CORE TECHNOLOGIES PENNSYLVANIA INC
8-K, 1998-06-30
ELECTRICAL APPARATUS & EQUIPMENT, WIRING SUPPLIES
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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 (Date of earliest event reported): June 8, 1998
                                                          --------------


                     CORE TECHNOLOGIES (PENNSYLVANIA), INC.
             -----------------------------------------------------
             (Exact Name of Registrant as Specified in its Charter)


<TABLE>
<S>                                  <C>                                <C>
        DELAWARE                          000-17577                         22-2537194
- -------------------------------------------------------------------------------------------
(State or other Jurisdiction        (Commission File Number)             (I.R.S. Employer
    of incorporation)                                                   Identification No.)
</TABLE>


110 Summit Drive, Exton, PA                                     19341
- ------------------------------------------------------------------------------
(Address of principal executive offices)                      (Zip Code)


       Registrant's telephone number, including area code: (610) 524-7000
                                                          -----------------
<PAGE>

ITEM 2.  ACQUISITION OR DISPOSITION OF ASSETS

         On June 8, 1998 (the "Closing"), the Company's wholly owned subsidiary,
Maris Equipment Company ("Maris") sold substantially all of the assets of its
security and control system integration and installation business to Security
Technologies Group, Inc., a privately held New Jersey corporation (the "Buyer"
or "STG"). The Company will now focus on the indoor air quality and
hospital/healthcare environmental control business of its subsidiary Airo Clean,
Inc. ("Airo Clean"). The decision to sell Maris was based on the Company's lack
of adequate working capital to support Maris' operations. Although the
transaction closed on June 8, 1998, it was effective as of June 1, 1998.

         The purchase price for the assets of Maris (the "Purchase Price") was
determined as a result of arm's length negotiations with the Buyer. Neither the
Buyer nor its principals are affiliated with the Company and neither the Company
nor any of its current executive officers, directors or controlling persons has
any ownership interest in the Buyer.

         The Purchase Price consists of three components, as follows:

         (a) a fixed payment of $1,100,000 paid in cash at Closing;

         (b) An amount (the "Asset Amount") which is the amount by which (i)
fixed assets, accounts receivable, work-in-process and inventory of Maris at
Closing exceeded (ii) accounts payable of Maris at Closing and liabilities
assumed by the Buyer at Closing. Based on a final Closing balance sheet prepared
by the Company and delivered to the Buyer subsequent to Closing, the Company has
determined this amount to be approximately $1,826,000. Approximately $932,000
was paid to the Company in cash at Closing, based on an estimated Closing
balance sheet and estimated Closing adjustments. Approximately $144,000 is due
to the Company based on the final Closing balance sheet and Final Closing
adjustments. $750,000 of the Asset Amount will be retained by the Buyer as a
Deferred Payment ("Deferred Payment"). The Deferred Payment will be paid as
follows: The Buyer was assigned approximately $3,335,000 of Maris' accounts
receivable. When all but $750,000 of these accounts receivable have been
collected by the Seller, the next $250,000 of these accounts receivable
collected by the Buyer will be paid to the Company to reduce the balance of the
Deferred Payment. Thereafter, the remaining amounts of the Deferred Payment, if
paid, will be paid in accordance with paragraph (c) below.

         (c) The third element of the purchase price are contingent payments
("Contingent Payments") of up to $500,000 which are based on the performance of
Maris' business for the calendar year ending December 31, 1998. The Contingent
Payments will be determined as follows:

             (i) Contingent Payments to be made based upon Maris' 1998 gross
revenue ("Gross Revenue") are as follows, provided that no Contingent Payment
will be made based upon Gross Revenue unless Maris achieves a minimum 1998 gross
margin of 22%:

                 (A) If Gross Revenue is $13.5 million or more, $200,000;

                                       1

<PAGE>

                 (B) If Gross Revenue is between $11.5 and $13.5 million, an
amount equal to $200,000 multiplied by a fraction the numerator of which is the
Gross Revenue in excess of $11.5 million, and the denominator of which is
$2,000,000;

                 (C) If Gross Revenue is below $11.5 million, no payment.

             (ii) Contingent Payments to be made based upon Maris' 1998 gross
margins ("Gross Margins") are as follows, provided that no Contingent Payment
will be made based upon Gross Margins unless Maris achieves a minimum Gross
Revenue of $11.5 million:

                 (A) If Gross Margins are 24% or more, $200,000;

                 (B) If Gross Margins are between 22% and 24%, an amount equal
to $200,000 multiplied by a fraction the numerator of which is the Gross Margins
achieved in excess of 22%, and the denominator of which is 2%;

                 (C) If Gross Margins are below 22%, no payment.

             (iii) Contingent Payments to be made based upon Maris' 1998
bookings ("Bookings") are as follows, provided that no Contingent Payment will
be made based upon Bookings unless Maris achieves a minimum Gross Margin of 22%:

                 (A) If Bookings are $13.5 million or more, $100,000;

                 (B) If Bookings are between $12.5 million and $13.5 million, an
amount equal to $100,000 multiplied by a fraction the numerator of which is the
Bookings generated in excess of $12.5 million, and the denominator of which is
$1,000,000;

                 (C) If Bookings are below $12.5 million, no payment.

             (iv) On or about January 15, 1999, the Buyer will prepare an
estimate of the Contingent Payments due to the Company. If the Company is due
any Contingent Payment based upon the Buyer's estimate, the Buyer will pay from
the remaining amount of the Deferred Payment an amount which will reduce the
aggregate of the Deferred Payment and the Contingent Payments to $500,000. On
March 31, 1999, the Buyer will decide whether to continue to pay the balance of
the Deferred Payments from collections of accounts receivable assigned by Maris
as and when collected, or to pay the difference between the remaining amount of
the Deferred Payment and the amount of the accounts receivable and reassign the
accounts receivable to the Company.

         Subsequent to Closing, the Company has delivered its final Closing
balance sheet to the Buyer together with a schedule of final Closing
adjustments, resulting in cash due to the Company of approximately $144,000. The
Buyer has a period of twenty-five days after the Company's delivery of its final
Closing balance sheet to pay the adjusted amount. If the Buyer does not agree to

                                       2
<PAGE>

the Company's calculation of the Asset Amount, the Buyer is entitled to engage
an accounting firm to perform an audit within 180 days after the Company has
delivered its final Closing balance sheet, and to pay a final amount based on
the Asset Amount determined by that audit..

         The proceeds received by the Company at Closing were used primarily to
repay its outstanding institutional loans.

         The Deferred Payments may be reduced by an aggregate of $50,000 if two
distributorship agreements held by Maris are not transferred to the Buyer within
60 days. The Company believes both of these agreements will be transferred in
the required time period, but as this is within the discretion of a third party,
there can be no assurance that this agreement will be transferred. Deferred
Payments will be reduced by the amount of commissions paid by the Buyer to the
Company's sales staff for jobs not completed prior to Closing. The Buyer will
pay the entire commission as the proceeds are received from the customer, and
then deduct from the Deferred Payment a portion of the commissions attributable
to the percentage of the job completed prior to June 1, 1998. The Company
estimates that these commissions will aggregate approximately $70,000. There is
no assurance that the amount of the commissions will not be greater. Finally,
the Deferred Payments will be reduced by the amount by which the cost overruns
on one particular job which has been transferred to the Buyer exceed the cost
overruns estimated by the Company prior to Closing. The Company cannot estimate
the amount of potential cost overruns at this time.

         Under an Interim Services Agreement executed by the Company at Closing,
the Company is required to provide STG with the use of the portion of the
Company's headquarters facility in Exton, Pennsylvania previously used by Maris
(including rights to use Common areas), and the right to use the telephone and
other equipment, facilities and general support services at that location. The
Company is also required to provide transitional accounting, management and
financial services to STG, including the services of the Company's president
George E. Mitchell and its chief financial officer, Frederick Franks. These
services are to be provided on an as-needed basis. Immediately following
Closing, Mr. Franks was devoting a substantial amount of time to assisting the
Buyer with the financial aspects of the business sold to the Buyer. STG will pay
the Company approximately $11,000 per month for use of the space. STG will pay
the Company $5,000 in the first month, and $1,000 in each month thereafter, for
the financial and management services. For other services and facilities, STG
will pay the direct cost of the services or facilities used by STG, based on the
Company's actual cost or an allocation of the Company's total cost, and in some
cases the Company and STG will share costs equally. The term of the Interim
Services Agreement expires on April 30, 1999. STG has the option, however, to
terminate the accounting, financial and management services (but not the use and
payment for the space) at any time on 15 days' notice. The Company's failure to
comply with the Interim Services Agreement would affect the Company's ability to
collect the Deferred payment.

                                       3
<PAGE>

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

         (b)  Pro Forma Financial Statements

              The Pro Forma financial statements required pursuant to Article 11
              of Regulation S-X will be filed by amendment to this initial
              report on Form 8-K, no later than 60 days after the date that this
              Report must be filed.

         (c)  Exhibits

         2.1  Asset Purchase and Sale Agreement dated June 8, 1998 by and
              between Maris Equipment Company, Inc., as Seller and Security
              Technologies Group, Inc., as Buyer, effective June 1, 1998.

         2.2  Interim Services Agreement dated June 8, 1998, by and among
              Maris Equipment Company, Inc., Core Technologies
              (Pennsylvania), Inc. and Security Technologies Group, Inc.

         20.1 Press Release dated June 8, 1998.


                                    SIGNATURE


         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.

                                      CORE TECHNOLOGIES (PENNSYLVANIA), INC.



                                      By: /s/ George E. Mitchell
                                          -------------------------------------
                                          George E. Mitchell, President and
                                          Chief Executive Officer

                                        4
<PAGE>

                                  EXHIBIT INDEX


2.1      Asset Purchase and Sale Agreement dated June 8, 1998, by and between
         Maris Equipment Company, Inc., as Seller and Security Technologies
         Group, Inc., as Buyer, effective June 1, 1998.

2.2      Interim  Services  Agreement dated June 8, 1998, by and among Maris
         Equipment Company, Inc., Core  Technologies (Pennsylvania), Inc. and
         Security Technologies Group, Inc.

20.1     Press Release dated June 8, 1998.

















                                       5


<PAGE>
                        ASSET PURCHASE AND SALE AGREEMENT

                                 by and between

                          MARIS EQUIPMENT COMPANY, INC.

                                    as Seller

                                       and

                        SECURITY TECHNOLOGIES GROUP, INC.

