, each Certificate shall be deemed at any time on and 
after the Effective Time to represent only the right to receive upon such 
surrender the number of Teletrak Shares into which the Cancelled AES Shares 
represented by such Certificate shall have been converted pursuant to Section 
2.1(i) hereof.

      (b) LOST, STOLEN OR DESTROYED CERTIFICATES. In the event any 
Certificates shall have been lost, stolen or destroyed, the Exchange Agent 
shall issue in exchange for such lost, stolen or destroyed Certificates, upon 
the making of an affidavit of that fact by the holder thereof, such Teletrak 
Shares as may be required pursuant to Section 2.1(i) hereof; PROVIDED, 
HOWEVER, that Teletrak may, in its discretion, require the owner of such 
lost, stolen or destroyed Certificates to deliver a bond as indemnity against 
any claim that may be made against Teletrak or the Exchange Agent with 
respect to the Certificates alleged to have been lost, stolen or destroyed.


                                       5
<PAGE>

                                   ARTICLE 3

                                  THE CLOSING

      Section 3.1.  CLOSING.  The closing of the Merger (the "Closing") shall 
take place at the offices of Teletrak, at 10:00 A.M., local time, on the 
second business day immediately following the date on which the last of the 
conditions set forth in ARTICLE 8 hereof is fulfilled or duly waived, or at 
such other time, date and place as AES and Teletrak shall mutually agree (the 
"Closing Date").

                                   ARTICLE 4

                     REPRESENTATIONS AND WARRANTIES OF AES

      AES represents and warrants to Teletrak and Acquisition Sub as follows:

      Section 4.1.  ORGANIZATION AND QUALIFICATION.  Except as set forth on 
Schedule 4.1 hereto, AES is a corporation duly organized, validly existing 
and in good standing under the laws of its jurisdiction of incorporation, has 
all requisite corporate power and authority, and has been duly authorized by 
all necessary approvals and orders, to own, lease and operate its assets and 
properties to the extent owned, leased and operated and to carry on its 
business as it is now being conducted. AES is duly qualified or licensed to 
do business and in good standing in each jurisdiction in which the nature of 
its business or the ownership or leasing of its assets and properties makes 
such qualification necessary, except in such jurisdictions where the failure 
to be so duly qualified or licensed could not, individually or in the 
aggregate, reasonably be expected to result in a material adverse effect on 
the business, assets, condition (financial or otherwise), or results of 
operations of AES (a "AES Material Adverse Effect") or prevent or materially 
delay the consummation of the Merger. True and complete copies of the 
articles of incorporation and by-laws of AES, as in full effect on the date 
hereof, have been furnished to Teletrak.

      Section 4.2.  SUBSIDIARIES; INTERESTS IN OTHER PERSONS.  There are no 
AES Subsidiaries or any other Persons (as defined in Section 10.5 hereof) in 
which AES has a significant equity or other ownership interest. All of the 
issued and outstanding shares of capital stock of each AES Subsidiary are 
validly issued, fully paid, non-assessable and free of preemptive rights, and 
are owned by AES free and clear of any liens, claims, encumbrances, security 
interests, equities, charges (collectively, "Liens") or limitations on AES's 
voting rights, voting trusts or proxies.

      Section 4.3.  CAPITALIZATION.  The authorized capital stock of AES 
consists solely of 200,000 shares of common stock, no par value. As of the 
close of business on December 31, 1997, there were issued and outstanding 
10,000 shares of AES Common Stock. There are no outstanding subscriptions, 
options, calls, contracts or other commitments, understandings, restrictions, 
arrangements, rights or warrants, including any right of conversion or 
exchange under any outstanding security, instrument or other agreement, 
obligating AES to issue, deliver or sell, or cause to be issued, delivered or 
sold, additional shares of its capital stock or obligating it to grant, 
extend or enter into any such agreement or commitment (collectively, "Equity 
Commitments"). All of the issued and outstanding shares of capital stock of 
AES are, and will be, duly authorized, validly issued, fully paid, 
non-assessable and free of preemptive


                                       6
<PAGE>

rights. There are no bonds, debentures, notes or other indebtedness of AES 
having the right to vote (or convertible into, or exchangeable for, 
securities having the right to vote) on any matters on which shareholders of 
AES may vote. Except as set forth above, since December 31, 1997, no shares 
of capital stock or other voting securities of AES were issued, reserved for 
issuance, issuable or outstanding.

      Section 4.4. AUTHORITY; NON-CONTRAVENTION; STATUTORY APPROVALS; COMPLIANCE

      (a) AUTHORITY. AES has all requisite power and authority to execute and 
deliver this Agreement, and, subject to the AES Shareholders' Approval (as 
defined in Section 4.11 hereof) and the AES Statutory Approvals (as defined 
in Section 4.4(c) hereof), to consummate the transactions contemplated 
hereby. The execution and delivery of this Agreement and the consummation by 
AES of the transactions contemplated hereby have been duly authorized by all 
necessary corporate action on the part of AES, subject only to obtaining the 
AES Shareholders' Approval. This Agreement has been duly and validly executed 
and delivered by AES and, assuming the due authorization, execution and 
delivery hereof by the other signatories hereto, constitutes the valid and 
binding obligation of AES enforceable against it in accordance with its 
terms, except as such enforceability may be limited by (i) bankruptcy laws 
and other similar laws affecting creditors' rights generally and (ii) general 
principles of equity, regardless of whether asserted in a proceeding in 
equity or at law. The Board of Directors of AES has determined that it is 
advisable and in the best interest of AES's shareholders and AES for AES to 
effect the Merger upon the terms and conditions of this Agreement and has 
unanimously approved and recommended that AES's shareholders approve and 
adopt this Agreement and the Merger.

      (b) NON-CONTRAVENTION. The execution and delivery of this Agreement by 
AES does not, and the consummation of the transactions contemplated hereby 
will not violate, conflict with, or result in a breach of any provision of, 
or constitute a default (with or without notice or lapse of time or both) 
under, or result in the termination or modification of, or accelerate the 
performance required by, or result in a right of termination, cancellation, 
or acceleration of any obligation or the loss of a material benefit under, or 
result in the creation of any Lien upon any of the properties or assets of 
AES or any of the AES Subsidiaries (any such violation, conflict, breach, 
default, right of termination, modification, cancellation or acceleration, 
loss or creation, a "Violation" with respect to AES, and such term when used 
in ARTICLE 5 hereof having a correlative meaning with respect to Teletrak) 
pursuant to or under (i) except as provided in Section 1.2 hereof, the 
articles of incorporation, by-laws or similar constituent documents of AES, 
(ii) subject to obtaining the AES Statutory Approvals and the receipt of the 
AES Shareholders' Approval, any statute, law, ordinance, rule, regulation, 
judgment, decree, order, injunction, writ, permit or license (collectively, 
"Legal Requirements") of any Governmental Authority (as defined in Section 
4.4(c) hereof) applicable to AES or (iii) subject to obtaining any necessary 
third-party consents (the "AES Required Consents"), any note, bond, mortgage, 
indenture, deed of trust, license, franchise, contract, lease or other 
instrument or agreement (collectively, "Contracts") to which AES is a party 
or by which it or any of its properties or assets may be bound or affected, 
except for Violations that could not, individually or in the aggregate, 
reasonably be expected to result in a AES Material Adverse Effect or prevent 
or materially delay the consummation of the Merger.


                                       7
<PAGE>

      (c) STATUTORY APPROVALS. Other than for the filing and recordation of 
appropriate merger or other documents as required by the MBCL, no 
declaration, filing or registration with, or notice to or authorization, 
consent or approval (collectively, "Governmental Filings and Approvals") of 
any court, Federal, state, local, foreign or transnational governmental or 
regulatory agency, body (including a stock exchange or other self-regulatory 
body) or authority (each, a "Governmental Authority") is necessary for the 
execution and delivery of this Agreement by AES or the consummation by AES of 
the transactions contemplated hereby, except where the failure to make or 
obtain such Governmental Filings and Approvals could not, individually or in 
the aggregate, reasonably be expected to result in a AES Material Adverse 
Effect or prevent or materially delay the consummation of the Merger (the 
"AES Statutory Approvals").

      (d) COMPLIANCE. AES is in compliance with all Legal Requirements of any 
Governmental Authority applicable to its business and operations, except for 
instances of noncompliance that could not, individually or in the aggregate, 
reasonably be expected to result in a AES Material Adverse Effect or prevent 
or materially delay the consummation of the Merger. AES has in effect all 
permits, licenses, franchises and other similar governmental authorizations, 
consents and approvals (collectively, "Permits") necessary to conduct its 
business as presently conducted, except for the failure to have such Permits 
that could not, individually or in the aggregate, reasonably be expected to 
result in a AES Material Adverse Effect. There has occurred no default under 
any Permit, except for defaults under Permits that could not, individually or 
in the aggregate, reasonably be expected to result in a AES Material Adverse 
Effect. No investigation or review by any Governmental Authority with respect 
to AES is pending or, to the best knowledge of AES, threatened, nor has any 
Governmental Authority indicated an intention to conduct any investigation or 
review, other than, in each case, those the outcome of which could not, 
individually or in the aggregate, reasonably be expected to result in a AES 
Material Adverse Effect or prevent or materially delay the consummation of 
the Merger.

      Section 4.5.  FINANCIAL STATEMENTS.  The audited consolidated financial 
statements for the fiscal years ended December 31, 1996 and 1997of AES have 
been prepared in accordance with United States generally accepted accounting 
principles ("GAAP") then in effect (except as may be indicated therein or in 
the notes thereto) applied on a consistent basis and fairly present in all 
material respects the financial position of AES as of the date thereofs and 
the results of its operations, cash flows and shareholders' equity for the 
periods then ended. Except for liabilities and obligations incurred in the 
ordinary course of business consistent with past practice since the date of 
the most recent balance sheet furnished to Teletrak and that could not, 
individually or in the aggregate, reasonably be expected to result in a AES 
Material Adverse Effect, AES does not have any liabilities or obligations of 
any nature (whether accrued, absolute, contingent or otherwise) required by 
GAAP to be set forth on a balance sheet of AES or in the notes thereto. The 
unauditied June 30, 1998 financial statements fairly present in all material 
respects the financial position of AES as and the date thereof and the 
results of its operations for the period then ended.


                                       8
<PAGE>

      Section 4.6.  ABSENCE OF CERTAIN CHANGES OR EVENTS.  Since December 31, 
1996, AES has conducted its business only in the ordinary course of business 
consistent with past practice and there has not been, insofar as reasonably 
can be foreseen, (i) a AES Material Adverse Effect; (ii) any damage to, 
destruction or loss of any asset of AES (whether or not covered by insurance) 
that could reasonably be expected to result in a AES Material Adverse Effect; 
(iii) any material change by AES in its accounting methods, principles or 
practices; (iv) any revaluation by AES of any of its assets having a AES 
Material Adverse Effect; (v) any other action or event that would have 
required the consent of Teletrak pursuant to ARTICLE 6 hereof had such action 
or event occurred after the date of this Agreement and that could, 
individually or in the aggregate, reasonably be expected to have a AES 
Material Adverse Effect; (vi) any sale of a material amount of property or 
capital stock of AES, except in the ordinary course of business; (vii) any 
declaration, setting aside or payment of any dividend or other distribution 
(whether in cash, stock or property) with respect to any of AES's capital 
stock; (viii) any repurchase, redemption, split, combination or 
reclassification of any of AES's capital stock or any issuance or the 
authorization of any issuance of any other securities in respect of, in lieu 
of or in substitution for shares of its capital stock; or (ix) (A) any 
granting by AES to any officer of AES of any increase in compensation, except 
in the ordinary course of business consistent with prior practice or as was 
required under employment agreements in effect as of the date of the most 
recent audited financial statements, (B) any granting by AES to any officer 
of any increase in severance or termination pay, except as was required under 
any employment, severance or termination agreements in effect as of the date 
of the most recent audited financial statements or (C) any entry by AES into 
any employment, severance or termination agreement with any officer.