                                    as Buyer


                             Effective June 1, 1998


<PAGE>



                                TABLE OF CONTENTS
<TABLE>
<CAPTION>

<S>      <C>      <C>                                                                                                    <C>
1.       PURCHASE PRICE AND TERMS.........................................................................................1
         ------------------------                                                                                          
         1.1      Fixed Payment...........................................................................................1
         1.2      Asset Amount............................................................................................1
         1.3      Price Adjustment........................................................................................1
         1.4      Contingent Payments.....................................................................................2


2.       PURCHASE AND SALE OF ASSETS......................................................................................2
         ---------------------------
         2.1      Transferred Assets......................................................................................2
         2.2      Excluded Assets.........................................................................................5


3.       LIABILITIES......................................................................................................5
         -----------                                                                                                       
         3.1      Accounts Payable........................................................................................6
         3.2      Obligations under Assigned Contracts....................................................................6
         3.3      Warranty Obligations....................................................................................6
         3.4      Miscellaneous...........................................................................................6


4.       GENERAL REPRESENTATIONS, WARRANTIES AND COVENANTS OF SELLER......................................................6
         -----------------------------------------------------------                                                       
         4.1      Organization; Standing..................................................................................6
         4.2      Authority; Binding Obligation...........................................................................7
         4.3      No Violation............................................................................................7
         4.4      Licenses and Permits....................................................................................7
         4.5      Financial Statements....................................................................................8
         4.6      Records.................................................................................................8
         4.7      Absence of Certain Changes..............................................................................9
         4.8      Title to and Condition of the Assets....................................................................9
         4.9      Customers and Suppliers................................................................................10
         4.10     Employees - Consultants................................................................................10
         4.11     Litigation.............................................................................................10
         4.12     Contracts..............................................................................................11
         4.13     No Bankruptcy..........................................................................................11
         4.14     Tax Returns............................................................................................11
         4.15     Environmental Liability................................................................................11
         4.16     Compliance With Zoning, Planning and Safety Regulations................................................12
         4.17     Employment and Employment Practices....................................................................12
         4.18     Receivables............................................................................................12
         4.19     Inventory and Supplies.................................................................................12
         4.20     Intellectual Property..................................................................................12
         4.21     Insurance..............................................................................................13
         4.22     Employee Benefit Plans.................................................................................13
         4.23     Warranty Claims........................................................................................14
         4.24     Computer Programs......................................................................................14
         4.25     No Finder's Fee........................................................................................15
         4.26     Conduct of Business of Seller..........................................................................15
         4.27     Full Disclosure........................................................................................15
         4.28     No Other Representations or Warranties.................................................................16
</TABLE>

                                       i
<PAGE>

<TABLE>
<CAPTION>

<S>      <C>      <C>                                                                                                   <C>
5.       REPRESENTATIONS, WARRANTIES AND COVENANTS OF BUYER..............................................................16
         --------------------------------------------------                                                                
         5.1      Good Standing; Organization............................................................................16
         5.2      Authority; Binding Obligation..........................................................................16
         5.3      Governmental Consents..................................................................................16
         5.4      Employment Offers......................................................................................16
         5.5      No Finder's Fee........................................................................................17
         5.6      Knowledge; No Reliance.................................................................................17
         5.7      Conduct of Business by Buyer...........................................................................17

6.       CONDITIONS PRECEDENT TO BUYER'S PERFORMANCE.....................................................................17
         -------------------------------------------                                                                       
         6.1      Representations and Warranties True....................................................................17
         6.2      Covenants and Agreements Performed.....................................................................17
         6.3      Financing..............................................................................................18
         6.4      Approval of Counsel to Buyer...........................................................................18
         6.5      Business Plan..........................................................................................18
         6.6      Due Diligence..........................................................................................18
         6.7      Interim Services and Consulting........................................................................18
         6.8      Guaranty...............................................................................................18
         6.9      Legal Proceedings......................................................................................18
         6.10     Consents...............................................................................................19

7.       CONDITIONS PRECEDENT TO SELLER'S PERFORMANCE....................................................................19
         --------------------------------------------                                                                      
         7.1      Representations and Warranties True....................................................................19
         7.2      Covenants and Agreements Performed.....................................................................19
         7.3      Approval of Counsel to Seller..........................................................................19
         7.4      Legal Proceedings......................................................................................19
         7.5      Consents...............................................................................................19

8.       RISK OF LOSS....................................................................................................19
         ------------

9.       PRICE ALLOCATION................................................................................................20
         ----------------

10.      TAX REPORTING...................................................................................................20
         -------------

11.      PRORATION.......................................................................................................20
         ---------

12.      CLOSING.........................................................................................................20
         12.1     General................................................................................................20
         12.2     Closing Transactions...................................................................................20


13.      EXPENSES OF SALE................................................................................................21
         ----------------
</TABLE>
                                       ii
<PAGE>

<TABLE>
<CAPTION>

<S>      <C>      <C>                                                                                                   <C>
14.      SURVIVAL OF REPRESENTATIONS; INDEMNIFICATION....................................................................21
         --------------------------------------------                                                                      
         14.1     Survival...............................................................................................21
         14.2     Indemnification by Seller..............................................................................21
         14.3     Indemnification by Buyer...............................................................................22
         14.4     Indemnity Threshold; Limitations.......................................................................23

15.      COVENANTS NOT TO COMPETE........................................................................................24
         ------------------------

16.      MISCELLANEOUS...................................................................................................24
         -------------                                                                                                     
         16.1      Notices...............................................................................................24
         16.2      Governing Law.........................................................................................25
         16.3      Succession............................................................................................25
         16.4      Entireties............................................................................................25
         16.5      Severability..........................................................................................25
         16.6      Cooperation...........................................................................................25
         16.7      Paragraph Headings....................................................................................25
         16.8      Press Releases and Public Announcements...............................................................25
         16.9      Personal Jurisdiction.................................................................................25
         16.10     Counterparts..........................................................................................26
         16.11     Remedies - Attorneys' Fees............................................................................26
         16.12     Time..................................................................................................26
</TABLE>

Exhibits:

         A.    Financial Statements 
         B.    Interim Services Agreement
         C.    Guaranty Agreement 
         D.    General Assignment/Bill of Sale
         E.    Opinion of Buyer's Counsel 
         F.    Opinion of Seller's Counsel
         G.    Non-Competition and Confidentiality Agreement

Schedules:

         1.2(a)     Asset Amount
         1.2(b)     Deferred Payment
         1.3        Contingent Payments
         2.1.1      Tangible Personal Property
         2.1.2      Inventory
         2.1.2(A)   Accounts Receivable
         2.1.3      Computer Programs
         2.1.4      Contracts and Agreements
         2.1.6      Goodwill
         2.1.7      Copyrights, etc.
         2.1.8      Insurance Policies
         2.2.3      Other Excluded Property
         3.1        Assumed Accounts Payable
         3.2        Assigned Contracts

                                      iii
<PAGE>

         4.3        No Violation
         4.4        Licenses and Permits
         4.8        Asset Liens and Encumbrances
         4.9        Customers and Suppliers
         4.10       Employees - Consultants
         4.11       Litigation
         4.12       Contracts
         4.14       Unfiled Tax Returns
         4.15       Hazardous Materials
         4.17       Employment Matters
         4.18       Receivables
         4.20       Intellectual Property
         4.21       Insurance
         4.22       Employee Benefit Plans
         4.23       Warranty Claims






                                       iv

<PAGE>

         This Asset Purchase and Sale Agreement (the "Agreement") is made and
entered this 8th day of June, 1998, effective June 1, 1998 (the "Effective
Date"), by and between MARIS EQUIPMENT COMPANY, INC., a Delaware corporation
("Seller"), and SECURITY TECHNOLOGIES GROUP, INC., a New Jersey corporation
("Buyer").

                                R E C I T A L S:
                                ----------------

A.    Seller is a corporation engaged in the business of electronic security
systems integration (the "Business").

B.    Seller wishes to sell to Buyer and Buyer wishes to purchase from Seller,
substantially all of the assets of Seller used in its business under the terms
and subject to the conditions of this Agreement.

      NOW THEREFORE, in consideration of the Recitals, the mutual promises,
covenants, agreements, representations, and warranties contained in this
Agreement, and the monetary consideration described below, the receipt and
sufficiency of which are acknowledged, the parties, intending to be bound, agree
as follows:

      1.   PURCHASE PRICE AND TERMS. Buyer shall purchase the Assets, as defined
in Section 2 below, for the following consideration:

           1.1 Fixed Payment. $1,100,000.00 in cash or other good funds,
      delivered to Seller at Closing, as defined in Section 12.

           1.2 An amount equal to (a) the aggregate book value of the fixed
      assets, plus (b) the book value of accounts receivable and unbilled work
      in process, plus (c) the agreed value of the inventory, minus (d) the
      aggregate book value of the accounts payable and liabilities assumed by
      Buyer pursuant to Section 3 (the "Asset Amount"), all determined as of the
      Effective Date. The procedure for calculating the Asset Amount is set
      forth on Schedule 1.2(a), and will be based upon Seller's Estimated
      Closing Balance Sheet delivered by Seller as required by Section 4.5.
      Seven Hundred Fifty Thousand Dollars ($750,000.00) of the Asset Amount
      shall be deferred (the "Deferred Payment") and shall be subject to the
      Adjustments described in Section 1.3, and shall be paid as set forth on
      Schedule 1.2(a). No portion of the Deferred Payment obligation shall be
      subordinated to any of Buyer's obligations to third parties for borrowed
      money.

           1.3 No later than fifteen (15) days after Buyer's receipt of Seller's
      Closing Balance Sheet delivered as required by Section 4.5, the parties
      will compare the Asset Amount calculated using the Estimated 

                                       1
<PAGE>

     Closing Balance Sheet with the Asset Amount calculated using the Closing
     Balance Sheet. Any refund due to the Buyer, or any additional payment due
     to the Seller as a result of this comparison, shall be paid to the party
     entitled to such payment no later than twenty-five (25) days after delivery
     of the Closing Balance Sheet unless the parties cannot agree on the amount
     payable. In such event, Buyer shall be entitled, upon providing advance
     written notice to the Seller, to engage its accounting firm to perform and
     deliver to Buyer the results of an unqualified audit of the Business, the
     Assets and the Assumed Liabilities as of the Effective Date, on or before
     one hundred eighty (180) days after Seller delivers to Buyer the Closing
     Balance Sheet pursuant to Section 4.5 below (the "Post-Closing Audit"). The
     results of the Post-Closing Audit shall be compared to the Estimated
     Closing Balance Sheet. If the Asset Amount calculated based upon the
     Post-Closing Audit is less than the Asset Amount calculated based upon the
     Estimated Closing Balance Sheet, the difference, together with all other
     amounts owed by the Seller to the Buyer, pursuant to the terms of this
     Agreement shall reduce the Deferred Payment, and shall be retained by the
     Buyer. If any amounts retained by Buyer are due to uncollectible Seller
     Accounts Receivable as defined in Schedule l.2(a), such accounts shall be
     reassigned to Seller. If the Asset Amount calculated based upon the
     Post-Closing Audit is more than the Asset Amount calculated based upon the
     Estimated Closing Balance Sheet, Buyer shall pay the difference to Seller
     upon ten (10) days' written demand. Notwithstanding the foregoing, Buyer
     shall have no obligation to pay any amount of the Deferred Payment to
     Seller if Seller fails to perform its obligations under the Interim
     Services Agreement required by Section 6.7 and such failure is not cured
     within thirty (30) days after written notice of such failure has been
     furnished to Seller.

           1.4 Contingent Payments. Contingent payments not to exceed
      $500,000.00 in the aggregate, payable in the manner and upon the
      conditions set forth in Schedule 1.4.

           2. PURCHASE AND SALE OF ASSETS.

           2.1 Transferred Assets. On the terms and subject to the conditions
      set forth in this Agreement, at the Closing, as defined below, Seller
      shall sell, assign, transfer, and deliver to Buyer, and Buyer shall
      purchase from Seller all of the right, title, and interest of Seller in
      and to all of the assets (the "Assets") of Seller, including but not
      limited to the following, subject to the exclusions set forth in Section
      2.2:

               2.1.1 Tangible Personal Property. All tangible personal property
           including, without limitation, 

                                       2
<PAGE>

          furniture, fixtures, motor vehicles, equipment, machinery, product
          displays, advertising materials, merchandise, tools, supplies and
          computer hardware, software and related equipment, specifically
          described in Schedule 2.1.1. Buyer shall accept all tangible personal
          property in its condition on the Effective Date on an "as is-where is"
          basis.

               2.1.2 Inventory. All inventories of raw materials, supplies,
           parts, work-in-progress, and finished goods of Seller, as described
           on Schedule 2.1.2, all as the same exists on the date of Closing.

               2.1.2(A) Accounts Receivable. All of Seller's accounts
           receivable, as described on Schedule 2.1.2(A).

               2.1.3 Computer Programs. Seller's rights in and to all computer
           programs and systems owned by Seller, in which Seller has any rights
           or which are used in its business, including data bases and their
           contents, operating specifications, magnetic tapes, discs, cards,
           records, files and documentation, and sets of statements or
           instructions, which may be used directly or indirectly in or with a
           computer in order to bring about a certain result (the "Computer
           Programs"). All such Computer Programs are described on Schedule
           2.1.3.

               2.1.4 Contracts and Agreements. Seller's rights under all open
           purchase and sales orders, contracts, agreements, understandings,
           leases, and licenses relating to the operation of the Business,
           including, but not limited to, maintenance and service agreements for
           equipment and agreements to maintain and update Seller's computer
           hardware and software, license and support agreements, premises
           leases for Seller's New York, New York, San Antonio, Texas, and
           Austin, Texas locations (and any related security deposits). All such
           contracts and agreements are described on Schedule 2.1.4.

               2.1.5 Rights in Name. All of Seller's ownership, possession, and
           rights in and to the name "Maris" and any variation thereof.

               2.1.6 Goodwill. The goodwill of the Business and the right to use
           of all telephone lines, telephone numbers, and e-mail addresses used
           in connection with the Business. All such items are described on
           Schedule 2.1.6.

                                       3
<PAGE>

               2.1.7 Copyrights and Similar Property. Seller's ownership of or
           rights under copyrights, licenses, trade names, trademarks, name
           registrations, patents, and other intangible assets, including
           pending applications for same, all of which are specifically
           described in Schedule 2.1.7.

               2.1.8 Insurance Policies. To the fullest extent assignable,
           Seller's insurance policies covering the Business, Seller's
           employees, and the Assets, as described in Schedule 2.1.8. Buyer
           acknowledges that insurance policies owned by Seller's Parent Company
           (as defined in Section 4.1) will not be transferred or assigned to
           Buyer.

               2.1.9 Books and Records. Originals or true copies of all books,
           records, books of account, ledgers, outside auditors' reports and
           workpapers, and other documents and information relating to the
           Business, including, without limitation, accounting books and
           records, tax records, sales literature, customer and supplier lists,
           orders, project data, quotations and bids, credit files,
           correspondence, commission records, catalogues and product
           information of every kind. To the extent the foregoing records are in
           the possession of Seller's Parent, Seller shall provide true copies
           of such records, or immediate access to them upon request. Buyer
           shall afford Seller reasonable access to, and the right to make
           copies of all such records described in this Section 2.1.9 in
           connection with the preparation of its tax returns, the exercise of
           its rights or performance of its obligations in respect of retained
           liabilities, the exercise of its rights or performance of its
           obligations under this Agreement, and other bona fide business
           purposes.

               2.1.10 Actions Regarding Seller's Assets. All choses in action
           and causes of action, claims and rights of recovery or setoff of
           every kind or character arising out of or attributable to any of the
           Assets on or prior to the Closing Date, including deposits, prepaid
           insurance and similar rights, irrespective of the date on which any
           such cause of action, claim or right may arise or accrue.

                                       4
<PAGE>

               2.1.11 Other Assets or Rights. Any other tangible personal
           property located at Seller's places of business as of the Closing
           Date and reasonably necessary for the operation of the Business.

           2.2 Excluded Assets. The Assets shall not include any real property
      or the following items of personal property (collectively, the "Excluded
      Assets"):

               2.2.1 Caltran Contract. All of Seller's accounts receivable or
           other rights related to Seller's Caltran/Gregg Electric contracts
           described as follows:

               Job #04-11-944194/Contract #08368704;

               Job #04-11-944108/Contract #08460724; and,

               Job #04-11-955101/Contract #08369004.

               2.2.2 Cash. All cash or cash equivalents, including marketable
           securities, notes receivable and investments.

               2.2.3 Exton Lease. The Seller's rights and obligations under the
           premises lease for Exton, Pennsylvania except to the extent necessary
           to ensure performance of Seller's obligations under the Interim
           Services Agreement required by Section 6.7.

               2.2.4 Other Excluded Property. All other assets listed in
           Schedule 2.2.4.

               2.2.5 Actions Regarding Excluded Assets. All choses in action and
           causes of action, claims and rights of recovery or setoff of every
           kind or character arising out of or attributable to any of the
           Excluded Assets on or prior to the Closing Date, irrespective of the
           date on which any such cause of action, claim or right may arise or
           accrue.

         3. LIABILITIES. Except for the Assumed Liabilities, as defined below,
Buyer is not assuming or undertaking any liability of Seller. Subject to the
terms, conditions and limitations set forth in Section 14, below, Seller shall
indemnify and hold Buyer harmless from any claims, demands, costs or liabilities
(including attorneys' fees and disbursements) relating to any liability of
Seller other than the Assumed Liabilities. Buyer assumes and agrees to pay,
perform and discharge only the following liabilities of Seller (the "Assumed
Liabilities"), when and if due, and shall hold Seller harmless therefrom:

                                       5
<PAGE>

           3.1 Accounts Payable. Seller's accounts payable listed in Schedule
      3.1 on the condition that Buyer receives satisfactory evidence prior to
      Closing that each past due account creditor with a balance due of
      $40,000.00 or more has agreed that (a) Buyer shall have the right to pay
      each such account payable in no less than four (4) monthly installments
      commencing no sooner than the month in which the Effective Date occurs,
      (b) each installment shall be no greater than 25% of the total account
      payable, (c) no additional interest or other charges will accrue on any
      account payable, provided that all payments on such account payable are
      timely made, (d) Buyer shall have all of Seller's rights to return
      equipment, inventory or other materials for credit, (e) Buyer shall
      continue to be entitled to all of the benefits of the account creditor's
      warranties, and (f) Seller's distributorship/dealership arrangements with
      Westinghouse/Schlage and EST shall remain in force and shall be
      transferred to Buyer. In the event that Seller does not provide evidence
      to the Buyer on or before sixty (60) days after Closing that the
      Westinghouse/Schlage and EST distributorship/dealership arrangements will
      remain in force and will be transferred to Buyer on or before such date,
      the Deferred Payment provided for in Section 1.2 shall be reduced by
      $5,000.00 for Westinghouse/Schlage and $45,000.00 for EST.

           3.2 Obligations under Assigned Contracts. Seller's obligations
      arising and to be performed after the Effective Date under the contracts
      listed in Schedule 3.2 (the "Assigned Contracts"), provided however, that
      Buyer is not assuming any obligation to pay commissions due or to become
      due under the Assigned Contracts base upon percentage of job completion
      through the Effective Date. Seller shall be responsible to pay any and all
      such commissions.

           3.3 Warranty Obligations. All warranty obligations of
      Seller.ligations

           3.4 Miscellaneous. All progress or similar billings in excess of
      costs and customer deposits reflected on and properly reserved in the
      Financial Statements as adjusted by the Closing Balance Sheet or the
      Post-Closing Audit.

         4. GENERAL REPRESENTATIONS, WARRANTIES AND COVENANTS OF SELLER. The
Seller represents, warrants and covenants to Buyer as follows:

           4.1 Organization; Standing. Seller is a corporation duly organized
      and in good standing under the laws of the state of Delaware and (a) has
      all requisite corporate power and authority to carry on its business as
      now conducted, (b) has all governmental and other authorizations,
      licenses, or permits necessary to carry on its business as now 

                                       6
<PAGE>

     conducted, (c) except for Seller's Parent Company, has no subsidiaries or
     affiliates and owns no security or similar interests in any corporation or
     other entity, (d) has delivered to Buyer complete and correct copies of its
     Certificate of Incorporation and Bylaws as currently in effect, and (e)
     that it and its agents executing this Agreement have corporate and legal
     authority to enter into and consummate the transaction contemplated by this
     Agreement. Seller is a 100%-owned subsidiary of Core Technologies, Inc.
     (Pennsylvania), a Delaware corporation (the "Seller's Parent Company").

           4.2 Authority; Binding Obligation. Seller has taken all necessary
      corporate action to authorize the execution and performance of this
      Agreement by Seller. This Agreement, and each document executed by Seller
      in connection herewith, constitute the valid and binding obligations of
      Seller, enforceable in accordance with its terms, subject only to
      applicable bankruptcy, insolvency, and other laws affecting the rights of
      creditors generally, and the discretion of the courts in granting
      equitable remedies.

           4.3 No Violation. Except as set forth on Schedule 4.3, the execution,
      delivery, and performance of this Agreement and the consummation of the
      transactions contemplated hereby by Seller will not conflict with or
      result in a breach of any provision of or default under, or give rise to
      any right of termination, cancellation or acceleration under the terms of,
      as the case may be, (a) Seller's Certificate of Incorporation or Bylaws;
      (b) any mortgage, lien, lease, note, agreement, contract, commitment,
      license, permit or other instrument to which Seller is a party, or by
      which any of its Assets is bound, (c) any law, rule or regulation, or (d)
      any judgment, order, writ, injunction or decree of any court,
      administrative agency or governmental body, domestic or foreign, nor is
      Seller aware of any violation of the above.

           4.4 Licenses and Permits. Seller has the licenses, permits, and
      authorizations shown on Schedule 4.4 and all governmental licenses,
      permits, and authorizations (federal, state and local) necessary to
      conduct its business, including all state authorizations to transact
      business as a foreign corporation, and such licenses or permits are in
      full force and effect, no violations are or have been recorded in respect
      of any of such licenses or permits, and no proceeding is pending or, to
      the best of Seller's knowledge, threatened looking toward the revocation
      or limitation of any of such licenses or permits and Seller has complied
      in all material respects with the antitrust laws as they relate to the
      purchase, distribution and sale of its products and services, 

                                       7
<PAGE>

     and with all other material laws, rules, regulations and orders applicable
     to its business.

           4.5 Financial Statements. Seller has delivered to Buyer accurate and
      complete copies of Seller's audited balance sheet as of December 31, 1997,
      (as reflected on Seller's Parent Company's audited consolidated and
      consolidating financial statements) and the related audited statements of
      income, stockholder equity and cash flows for the year then ended, and the
      notes and schedules thereto, together with the unqualified report thereon
      of KPMG Peat Marwick, certified public accountants (the "Audited Financial
      Statements") and Seller's unaudited balance sheet as of March 31, 1998
      (the "Latest Balance Sheet"), and the related unaudited statements of
      income, stockholder equity and cash flows for the three-month period then
      ended (the "Unaudited Financial Statements"), certified by Seller's chief
      financial officer, (collectively the "Financial Statements"), copies of
      which are attached hereto as Exhibit A. The Financial Statements (a)
      represent actual bona fide transactions, (b) have been prepared from the
      books and records of Seller in conformity with generally accepted
      accounting principles in the United States, and (c) accurately,
      completely, and fairly present, in all material respects, the financial
      position of Seller as of the respective dates thereof and the results of
      operations and cash flows for the periods then ended, subject to year-end
      adjustments, which will not be material in the aggregate. The statements
      of income included in the Financial Statements do not contain any items of
      special or nonrecurring income or any other income not earned in the
      ordinary course of business except as expressly specified therein, and
      include all adjustments, which consist only of normal recurring accruals,
      necessary for such fair presentation. All financial projections,
      forecasts, and other forward looking information provided by Seller to
      Buyer were, as of their respective dates, prepared in good faith and on
      the basis that Seller believed to be reasonable. Seller also shall deliver
      at Closing an estimated balance sheet (the "Estimated Closing Balance
      Sheet") as of the Effective Date, and shall provide to Buyer a final
      unaudited balance sheet and related statements of income, stockholder
      equity and cash flows as of the Effective Closing Date no later than
      thirty (30) days after Closing ("Closing Balance Sheet").

           4.6 Records. All of Seller's accounts, books, ledgers, financial and
      other records of any kind ("Records") (a) have been fully, properly and
      accurately maintained to a standard appropriate for such Records, (b) are
      in the possession of Seller, (c) do not contain or reflect any material
      inaccuracies or discrepancies, and (d) provide a 

                                       8
<PAGE>

     fair and accurate representation of Seller's business in all material
     respects.