      Section 4.7.  LITIGATION.  There is no claim, suit, action or 
proceeding (collectively, "Legal Proceedings") pending or, to the best 
knowledge of AES, threatened against, relating to or affecting AES, except 
those that could not, individually or in the aggregate, reasonably be 
expected to result in a AES Material Adverse Effect or prevent or materially 
delay the consummation of the Merger, nor is there any judgment, decree, 
injunction, rule or order of any Governmental Authority or arbitrator 
outstanding against, relating to or affecting AES having, or which could 
reasonably be expected to have, any such effects.

      Section 4.8.  TAX MATTERS

      (a) "Taxes", as used in this Agreement, means any United States 
Federal, state, county, local, transnational or foreign taxes, charges, fees, 
levies, or other assessments, including all net income, gross income, sales 
and use, ad valorem, transfer, gains, profits, excise, franchise, real and 
personal property, gross receipt, capital stock, production, business and 
occupation, disability, employment, payroll, license, estimated, stamp, 
custom duties, severance or withholding taxes or charges imposed by any 
Governmental Authority and includes any interest and penalties (civil or 
criminal) on or additions to any such taxes. "Tax Return", as used in this 
Agreement, means report, return or other information required to be supplied 
to a Governmental Authority with respect to Taxes including, where permitted 
or required, combined or consolidated returns for any group of Persons that 
includes AES, or Teletrak or any of its Subsidiaries, as the case may be.

      (b) (i) AES has filed (or there has been filed on its behalf) all 
material Tax Returns required to be filed by it under applicable law and all 
such Tax Returns were and are in


                                       9
<PAGE>

all material respects complete and correct and were filed on a timely basis, 
(ii) AES has, within the time and in the manner prescribed by applicable law, 
paid all Taxes that were due and payable except for those contested in good 
faith and for which adequate reserves have been taken, and except where any 
failure to make such payment would not be reasonably likely to have a AES 
Material Adverse Effect, (iii) AES has established on its books and records 
reserves adequate to pay all unpaid Taxes in accordance with GAAP, (iv) AES 
has withheld and paid all Taxes required to have been withheld and paid in 
connection with amounts paid or owing to any employee, independent 
contractor, customer, creditor or other Person, except where any failure to 
make such withholding would not be reasonably likely to have a AES Material 
Adverse Effect, (v) AES has not executed any outstanding waivers, extensions 
or comparable consents regarding the application of the statute of 
limitations with respect to any Taxes or Tax Returns, (vi) no audits or other 
administrative proceedings or court proceedings are presently pending with 
regard to any Taxes or Tax Returns of AES, and there is (A) no deficiency for 
any Taxes proposed, asserted or assessed against AES that has not been 
resolved and paid in full and (B) no dispute or claim concerning any Tax 
liability of AES either (x) claimed or raised in writing by any Governmental 
Authority or (y) as to which any officer, director or employee of AES who is 
responsible for Tax matters has knowledge and (vii) AES has no liability for 
Taxes of any Person other than AES, as a transferee or successor, by 
contract, or otherwise.

      Section 4.9.  EMPLOYEE MATTERS.

      (a) EMPLOYEE BENEFIT PLANS. There are no material employee benefit, 
welfare or compensation plans or arrangements (written or oral) covering 
current or former directors, officers of employees of AES ("AES Employee 
Plans"). True, correct and complete copies of all written AES Employee Plans 
have been provided to Teletrak.

      (b) PAYMENTS RESULTING FROM MERGER. The consummation or announcement of 
any transaction contemplated by this Agreement will not (either alone or upon 
the occurrence of any additional or further acts or events) result in any 
payment (whether of severance pay, "change of control payment" (including any 
gross-up payments) or otherwise) becoming due from AES or any successor 
thereof to any officer, employee, former employee or director thereof.

      (c) LABOR AGREEMENTS. AES is not a party to any collective bargaining 
agreement or other labor agreement with any union or labor organization. To 
the best knowledge of AES, there is no current union representation question 
involving employees of AES, nor does AES know of any activity or proceeding 
of any labor organization (or representative thereof) or employee group to 
organize any such employees. (i) There is no unfair labor practice, 
employment discrimination or other material complaint against AES pending, or 
to the best knowledge of AES, threatened, (ii) there is no strike or lockout 
or material dispute, slowdown or work stoppage pending, or to the best 
knowledge of AES, threatened, against or involving AES, and (iii) there is no 
Legal Proceeding pending or, to the best knowledge of AES, threatened, in 
respect of which any director, officer, employee or agent of AES is or may be 
entitled to claim indemnification from AES pursuant to its articles of 
incorporation or by-laws or other similar constituent documents or as 
provided in any indemnification agreements.


                                       10
<PAGE>


      Section 4.10.  ENVIRONMENTAL PROTECTION.

      (a) COMPLIANCE; PERMITS. AES is in compliance with all applicable 
Environmental Laws (as defined in Section 4.10(e)(ii) hereof), except for 
noncompliance which could not, individually or in the aggregate, reasonably 
be expected to result in a AES Material Adverse Effect. AES has obtained or 
has applied for all material environmental, health and safety Permits 
(collectively, the "Environmental Permits") necessary for the conduct of 
their operations, and all such Environmental Permits are in good standing or, 
where applicable, a renewal application has been timely filed and is pending 
agency or other governmental approval, and AES is in compliance with all 
terms and conditions of the Environmental Permits, except for noncompliance 
which could not, individually or in the aggregate, reasonably be expected to 
result in a AES Material Adverse Effect.

      (b) ENVIRONMENTAL CLAIMS. To the best knowledge of AES, there is no 
Environmental Claim (as defined in Section 4.10(e)(i) hereof) pending (i) 
against AES, (ii) against any Person whose liability for any Environmental 
Claim has been retained or assumed by AES either contractually or by 
operation of law, or (iii) against any real or personal property or 
operations which AES owns, leases or manages, in whole or in part, except for 
any such Claims which could not, individually or in the aggregate, reasonably 
be expected to result in a AES Material Adverse Effect.

      (c) RELEASES. There has been no Release (as defined in Section 
4.10(e)(iv) hereof) of any Hazardous Material (as defined in Section 
4.10(e)(iii) hereof) that could be reasonably likely to form the basis of any 
Environmental Claim against AES, or against any Person whose liability for 
any Environmental Claim has been retained or assumed by AES either 
contractually or by operation of law, except for any Releases which could 
not, individually or in the aggregate, reasonably be expected to result in a 
AES Material Adverse Effect.

      (d) PREDECESSORS. AES has no knowledge, with respect to any predecessor 
of AES, of any Environmental Claim pending or threatened, or of any Release 
of Hazardous Materials that could be reasonably likely to form the basis of 
any Environmental Claim, except for those which could not, individually or in 
the aggregate, reasonably be expected to result in a AES Material Adverse 
Effect.

      (e)  As used in this Agreement:

           (i) "Environmental Claim" means any and all administrative, 
      regulatory or judicial actions, suits, demands, demand letters, 
      directives, claims, Liens, investigations, proceedings or notices of 
      noncompliance or violation (written or oral) by any Person (or any 
      Governmental Authority) alleging potential liability (including 
      liability for enforcement, investigatory costs, cleanup costs, 
      governmental response costs, removal costs, remedial costs, natural 
      resources damages, property damages, personal injuries or penalties) 
      arising out of, based on or resulting from (A) the presence, or Release 
      or threatened Release into the environment, of any Hazardous Materials 
      at any location, whether or not owned, operated, leased or managed by 
      AES (for purposes of this Section 4.10), or by Teletrak or any of its 
      subsidiaries (for purposes of Section 5.10 hereof); or (B) any and all 
      claims by any third party seeking damages, contribution, 
      indemnification, cost recovery, compensation or injunctive relief 
      resulting from the presence or Release of


                                       11
<PAGE>

      any Hazardous Materials.

           (ii) "Environmental Laws" means all Federal, state, transnational, 
      foreign, or local Legal Requirements relating to pollution, the 
      environment (including, without limitation, ambient air, surface water, 
      groundwater, land surface or subsurface strata) or protection of human 
      health as it relates to the environment including, without limitation, 
      Legal Requirements relating to Releases or threatened Releases of 
      Hazardous Materials, or otherwise relating to the manufacture, 
      processing, distribution, use, treatment, storage, disposal, transport 
      or handling of Hazardous Materials.

           (iii) "Hazardous Materials" means any pollutant, contaminant, 
      hazardous, radioactive or toxic substance, material, constituent or 
      waste, or any other waste, substance, chemical or material regulated 
      under any Environmental Law, including (1) petroleum, crude oil and any 
      fractions thereof, (2) natural gas, synthetic gas and any mixtures 
      thereof, (3) asbestos and/or asbestos-containing material, (4) radon 
      and (5) polychlorinated biphenyls ("PCBs"), or materials or fluids 
      containing PCBs.

           (iv) "Release" means any release, spill, emission, leaking, 
      injection, deposit, disposal, discharge, dispersal, leaching or 
      migration into the atmosphere, soil, surface water, groundwater or 
      property.

      Section 4.11.  VOTE REQUIRED.  The approval of this Agreement by the 
holders of two-thirds (2/3) of the outstanding shares of AES Common Stock 
(the "AES Shareholders' Approval") is the only vote of the holders of any of 
the capital stock of AES required to approve this Agreement, the Merger and 
the other transactions contemplated hereby.

      Section 4.12.  CONTRACTS.  Except as set forth on Schedule 4.12 hereto 
and copies of which were delivered to Teletrak, there are no Contracts that 
are material to the business, financial condition or results of operations of 
AES. AES is not in violation of or default under (nor does there exist any 
condition which upon the passage of time or the giving of notice or both 
would cause such a violation of or default under) any Contract to which it is 
a party or by which it or any of its properties or assets is bound, except 
for violations or defaults that could not, individually or in the aggregate, 
reasonably be expected to result in a AES Material Adverse Effect.

      Section 4.13.  INTELLECTUAL PROPERTY. AES owns or is validly licensed 
or otherwise has the right to use all patents, patent rights, trademarks, 
trademark rights, trade names, trade name rights, service marks, service mark 
rights, copyrights and other intellectual property rights and computer 
programs that are material to the conduct of the business of AES as now 
operated (collectively, "AES Intellectual Property Rights"). (i) No claims 
are pending or, to the best knowledge of AES, threatened that AES is 
infringing or otherwise adversely affecting the material rights of any Person 
and (ii) to the best knowledge of AES, no Person is infringing the rights of 
AES with respect to any material item of AES Intellectual Property Rights.

      Section 4.14.  BROKERS.  No broker, investment banker, financial 
advisor or other Person is entitled to any broker's, finder's, financial 
advisor's or other similar fee or commission in connection with the 
transactions contemplated by this Agreement.


                                       12
<PAGE>

                                   ARTICLE 5

               REPRESENTATIONS AND WARRANTIES OF TELETRAK AND HELM

      Teletrak and Helm, jointly and severally, represent and warrant to AES 
as follows:

      Section 5.1.  ORGANIZATION AND QUALIFICATION. Except as set forth on 
Schedule 5.1 hereto, each of Teletrak, Helm and each of the Teletrak 
Subsidiaries is a corporation duly organized, validly existing and in good 
standing under the laws of its jurisdiction of incorporation or organization, 
has all requisite corporate power and authority, and has been duly authorized 
by all necessary approvals and orders, to own, lease and operate its assets 
and properties to the extent owned, leased and operated and to carry on its 
business as it is now being conducted. Each of Teletrak, Helm and the 
Teletrak Subsidiaries is duly qualified or licensed to do business and in 
good standing in each jurisdiction in which the nature of its business or the 
ownership or leasing of its assets and properties makes such qualification 
necessary, except in such jurisdictions where the failure to be so duly 
qualified or licensed could not, individually or in the aggregate, reasonably 
be expected to result in a material adverse effect on the business, assets, 
condition (financial or otherwise), or results of operations of Teletrak (a 
"Teletrak Material Adverse Effect") or of Helm (a "Helm Material Adverse 
Effect") or prevent or materially delay the consummation of the Merger. True 
and complete copies of the certificate of incorporation and by-laws of 
Teletrak, as in full effect on the date hereof, have been furnished to AES.

      Section 5.2.  SUBSIDIARIES; INTERESTS IN OTHER PERSONS. Schedule 5.2 
hereto sets forth a true and complete list of all Teletrak Subsidiaries and 
other Persons in which Teletrak has a significant equity or other ownership 
interest, including the name, state or country of organization of each such 
Subsidiary or other Person and Teletrak's interest therein. Except as set 
forth on Schedule 5.2, all of the issued and outstanding shares of capital 
stock of each Teletrak Subsidiary are validly issued, fully paid, 
non-assessable and free of preemptive rights, and are owned by Teletrak free 
and clear of any Liens or limitations on Teletrak's voting rights, voting 
trusts or proxies and there are no Equity Commitments in respect of such 
Subsidiaries' capital stock. With respect to any Person in which Teletrak has 
an interest that is not a Teletrak Subsidiary (i) except as set forth on 
Schedule 5.2, neither Teletrak nor any Teletrak Subsidiary is liable, 
directly or indirectly, for any obligations or liabilities of any such 
Person; and (ii) neither Teletrak nor any Teletrak Subsidiary is obligated to 
redeem or otherwise acquire any shares of such Person or to provide funds to 
or make any investments in such Person in the form of loans, capital 
contributions or guarantees.

      Section 5.3.  CAPITALIZATION.  As of October 31, 1997, the authorized 
capital stock of Teletrak consists solely of 80,000,000 shares of common 
stock, par value $.01 per share, and 20,000,000 shares of preferred stock, 
par value $.01 per share (the "Teletrak Preferred Stock"). As of the close of 
business on December 31, 1997, (i) there were issued and outstanding 
30,229,268 shares of Teletrak Common Stock and no shares of Teletrak 
Preferred Stock, and (ii) no shares of Teletrak Common Stock were held in 
treasury or by subsidiaries. Except as set forth on Schedule 5.3 hereto, 
there are no outstanding Equity Commitments in respect of any of the capital 
stock or other voting securities of Teletrak. All of the issued and 
outstanding shares of capital stock of Teletrak are, and any shares of 
Teletrak Common Stock issued pursuant to Teletrak Equity Commitments, will 
be, duly authorized, validly issued, fully paid, non-assessable 


                                       13
<PAGE>

and free of preemptive rights. There are no outstanding stock appreciation 
rights of Teletrak or other rights of Teletrak redeemable for cash. Except as 
set forth on Schedule 5.3, there are no bonds, debentures, notes or other 
indebtedness of Teletrak having the right to vote (or convertible into, or 
exchangeable for, securities having the right to vote) on any matters on 
which shareholders of Teletrak may vote. Except as set forth above, since 
December 31, 1997, no shares of capital stock or other voting securities of 
Teletrak were issued, reserved for issuance, issuable or outstanding.

      Section 5.4. AUTHORITY; NON-CONTRAVENTION; STATUTORY APPROVALS; COMPLIANCE

      (a) AUTHORITY. Each of Teletrak, Helm and Acquisition Sub has all 
requisite power and authority to execute and deliver this Agreement, and, 
subject to the Teletrak Statutory Approvals (as defined in Section 5.4(c) 
hereof), to consummate the transactions contemplated hereby. The execution 
and delivery of this Agreement and the consummation by Teletrak, Helm and 
Acquisition Sub of the transactions contemplated hereby have been duly 
authorized by all necessary corporate action on the part of Teletrak, Helm 
and Acquisition Sub, subject to obtaining the Teletrak Shareholders' Approval 
with respect to the transactions contemplated by Section 7.7 hereof. This 
Agreement has been duly and validly executed and delivered by Teletrak, Helm 
and Acquisition Sub, assuming the due authorization, execution and delivery 
hereof by the other signatories hereto, constitutes the valid and binding 
obligation of Teletrak, Helm and Acquisition Sub enforceable against each of 
them in accordance with its terms, except as such enforceability may be 
limited by (i) bankruptcy laws and other similar laws affecting creditors' 
rights generally and (ii) general principles of equity, regardless of whether 
asserted in a proceeding in equity or at law. The Boards of Directors of 
Teletrak, Helm and Acquisition Sub have determined that it is advisable and 
in the best interest of Teletrak's and Acquisition Sub's shareholders and 
Teletrak and Acquisition Sub for Teletrak and Acquisition Sub to effect the 
Merger upon the terms and conditions of this Agreement.

      (b) NON-CONTRAVENTION. The execution and delivery of this Agreement by 
Teletrak, Helm and Acquisition Sub does not, and the consummation of the 
transactions contemplated hereby will not result in a Violation pursuant to 
or default under (i) the certificate of incorporation, by-laws or similar 
constituent documents of Teletrak, Helm or any of the Teletrak Subsidiaries, 
(ii) subject to obtaining the Teletrak Statutory Approvals, any Legal 
Requirement of any Governmental Authority applicable to Teletrak, Helm or any 
of the Teletrak Subsidiaries or (iii) subject to obtaining any necessary 
third-party consents (the "Teletrak Required Consents"), any Contract to 
which Teletrak, Helm or any of the Teletrak Subsidiaries is a party or by 
which it or any of its properties or assets may be bound or affected, except 
for Violations that could not, individually or in the aggregate, reasonably 
be expected to result in a


                                       14
<PAGE>

Teletrak Material Adverse Effect, a Helm Material Adverse Effect or prevent 
or materially delay the consummation of the Merger.

      (c) STATUTORY APPROVALS. Other than for applicable requirements, if 
any, of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), 
Blue Sky Laws, and the filing and recordation of appropriate merger or other 
documents as required by the MBCL, no Governmental Filings and Approvals of 
any Governmental Authority is necessary for the execution and delivery of 
this Agreement by Teletrak or Helm or the consummation by Teletrak or Helm of 
the transactions contemplated hereby, except where the failure to make or 
obtain such Governmental Filings and Approvals could not, individually or in 
the aggregate, reasonably be expected to result in a Teletrak Material 
Adverse Effect, a Helm Material Adverse Effect or prevent or materially delay 
the consummation of the Merger (the "Teletrak Statutory Approvals").

      (d) COMPLIANCE. Teletrak and the Teletrak Subsidiaries are in 
compliance with all Legal Requirements of any Governmental Authority 
applicable to its business and operations, except for instances of 
noncompliance that could not, individually or in the aggregate, reasonably be 
expected to result in a Teletrak Material Adverse Effect or prevent or 
materially delay the consummation of the Merger. Teletrak and the Teletrak 
Subsidiaries have in effect all Permits necessary to conduct their businesses 
as presently conducted, except for the failure to have such Permits that 
could not, individually or in the aggregate, reasonably be expected to result 
in a Teletrak Material Adverse Effect. There has occurred no default under 
any Permit, except for defaults under Permits that could not, individually or 
in the aggregate, reasonably be expected to result in a Teletrak Material 
Adverse Effect. No investigation or review by any Governmental Authority with 
respect to Teletrak is pending or, to the best knowledge of Teletrak, 
threatened, nor has any Governmental Authority indicated an intention to 
conduct any investigation or review, other than, in each case, those the 
outcome of which could not, individually or in the aggregate, reasonably be 
expected to result in a Teletrak Material Adverse Effect or prevent or 
materially delay the consummation of the Merger.

      Section 5.5.  REPORTS AND FINANCIAL STATEMENTS.  All filings required 
to be made, or otherwise made, by Teletrak since January 1, 1995 through the 
date hereof under the Securities Act of 1933, as amended (the "Securities 
Act") and the Exchange Act, have been filed with the Securities and Exchange 
Commission (the "SEC"), including all forms, statements, reports and other 
documents (as such documents may have since the time of their filing been 
amended or supplemented through the date hereof, the "Teletrak SEC Reports"). 
As of their respective filing dates, the Teletrak SEC Reports (i) complied in 
all material respects with the Securities Act or the Exchange Act, as the 
case may be, and (ii) did not contain any untrue statement of a material fact 
or omit to state a material fact required to be stated therein or necessary 
to make the statements therein, in light of the circumstances under which 
they were made, not misleading. To the extent so required by applicable law, 
such Teletrak SEC Reports have been subsequently updated and/or amended. 
Teletrak "meets the requirements for use of Form S-3" as such phrase is used 
in Instruction C of Form S-3 under the Securities Act and qualifies as an 
"inactive entity" as defined in Rule 3-11 of SEC Regulation S-X. The 
consolidated financial statements and interim financial statements of 
Teletrak included in the Teletrak SEC Reports complied as to form in all 
material respects with applicable accounting rules and regulations of the SEC 
in respect thereto then in effect, have been prepared in accordance with GAAP 
then in effect (except as may be indicated therein or in the notes thereto) 


                                       15
<PAGE>

applied on a consistent basis and fairly present in all material respects the 
consolidated financial positions of Teletrak and the Teletrak Subsidiaries as 
of the dates thereof and the consolidated results of its operations, cash 
flows and shareholders' equity for the periods then ended, subject, in the 
case of the interim financial statements, to normal, recurring audit 
adjustments which were not material in amount. Teletrak does not have any 
liabilities or obligations of any nature (whether accrued, absolute, 
contingent or otherwise).

      Section 5.6.  ABSENCE OF CERTAIN CHANGES OR EVENTS.  Except as 
expressly contemplated by this Agreement and except as set forth on Schedule 
5.6 hereto, since December 31, 1996, Teletrak and each of the Teletrak 
Subsidiaries have conducted their business only in the ordinary course of 
business consistent with past practice and there has not been, insofar as 
reasonably can be foreseen, (i) a Teletrak Material Adverse Effect; (ii) any 
material change by Teletrak in its accounting methods, principles or 
practices; (iii) any other action or event that would have required the 
consent of AES pursuant to ARTICLE 6 hereof had such action or event occurred 
after the date of this Agreement and that could, individually or in the 
aggregate, reasonably be expected to result in a Teletrak Material Adverse 
Effect; (iv) any sale of capital stock of Teletrak or any of the Teletrak 
Subsidiaries; (v) any declaration, setting aside or payment of any dividend 
or other distribution (whether in cash, stock or property) with respect to 
any of Teletrak's capital stock; (vi) any repurchase, redemption, split, 
combination or reclassification of any of Teletrak's capital stock or any 
issuance or the authorization of any issuance of any other securities in 
respect of, in lieu of or in substitution for shares of its capital stock; or 
(vii) (A) any granting by Teletrak to any officer of Teletrak of any increase 
in compensation, except in the ordinary course of business consistent with 
prior practice or as was required under employment agreements in effect as of 
the date of the most recent financial statements included in the Teletrak SEC 
Reports, (B) any granting by Teletrak to any officer of any increase in 
severance or termination pay, except as was required under any employment, 
severance or termination agreements in effect as of the date of the most 
recent financial statements included in the Teletrak SEC Reports or (C) any 
entry by Teletrak into any employment, severance or termination agreement 
with any officer.