           4.7 Absence of Certain Changes. Since the date of the Latest Balance
      Sheet there has not been (a) any sale, purchase, transfer, or distribution
      of any material asset, or any other transaction, except in the regular
      course of business, or except for distributions of cash from bank accounts
      which do not have a material adverse effect on Seller's ability to
      continue operating its business, and which do not and will not impair
      Seller's ability to deliver to Buyer the Assets required by Section 2
      above, (b) any increase in the compensation payable or to become payable
      by Seller to any of its officers, employees, or agents or any bonus
      payment or arrangement made to or with any officers, employees, or agents,
      (c) any mortgage, pledge or other voluntary encumbrance of any asset of
      Seller, (d) any cancellation of debt or waiver or release of any right or
      claim of Seller, except in the ordinary course of business, or (e) any
      labor dispute, or any event or condition of any character, materially and
      adversely affecting Seller's business or prospects. To the best of
      Seller's knowledge after investigation and diligent inquiry, since the
      date of the Latest Balance Sheet there has not been (i) any material
      adverse change in Seller's financial condition, Assets, liabilities or the
      Business, (ii) any obligation or liability incurred by Seller except in
      the ordinary course of business, or (iii) any damage, destruction or loss,
      whether or not covered by insurance, materially affecting Seller's
      financial condition, Assets, or business prospects. To the best of
      Seller's knowledge after investigation and diligent inquiry, Seller has
      disclosed to Buyer all other events or conditions of any character that
      have or could reasonably be expected to have a material adverse effect on
      its condition, Business, Assets, or prospects. From the date of this
      Agreement until and through Closing, Seller will carry on its business and
      activities diligently and in substantially the same manner as it has
      previously, with no material changes.

           4.8 Title to and Condition of the Assets. Seller has good and
      marketable title to all of its Assets being sold under this Agreement, all
      free and clear of all liens, pledges, charges, interests, encumbrances or
      title retention agreements of any kind or nature, except as set forth in
      Schedule 4.8. Except as set forth in Schedule 4.8, the properties owned,
      leased or used by Seller, are (a) to the best of Seller's knowledge, after
      diligent investigation, in the case of tangible assets and properties, in
      good operating condition and repair (ordinary wear and tear excepted) and
      have been maintained in accordance with industry practice, and (b)
      suitable for the purposes used, and adequate for the normal operation of
      the Business as presently conducted. 

                                       9
<PAGE>

     Seller does not have any existing or contingent liabilities in respect of
     any properties previously occupied by it or in which it owned or held any
     interest, including, without limitation, leasehold premises assigned or
     otherwise disposed of.

           4.9 Customers and Suppliers. Schedule 4.9 contains a true and
      complete list of Seller's customers and suppliers for Seller's fiscal year
      ended December 31, 1997, and for the period ending on the Effective Date.
      To the best of Seller's knowledge, no customer and no such supplier has
      given Seller any indication of its desire to cancel or otherwise terminate
      or materially alter its relationship with Seller. Seller will use all
      reasonable efforts to preserve the present relationship with suppliers,
      customers, and others having business relationships with Seller prior to
      Closing. Seller's employees will use all reasonable efforts to preserve
      the present relationship with suppliers, customers, and others having
      business relationships with Seller during any time they are employed by or
      in a consulting relationship with Buyer.

           4.10 Employees - Consultants. Attached as Schedule 4.10 is a true and
      complete list of Seller's current employees and consultants, including
      their names, addresses, telephone numbers, job descriptions, and
      compensation arrangements. Any employees employed, or consultants
      retained, pursuant to a written contract, covered by any collective
      bargaining agreement or who are members of any labor union or are
      represented by any collective bargaining agent are identified on Schedule
      4.10 and copies of the current contracts or bargaining agreements have
      been furnished to Buyer. Except as set forth in Schedule 4.10, to the best
      of Seller's knowledge, no employee or consultant, who is material to the
      operation of the Business, has given notice or other indication to Seller
      of the desire or intent to terminate employment or consultation with
      Seller.

           4.11 Litgation. Except as set forth on Schedule 4.11, there is no:
      (a) action, suit, claim, proceeding, or investigation pending of which
      Seller has received notice, or, to the best of Seller's knowledge,
      threatened against or affecting Seller or any of the Assets to be
      transferred, or before any governmental department, commission, board,
      bureau, agency, or instrumentality, domestic or foreign, or (b)
      governmental investigation or inquiry pending or threatened against or
      affecting Seller, and to the best of Seller's knowledge, there is no basis
      for any of the foregoing which could reasonably be expected to give rise
      thereto. Except as set forth on Schedule 4.11, each of the claims,
      actions, suits, proceedings and investigations listed on Schedule 4.11 has
      been reported to the proper insurance carrier in accordance with the
      applicable insurance policy, 

                                       10
<PAGE>

     if any, and as necessary to ensure coverage thereof and has been accepted
     for coverage by the applicable insurer.

           4.12 Contracts. Schedule 4.12 contains a list of every material
      agreement, contract, lease, commitment, note, arrangement or understanding
      (the "Contracts") to which Seller is a party or by which Seller is bound
      and pertaining in any manner to any of the Assets. Each Contract is valid,
      in full force and effect, and enforceable in accordance with its terms.
      Seller is not aware of any event that would give rise to a breach or
      default under any of the Contracts. There is no outstanding notice of
      default, breach, cancellation, or termination in connection with any of
      the Contracts, and no other party has asserted any claims arising out of
      or in connection with the Contracts. Correct and complete copies of the
      Contracts have been furnished to Buyer. Seller expressly warrants to Buyer
      that the gross profit to be realized on the Boston Control Tunnel contract
      will be no less than $51,468.00 (the "Boston Tunnel Profit"), as such
      amount is adjusted on Seller's work in process report for the period
      ending on the Effective Date, which report shall be delivered to Buyer at
      Closing. If the actual gross profit on the Boston Control Tunnel contract
      is less than the Boston Tunnel Profit, the Deferred Payment shall be
      reduced by the difference without regard for the limitations set forth in
      Section 14.4.

           4.13 No Bankruptcy. Neither Seller nor Seller's Parent Company have
      filed and neither will within 180 days after closing file for any form of
      relief under the United States Bankruptcy Code or analogous state laws,
      nor has either made a general assignment or composition with respect to
      creditors. No order, execution or other process has been levied against
      Seller in any action taken to repossess goods in any material amount. No
      steps have been taken for the appointment of a receiver of any part of
      Seller's property.

           4.14 Tax Returns. Except as set forth on Schedule 4.14, Seller has
      filed all tax returns and reports, each of which is accurate, required to
      be filed by it with all taxing authorities to which it is subject and paid
      or provided for all taxes shown to be due on such returns or otherwise.
      Seller has no knowledge of any deficiency or additional tax or charge
      proposed to be assessed against it or its Assets. Seller has not executed
      any agreements for extension of time for the assessment or payment of any
      tax, nor is Seller aware of any action, pending or contemplated, by any
      taxing authority to collect any outstanding taxes due.

           4.15 Environmental Liability. To the best of Seller's knowledge,
      Seller has no responsibility for the use, discharge, clean-up, abatement
      or other responsibility under 

                                       11
<PAGE>

     any applicable federal, state or local environmental protection statute or
     regulation. Except as set forth on Schedule 4.15, Seller does not use and
     has never used or stored hazardous or environmentally regulated substances
     in the conduct of its Business except in accordance with all applicable
     laws, rules and regulations.

           4.16 Compliance With Zoning, Planning and Safety Regulations. The use
      of all of the properties in or on which Seller conducts the Business, and
      all machinery and equipment therein and the conduct of any business
      therein complies in all material respects with all applicable zoning,
      planning and safety statutes, regulations and rules.

           4.17 Employment and Employment Practices. Except as set forth on
      Schedule 4.17, Seller is in material compliance with all applicable
      material laws respecting employment and employment practices, terms and
      conditions of employment, wages and hours and nondiscrimination in
      employment and is not engaged in any prohibited unfair labor practice.
      There is no labor strike, dispute, slowdown or work stoppage actually
      pending or, to the best of Seller's knowledge, threatened against or
      involving Seller, nor has Seller experienced any work stoppage or any
      other material labor dispute during the last three years.

           4.18 Receivables. Except as set forth on Schedule 4.18, all accounts
      receivable being transferred to Buyer have arisen in the ordinary course
      of business, represent valid obligations to Seller, and, subject only to
      consistently recorded reserves or provisions for bad or doubtful debts,
      have been collected or are presently collectible in the aggregate recorded
      amounts thereof in accordance with their terms. Seller shall have no
      indemnification liability to the Buyer or any other person for breach of
      the warranties and representations contained in this Section 4.18 if and
      to the extent that the Deferred Payment contemplated by Section 3 has been
      reduced as a result of any such breach.

           4.19 Inventory and Supplies. Seller's inventory and supplies to be
      transferred to Buyer are in usable or saleable condition in the ordinary
      course of business, subject only to reserves for obsolescence reflected on
      the Latest Balance Sheet or in Seller's other books and records.

           4.20 Intellectual Property. Except as set forth on Schedule 4.20,
      Seller has no patents, patent rights, patent applications, licenses of
      intellectual property as licensee, trademarks, trademark rights, trade
      names, trade name rights, service mark rights, copyrights, unpatented
      discoveries, processes, or inventions or similar rights (collectively the
      "Intellectual Property"), nor requires any such rights in 

                                       12
<PAGE>

     order to conduct its business. Unless otherwise indicated on Schedule 4.20,
     Seller owns the entire right, title, and interest in and to the
     Intellectual Property and technology used in its business (including,
     without limitation, the exclusive right to use and license same) and each
     item constituting part of the Intellectual Property which is owned by
     Seller, has been, to the extent indicated on Schedule 4.20, duly registered
     with, filed in or issued by the trademark or patent office or such other
     governmental entity, domestic or foreign, as are indicated on Schedule
     4.20, and such registrations, filings and issuances remain in full force
     and effect. Except as stated on Schedule 4.20, there are no pending or, to
     the best of Seller's knowledge, threatened proceedings or litigation or
     other adverse claims affecting or with respect to the Intellectual
     Property. Seller's rights to its proprietary software are free and clear of
     any claims of any employees, consultants, or outside programmers. Schedule
     4.20 lists all notices of or claims currently pending or received by Seller
     during the past two years that assert infringement, contributory
     infringement, inducement to infringe, misappropriation or breach by Seller
     of any domestic or foreign patent, patent application, patent, software or
     know-how license, trade name, trademark, copyright, service mark, trademark
     registration or application, service mark registration or application,
     copyright registration or application, trade secret or other confidential
     proprietary information. Except as disclosed on Schedule 4.20, to the best
     of Seller's knowledge after due investigation and inquiry, Seller is not
     infringing, or otherwise acting adversely to, the right of any person under
     or in respect to any patent, license, trademark, trade name, service mark,
     copyright or similar intangible right.

           4.21 Insurance. Seller's properties and Business are and continuously
      have been insured by licensed insurers. Seller will cooperate, to the
      extent possible and subject to Buyer's acknowledgement in Section 2.1.8,
      to assure that the insurance coverage provided by such insurance policies
      will not in any respect be affected by, and will not terminate or lapse
      merely by reason of, the execution and delivery of this Agreement or the
      consummation of the transactions described herein. All such policies,
      including the amounts and terms of coverage and an indication of whether
      they are assignable are set forth on Schedule 4.21. Copies of such
      policies have been furnished to Buyer. To the extent such policies are not
      assignable, Seller will cooperate and assist Buyer in the transition from
      the existing policies to new policies secured by Buyer.

           4.22 Employee Benefit Plans. Except as listed on Schedule 4.22,
      Seller has not adopted any retirement, profit sharing, deferred
      compensation, stock option, bonus, group or 

                                       13
<PAGE>

     individual medical, dental, health, life insurance, survival benefit, or
     similar plan or arrangement covering all or any of its employees. Copies of
     such plans, identified on Schedule 4.22, have been furnished to Buyer. Each
     of the arrangements set forth on Schedule 4.22 is referred to as an
     "Employee Benefit Plan." Each Employee Benefit Plan is and has been
     maintained and operated in compliance in all material respects with the
     terms of the respective plans and with the requirements imposed by
     applicable law. Except as set forth on Schedule 4.22, there is no pending
     or, to the best of Seller's knowledge after diligent investigation,
     threatened legal action, proceeding, or investigation, other than routine
     claims for benefits, concerning any Employee Benefit Plan or any fiduciary
     or service provider and to the best of Seller's knowledge, there is no
     basis for any such legal action or proceeding. Except as set forth on
     Schedule 4.22, there is no liability, contingent or otherwise, for any
     Employee Benefit Plan other than insurance premiums satisfied in due
     course. Each Employee Benefit Plan for which a separate fund is or is
     required to be maintained, has been fully funded as required by the terms
     of the Plan as of the end of the most recently completed plan year. The
     execution of this Agreement and the consummation of the transactions
     contemplated will not result in (a) any payment (whether severance pay or
     otherwise) becoming due from any Employee Benefit Plan, or result in the
     vesting, acceleration of payment, or increases in the amount of benefit, or
     (b) the employees, officers, and/or directors of Buyer, as the owner of the
     business of Seller, becoming eligible to receive benefits under such
     Employee Benefit Plans pursuant to the terms of such Plans or under
     applicable law.

           4.23 Warranty Claims. There are no unresolved claims or claims
      asserted or, to the best of Seller's knowledge, threatened by Seller's
      customers for breach of express or implied warranty, misrepresentation, or
      any other claims based on a defect in or failure of services or products
      sold or leased by Seller, which, as of the date of Closing, exceed
      $60,000.00 in the aggregate. All pending and, to the best of Seller's
      knowledge, threatened warranty claims are described on Schedule 4.23.

           4.24 Computer Programs. Seller will provide reasonable assistance
      upon request by Buyer for the purpose of determining whether all computer
      or computer related hardware or software transferred as part of the Assets
      (the "Computer System") is millennium compliant. For purposes of this
      section "millennium compliant" means that the Computer System (a) allows
      for the input of all dates in a four-digit format; (b) provides date
      output in a four-digit format; (c) accommodates same-century and
      multi-century date related formulas and calculations (including leap year
      calculations); 

                                       14
<PAGE>

     (d) function accurately and without interruption before, during, and after
     January 1, 2000, and (e) responds to two-digit date input in a way that
     resolves any ambiguity as to century.

           4.25 No Finder's Fee. No finder, broker, agent or other intermediary
      has acted for or on behalf of Seller in connection with the negotiation or
      consummation of the transactions contemplated hereby.

           4.26 Conduct of Business of Seller. The Seller's principal business
      is not the sale or rental of merchandise from stock. During the period
      from the date of this Agreement to the Closing Date, or the date, if any,
      on which this Agreement is earlier terminated, Seller shall conduct its
      Business only according to its ordinary and usual course and use its best
      efforts to preserve intact its business organization, keep available the
      services of its officers, employees, and consultants, and to maintain
      satisfactory relationships with licensors, suppliers, distributors,
      lessees, customers and others having business relationships with it.
      Except as may be approved in advance by Buyer, or as is otherwise
      permitted or required by this Agreement, Seller will refrain from making
      any pension, retirement or insurance payment or arrangement, from agreeing
      to pay any bonus to accrue after the Closing Date to or with any such
      persons except those that may have already been accrued, and from entering
      into any contract or commitment, or buy or sell inventory or equipment,
      except in the ordinary course of business. During the period from the date
      of this Agreement to the Closing Date, Buyer and Seller shall confer on a
      regular and frequent basis regarding material operational matters and to
      report the general status of ongoing operations. Seller shall notify Buyer
      of any unexpected emergency or other change in the normal course of its
      business or in the operation of its properties and of any governmental
      complaints, investigations or hearings (or communications indicating that
      the same may be contemplated), adjudicatory proceedings, budget meetings
      or submissions involving any material property of Seller, and keep Buyer
      fully informed of such events and permit its representatives prompt access
      to all materials prepared in connection therewith.

           4.27 Full Disclosure. Seller has provided Buyer with full access to
      all Assets, books, accounts, records, and documents of or relating to
      Seller, the Business and its Assets. No representation or warranty of
      Seller contained in this Agreement contains any untrue statement of a
      material fact or omits any material fact necessary to make the statements
      contained herein or therein not false or misleading. There is no fact
      known to Seller that materially 

                                       15
<PAGE>

     or adversely affects or in the future may materially or adversely affect
     the Business, Assets to be transferred, or operations of Seller that has
     not been set forth in this Agreement.

           4.28 No Other Representations or Warranties. Seller has given the
     Buyer, its agents, experts or other representatives full access to the
     Assets and the Assumed Liabilities, and the Buyer has made, or caused to be
     made, such investigations and inspections of the Assets and Assumed
     Liabilities as the Buyer has deemed necessary and, with respect to the
     Assets and Assumed Liabilities, such investigations and inspections are in
     lieu of all warranties and representations of Seller, express or implied,
     except those specifically set forth in this Section 4.

         5. REPRESENTATIONS, WARRANTIES AND COVENANTS OF BUYER. Buyer
represents, covenants and warrants as follows:

           5.1 Good Standing; Organization. Buyer is a corporation duly
     organized, validly existing, and in good standing under the laws of the
     state of New Jersey, and has the power and authority to execute and perform
     this Agreement.

           5.2 Authority; Binding Obligation. Buyer has, by all necessary
     corporate actions, duly authorized the execution and performance of this
     Agreement. This Agreement and each document executed by Buyer in connection
     herewith constitute the valid and binding obligation of Buyer, enforceable
     in accordance with its terms, subject to applicable bankruptcy, insolvency
     and other laws affecting the rights of creditors generally, and the
     discretion of the courts in granting equitable remedies. Upon satisfaction
     of the Conditions Precedent to Buyer's Performance described in Section 6,
     Buyer's execution of this Agreement will not conflict with, result in a
     breach of any provision of, or constitute a default under any contractual
     or other obligation to which Buyer is a party or by which Buyer is bound,
     and will not conflict with any provision of Buyer's Articles of
     Incorporation or Bylaws.

           5.3 Governmental Consents. No consent, approval or authorization of,
     or registration, designation, or filing with any governmental authority,
     federal or other, on the part of Buyer, is required in connection with the
     acquisition of the Assets and the consummation of the transactions
     contemplated by this Agreement.

           5.4 Employment Offers. Buyer may, in its sole discretion, offer one
     or more of Seller's employees the opportunity to become Buyer's employees,
     subject to written employment, non-competition, and non-disclosure
     agreements, 

                                       16
<PAGE>

     at compensation levels consistent with Buyer's policies, all as prescribed
     by Buyer. All employees offered and who accept employment with Buyer shall
     be provided the opportunity to participate in Buyer's standard fringe
     benefit programs, consistent with participation of other similarly situated
     employees of Buyer.

           5.5 No Finder's Fee. No finder, broker, agent or other intermediary
     has acted for or on behalf of Buyer in connection with the negotiation or
     consummation of the transactions contemplated hereby.

           5.6 Knowledge; No Reliance. As a result of the inspections,
     investigations, and examinations heretofore conducted by the Buyer with
     respect to the Assets and the Assumed Liabilities, Buyer acknowledges that
     it possesses such information as it deems necessary to reach an informed
     decision to purchase the Assets and otherwise perform pursuant to the terms
     of this Agreement. Accordingly, the Buyer is not relying upon any
     representations or warranties of any kind whatsoever, whether express or
     implied by operation of law or otherwise, except for those representations
     and warranties specifically set forth in Section 4 of this Agreement. As of
     the date hereof, Buyer has no knowledge of any breach of any of Seller's
     representations, warranties, or covenants contained herein which could give
     rise to a claim for indemnification hereunder.

           5.7 Conduct of Business by Buyer. During the period from the Closing
     Date until the date on which all amounts due from Buyer to Seller for the
     Deferred Payment and the Contingent Payment, if any, have been paid, Buyer
     shall conduct the Business diligently and in good faith, and shall use
     reasonable efforts to avoid taking any action which would diminish the
     revenue, margins, and bookings of the Business.

         6. CONDITIONS PRECEDENT TO BUYER'S PERFORMANCE. The obligation of Buyer
to close the transactions described in this Agreement is subject to the
satisfaction of the following conditions at or before Closing except to the
extent waived in writing by Buyer at Closing:

           6.1 Representations and Warranties True. Except as otherwise
     permitted by this Agreement, all representations and warranties of Seller
     contained herein shall be correct in all material respects on and as of the
     Closing Date as though made at that time.

           6.2 Covenants and Agreements Performed. Seller shall perform or cause
     to be performed, satisfy, and comply with all covenants, agreements, and
     conditions required by this 

                                       17
<PAGE>

     Agreement to be performed or complied with by it on or before Closing.

           6.3 Financing. Buyer shall have obtained financing from its primary
     lender on terms and conditions satisfactory to Buyer.

           6.4 Approval of Counsel to Buyer. All legal matters in connection
     with the consummation of the transactions contemplated hereby and all
     agreements, instruments, and documents delivered in connection therewith
     shall be reasonably satisfactory in form and substance to Lohf, Shaiman &
     Jacobs, P.C., legal counsel to Buyer.

           6.5 Business Plan. Seller shall have delivered to Buyer a detailed
     business plan outlining its business prospects and projections for the
     Business, and individually for each of its office locations, the sales
     methodologies, operating requirements, and capital resources necessary to
     achieve such business prospects and projections. The business plan shall
     cover the 1998 calendar year .

           6.6 Due Diligence. The due diligence review to be conducted by Buyer
     with respect to Seller, and the representations, warranties, covenants, and
     agreements made by Seller in this Agreement, shall have been completed and
     the results thereof shall be reasonably satisfactory to Buyer and its
     counsel. The representations and warranties of Seller shall remain binding
     and enforceable, notwithstanding Buyer's satisfaction with its due
     diligence review, and shall be unaffected by any information actually or
     allegedly discovered, or able to be discovered, during such review.

           6.7 Interim Services and Consulting. Seller and Seller's Parent
     Company shall have executed an interim services agreement to provide
     transitional accounting, management and related services to Buyer,
     including without limitation, the services of George E. Mitchell and
     Frederick Franks on an as needed basis. The Interim Services Agreement
     shall be in the form specified by Exhibit B, and key employees of Seller,
     as determined by Buyer in its sole discretion, shall have entered into
     employment agreements with Buyer in form and substance satisfactory to
     Buyer.

           6.8 Guaranty. Seller's Parent Company shall have executed a guaranty
     agreement in favor of Buyer substantially in the form attached as Exhibit C
     hereto guaranteeing the Seller's performance of its obligations hereunder.

           6.9 Legal Proceedings. No proceeding shall, on the Closing Date, be
     pending or threatened seeking to restrain, prohibit, or obtain damages or
     other relief in connection 

                                       18
<PAGE>

     with this Agreement or the consummation of the transactions contemplated
     hereby.

           6.10 Consents. Buyer shall have obtained all necessary approvals from
     its directors, shareholders, lenders, and state, municipal, and other
     governmental authorities.

         7. CONDITIONS PRECEDENT TO SELLER'S PERFORMANCE. The obligation of
Seller to close the transactions described in this Agreement is subject to the
satisfaction of the following conditions at or before Closing except to the
extent waived in writing by Seller at Closing:

           7.1 Representations and Warranties True. Except as otherwise
     permitted by this Agreement, all representations and warranties of Buyer
     contained herein shall be correct in all material respects on and as of the
     Closing Date as though made at that time.

           7.2 Covenants and Agreements Performed. Buyer shall perform or cause
     to be performed, satisfy, and comply with all covenants, agreements, and
     conditions required by this Agreement to be performed or complied with by
     it on or before Closing.

           7.3 Approval of Counsel to Seller. All legal matters in connection
     with the consummation of the transactions contemplated hereby and all
     agreements, instruments, and documents delivered in connection therewith
     shall be reasonably satisfactory in form and substance to Stevens & Lee,
     P.C., legal counsel to Seller.

           7.4 Legal Proceedings. No proceeding shall, on the Closing Date, be
     pending or threatened seeking to restrain, prohibit, or obtain damages or
     other relief in connection with this Agreement or the consummation of the
     transactions contemplated hereby.

           7.5 Consents. Seller shall have obtained all necessary approvals from
     its directors, shareholders, lenders, and state, municipal, and other
     governmental authorities.

         8. RISK OF LOSS. Seller shall assume all risk of loss, destruction,
damage or other casualty up to the date and time of Closing, other than normal
wear and tear and use in the normal course of business. If the loss, destruction
or damage due to fire or other casualty up to the date and time of closing is
not of such nature as to curtail or interrupt the business, as reasonably
determined by Buyer, the purchase price shall be adjusted to reflect such loss,
destruction or damage and shall be 

                                       19
<PAGE>

subject to the further agreement of the parties, if any, as of the date and time
of Closing.