      Section 5.7.  LITIGATION.  Except as set forth on Schedule 5.7 hereto, 
there is no Legal Proceeding pending or, to the best knowledge of Teletrak, 
threatened against, relating to or affecting Teletrak or any of the Teletrak 
Subsidiaries, nor is there any judgment, decree, injunction, rule or order of 
any Governmental Authority or arbitrator outstanding against, relating to or 
affecting Teletrak or any of the Teletrak Subsidiaries.

      Section 5.8.  TAX MATTERS.  Except as set forth on Schedule 5.8 hereto: 
(i) Teletrak and each of the Teletrak Subsidiaries have filed (or there has 
been filed on its behalf) all material Tax Returns required to be filed by 
each of them under applicable law and all such Tax Returns were and are in 
all material respects complete and correct and were filed on a timely basis, 
(ii) Teletrak and each of the Teletrak Subsidiaries have, within the time and 
in the manner prescribed by applicable law, paid all Taxes that were due and 
payable except for those contested in good faith and for which adequate 
reserves have been taken, and except where any failure to make such payment 
would not be reasonably likely to have a Teletrak Material Adverse Effect, 
(iii) Teletrak and the Teletrak Subsidiaries have established on their books 
and records reserves adequate to pay all unpaid Taxes in accordance with 
GAAP, (iv) Teletrak and each of the Teletrak Subsidiaries have withheld and 
paid all Taxes required to have been withheld and paid in connection with 
amounts paid or owing to any employee, independent contractor, customer, 


                                       16
<PAGE>

creditor or other Person, except where any failure to make such withholding 
would not be reasonably likely to have a Teletrak Material Adverse Effect, 
(v) neither Teletrak nor any of the Teletrak Subsidiaries has executed any 
outstanding waivers, extensions or comparable consents regarding the 
application of the statute of limitations with respect to any Taxes or Tax 
Returns, (vi) no audits or other administrative proceedings or court 
proceedings are presently pending with regard to any Taxes or Tax Returns of 
Teletrak or any of the Teletrak Subsidiaries, and there is (A) no deficiency 
for any Taxes proposed, asserted or assessed against Teletrak or any of the 
Teletrak Subsidiaries that has not been resolved and paid in full and (B) no 
dispute or claim concerning any Tax liability of Teletrak or any Subsidiary 
either (x) claimed or raised in writing by any Governmental Authority or (y) 
as to which any officer, director or employee of Teletrak or any Subsidiary 
who is responsible for Tax matters has knowledge, and (vii) neither Teletrak 
nor any of the Teletrak Subsidiaries has any liability for Taxes of any 
Person other than Teletrak and the Teletrak Subsidiaries as a transferee or 
successor, by contract, or otherwise.

      Section 5.9.  EMPLOYEE MATTERS

      (a) EMPLOYEE BENEFIT PLANS.  There are no material employee benefit, 
welfare or compensation plans or arrangements (written or oral) covering 
former or current officers, directors or employees of Teletrak or its 
Subsidiaries.

      (b) PAYMENTS RESULTING FROM MERGER. (i) Other than as expressly 
contemplated by this Agreement, the consummation or announcement of any 
transaction contemplated by this Agreement will not (either alone or upon the 
occurrence of any additional or further acts or events) result in any payment 
(whether of severance pay, "change of control payment" (including any 
gross-up payments) or otherwise) becoming due from Teletrak or any of the 
Teletrak Subsidiaries or any successor thereto to any officer, employee, 
former employee or director thereof.

      (c) LABOR AGREEMENTS. Neither Teletrak nor any of the Teletrak 
Subsidiaries is a party to any collective bargaining agreement or other labor 
agreement with any union or labor organization. To the best knowledge of 
Teletrak, there is no current union representation question involving 
employees of Teletrak or any of the Teletrak Subsidiaries, nor does Teletrak 
know of any activity or proceeding of any labor organization (or 
representative thereof) or employee group to organize any such employees. 
There is no unfair labor practice, employment discrimination or other 
material complaint against Teletrak or any of the Teletrak Subsidiaries 
pending, or to the best knowledge of Teletrak, threatened and there is no 
Legal Proceeding pending or, to the best knowledge of Teletrak, threatened, 
in respect of which any director, officer, employee or agent of Teletrak or 
any of the Teletrak Subsidiaries is or may be entitled to claim 
indemnification from Teletrak or such Subsidiary pursuant to their respective 
certificates of incorporation or by-laws or other similar constituent 
documents or as provided in any indemnification agreements.

      Section 5.10. ENVIRONMENTAL PROTECTION

      (a) COMPLIANCE; PERMITS.  Teletrak and each of the Teletrak 
Subsidiaries is in compliance with all applicable Environmental Laws.

      (b) ENVIRONMENTAL CLAIMS. To the best knowledge of Teletrak,
there is no


                                       17
<PAGE>

Environmental Claim pending (i) against Teletrak or any of the Teletrak 
Subsidiaries, (ii) against any Person whose liability for any Environmental 
Claim has been retained or assumed by Teletrak or any of the Teletrak 
Subsidiaries either contractually or by operation of law, or (iii) against 
any real or personal property or operations which Teletrak or any of the 
Teletrak Subsidiaries owns, leases or manages, in whole or in part.

      (c) RELEASES.  There has been no Releases of any Hazardous Material that
could be reasonably likely to form the basis of any Environmental Claim 
against Teletrak or any of the Teletrak Subsidiaries, or against any Person 
whose liability for any Environmental Claim has been retained or assumed by 
Teletrak or any of the Teletrak Subsidiaries either contractually or by 
operation of law.

      (d) PREDECESSORS.  Teletrak has no knowledge, with respect to any 
predecessor of Teletrak or any of the Teletrak Subsidiaries, of any 
Environmental Claim.

      Section 5.11.  CONTRACTS.  There are no Contracts that are material to 
the business, financial condition or results of operations of Teletrak. 
Neither Teletrak nor any of the Teletrak Subsidiaries is in violation of or 
in default under (nor does there exist any condition which upon the passage 
of time or the giving of notice or both would cause such a violation of or 
default under) any Contract to which it is a party or by which it or any of 
its properties or assets is bound.

      Section 5.12.  INTELLECTUAL PROPERTY.  Teletrak or a Teletrak 
Subsidiary owns or is validly licensed or otherwise has the right to use all 
patents, patent rights, trademarks, trademark rights, trade names, trade name 
rights, service marks, service mark rights, copyrights and other intellectual 
property rights and computer programs that are material to the conduct of the 
business of Teletrak and the Teletrak Subsidiaries as now operated, taken as 
a whole (collectively, "Teletrak Intellectual Property Rights"). No claims 
are pending or, to the best knowledge of Teletrak, threatened that Teletrak 
or a Teletrak Subsidiary is infringing or otherwise adversely affecting the 
material rights of any Person and to the best knowledge of Teletrak, no 
Person is infringing the rights of Teletrak or any Teletrak Subsidiary with 
respect to any material item of Teletrak Intellectual Property Rights.

      Section 5.13.  BROKERS.  No broker, investment banker, financial 
advisor or other Person is entitled to any broker's, finder's, financial 
advisor's or other similar fee or commission in connection with the 
transactions contemplated by this Agreement.

      Section 5.14.  INTERESTED PARTY TRANSACTIONS.  Except as  contemplated  
by this  Agreement and except as set forth on Exhibit 5.6, no event has 
occurred that would be required to be reported as a Certain


                                       18
<PAGE>

      Relationship or Related Transaction pursuant to Item 404 of
Regulation S-K promulgated by the SEC.

      Section 5.15.  VOTE REQUIRED.  The approval of the transactions 
described in Section 7.7 hereof by the holders of a majority of the 
outstanding shares of Teletrak Common Stock (the "Teletrak Shareholders' 
Approval") has been obtained by written consent in the form of Exhibit A 
hereto and is the only vote of the holders of any capital stock required to 
approve this Agreement, the Merger and the other transactions contemplated 
hereby. Helm is the beneficial owner of a majority of the Teletrak Common 
Stock and covenants and agrees, to the extent such consent or vote is legally 
required, to consent or vote in favor of the adoption of this Agreement, the 
Merger and the other transactions contemplated hereby.

                                    ARTICLE 6

                     CONDUCT OF BUSINESS PENDING THE MERGER

      Section 6.1.  COVENANTS OF THE PARTIES.  From the date hereof and 
through the Effective Time or the earlier termination of this Agreement in 
accordance with ARTICLE 9 hereof, AES and Teletrak each agree, each as to 
itself and as to each of the Teletrak Subsidiaries, and Helm agrees as to 
Teletrak and the Teletrak Subsidiaries as the case may be, as follows, except 
as expressly permitted or contemplated by this Agreement by Sections 7.6 and 
7.7 hereto, or to the extent the other parties hereto shall otherwise consent 
in writing:

      (a) ORDINARY COURSE OF BUSINESS. AES and Teletrak shall, and shall 
cause its Subsidiaries to, carry on their respective businesses in the usual 
and ordinary course, consistent with past practice, and use all commercially 
reasonable efforts to preserve intact their present business organizations, 
preserve the goodwill and relationships with customers, suppliers and others 
having business dealings with them and, subject to prudent management of 
workforce needs and ongoing programs currently in force, keep available the 
services of their present officers and employees. Neither AES nor Teletrak 
shall, nor shall any party permit any of its Subsidiaries to, enter into a 
new line of business or make any change in the line of business it engages in 
as of the date hereof involving any material investment of assets or 
resources or any material exposure to liability or loss, in the case of AES, 
to AES and in the case of Teletrak, to Teletrak and the Teletrak Subsidiaries.

      (b) CHARTER DOCUMENTS.  Neither AES nor Teletrak shall amend or propose 
to amend its respective certificate or articles of incorporation, or by-laws 
except as expressly contemplated in this Agreement.

      (c) NO ACQUISITIONS. Neither AES nor Teletrak shall, nor shall either 
of them permit any of its Subsidiaries to, acquire, or publicly propose to 
acquire, or agree to acquire, by merger or consolidation with, or by purchase 
or otherwise, a substantial equity interest in or a substantial portion of 
the assets of, any business or any Person, nor shall any party acquire or 
agree to acquire a material amount of assets of any other Person other than 
in the ordinary course of business consistent with past practice.

      (d) ACCOUNTING. Neither AES nor Teletrak shall, nor shall either of 
them permit any of its Subsidiaries to, make any changes in their accounting 
methods or practices,


                                       19
<PAGE>

except as required by law, rule, regulation or GAAP.

      (e) TAX-FREE STATUS. Neither AES nor Teletrak shall, nor shall either 
of them permit any of its Subsidiaries to, take any actions which would, or 
would be reasonably likely to, adversely affect the status of the Merger as a 
tax-free transaction under Section 368(a) of the Code, and each party hereto 
shall use all reasonable efforts to achieve such result.

      (f) AFFILIATE TRANSACTIONS. Except as expressly contemplated by this 
Agreement, neither AES nor Teletrak shall, nor shall either of them permit 
any of its Subsidiaries to, enter into any material agreement or arrangement 
with any of their respective officers, directors, Affiliates or Associates 
(other than wholly-owned Subsidiaries) on terms materially less favorable to 
such party than could be reasonably expected to have been obtained with an 
unaffiliated third party on an arm's-length basis.