         9. PRICE ALLOCATION. For purposes of this Agreement, and as required by
the Internal Revenue Code of 1986, as amended, the purchase price shall be
allocated to the Assets in accordance with the fair market value of the Assets
to be purchased. The price allocation shall be in the form of the allocation set
forth on Schedule 9 attached hereto as modified using the same principles,
within 45 business days after the final adjustment of the Asset Price.

         10. TAX REPORTING. The parties agree that they each will report all
aspects of this sale for Internal Revenue Service, state and local sales and use
tax purposes in strict accordance with the allocation provided for in Section 9.
Seller shall pay any and all sales and/or use taxes assessed or assessable as a
result of this Agreement, including but not limited to any taxes or other
charges assessed or assessable under applicable Pennsylvania bulk sale
legislation and regulations.

         11. PRORATION. Personal property taxes and the like shall be prorated
as of the effective date of Closing.

         12. CLOSING.

             12.1 General. Closing of the transfer of Seller's Assets shall take
         place at the offices of Lohf, Shaiman & Jacobs, P.C., 950 South Cherry
         Street, Suite 900, Denver, Colorado 80246, or such other place as the
         parties determine, on June 5, 1998, effective as of June 1, 1998 (the
         "Closing"; the date of such Closing, the "Closing Date"). All actions
         taken at Closing shall be considered to be taken simultaneously and no
         document, agreement or instrument shall be considered to be delivered
         until all items which are to be delivered have been delivered. Each
         party shall take any and all actions reasonably requested by the other,
         and shall cooperate in good faith so as to provide for the transfer of
         the rights, benefits, duties, obligations and liabilities of the
         Business from the Seller to the Buyer as of the Effective Date, as
         provided by this Section 12.1.

             12.2 Closing Transactions. At Closing, the following will
         occur:

                  12.2.1 Seller and Buyer will execute a general assignment,
             bill of sale and assumption substantially in the form attached as
             Exhibit D hereto, whereby Seller conveys, transfers, assigns and
             delivers the Assets to Buyer, and Buyer assumes the Assumed
             Liabilities.

                                       20
<PAGE>

                  12.2.2 Seller shall deliver assignments of its premises
             leases, together with any and all required landlord consents or
             waivers to each such assignment.

                  12.2.3 Seller will execute and/or deliver to Buyer such other
             deeds, bills of sale, assignments, endorsements and other
             instruments of transfer in the form and substance satisfactory to
             Buyer as shall be necessary to vest in Buyer title to the Assets.

                  12.2.4 Seller will deliver to Buyer a certified copy of the
             resolutions adopted by its board of directors and shareholders
             authorizing the execution and performance of this Agreement.

                  12.2.5 Buyer will deliver to Seller, an opinion of Buyer's
             legal counsel, substantially in the form attached as Exhibit E.

                  12.2.6 Seller, Seller's Parent, and Buyer will execute and
             deliver the non-competition and confidentiality agreement required
             by Section 15 and the Interim Services Agreement required by
             Section 6.7.

                  12.2.7 Buyer will pay the purchase price to the extent due at
             Closing as provided in Section 1.

                  12.2.8 Seller will deliver to Buyer, an opinion of Seller's
             legal counsel, substantially in the form attached as Exhibit F.

                  12.2.9 The parties will execute and deliver such other
             documents as may reasonably be required to carry out the intent of
             the transaction contemplated by this Agreement.

         13. EXPENSES OF SALE. Buyer and Seller shall each be responsible for
their own legal and accounting fees and other expenses incident to the Closing
of this transaction.

         14. SURVIVAL OF REPRESENTATIONS; INDEMNIFICATION.

             14.1 Survival. Subject to the terms, conditions, and limitations
         set forth in this Section 14, the representations, warranties and
         covenants of the parties contained in this Agreement or in any
         certificate, instrument, or document delivered pursuant hereto shall
         survive the Closing, regardless of any investigation made by or on
         behalf of any party.

             14.2 Indemnification by Seller. Seller shall defend, indemnify, and
         hold harmless Buyer, each director, officer, 

                                       21
<PAGE>

         employee, or agent of Buyer, its subsidiaries, and each affiliate
         thereof, and their respective heirs, legal representatives, successors,
         and assigns from and against payment of any claim made by any creditor
         or other person or entity (except for a claim for payment of the
         Assumed Liabilities), and any loss, cost or expenses otherwise incurred
         by Buyer, including but not limited to attorneys' fees, costs and
         disbursements, in connection with (a) Seller's Business prior to the
         Closing, (b) the assertion by any third party of any claim relating to
         the Assets arising or incurred prior to the Closing, and (c) any and
         all loss connected with any breach of Seller's warranties or
         obligations hereunder (including claims made under any applicable bulk
         sales laws). In the event of a claim by any creditor or other person or
         entity subject to this section, Buyer shall provide Seller with written
         notice of such claim in the manner set forth in paragraph 16.1 below,
         within ten days after Buyer's receipt of the claim, provided however,
         that failure to provide such notice shall not adversely affect Buyer's
         right to indemnification hereunder subject only to Seller's right to
         claim damages directly and solely attributable to Buyer's failure to
         provide notice. Thereafter, Seller shall have a period of five days
         within which to notify Buyer, in the manner provided for in paragraph
         16.1, that Seller desires to intercede on Buyer's behalf and defend the
         claim at its sole cost (including without limitation, payment of any
         damages awarded or agreed to, interest, penalties, court costs and
         attorneys' fees). If Seller fails to so notify Buyer and to defend the
         claim, Buyer may defend such claim at its cost and maintain an action
         against Seller to recover all damages, interest, penalties, court
         costs, and attorneys' fees incurred.

             14.3 Indemnification by Buyer. Buyer shall defend, indemnify, and
         hold harmless Seller, each director, officer, employee, or agent of
         Seller, its subsidiaries, and each affiliate thereof, and their
         respective heirs, legal representatives, successors, and assigns, from
         and against payment of any claim made by any creditor or other person
         or entity in connection with (a) Buyer's operation of the Business on
         or after the Closing, (b) the assertion by any third party of any claim
         relating to the Assets arising or incurred on or after the Closing, and
         (c) any and all loss connected with any breach of Buyer's warranties or
         obligations hereunder (including obligations in respect of the Assumed
         Liabilities). In the event of a claim by any creditor or other person
         or entity subject to this section, Seller shall provide Buyer with
         written notice of such claim in the manner set forth in paragraph 16.1
         below, within ten days after its receipt of the claim, provided
         however, that failure to provide such notice shall not adversely affect
         Seller's right to indemnification hereunder subject only to 

                                       22
<PAGE>

         Buyer's right to claim damages directly and solely attributable to
         Seller's failure to provide notice. Thereafter, Buyer shall have a
         period of five days within which to notify Seller in the manner
         provided for in paragraph 16.1 that it desires to intercede on Seller's
         behalf and defend the claim at its sole cost (including without
         limitation, payment of any damages awarded or agreed to, interest,
         penalties, court costs and attorneys' fees). If Buyer fails to notify
         Seller and to defend the claim, Seller may defend such claim at its
         cost and maintain an action against Buyer to recover all damages,
         interest, penalties, court costs, and attorneys' fees incurred.

             14.4 Indemnity Threshold; Limitations. Except for claims by the
         Buyer arising under the Non-Competition and Confidentiality Agreement
         and the Guaranty, and the reduction of the Deferred Payment provided
         for in Sections 3.1 and 4.12, the sole and exclusive remedy for all
         claims by the parties hereto (whether or not related to claims by third
         parties) relating to breaches of the warranties, representations, and
         covenants in this Agreement or any related document or any other matter
         otherwise directly or indirectly relating to the transactions herein
         described, shall be an action for indemnity hereunder, which shall be
         governed and limited by this Section 14 regardless or whether such
         claim arises under contract, breach of warranty, tort or under any
         other legal theory. Except for the obligation to pay sales and use tax,
         and other charges provided for in Section 10, for which Seller is 100%
         responsible, no claim for indemnity under this Section 14 shall be
         asserted by or paid to either the Buyer or the Seller unless and until
         the aggregate expense or loss incurred by such party exceeds
         $25,000.00, and then only to the extent that such aggregate expense or
         loss exceeds $25,000.00. There shall be no further monetary limitation
         on claims for indemnity after the aggregate expense or loss to a party
         exceeds $25,000.00. All claims for breach of Seller's warranties must
         be asserted on or before two years after the Effective Date. The
         liability of Seller and Seller's Parent Company for indemnity under
         this Section 14 shall not exceed the Purchase Price described in
         Section 1.1 through 1.4. Upon the occurrence of an event, at any time
         when the full amounts of the Deferred Payment and the Contingent
         Payment provided for in Sections 1.2 and 1.4 have not been paid, which
         event does or may give rise to a claim by the Buyer for indemnification
         under this Section 14, Buyer shall so notify Seller in writing, and the
         parties shall attempt in good faith to evaluate the indemnification
         claim and agree to an appropriate amount to withhold for or set off
         against the Deferred Payment or Contingent Payment. If the parties fail
         to agree on such amount, Buyer shall be entitled to deposit with an
         independent escrow reasonably acceptable to both parties, an amount
         sufficient to satisfy 

                                       23
<PAGE>

         such claim, not to exceed the sum of the then unpaid portion of the
         Deferred Payment and the maximum unpaid amount of the Contingent
         Payments, until the claim is resolved.

         15. COVENANTS NOT TO COMPETE. Neither Seller nor Seller's Parent shall
engage in any business which in any way competes with Buyer's Business,
including the Business acquired hereby, for a period of five years after
Closing. At Closing, Seller and Seller's Parent will execute and deliver to
Buyer a non-competition and confidentiality agreement substantially in the form
attached as Exhibit G (the "Non-Competition and Confidentiality Agreement").

         16. MISCELLANEOUS.

             16.1 Notices. Any notices provided or required under the terms of
         this Agreement shall be effective immediately when provided by verified
         facsimile transmission or personal delivery, or five days after being
         sent by first class mail or internationally recognized courier, and
         addressed as follows:

             If to Seller,

                  Maris Equipment Company, Inc.
                  Attention: Mr. George E. Mitchell
                  110 Summit Drive
                  Exton, Pennsylvania  13941
                  Facsimile:  (610) 524-7434


             with a copy to,

                  Steven M. Tyminski
                  Stevens & Lee, P.C.
                  1275 Drummers Lane
                  P. O. Box 236
                  Wayne, Pennsylvania  19087-0236
                  Facsimile:  (610) 687-1384

             If to Buyer,

                  Security Technologies Group, Inc.
                  Attention:  Mark Landis, CEO
                  150 South Pine Island Road, Suite 100
                  Plantation, Florida  33324
                  Facsimile:  (954) 424-5999

                                       24
<PAGE>

             with a copy to

                  Charles H. Jacobs
                  Lohf, Shaiman & Jacobs, P.C.
                  950 S. Cherry Street, Ste. 900
                  Denver, Colorado  80246
                  Fax: (303) 753-9997


             16.2 Governing Law. THE LAWS OF THE STATE OF FLORIDA. VENUE FOR ANY
         PROCEEDING BROUGHT TO ENFORCE THE TERMS OF THIS AGREEMENT SHALL BE
         PROPER IN COUNTY OF BROWARD, STATE OF FLORIDA OR THE JURISDICTION IN
         WHICH THE CLAIM ACCRUES.

             16.3 Succession. This Agreement shall be binding upon and shall
         inure to the benefit of the parties, their successors, assigns and
         legal representatives established by operation of law.

             16.4 Entireties. This Agreement constitutes the entire agreement
         between the parties. No modification of this Agreement shall be binding
         unless in writing and signed by both parties, and recorded by a notary
         if necessary.

             16.5 Severability. If any provision of this Agreement is found to
         be illegal, or unenforceable for any reason whatsoever, this Agreement
         shall be interpreted and construed without reference to such provision,
         and the balance of this Agreement shall remain in full force and
         effect.

             16.6 Cooperation. The parties agree to execute such additional
         documents and take such actions as may be required to effectuate the
         purposes of this Agreement.

             16.7 Paragraph Headings. The paragraph headings are inserted in
         this Agreement for convenience only and are not intended to affect the
         terms of this Agreement.

             16.8 Press Releases and Public Announcements. No party shall issue
         any press release nor make any public announcements relating to the
         subject matter of this Agreement prior to the Closing without the prior
         written approval of Buyer.

             16.9 Personal Jurisdiction. Seller hereby irrevocably submits to
         the jurisdiction of the courts of the state of Florida and the federal
         courts of the United States of America located in the state of Florida,
         in respect to the interpretation and enforcement of the provisions of
         this Agreement and of the documents referred to in this Agreement, and
         hereby waives and agrees not to assert as a defense in 

                                       25
<PAGE>

         any action, suit, or proceeding, for the interpretation or enforcement
         hereof, or of any such document, that it is not subject thereto or such
         action, suit, or proceeding not be brought or is not maintainable in
         said courts, or that the venue thereof may not be appropriate or that
         this Agreement or any such documents may not be enforced in or by said
         courts.

             16.10 Counterparts. This Agreement may be executed in counterparts,
         each of which shall be deemed an original and which together shall
         constitute a single instrument.

             16.11 Remedies - Attorneys' Fees. If any party obtains or engages
         an attorney or attorneys for the purpose of enforcing its rights under
         the terms of this Agreement for negotiation, litigation, arbitration or
         other alternative dispute resolution procedure, the prevailing party
         shall be entitled to recover its attorneys' fees, costs, and
         disbursements in addition to any other relief sought or awarded.

             16.12 Time. Time is of the essence of this Agreement.

                                       26
<PAGE>

         IN WITNESS WHEREOF, the parties have executed this Agreement on the
date first above written.

                                        SELLER:

                                        MARIS EQUIPMENT COMPANY, INC.



                                        By: /s/ George E. Mitchell
                                           -------------------------------
                                           George E. Mitchell, Chairman


                                        BUYER:

                                        SECURITY TECHNOLOGIES GROUP, INC.



                                        By: /s/ Mark Landis
                                           -------------------------------
                                           Mark Landis, CEO

                                       27
<PAGE>


                          Supplement to Schedule 1.2(a)


                                  ASSET AMOUNT


The Asset Amount on Schedule 1.2(a) is calculated based upon Seller's Estimated
Closing Balance Sheet, and is subject to adjustment as provided in Sections 1.3,
3.1 and 4.12 of the Agreement.

Procedure for Payment of Deferred Payment.

         (a) The term "Seller Accounts Receivable," includes only those accounts
receivable and unbilled work in process of the Seller reflected on the Closing
Balance Sheet (net of any reserve therefor). Any Seller Account Receivable shall
be deemed to have been collected when payment is actually received by Buyer, or
in the event any account debtor refuses to pay all or any portion of a Seller
Account Receivable based upon (i) the Buyer's failure to perform any of its
obligations under the Agreement, or (ii) the Buyer's failure to perform any of
its obligations to such account debtor (whether arising out of or relating to
the Seller Account Receivable in question).

         (b) Buyer shall permit the Seller to take any and all action which the
Seller shall determine in consultation with the Buyer is reasonably necessary
from time to time to expedite the collection of any of the Seller Accounts
Receivable. The Seller shall not, however, take any action under this paragraph
(b) which materially interferes with the Business conducted by the Buyer after
the Closing Date or to which Buyer reasonably objects. Nothing contained herein
shall impose a duty or obligation, express or implied, upon the Seller to take
any action under this paragraph (b).

         (b) When the balance of Seller Accounts Receivable has been reduced to
$750,000 i.e., the Deferred Payment amount, or such lesser amount based on the
reductions to the Deferred Payment provided for in Section 3.1 and 4.12 of the
Agreement, the Buyer shall make a weekly disbursement to the Seller in an amount
equal to the amount collected or deemed to be collected by the Buyer in respect
of any Seller Accounts Receivable through the end of the preceding week,
provided that the Deferred Payment shall not be reduced below $500,000 by reason
of disbursements under this paragraph (b) except as provided below.

         (c) On or about January 15, 1999, Buyer will prepare an estimate of
Contingent Payments due to Seller, shall provide to Seller copies of all
supporting documentation, and shall afford Seller the opportunity to comment
thereon. If Seller is entitled to a Contingent Payment based upon the Buyer's
estimate calculated as of January 15, 1999, Buyer promptly shall pay to Seller
from the Deferred Payment an amount which will reduce the sum of the 

<PAGE>

Schedule 1.2(a) Supplement
Re:  Maris - STG
Page 2


remaining Deferred Payment and the Contingent Payments to $500,000.00. The
balance of the Deferred Payment, if any, shall be retained by the Buyer, to be
disbursed to Seller on or after March 31, 1999, as provided by paragraph (d)
below.

         (d) If any amount of the Deferred Payment or the Contingent Payments
remain due as of March 31, 1999, and any Seller Accounts Receivable remain
outstanding as of such date, Buyer shall have the option to (i) continue to pay
amounts in respect of such Seller Accounts Receivable as and when collected, or
(ii) reassign to Seller the remaining Seller's Accounts Receivable and retain
from the Deferred Payment and/or the Contingent Payments the amount of such
reassigned Seller's Accounts Receivable.


Dated this 8th day of June, 1998


MARIS EQUIPMENT COMPANY, INC.



By: /s/ George E. Mitchell
    -----------------------------

Name: George E. Mitchell
      ---------------------------

Title: Chairman
       --------------------------

                                       2



<PAGE>



                                  Schedule 1.4

                               CONTINGENT PAYMENT


Subject to the provision of Section 14 of the Agreement, the following
Contingent Payments provided for in Section 1.4 of the Agreement will be paid by
Buyer to Seller based upon the performance of the Business for the calendar year
ending December 31, 1998. Payment will be made on or before March 31, 1999,
pursuant to the procedure set forth below:

         a.  Revenue:      No Contingent Payment based upon gross revenue unless
                           the Business achieves a minimum gross margin of 22%

                           If the Business generates 1998 gross revenue of $13.5
                           million or more, $200,000;

                           If the Business generates 1998 gross revenue of
                           between $11.5 and $13.5 million, an amount equal to
                           $200,000 multiplied by a fraction the numerator of
                           which is the gross revenue in excess of $11.5
                           million, and the denominator of which is $2,000,000;


                           If the Business generates 1998 gross revenue of below
                           $11.5 million, no payment.

         b.                Margins: No Contingent Payment based upon gross
                           margins unless the Business achieves a minimum gross
                           revenue of $11.5 million

                           If the Business generates gross margins for 1998 of
                           24% or more, $200,000;

                           If the Business generates gross margins for 1998 of
                           between 22% and 24%, an amount equal to $200,000
                           multiplied by a fraction the numerator of which is
                           the gross margins achieved in excess of 22%, and the
                           denominator of which is 2%;

                           If the Business generates gross margins for 1998 of
                           below 22%, no payment.
<PAGE>

Schedule 1.4
Re: Maris - STG
Page 2

         c.  Bookings:     No Contingent Payment based upon bookings unless the
                           Business achieves a minimum gross margins of 22%


                           If the Business generates 1998 bookings of $13.5
                           million or more, $100,000;

                           If the Business generates 1998 bookings of between
                           $12.5 million and $13.5 million, an amount equal to
                           $100,000 multiplied by a fraction the numerator of
                           which is the bookings generated in excess of $12.5
                           million, and the denominator of which is $1,000,000;

                           If the Business generates 1998 bookings of below
                           $12.5 million, no payment.

Procedure for Payment. No later than March 15, 1999, Buyer shall prepare and
deliver to Seller a written calculation (with supporting documents) of the
Contingent Payment expected to be due to the Seller. The parties shall confer in
good faith during the period from March 15, 1999, through March 31, 1999, to
address any revisions suggested by the Seller, to adjust the calculation to take
account of the period from March 15 through March 31, 1999, and to resolve any
disputes about the Buyer's calculation. In the event the parties are unable to
agree on the proper amount to be paid as of March 31, 1999, Buyer shall deposit
with an escrow acceptable to both parties the amount it determines as the
Contingent Payment pending resolution of the dispute.

Dated this 8th day of June, 1998


MARIS EQUIPMENT COMPANY, INC.

                                       2
<PAGE>

Schedule 1.4
Re: Maris - STG
Page 3

By: /s/ George E. Mitchell
    -------------------------------

Name: George E. Mitchell
      -----------------------------

Title: Chairman
       ----------------------------


                                        3



<PAGE>

                           INTERIM SERVICES AGREEMENT
                           --------------------------

                  THIS INTERIM SERVICES AGREEMENT (the "Agreement") made and
entered into this 8th day of June, 1998, by and among MARIS EQUIPMENT COMPANY,
INC. ("Maris"), a Delaware corporation, CORE TECHNOLOGIES (PENNSYLVANIA), INC.
(the "Parent"), a Delaware corporation, and SECURITY TECHNOLOGIES GROUP, INC.
("STG"), a New Jersey corporation.

                                   BACKGROUND
                                   ----------

                  A. Maris and STG have entered into a certain Asset Purchase
and Sale Agreement (the "Purchase Agreement") dated the date hereof, pursuant to
which Maris has sold and STG has purchased substantially all of the assets of
Maris, on the terms and subject to the conditions set forth therein.

                  B. Closing under the Purchase Agreement is occurring on the
date hereof but is effective as of June 1, 1998.

                  C. The Parent is the sole shareholder of Maris and has
heretofore provided various services to Maris in connection with the operation
of the Business.

                  D. In connection with and as a condition to the completion of
the purchase, sale, and related transactions described in and contemplated by
the Purchase Agreement, Maris and the Parent (collectively, the "Provider") have
agreed to provide, among other things, certain transitional accounting,
management, and related services to STG, on the terms and subject to the
conditions of this Agreement.

                  E. This Agreement is being executed and delivered by the
parties hereto pursuant to and in satisfaction of the requirements of Section
6.7 of the Purchase Agreement.

                  NOW, THEREFORE, in consideration of the mutual promises
contained herein and intending to be legally bound hereby, the parties hereto
covenant and agree as set forth below.

                  1. Incorporation of Background. The Background provisions of
this Agreement are incorporated herein by reference thereto as if fully set
forth in this Agreement.

                  2. Defined Terms. Any capitalized terms used in this Agreement
which are not defined, but which are defined in the Purchase Agreement, shall
have the meanings ascribed to such terms in the Purchase Agreement.

                                       1
<PAGE>


                  3. Services. On the terms and subject to the conditions of
this Agreement, for and during the Term (as hereinafter defined), the Provider
shall provide, or cause to be provided, the following services to STG
(collectively, the "Services"):

                     (a) Sharing of Space. Pursuant to that certain Agreement of
Lease dated July 23, 1986, as modified through the date hereof (the "Office
Lease") between Brandywine Realty Trust (by assignment) (the "Landlord") and
Maris, the Landlord leases to Maris those certain premises and related
facilities situate in the Whiteland Business Park, 110 Summit Drive, West
Whiteland Township, Exton, Pennsylvania (collectively, the "Premises"). A
portion of the Premises has heretofore been used as office space and for related
uses by employees of Maris in connection with the Business, as more fully
described in Schedule 1.2.6 to the Purchase Agreement (collectively, the "Maris
Space"). The remaining portion of the Premises has heretofore been and will
hereafter continue to be used as office space and for related uses by employees
of Airo Clean Engineering, Inc. ("Airo Clean") (of which the Parent is also the
sole shareholder) in connection with the Airo Clean business. As part of the
Services, Maris hereby grants to STG the right to use (i) the Maris Space, (ii)
the common areas and utilities (including, without limitation, entrance ways,
the lobby area, the bathroom facilities, and warehouse area) associated with the
Premises, which right under this clause (ii) shall be shared in common with the
Parent, Airo Clean, and their respective employees, agents, representatives, and
invitees, and (iii) no less than thirty-six (36) parking spaces in the parking
lot which serves the Premises, which right under this clause (iii) shall be
shared in common with the Parent, Airo Clean, and their respective employees,
agents, representatives, and invitees. STG shall use the Maris Space and related
areas under this Section 3(a) solely and exclusively for the conduct of the
Business and lawful uses reasonably incidental thereto and shall not violate any
term or provision of the Office Lease in connection therewith.