      (g) COOPERATION, NOTIFICATION. Each party shall, and shall cause its 
Subsidiaries to, (i) confer on a regular and frequent basis with one or more 
representatives of the other party to discuss, subject to applicable law, 
material operational matters and the general status of its ongoing 
operations; (ii) promptly notify the other party of any significant changes 
in its business, properties, assets, condition (financial or otherwise), 
results of operations or prospects; (iii) advise the other party of any 
change or event which has had or, insofar as reasonably can be foreseen, is 
reasonably likely to result in, in the case of AES, a AES Material Adverse 
Effect or, in the case of Teletrak, a Teletrak Material Adverse Effect; and 
(iv) promptly provide the other party with copies of all filings made by such 
party or any of its Subsidiaries with any court or other Governmental 
Authority in connection with this Agreement and the transactions contemplated 
hereby.

      (h) THIRD-PARTY CONSENTS. AES shall use all commercially reasonable 
efforts to obtain all AES Required Consents. AES shall promptly notify 
Teletrak of any failure or prospective failure to obtain any such consents 
and, if requested by Teletrak, shall provide copies of all AES Required 
Consents obtained by AES to Teletrak. Teletrak shall, and shall cause its 
Subsidiaries to, use all commercially reasonable efforts to obtain all 
Teletrak Required Consents. Teletrak shall promptly notify AES of any failure 
or prospective failure to obtain any such consents and, if requested by AES, 
shall provide copies of all Teletrak Required Consents obtained by Teletrak 
to AES.

      (i) NO BREACH, ETC. No party shall, nor shall any party permit any of 
its Subsidiaries to, willfully take any action that would or is reasonably 
likely to result in a material breach of any provision of this Agreement, or 
in any of its representations and warranties set forth in this Agreement, 
being untrue on and as of the Closing Date.

      (j) DIVIDENDS. Neither AES nor Teletrak shall (i) declare or pay any 
dividends on or make other distributions in respect of any of its capital 
stock; (ii) split, combine or reclassify any of its capital stock or issue or 
authorize or propose the issuance of any other securities in respect of, in 
lieu of, or in substitution for, shares of its capital stock; or (iii) 
redeem, repurchase or otherwise acquire any shares of its capital stock.

      (k) ISSUANCE OF SECURITIES. Neither AES nor Teletrak shall issue, agree 
to issue, deliver, sell, award, pledge, dispose of or otherwise encumber or 
authorize or propose the


                                       20
<PAGE>

issuance, delivery, sale, award, pledge, disposal or other encumbrance of, 
any shares of their capital stock of any class or any securities convertible 
into or exchangeable for, or any rights, warrants or options to acquire, any 
such shares or convertible or exchangeable securities.

      (l) CAPITAL EXPENDITURES.  Teletrak shall not, nor shall Teletrak 
permit any of its Subsidiaries to, make any capital expenditures.

      (m) CONTRACTS. Neither AES nor Teletrak shall, except in the ordinary 
course of business consistent with past practice, modify, amend, terminate, 
renew or fail to use reasonable business efforts to renew any material 
Contract to which such party or any of its Subsidiaries is a party or waive, 
release or assign any material rights or claims.

                                    ARTICLE 7

                              ADDITIONAL AGREEMENTS

      Section 7.1.  ACCESS TO INFORMATION.  Upon reasonable notice, each 
party shall, and shall cause its Subsidiaries to, afford to the officers, 
directors, employees, accountants, counsel, investment bankers, financial 
advisors and other representatives of the other (collectively, 
"Representatives") reasonable access, during normal business hours throughout 
the period from the date hereof through the Effective Time, to all of its 
properties, books, contracts, commitments and records (including, but not 
limited to, Tax Returns), to make such investigation as each party shall 
reasonably request (including the ability to have discussions with suppliers 
and customers of each party) and, during such period, each party shall, and 
shall cause its Subsidiaries to, furnish promptly to the other (i) access to 
each report, schedule and other document filed or received by it or any of 
its Subsidiaries pursuant to the requirements of Federal or state securities 
laws or filed with or sent to the SEC, the Food and Drug Administration, or 
any other Federal, state or foreign regulatory agency or commission, and (ii) 
access to all information concerning themselves, their Subsidiaries, 
directors, officers and shareholders and such other matters as may be 
reasonably requested by the other party in connection with any filings, 
applications or approvals required or contemplated by this Agreement or for 
any other reason related to the transactions contemplated by this Agreement. 
Each party shall, and shall cause its Subsidiaries and Representatives to, 
hold in strict confidence all documents and information concerning the other 
furnished to it in connection with the transactions contemplated by this 
Agreement in accordance with the Confidentiality Agreement, between AES and 
Teletrak, as it may be amended from time to time (the "Confidentiality 
Agreement").

      Section 7.2. REGULATORY MATTERS.

      REGULATORY APPROVALS. Each party hereto shall cooperate and use its 
best efforts to promptly prepare and file all necessary documentation, to 
effect all necessary applications, notices, petitions, filings and other 
documents, and to use all commercially reasonable efforts to file and obtain 
all Governmental Filings and Approvals of all Governmental Authorities 
necessary to consummate the transactions contemplated by this Agreement, 
including, without limitation, the AES Statutory Approvals and the Teletrak 
Statutory Approvals.

      Section 7.3.  PUBLIC ANNOUNCEMENTS.  Subject to each party's disclosure 
obligations imposed by law and securities association listing applications, 
AES, Helm and


                                       21
<PAGE>

Teletrak will consult and cooperate with each other in the development and 
distribution of all news releases and other public information disclosures 
with respect to this Agreement or any of the transactions contemplated hereby 
and shall not issue any public announcement or statement with respect hereto 
or thereto without the consent of the other party (which consent shall not be 
unreasonably withheld).

      Section 7.4.  NO SOLICITATIONS.

      (a) Prior to the Effective Time and consummation of the other 
transactions contemplated by this Agreement, Helm, Teletrak and AES shall 
not, and each shall not authorize or permit any of its Representatives, 
directly or indirectly, (i) to initiate, solicit or encourage (including by 
way of furnishing information), or take any action to facilitate, any 
inquiries or the making of any proposal that constitutes, or may reasonably 
be expected to lead to, a Business Combination Proposal (as defined below) or 
(ii) participate in any discussions or negotiations regarding, or provide any 
non-public information to any Person relating to, any Business Combination 
Proposal (iii) agree to, approve or recommend any Business Combination 
Proposal. For purposes of this Agreement, "Business Combination Proposal" 
means any proposal or offer from any Person (other than a party hereto) 
relating to any direct or indirect acquisition or purchase of 20% or more of 
the assets or 20% or more of any class of outstanding equity securities of 
Teletrak or AES, as the case may be, any tender offer or exchange offer 
which, if consummated, would result in any person beneficially owning 20% or 
more of any class of equity securities of Teletrak or AES, as the case may 
be, or any merger, consolidation, business combination, recapitalization, 
liquidation, dissolution or similar transaction involving Teletrak or AES, as 
the case may be, other than the transactions contemplated by this Agreement.

      (b) In addition to the obligations of Teletrak and AES set forth in 
paragraph (a) of this Section 7.4, Teletrak or AES, as the case may be, shall 
immediately advise the other party hereto orally and in writing (within 24 
hours after the receipt thereof) of any request for confidential information 
or of any Business Combination Proposal or any inquiry regarding the making 
of a Business Combination Proposal and the material terms and the conditions 
of such request, Business Combination Proposal or inquiry. Teletrak or AES, 
as the case may be, will, to the extent reasonably practicable, keep the 
other party hereto fully informed of the status and details (including 
amendments or proposed amendments) of any such request, Business Combination 
Proposal, or inquiry.

      Section 7.5.  TELETRAK BOARD OF DIRECTORS.  Teletrak's Board of 
Directors will take such action as may be necessary to increase the number of 
directors comprising the Board of Directors of Teletrak at the Effective Time 
to six, four of whom shall be designated by AES and two of whom shall be 
designated by Helm, prior to the Effective Time. Helm shall not cause, and 
shall use its best efforts not to permit, the removal of any of the directors 
designated by AES. In the event that any designee of AES shall resign or 
cannot otherwise continue to serve as a director, the remaining designees of 
AES shall designate a replacement therefor and, upon such designation, 
Teletrak and Helm shall use their best efforts to cause the appointment 
and/or election of such designated replacement to the Board of Directors.

      Section 7.6.  RELATED TRANSACTIONS.  Simultaneously with Closing, the 
Persons listed on Schedule 7.6A hereto shall purchase, and Teletrak shall 
sell to such Persons, in the amounts set forth next to their respective names 
on Schedule 7.6A an aggregate of 1,000,000


                                       22
<PAGE>

additional shares of unregistered and restricted Teletrak Common Stock and 
warrants ("Warrants") to purchase up to an aggregate of 500,000 shares of 
Teletrak Common Stock at an exercise price of $2.00 per share for a period of 
three years, and otherwise having such terms as are contained in the form of 
Warrant attached hereto as Exhibit B. Simultaneously with Closing, Herbert M. 
Pearlman and/or certain other management shareholders of Teletrak listed on 
Schedule 7.6B hereto shall purchase, and Teletrak shall sell to such Persons, 
an aggregate of 250,000 unregistered and restricted shares of Teletrak Common 
Stock and 125,000 Warrants (collectively with purchase by the Persons set 
forth on Schedule 7.6A, the "Related Transactions"). The purchase price for 
the shares of Teletrak Common Stock and Warrants to be issued in the Related 
Transactions will be $0.50 in the aggregate for each share of Teletrak Common 
Stock and 0.5 Warrant purchased. Teletrak shall also issue 500,000 Warrants 
to the Old Teletrak Warrant Holders (as defined in Section 7.7 hereof) 
against cancellation of such persons' warrants in the amounts set forth on 
Schedule 7.6C.

      Section 7.7. STOCK SPLIT; DISTRIBUTION; NAME CHANGE; FILING OF 
INFORMATION STATEMENT.  Immediately prior to the Effective Time, Teletrak (i) 
shall effect a reverse stock split and recapitalization such that the total 
number of shares of Teletrak Common Stock outstanding immediately prior to 
the Effective Time will be 2,522,927 (the "Stock Split"), (ii) will 
distribute Warrants (the "Distribution") to all holders of record of Teletrak 
Common Stock at the rate of 0.5 Warrants for each share of Teletrak Common 
Stock outstanding (after giving effect to the Stock Split) and (iii) will 
effect a corporate name change (the "Name Change") to "Teletrak Environmental 
Systems, Inc." Teletrak and Helm shall take all actions necessary to effect 
the foregoing including, without limitation, Helm consenting to the Stock 
Split, the Distribution and the Name Change, amending the certificate of 
incorporation of Teletrak, preparing, filing and mailing an Information 
Statement pursuant to Regulation 14C and Rule 14f-1 of the Securities 
Exchange Act of 1934, as amended and mailing the notice required pursuant to 
Section 228 of the Delaware General Corporation Law (the "Information 
Statement"). After giving effect to the Stock Split, the Distribution, the 
Related Transactions and the Merger, the capitalization of Teletrak shall be 
as set forth on Exhibit C hereto (the "Post-Closing Capitalization"). Helm 
agrees to surrender such number of shares of Teletrak Common Stock, warrants 
and other securities of Teletrak currently owned by Helm, and Teletrak shall 
take all other actions, as are necessary to achieve the Post-Closing 
Capitalization including, without limitation, obtaining waivers and releases 
of all holders of currently outstanding warrants (the "Old Teletrak Warrant 
Holders") to purchase Teletrak common stock in form satisfactory to AES 
cancelling such warrants.

      Section 7.8.  EXPENSES.  All costs and expenses incurred in connection 
with this Agreement and the transactions contemplated hereby shall be paid by 
the party incurring such expenses; PROVIDED, HOWEVER, that Teletrak shall pay 
or reimburse AES and its shareholders for their expenses if the Merger is 
consummated, and shall pay for the costs of printing and mailing the 
Information Statement, new stock certificates and related documents.

      Section 7.9.  BEST EFFORTS.  Subject to the terms and conditions of 
this Agreement, each of the parties agrees to use best efforts to take, or 
cause to be taken, all actions, and to do, or cause to be done, and to assist 
and cooperate with the other parties in doing, all things necessary, proper 
or advisable under applicable law to consummate and make effective, in the 
most expeditious manner practicable, the Merger and the other transactions 
contemplated by this Agreement, including (i) the obtaining of all necessary 
actions or nonactions, waivers,


                                       23
<PAGE>

consents and approvals from Governmental Authorities and the making of all 
necessary registrations and filings and the taking of all steps as may be 
necessary to obtain an approval or waiver from, or to avoid an action or 
proceeding by, any Governmental Authority, (ii) the obtaining of all 
necessary consents, approvals or waivers from third parties, (iii) the 
defending of any lawsuits or other legal proceedings, whether judicial or 
administrative, challenging this Agreement or the consummation of the 
transactions contemplated by this Agreement, including seeking to have any 
stay or temporary restraining order entered by any court or other 
Governmental Authority vacated or reversed, and (iv) the execution and 
delivery of any additional instruments necessary to consummate the 
transactions contemplated by, and to fully carry out the purposes of, this 
Agreement.

                                   ARTICLE 8

                                  CONDITIONS

      Section 8.1.  CONDITIONS TO EACH PARTY'S OBLIGATION TO EFFECT THE 
MERGER.  The respective obligations of each party to effect the Merger shall 
be subject to the satisfaction on or prior to the Closing Date of the 
following conditions, except, to the extent permitted by applicable law, that 
any of such conditions may be waived in writing pursuant to Section 9.5 
hereof by the joint action of the parties hereto:

      (a) SHAREHOLDER APPROVAL.  The AES Shareholders' Approval shall have 
been obtained.

      (b) NO INJUNCTION. No temporary restraining order or preliminary or 
permanent injunction or other order by any Federal, state or foreign court or 
other legal or regulatory restraint or prohibition preventing consummation of 
the Merger shall have been issued and be continuing in effect, nor shall any 
proceeding brought by a Governmental Authority seeking any of the foregoing 
be pending, nor shall there be any action taken, or any statute, rule, 
regulation or order enacted, entered, enforced or deemed applicable to the 
Merger which makes the consummation of the Merger illegal, and the Merger and 
the other transactions contemplated hereby shall not have been prohibited 
under any applicable Federal or state law or regulation.

      (c) STATUTORY APPROVALS.  The AES Statutory Approvals and the Teletrak 
Statutory Approvals shall have been obtained at or prior to the Effective 
Time.

      (d) OTC BULLETIN BOARD. The shares of Teletrak Common Stock to be 
issued pursuant to the Merger and this Agreement (including, without 
limitation, shares reserved for issuance upon exercise of the Warrants) shall 
have been approved for quotation on The OTC Bulletin Board.

      Section 8.2.  CONDITIONS TO OBLIGATION OF TELETRAK TO EFFECT THE 
MERGER.  The obligation of Teletrak to effect the Merger shall be further 
subject to the satisfaction, on or prior to the Closing Date, of the 
following additional conditions, except as any of such conditions may be 
waived by Teletrak in writing pursuant to Section 9.4 hereof:

      (a) PERFORMANCE OF OBLIGATIONS OF AES. AES shall have performed in all 
material respects its agreements and covenants contained in or contemplated 
by this Agreement


                                       24
<PAGE>

required to be performed by it at or prior to the Effective Time.

      (b) REPRESENTATIONS AND WARRANTIES. The representations and warranties 
of AES set forth in this Agreement shall be true and correct (i) on and as of 
the date hereof and (ii) on and as of the Closing Date with the same effect 
as though such representations and warranties had been made on and as of the 
Closing Date (except for representations and warranties that expressly speak 
only as of a specific date or time other than the date hereof or the Closing 
Date which need only be true and correct as of such date or time) except in 
each of cases (i) and (ii) for (x) changes expressly contemplated by this 
Agreement, and (y) such failures of representations or warranties to be true 
and correct which could not, individually or in the aggregate, reasonably be 
expected to result in a AES Material Adverse Effect.

      (c) AES REQUIRED CONSENTS.  The AES Required Consents shall have been 
obtained.

      (d) EXEMPTION FROM SECURITIES ACT. The issuance of the Teletrak Common 
Stock pursuant to this Agreement shall, based upon information provided to 
Teletrak by AES and its shareholders, qualify as an offering exempt from 
registration under the Securities Act pursuant to Regulation D promulgated 
under Section 4(2) of the Securities Act and with the requirements of all 
other regulations currently in effect relating to "private offerings" of the 
type made by Teletrak hereunder and AES shall have distributed all materials 
to its shareholders which conform with and satisfy the above requirements. 
Any issuance by Teletrak of Teletrak Common Stock hereunder to any of the AES 
shareholders shall, based upon information provided by AES and its 
shareholders, qualify as an offering exempt from registration under the 
securities laws, rules and regulations of any of the Teletrak in which any of 
the AES shareholders reside.

      Section 8.3.  CONDITIONS TO OBLIGATION OF AES TO EFFECT THE MERGER.  
The obligation of AES to effect the Merger shall be further subject to the 
satisfaction, on or prior to the Closing Date, of the following additional 
conditions, except as any of such conditions may be waived by AES in writing 
pursuant to Section 9.4 hereof:

      (a) PERFORMANCE OF OBLIGATIONS OF TELETRAK. Teletrak (and/or the 
appropriate Subsidiary) shall have performed in all material respects its 
agreements and covenants contained in or contemplated by this Agreement 
required to be performed at or prior to the Effective Time.

      (b) REPRESENTATIONS AND WARRANTIES. The representations and warranties 
of Teletrak set forth in this Agreement shall be true and correct (i) on and 
as of the date hereof and (ii) on and as of the Closing Date with the same 
effect as though such representations and warranties had been made on and as 
of the Closing Date (except for representations and warranties that expressly 
speak only as of a specific date or time other than the date hereof or the 
Closing Date which need only be true and correct as of such date or time) 
except in each of cases (i) and (ii) for (x) changes expressly contemplated 
by this Agreement and (y) such failures of representations or warranties to 
be true and correct which could not, individually or in the aggregate, 
reasonably be expected to result in a Teletrak or Helm Material Adverse 
Effect.

      (c) STOCK SPLIT; DISTRIBUTION; NAME CHANGE.  The Stock Split, the 
Distribution and the Name Change shall have been effected by Teletrak and 
duly approved by the Teletrak shareholders.


                                       25
<PAGE>

      (d) TELETRAK REQUIRED CONSENTS.  The Teletrak Required Consents shall 
have been obtained.

      (e) EXEMPTION FROM SECURITIES ACT. The issuance of the Teletrak Common 
Stock pursuant to this Agreement shall, based upon information provided to 
Teletrak by AES and its shareholders, qualify as an offering exempt from 
registration under the Securities Act pursuant to Regulation D promulgated 
under Section 4(2) of the Securities Act of 1933, as amended, and with the 
requirements of all other regulations currently in effect relating to 
"private offerings" of the type made by Teletrak hereunder and AES shall have 
distributed all materials to its shareholders which conform with and satisfy 
the above requirements. Any issuance by Teletrak of Teletrak Common Stock 
hereunder to any of the AES shareholders shall, based upon information 
provided by AES and its shareholders, qualify as an offering exempt from 
registration under the securities laws, rules and regulations of any of the 
States in which any of the AES shareholders reside.

                                   ARTICLE 9

                      TERMINATION, AMENDMENT AND WAIVER

      Section 9.1.  TERMINATION.  This Agreement may be terminated at any 
time prior to the Closing Date, whether before or after approval by the 
shareholders of the respective parties hereto contemplated by this Agreement, 
only:

      (a) by mutual written consent of the Boards of Directors of AES and 
Teletrak;

      (b) by any party hereto, by written notice to the other parties, if the 
Effective Time shall not have occurred on or before September 30, 1998 ; 
PROVIDED, HOWEVER, that the right to terminate the Agreement under this 
Section 9.1(b) shall not be available to any party whose failure to fulfill 
any obligation or condition under this Agreement has been the cause of, or 
resulted in, the failure of the Effective Time to occur on or before such 
date;

      (c) by any party hereto, if any foreign, state or Federal law, order, 
rule or regulation is adopted or issued, which has the effect, as supported 
by the written opinion of outside counsel for such party, of prohibiting the 
Merger, or by any party hereto if any court of competent jurisdiction or any 
Governmental Authority in the United States or any State shall have issued an 
order, judgment, decree or ruling or taken any action permanently 
restraining, enjoining or otherwise prohibiting the Merger, and such order, 
judgment, decree or ruling shall have become final and nonappealable;

      Section 9.2.  EFFECT OF TERMINATION.  In the event of termination of 
this Agreement by either AES or Teletrak pursuant to Section 9.1 hereof, this 
Agreement shall forthwith become void and there shall be no liability or 
obligation on the part of either AES, Teletrak or Subsidiary or their 
respective officers or directors hereunder, except that the agreement 
contained in the last sentence of Section 7.1 hereof, Section 9.1, this 
Section 9.2 and ARTICLES 10 and 11 hereof shall survive the termination; 
PROVIDED, HOWEVER, nothing herein


                                       26
<PAGE>

shall relieve any party of liability for any breach of the provisions of this 
Agreement.

      Section 9.3.  AMENDMENT.  This Agreement may be amended by the parties 
hereto (by action taken or authorized by their respective Boards of 
Directors), at any time before or after approval hereof by the shareholders 
of AES and prior to the Effective Time, but after such approval, no such 
amendment shall (i) alter or change the Ratio, (ii) alter or change any of 
the terms and conditions of this Agreement if any of the alterations or 
changes, alone or in the aggregate, would materially adversely affect the 
rights of holders of AES Common Stock or Teletrak Common Stock, or (iii) 
alter or change any term of the certificate of incorporation of Teletrak as 
approved by the shareholders of Teletrak, except for alterations or changes 
that could otherwise, by law, be adopted by the Board of Directors of 
Teletrak, without the further approval of such shareholders, as applicable. 
This Agreement may not be amended except by an instrument in writing signed 
on behalf of each of the parties hereto.

      Section 9.4.  WAIVER.  At any time prior to the Effective Time, by 
action taken or authorized by their respective Boards of Directors, the 
parties hereto may (a) extend the time for the performance of any of the 
obligations or other acts of the other parties hereto, (b) waive any 
inaccuracies in the representations and warranties of the other parties 
hereto contained herein or in any document delivered pursuant hereto and (c) 
waive compliance with any of the agreements or conditions contained herein 
for its benefit alone, to the extent permitted by applicable law. Any 
agreement on the part of a party hereto to any such extension or waiver shall 
be valid if set forth in an instrument in writing signed on behalf of such 
party.

                                  ARTICLE 10

                               INDEMNIFICATION.

      Section 10.1.  TELETRAK AND HELM INDEMNIFICATION.  Teletrak and Helm 
hereby jointly and severally agree to indemnify, hold harmless and pay and 
reimburse AES, and its officers, directors, employees, agents and controlling 
persons, from and against (i) any and all losses, obligations, liabilities, 
damages, claims, deficiencies, costs and expenses (including, but not limited 
to, the amount of any settlement entered into pursuant hereto and all 
reasonable legal and other expenses incurred in connection with the 
investigation, prosecution, or defense of the matter), which may be asserted 
against or sustained or incurred by any or all of the indemnified parties in 
connection with, arising out of or relating to any breach or alleged breach 
of any of the representations, warranties, agreements and covenants made by 
any or all of the indemnifying parties in connection with this Agreement, 
(ii) any untrue or alleged untrue statement of a material fact contained in 
the Information Statement or the omission or alleged omission to state a 
material fact required to be stated therein or necessary to make the 
statements therein not misleading (a "Violation") and (iii) any and all costs 
and expenses (including, but not limited to, reasonable legal fees and 
expenses) incurred by any or all of the indemnified parties in connection 
with the enforcement of their rights under this Section 10 (all amounts 
described in preceding clauses (i), (ii) and (iii) above to be hereafter 
collectively referred to as "Losses").