                     (b) Telephone and Related Facilities. Provider shall cause
those STG employees who work out of the Maris Space (i) to be able to access the
internet thereat, and (ii) with local and long-distance telephone and facsimile
service (including maintenance services) through those third-party service
providers currently utilized by the Provider.

                     (c) Accounting Services. Maris has engaged Ms. Carrie Key,
former Controller of Maris ("Ms. Key"), as consultant for the purpose of
performing certain accounting and related services for Maris. Maris shall cause
Ms. Key (or a suitable replacement) to continue to render such accounting and
related services for and on behalf of STG during the Term.

                                       2
<PAGE>


                     (d) Related Support Services. Provider shall also (i)
permit STG to use its copying machine in common with Airo Clean, (ii) provide
STG with exclusive use of the postage meter heretofore used by Maris in
connection with the operation of the Business, and (iii) provide coffee, tea,
and bottled water to STG employees at no charge to such employees.

                     (e) Cash Disbursements Services. The Parent shall furnish
the services of Frederick E. Franks, III ("Mr. Franks") for the purpose of
preparing a weekly accounts payable, petty cash, COD, and employee expense
report (the "Expense Report") relating and pertaining to expenses incurred by
STG after the Closing in connection with the Business, which Expense Report
shall be promptly furnished to STG for review and approval. As soon as
practicable following STG's review and approval of the Expense Report, the
Parent shall cause Mr. Franks to prepare and deliver (but not sign) STG checks
to STG for signature in satisfaction of expenses reflected on the Expense Report
payment of which has been authorized by STG.

                     (f) Financial Reporting. The Parent shall cause Mr. Franks
to continue to prepare and furnish to STG those weekly and monthly financial
statements with respect to the Business in the form and of the type heretofore
prepared by Mr. Franks as an officer of Maris.

                     (g) Transitional Management Services. In order to ensure a
smooth and orderly transition in the ownership and operation of the Business,
but only for a period of three (3) months after the date hereof, the Parent
shall make the services of George E. Mitchell and Mr. Franks available to STG on
an as-needed basis and in a manner which is mutually and reasonably acceptable
to the parties hereto.

                  4. Charges for Services. For and in consideration of the
Services furnished by or on behalf of the Provider to STG under this Agreement,
STG shall pay to the Provider those fees, charges, and related costs described
on Schedule "A" attached hereto and made a part hereof (the "Charges"). The
Charges for the Services provided under Section 3(a) shall be due and payable,
without notice or demand, on the first day of each month during the Term and on
the last day of the Term. All other Charges shall be due and payable within five
(5) days following STG's receipt of an invoice from the Provider with respect
thereto. Charges for periods of less than a full month or other applicable
period shall be proportionately reduced.

                                       3
<PAGE>


                  5. Payments; Late Charges. All payments by STG hereunder shall
be made to the Provider at the Premises or such other place or places as the
Provider made direct, prior to the close of business on the date of payment, in
lawful money of the United States of America. If STG shall fail to pay any
payment due hereunder within thirty (30) days after the date it is due, STG
shall immediately pay to the order of the Provider, without notice or demand, a
late charge equal to one percent (1%) of the amount overdue to defray part of
the additional expense incurred by the Provider in connection with the
delinquency and collection of the overdue amount. The foregoing provision for
such late charge shall not be construed to permit STG to make any payment after
its due date, obligate the Provider to accept any overdue payment, or affect the
Provider's rights and remedies upon the occurrence and continuance of a Default.

                  6. Term of Agreement. This Agreement shall commence on the
date hereof and continue until April 30, 1999 (the "Initial Term"); provided,
however, (i) the Agreement may be renewed thereafter on a month-to-month or
other basis (each a "Renewal Term") on such terms and conditions as may be
agreed to in writing by the parties hereto prior to the expiration of the
Initial Term or any Renewal Term, as appropriate, and (ii) at any time during
the Term, STG shall have the right to terminate and any of the Services being
furnished pursuant to Sections 3(c), 3(e), 3(f), and 3(g) upon fifteen (15)
days' advance written notice to the Provider so long as all accrued Charges with
respect to such Services are fully paid in connection with such termination and
cancellation. The Initial Term and any Renewal Term are collectively referred to
herein as the "Term."

                  7. Covenants of STG. In connection with the transactions
described in this Agreement, STG covenants and agrees that:

                     (a) Receptionist Services. STG shall provide, or cause to
be provided, a receptionist during the Term who will serve as receptionist for
both the Provider and STG at no cost to the Provider; provided, however, the
Provider shall, as a condition to receiving such services, reimburse STG for
fifty percent (50%) of the salary paid by STG to such receptionist while
rendering services on behalf of Provider, which reimbursement may be effected by
a reduction to the Changes otherwise payable to Provider.

                     (b) Compliance With Regulations. STG shall comply with any
and all reasonable rules, regulations, and conditions imposed by the Provider at
any time and from time to time in connection with the Services.

                                       4
<PAGE>


                     (c) Insurance. STG shall maintain liability and other
insurance of types and in amounts reasonably satisfactory to Provider naming the
Provider as an additional insured thereunder. Concurrently with the execution
hereof and upon the request of the Provider at any time and from time to time,
STG shall furnish the Provider with an insurance certificate, in form and
substance satisfactory to the Provider, evidencing that STG is in compliance
with the provisions of this Section 7(c). Provider's rights under this Section
7(c) shall not adversely affect the rights of Citicorp USA, Inc. ("Citicorp") as
secured lender of STG.

                  8. Covenant of Cooperation. The Provider and STG covenant and
agree to cooperate in good faith with one another in order to effect the intent
and purposes of this Agreement.

                  9. No Liability of Maris. Notwithstanding anything contained
herein to the contrary, Provider shall have no liability to STG or any of its
agents, officers, directors, employees, successors, assigns, or affiliates, for
and with respect to any breach or violation of this Agreement caused, in whole
or in part, by a third-party service provider utilized by the Provider in
connection with furnishing any of the Services.

                  10. Defaults; Remedies.

                     (a) Either party shall have the right, upon written notice
to the other party, to terminate and cancel this Agreement if any of the
following events shall occur (each a "Default"):

                         (i) the other party shall fail to make any payment
         required to be made hereunder within five (5) days after the due date
         thereof;

                         (ii) the other party shall breach any term, condition,
         covenant, or agreement contained in this Agreement and such other party
         shall have failed to cure such breach within thirty (30) days after
         such party's receipt of written notice thereof; or

                         (iii) the other party shall become subject to any
         bankruptcy (whether voluntary or involuntary), insolvency, or similar
         proceedings.

                     (b) Rights Upon Defaults. Notwithstanding anything
contained herein to the contrary, each party's rights and remedies as a
consequence of the occurrence of any Default shall be limited to the termination
of and cancellation of this Agreement; provided, however, upon such termination,
each party shall pay all accrued unpaid sums and amounts due to the other party
under and pursuant to this Agreement.


                                       5
<PAGE>

                  11. Entire Agreement. This Agreement constitutes the entire
agreement between the parties hereto with respect to the subject matter hereof
and may not be amended or modified except by a written agreement of the parties
hereto.

                  12. Binding Effect. This Agreement shall inure to the benefit
of and be binding upon the parties hereto and their respective successors.
Nothing in this Agreement, expressed or implied, is intended to confer on any
other person other than the parties hereto, or their respective successors, any
rights, remedies, obligations or liabilities under or by reason of this
Agreement. For purposes of this Section 12, Citicorp shall, at its written
election, be deemed a successor to STG in the event that it forecloses upon its
liens or security interests in STG's assets at any time after the date hereof
and prior to the expiration of the Term.

                  13. Assignability. This Agreement and any rights or
obligations pursuant hereto shall not be assignable by either party without the
prior written consent of the other party.

                  14. No Joint Venture. Nothing in this Agreement shall be
deemed to constitute the parties hereto as joint venturers, partners, or
participants in an unincorporated business or other separate entity.

                                       6
<PAGE>


                  15. Governing Law. This Agreement shall be governed by and
construed in accordance with the domestic internal laws (but not the law of
conflicts of law) of the Commonwealth of Pennsylvania.

                  16. Signature in Counterparts. This Agreement may be executed
in any number of counterparts with the same effect as if the signatures thereto
and hereto were upon the same instrument, but all of such counterparts taken
together shall be deemed to constitute one and the same instrument.

                  IN WITNESS WHEREOF, the parties hereto have executed and
delivered this Agreement as of the day and year first above written.

                                MARIS EQUIPMENT COMPANY, INC.

                                By   /s/ George E. Mitchell
                                  ----------------------------------------
                                  Name: George E. Mitchell
                                  Title: Chairman 


                                CORE TECHNOLOGIES (PENNSYLVANIA), INC.

                                By  /s/ George E. Mitchell
                                  ----------------------------------------
                                  Name: George E. Mitchell
                                  Title: CEO


                                SECURITY TECHNOLOGIES GROUP, INC.

                                By  /s/ Mark Landis
                                  ----------------------------------------
                                  Name: Mark Landis
                                  Title: CEO

                                       7
<PAGE>


                                  SCHEDULE "A"
                                  ------------

                             Description of Charges
                             ----------------------
<TABLE>
<CAPTION>


                    Covered Service                                                  Charges*
                    ---------------                                                  ------- 
<S>                                                            <C>
Service furnished pursuant to Section 3(a)                     $10,824.00 per month

Service furnished pursuant to Section 3(b)

  (i) internet access                                          Actual cost to Provider to be shared equally by
                                                               Provider and STG regardless of actual usage

 (ii) Executone maintenance services                           Actual cost to Provider to be shared equally by
                                                               Provider and STG regardless of actual usage

(iii) ATX Watts Long Distance                                  **Actual cost to Provider based upon actual usage
                                                               by STG

 (iv) Bell of PA (local telephone service)                     **Actual cost to Provider based upon actual usage
                                                               by STG

Services furnished pursuant to Section 3(c)                    Actual cost to Provider based on consultant's
                                                               invoice

Services furnished pursuant to Section 3(d)

  (i) Use of copying machine                                   Actual cost to Provider based upon actual usage

 (ii) Use of postage meter                                     Actual cost to Provider based upon actual usage

(iii) Coffee, tea, and bottled water                           Actual cost to Provider to be shared equally by
                                                               Provider and STG regardless of actual usage

Services under Sections 3(e), 3(f) and 3(g)                    $5,000 for the first month after Closing, reducing by
                                                               $1,000 for each month thereafter


</TABLE>

- -----------
 * If and to the extent Provider is unable to allocate the cost of any Service 
   based upon usage, such cost shall be shared equally by the Provider and STG.
** Cost to be determined through a personal identification or similar
   identifying system.

                                        8

<PAGE>


                             CORE TECHNOLOGIES, INC.


                    Core Technologies to Focus on Airo Clean


Exton, Pennsylvania, June 8, 1998 - Core Technologies announced today it has
completed the sale of its Maris Equipment subsidiary to The Security
Technologies Group (STG) of Plantation, Florida.

George E. Mitchell, CEO of Core Technologies, stated that the Company would now
focus its effort on growing the clean room and healthcare business of Airo
Clean. "For the last few years, our business and financial resources have, by
necessity, been directed toward stabilizing Maris", Mitchell stated. "We now
plan to step up the activity on expanding distribution, developing new strategic
partnerships and pursuing some new markets for Airo Clean products," he
continued.

Founded in 1984, Core Technologies is based in Exton, Pennsylvania. The
Company's common stock is quoted on the NASDAQ Electronic Bulletin Board under
the symbol "CCOR".


- --------------------------------------------------------------------------------
                                  PRESS RELEASE
- --------------------------------------------------------------------------------

Corporate Headquarters - 110 Summit Drive, Exton, PA 19341-2838 - 610-524-7000.
Further Information Contact: Frederick B. Franks, III, VP Finance & Treasurer.
Home Page http://www.cortek.com


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