      Section 10.2.  AES INDEMNIFICATION.  AES agrees to indemnify, hold 
harmless, pay and reimburse Teletrak and Helm and their officers, directors, 
employees, agents and controlling persons from and against a Violation to the 
extent that such Violation shall occur in respect of information furnished to 
Teletrak by AES expressly for use in the Information


                                       30
<PAGE>

Statement.

      Section 10.3.  PARTIES FOR INDEMNIFICATION.  In the event that any 
claim is asserted against any party hereto, or any party hereto is made a 
party defendant in any action or proceeding, and such claim, action or 
proceeding involves a matter which is the subject of this indemnification, 
then such party (an "Indemnified Party") shall give written notice to the 
other parties hereto (the "Indemnifying Parties") of such claim, action or 
proceeding, and such Indemnifying Parties shall have the right to join in the 
defense of said claim, action or proceeding at such Indemnifying Parties' own 
cost and expense and, if the Indemnifying Party agrees in writing to be bound 
by and to promptly pay the full amount of any final judgment from which no 
further appeal may be taken and if the Indemnified Party is reasonably 
assured of the Indemnifying Parties' ability to satisfy such agreement, then 
at the option of the Indemnifying Parties, such Indemnifying Parties may take 
over the defense of such claim, action or proceeding, except that, in such 
case, the Indemnified Party shall have the right to join in the defense of 
said claim, action or proceeding at its own cost and expense. So long as the 
Indemnifying Parties are reasonably contesting any claim in good faith, the 
Indemnified Party shall not pay or settle any such claim unless it shall 
waive any right to indemnity therefor from or by the Indemnifying Parties.

                                   ARTICLE 11

                              GENERAL PROVISIONS

      Section 11.1.  SURVIVAL.  The representations and warranties in this 
Agreement shall survive the Effective Time for a period of 18 months. The 
covenants and agreements contained herein shall survive indefinitely.

      Section 11.2.  NOTICES.  All notices and other communications hereunder 
shall be in writing and shall be deemed given if (i) when delivered, if 
delivered personally, (ii) one day after being given if sent by reputable 
overnight courier service, (iii) upon being telecopied (which is confirmed), 
or (iv) five days after being mailed by registered or certified mail (return 
receipt requested) to the parties at the following addresses (or at such 
other address for a party as shall be specified by like notice):

         (a)      If to Teletrak, Helm or Acquisition Sub, to:

                  c/o Helm Capital Group Inc.
                  537 Steamboat Road
                  Greenwich, Connecticut  06830
                  Attn.:  Herbert M. Pearlman
                  with a copy to Clare J. Attura, Esq.

                  Facsimile No.:(203) 629-1961

         (b)      If to AES, to:

                  c/o Gould & Eberhardt
                  #2 Sutton Road


                                       28
<PAGE>

                  Webster, Massachusetts  01570-1190
                  Attn.:  Gerd Reinig

                  Facsimile No.:  (508) 949-0151

                  with a copy to:

                  Pryor Cashman Sherman & Flynn LLP
                  410 Park Avenue
                  New York, New York  10022
                  Attn.:  Richard S. Frazer, Esq.

                  Facsimile No.:  (212)  326-0806

      Section 11.3.  MISCELLANEOUS.  This Agreement (including the documents 
and instruments referred to herein) (i) constitutes the entire agreement and 
supersedes all other prior agreements and understandings, both written and 
oral, among the parties, or any of them, with respect to the subject matter 
hereof other than the Confidentiality Agreement; (ii) shall not be assigned 
by operation of law or otherwise; and (iii) shall be governed by and 
construed in accordance with the laws of the State of New York applicable to 
contracts executed in and to be fully performed in such State, without giving 
effect to its conflicts of law, rules or principles except to the extent the 
provisions of this Agreement are expressly governed by the MBCL.

      Section 11.4.  INTERPRETATION; DEFINITIONS.  When a reference is made 
in this Agreement to Articles, Sections or Schedules, such reference shall be 
to an Article or a Section or Schedule of this Agreement, respectively, 
unless otherwise indicated. The table of contents and headings contained in 
this Agreement are for reference purposes only and shall not affect in any 
way the meaning or interpretation of this Agreement. Whenever the words 
"include", "includes" or "including" are used in this Agreement, they shall 
be deemed to be followed by the words "without limitation". "Person" shall 
mean any natural person, corporation, business trust, joint venture, 
association, company, firm, partnership, or other Person. The term 
"Subsidiary" of a Person shall mean any corporation or other Person 
(including partnerships and other business associations) of which at least a 
majority of the outstanding capital stock or other voting securities having 
voting power under ordinary circumstances to elect directors or similar 
members of the governing body of such corporation or other entity shall at 
the time be held, directly or indirectly, by such Person. The term "Teletrak 
Subsidiary" shall mean the Subsidiaries of Teletrak. The terms "Affiliate" 
and "Associate" shall have the respective meanings set forth in Rule 405 of 
the Securities Act (except as otherwise specifically defined herein).

      Section 11.5.  COUNTERPARTS; EFFECT.  This Agreement may be executed 
in two or more counterparts, each of which shall be deemed to be an original, 
but all of which shall constitute one and the same agreement.

      Section 11.6.  ENFORCEMENT.  The parties agree that irreparable damage 
would occur in the event that any of the provisions of this Agreement were 
not performed in accordance with their specific terms or were otherwise 
breached. It is accordingly agreed that the parties shall be entitled to an 
injunction or injunctions to prevent breaches of this Agreement and to 
enforce


                                       29
<PAGE>

specifically the terms and provisions of this Agreement in any court 
of the United States located in the State of New York or in New York state 
court, this being in addition to any other remedy to which they are entitled 
at law or in equity. In addition, each of the parties hereto (a) consents to 
submit itself to the personal jurisdiction of any Federal court located in 
the State of New York or any New York state court in the event any dispute 
arises out of this Agreement or any of the transactions contemplated by this 
Agreement, (b) agrees that it will not attempt to deny such personal 
jurisdiction by motion or other request for leave from any such court and (c) 
agrees that it will not bring any action relating to this Agreement or any of 
the transactions contemplated by this Agreement in any court other than a 
Federal or state court sitting in the State of New York.

      Section 11.7.  NO THIRD PARTY BENFICIARIES.  Nothing contained herein 
is intended to or shall confer on any Person which is not a party to this 
Agreement any rights under this Agreement.

      Section 11.8.  ASSIGMENT.  Except as expressly set forth herein, 
neither this Agreement nor any of the rights, interests or obligations 
hereunder shall be assigned by any of the parties hereto (whether by 
operation of law or otherwise) without the prior written consent of the other 
parties hereto. Subject to the preceding sentence, this Agreement will be 
binding upon, inure to the benefit of and be enforceable by the parties and 
their respective successors and assigns.






                                       30
<PAGE>

      IN WITNESS WHEREOF, AES, Teletrak, Helm and Acquisition Sub
have caused this Agreement to be signed by their respective officers thereunto
duly authorized as of the date first written above.

                                      ADVANCED ENVIRONMENTAL SYSTEMS, INC

                                      By:
                                         --------------------------------------
                                         Name:
                                         Title:

                                      TELETRAK ADVANCED TECHNOLOGY SYSTEMS, INC.

                                      By:
                                         --------------------------------------
                                         Name:
                                         Title:


                                      HELM CAPITAL GROUP, INC.

                                      By:
                                         --------------------------------------
                                         Name:
                                         Title:


                                      AES ACQUISITION CORP.

                                      By:
                                         --------------------------------------
                                         Name:
                                         Title:




                                      31

<PAGE>

                                                                    Exhibit 10.2

THIS WARRANT AND THE SHARES OF COMMON STOCK ISSUABLE UPON EXERCISE HEREOF
(COLLECTIVELY THE "SECURITIES") HAVE BEEN ACQUIRED FOR INVESTMENT ONLY AND HAVE
NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT") OR
ANY STATE SECURITIES LAW, AND MAY NOT BE SOLD, PLEDGED, HYPOTHECATED, OR
OTHERWISE TRANSFERRED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT
UNDER THE ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO TELETRAK
ENVIRONMENTAL SYSTEMS, INC. THAT AN EXEMPTION FROM SUCH REGISTRATION IS
AVAILABLE.


                      TELETRAK ENVIRONMENTAL SYSTEMS, INC.

                    COMMON STOCK PURCHASE WARRANT CERTIFICATE
                                TO PURCHASE 0,000
                             SHARES OF COMMON STOCK

Cert. No. TES-1

     This Warrant Certificate certifies that                HOLDER          , 
with offices at                      ADDRESS                    or its 
registered assigns is the registered Holder (the "Holder") of    ,000 Common 
Stock Purchase Warrants (the "Warrants") to purchase shares of the common 
stock, $.01 par value (the "Common Stock") of TELETRAK ENVIRONMENTAL SYSTEMS, 
INC., a Delaware corporation (the "Company").

     1.   EXERCISE OF WARRANT.

          (A) Each Warrant enables the Holder, subject to the provisions of this
Warrant Certificate to purchase from the Company at any time and from time to
time commencing on the date hereof (the "Initial Exercise Date") one (1) fully
paid and non-assessable share of Common Stock ("Shares") upon due presentation
and surrender of this Warrant Certificate accompanied by payment of the purchase
price of $2.00 per Share (the "Exercise Price"). The Warrants shall expire on
October 31, 2001 (the "Expiration Date"). Payment shall be made in lawful money
of the United States of America by certified check payable to the Company at its
principal office at 2 Sutton Road, Webster, MA 01570. As hereinafter provided,
the Exercise Price and number of Shares purchasable upon the exercise of the
Warrants may be subject to modification or adjustment upon the happening of
certain events.

          (B) This Warrant Certificate is exercisable at any time on or after
the Initial Exercise Date in whole or in part by the Holder in person or by
attorney duly authorized in writing at the principal office of the Company.

          (C) The Warrants shall be redeemable, at the option of the Company, at
a price of $.05 per Warrant, upon not less than thirty (30) days' written notice
to the Holder at such time as (i) the Common Stock of 

<PAGE>


the Company trades for at least $3.00 on each of 3 consecutive trading days on
any national securities exchange on which the Common Stock may be listed or in
the over the counter market or OTC Bulletin Board, and (ii) the shares issuable
upon exercise of the Warrants are registered pursuant to an effective
registration statement under the Securities Act of 1933, as amended (hereinafter
the "Act").

     2.   EXCHANGE, FRACTIONAL SHARES, TRANSFER.

          (A) Upon surrender to the Company, this Warrant Certificate may be
exchanged for another Warrant Certificate or Warrant Certificates evidencing a
like aggregate number of Warrants. If this Warrant Certificate shall be
exercised in part, the Holder shall be entitled to receive upon surrender hereof
another Warrant Certificate or Warrant Certificates evidencing the number of
Warrants not exercised;

          (B) Anything herein to the contrary notwithstanding, in no event shall
the Company be obligated to issue Warrant Certificates evidencing other than a
whole number of Warrants or issue certificates evidencing other than a whole
number of Shares upon the exercise of this Warrant Certificate; PROVIDED,
HOWEVER, that the Company shall pay with respect to any such fraction of a Share
an amount of cash based upon the current public market value (or book value, if
there shall be no public market value) for Shares purchasable upon exercise
hereof. Market price for the purpose of this Section 2 shall mean the last
reported sale price on the American Stock Exchange or such primary exchange on
which the Common Stock is traded.

          (C) The Company may deem and treat the person in whose name this
Warrant Certificate is registered as the absolute true and lawful owner hereof
for all purposes whatsoever; and

          (D) This Warrant Certificate may not be transferred except in
compliance with the provisions of the Act or applicable state securities laws
and in accordance with the provisions of Paragraph 8 hereof.

     3. RIGHTS OF A HOLDER. No Holder shall be deemed to be the Holder of Common
Stock or any other securities of the Company that may at any time be issuable on
the exercise hereof for any purpose, nor shall anything contained herein be
construed to confer upon the Holder any of the rights of a shareholder of the
Company or any right to vote for the election of directors or upon any matter
submitted to shareholders at any meeting thereof or to give or withhold consent
to any corporate action (whether upon any reorganization, issuance of stock,
reclassification or conversion of stock, change of par value, consolidation,
merger, conveyance, or otherwise) or to receive notice of meetings or to receive
dividends or subscription rights or otherwise until a Warrant shall have been
exercised and the Common Stock purchasable upon the exercise thereof shall have
become issuable.


<PAGE>

     4. REGISTRATION OF TRANSFER. The Company shall maintain books for the
transfer and registration of Warrants. Upon the transfer of any Warrants in
accordance with the provisions of Section 2(D) hereof, (a "Permitted Transfer"),
the Company shall issue and register the Warrants in the names of the new
Holders. The Warrants shall be signed manually by the Chairman, Chief Executive
Officer, President or any Vice President and the Secretary or Assistant
Secretary of the Company. The Company shall transfer, from time to time, any
outstanding Warrants upon the books to be maintained by the Company for such
purpose upon surrender thereof for transfer properly endorsed or accompanied by
appropriate instructions for transfer. Upon any Permitted Transfer, a new
Warrant Certificate shall be issued to the transferee and the surrendered
Warrants shall be cancelled by the Company. Warrants may be exchanged at the
option of the Holder, when surrendered at the office of the Company, for another
Warrant, or other Warrants of different denominations, of like tenor and
representing in the aggregate the right to purchase a like number of Shares.
Subject to the terms of this Warrant Certificate, upon such surrender and
payment of the purchase price at any time after the Initial Exercise Date, the
Company shall issue and deliver with all reasonable dispatch to or upon the
written order of the Holder of such Warrants and in such name or names as such
Holder may designate, a certificate or certificates for the number of full
Shares so purchased upon the exercise of such Warrants. Such certificate or
certificates shall be deemed to have been issued and any person so designated to
be named therein shall be deemed to have become the Holder of record of such
Shares as of the date of the surrender of such Warrants and payment of the
purchase price; PROVIDED, HOWEVER, that if, at the date of surrender and
payment, the transfer books of the Shares shall be closed, the certificates for
the Shares shall be issuable as of the date on which such books shall be opened
and until such date the Company shall be under no duty to deliver any
certificate for such Shares; PROVIDED, FURTHER, HOWEVER, that such transfer
books, unless otherwise required by law or by applicable rule of any national
securities exchange, shall not be closed at any one time for a period longer
than 20 days. The rights of purchase represented by the Warrants shall be
exercisable, at the election of the Holders, either as an entirety or from time
to time for only part of the Shares at any time on or after the Initial Exercise
Date.

     5. STAMP TAX. The Company will pay any documentary stamp taxes attributable
to the initial issuance of the Shares issuable upon the exercise of the
Warrants; PROVIDED, HOWEVER, that the Company shall not be required to pay any
tax or taxes which may be payable in respect of any transfer involved in the
issuance or delivery of any certificates for Shares in a name other than that of
the Holder in respect of which such Shares are issued, and in such case the
Company shall not be required to issue or deliver any certificate for Shares or
any Warrant until the person requesting the same has paid to the Company the
amount of such tax or has established to the Company's satisfaction that such
tax has been paid.


                                       3
<PAGE>


     6. LOST, STOLEN OR MUTILATED CERTIFICATES. In case this Warrant Certificate
shall be mutilated, lost, stolen or destroyed, the Company may, in its
discretion, issue and deliver in exchange and substitution for and upon
cancellation of the mutilated Warrant Certificate, or in lieu of and
substitution for the lost, stolen or destroyed Warrant Certificate, a new
Warrant Certificate of like tenor representing an equivalent right or interest,
but only upon receipt of evidence satisfactory to the Company of such loss,
theft or destruction and an indemnity, if requested, also satisfactory to it.

     7. RESERVED SHARES. The Company warrants that there have been reserved, and
covenants that at all times in the future it shall keep reserved, out of the
authorized and unissued Common Stock, a number of Shares sufficient to provide
for the exercise of the rights of purchase represented by this Warrant
Certificate. The Company agrees that all Shares issuable upon exercise of the
Warrants shall be, at the time of delivery of the certificates for such Shares,
validly issued and outstanding, fully paid and non-assessable and that the
issuance of such Shares will not give rise to preemptive rights in favor of
existing stockholders.

     8. TRANSFER TO COMPLY WITH THE SECURITIES ACT OF 1933.

          (A) The Holder of this Warrant Certificate, each transferee hereof and
any Holder and transferee of any Shares, by his acceptance thereof, agrees that
(a) no public distribution of Warrants or Shares will be made in violation of
the Act, and (b) during such period as the delivery of a prospectus with respect
to Warrants or Shares may be required by the Act, no public distribution of
Warrants or Shares will be made in a manner or on terms different from those set
forth in, or without delivery of, a prospectus then meeting the requirements of
Section 10 of the Act and in compliance with applicable state securities laws.
The Holder of this Warrant Certificate and each transferee hereof further agrees
that if any distribution of any of the Warrants or Shares is proposed to be made
by them otherwise than by delivery of a prospectus meeting the requirements of
Section 10 of the Act, such action shall be taken only after submission to the
Company of an opinion of counsel, reasonably satisfactory in form and substance
to the Company's counsel, to the effect that the proposed distribution will not
be in violation of the Act or of applicable state law. Furthermore, it shall be
a condition to the transfer of the Warrants that any transferee thereof deliver
to the Company his written agreement to accept and be bound by all of the terms
and conditions contained in this Warrant Certificate.

          (B) This Warrant or the Shares or any other security issued or
issuable upon exercise of this Warrant may not be sold or otherwise disposed of
except as follows:



                                       4
<PAGE>

               (1) To a person who, in the opinion of counsel for the Holder
reasonably acceptable to the Company, is a person to whom this Warrant or Shares
may legally be transferred without registration and without the delivery of a
current prospectus under the Act with respect thereto and then only against
receipt of an agreement of such person to comply with the provisions of this
Section (1) with respect to any resale or other disposition of such securities
which agreement shall be satisfactory in form and substance to the Company and
its counsel; provided that the foregoing shall not apply to any such Warrant,
Shares or other security as to which such Holder shall have received an opinion
letter from counsel to the Company as to the exemption thereof from the
registration under the Act pursuant to Rule 144(k) under the Act; or

               (2) To any person upon delivery of a prospectus then meeting the
requirements of the Act relating to such securities and the offering thereof for
such sale or disposition.

          (C) Each certificate for Shares issued upon exercise of this Warrant
shall bear a legend relating to the non-registered status of such Shares under
the Act, unless at the time of exercise of this Warrant such Shares are subject
to a currently effective registration statement under the Act. 

     9.   ADJUSTMENTS.

          (A) In the event of a reorganization, recapitalization,
reclassification, stock split or exchange, stock dividend, combination of
shares, merger or consolidation in which the Company is the continuing
corporation or any other similar change in Common Stock of the Company, the
Board of Directors may, in its sole discretion, make such equitable,
proportionate adjustment, if any, as it deems appropriate in the number of
Shares covered by this Warrant Certificate and in the exercise price hereunder,
in order to preserve the Holder's proportionate interest in the Company and to
maintain the aggregate exercise price.

          (B) In the event that the Company shall, at any time prior to the
exercise of this Warrant, (a) declare or pay to holders of Common Stock a
dividend payable in any security of the Company other than Common Stock or
securities convertible into common stock; (b) transfer its property as an
entirety or substantially as an entirety to any other company; (c) make any
distribution of its assets to holders of its Common Stock as a liquidation or
partial liquidation dividend or by way of return of capital; or (d) undergo a
merger or consolidation in which the Company is not the continuing corporation;
then, upon the subsequent exercise of this Warrant, the Holder shall receive, in
addition to or in substitution for the shares of Common Stock to which it would
otherwise be entitled upon such exercise, such additional securities of the
Company, or such shares of the securities or property of the Company resulting
from such transfer, or such assets of the Company, or such shares of the
securities or property of the continuing corporation in the 


                                       5
<PAGE>

event of such merger or consolidation, which it would have been entitled to
receive had it exercised this Warrant prior to the happening of any of the
foregoing events.

     10.  MISCELLANEOUS.

          (A) LAW TO GOVERN. This Warrant shall be governed by and construed in
accordance with the substantive laws of the State of Massachusetts, without
giving effect to conflict of laws principles.

          (B) ENTIRE AGREEMENT. This Warrant Certificate constitutes and
expresses the entire understanding between the parties hereto with respect to
the subject matter hereof, and supersedes all prior and contemporaneous
agreements and understandings, inducements or conditions whether express or
implied, oral or written. Neither this Warrant Certificate nor any portion or
provision hereof may be changed, waived or amended orally or in any manner other
than by an agreement in writing signed by the Holder and the Company.

          (C) NOTICES. Except as otherwise provided in this Warrant Certificate,
all notices, requests, demands and other communications required or permitted
under this Warrant Certificate or by law shall be in writing and shall be deemed
to have been duly given, made and received only when delivered against receipt
or when deposited in the United States mails, certified or registered mail,
return receipt requested, postage prepaid, addressed as follows:

        Company:         Teletrak Environmental Systems, Inc.
                         2 Sutton Avenue
                         Webster, MA   01570
                         Attn:  President

        Holder:          At the address shown for the Holder in the
                         registration book maintained by the Company.

          (D) SEVERABILITY. If any provision of this Warrant Certificate is
prohibited by or is unlawful or unenforceable under any applicable law of any
jurisdiction, such provision shall, as to such jurisdiction be in effect to the
extent of such prohibition without invalidating the remaining provisions hereof;
provided, however, that any such prohibition in any jurisdiction shall not
invalidate such provision in any other jurisdiction; and provided, further that
where the provisions of any such applicable law may be waived, that they hereby
are waived by the Company and the Holder to the full extent permitted by law and
to the end that this Warrant instrument shall be deemed to be a valid and
binding agreement in accordance with its terms.


     IN WITNESS WHEREOF, Teletrak Environmental Systems, Inc. has caused this 
Warrant Certificate to be signed by its duly authorized officers as of the 
   th day of                , 1998.


                                       6
<PAGE>

                                TELETRAK ENVIRONMENTAL SYSTEMS, INC.


                                By:
                                    ------------------
                                Name:  Gerd E. Reinig
                                Title: President


Attest:




Secretary


                                  PURCHASE FORM



To:  Teletak Environmental Systems, Inc.


                ,       



     The undersigned hereby irrevocably elects to exercise the attached 
Warrant Certificate, Certificate No. TES-         , to the extent of Shares 
of Common Stock, $.0l par value per share of Teletrak Environmental Systems, 
INC., and hereby makes payment of $            in payment of the aggregate 
exercise price thereof.


                   INSTRUCTIONS FOR REGISTRATION OF SECURITIES



Name:                                                           

                  (Please typewrite or print in block letters)


Address:                                                        



By:


                                       7


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