Document:

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                      SMITH & CO. SURVEYING SERVICES, INC.

                             PLAN OF REORGANIZATION
                                       AND
                            SHARE EXCHANGE AGREEMENT

                                January 29, 2003

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                                TABLE OF CONTENTS

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                                                                                                          Page
                                                                                                          ----
<S>                                                                                                       <C>
I.       Definitions                                                                                        6

II.      Representations and Warranties of Stockholders                                                     10
         ss.2.01    Subsidiaries; Organization and Qualification                                            10
         ss.2.02    Authority; No Conflict                                                                  10
         ss.2.03    Capitalization                                                                          11
         ss.2.04    Financial Condition                                                                     12
         ss.2.05    Tax and Other Liabilities                                                               13
         ss.2.06    Litigation and Claims                                                                   14
         ss.2.07    Properties                                                                              14
         ss.2.08    Contracts and Other Instruments                                                         15
         ss.2.09    Employees                                                                               16
         ss.2.10    Patents, Trademarks, Et Cetera                                                          18
         ss.2.11    Investment Representations and Covenants                                                19
         ss.2.12    Brokers or Finders                                                                      20
         ss.2.13    Questionable Payments                                                                   20
         ss.2.14    Completeness of Disclosure                                                              20

III.     Representations and Warranties of the Purchaser                                                    21
         ss.3.01    Organization                                                                            21
         ss.3.02    Authority: No Conflict                                                                  20
         ss.3.03    Capitalization                                                                          22
         ss.3.04    Financial Condition                                                                     22
         ss.3.05    Private Placement Memorandum                                                            22
         ss.3.06    Non-Distributive Intent                                                                 23
         ss.3.07    Certain Proceedings                                                                     23
         ss.3.08    Brokers or Finders                                                                      23
         ss.3.09    Compliance with Laws                                                                    23
         ss.3.10    Completeness of Disclosure                                                              23
         ss.3.11    Purchaser Due Diligence                                                                 23

IV.      Exchange of the Smith Shares                                                                       24
         ss.4.01    Terms of the Sale                                                                       24
         ss.4.02    The Closing                                                                             25
         ss.4.03    Indemnity Against Liabilities                                                           26

V.       Covenants and Agreements of the Company and Stockholders                                           26
         ss.5.01    Access                                                                                  26
         ss.5.02    Conduct of Business                                                                     27

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         ss.5.03    Advice of Changes                                                                       28
         ss.5.04    Confidentiality                                                                         28
         ss.5.05    Public Statements                                                                       29
         ss.5.06    Other Proposals                                                                         29
         ss.5.07    Consents Without Any Condition                                                          29
         ss.5.08    Release by Stockholders                                                                 29
         ss.5.09    Noncompetition                                                                          30
         ss.5.10    Voting by Stockholders                                                                  30
         ss.5.11    Employment Agreements                                                                   31
         ss.5.12    Assumption of Unfunded Employee Benefit Plan Liabilities                                31

VI.      Covenants and Agreements of the Purchaser                                                          31
         ss.6.01    Continuation of Employment                                                              31
         ss.6.02    Advice of Changes                                                                       31
         ss.6.03    Confidentiality                                                                         32
         ss.6.04    Notice of Breaches by Purchaser                                                         32
         ss.6.05    Regulatory Filings                                                                      32
         ss.6.06    Bank/Institutional Indebtedness                                                         33
         ss.6.07    Consummation of Agreement                                                               33
         ss.6.08    Shareholder Agreement                                                                   33

VII.     Conditions to Obligations of the Purchaser                                                         33
         ss.7.01    Accuracy of Representations and Compliance with Conditions                              33
         ss.7.02    Opinion of Counsel                                                                      33
         ss.7.03    Other Closing Documents                                                                 33
         ss.7.04    Review of Proceedings                                                                   34
         ss.7.05    Legal Action                                                                            34
         ss.7.06    No Governmental Action                                                                  34
         ss.7.07    Governmental Approval                                                                   34
         ss.7.08    Contractual Consents Needed                                                             34
         ss.7.09    Hart-Scott-Rodino Waiting Period                                                        34
         ss.7.10    Insurance on Key Employees                                                              35
         ss.7.11    Resignations                                                                            35
         ss.7.12    Releases                                                                                35
         ss.7.13    Officers' and Directors' Confidentiality and Noncompetition Agreement                   35
         ss.7.14    Condition of Property                                                                   36

VIII.    Conditions to the Obligations of the Company and Stockholders                                      36
         ss.8.01    Accuracy of Representations and Compliance With Conditions                              36
         ss.8.02    Other Closing Documents                                                                 36
         ss.8.03    Review of Proceedings                                                                   36
         ss.8.04    Proceedings                                                                             36
         ss.8.05    No Governmental Action                                                                  36
         ss.8.06    Governmental Approval                                                                   37
         ss.8.07    Contractual Consents Needed                                                             37
         ss.8.08    Employment Agreement and Stockholders Agreement                                         37

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IX.      Miscellaneous                                                                                      37
         ss.9.01    Brokerage Fees                                                                          37
         ss.9.02    Expenses                                                                                38
         ss.9.03    Further Actions                                                                         38
         ss.9.04    Availability of Equitable Remedies                                                      38
         ss.9.05    Survival                                                                                38
         ss.9.06    Appointment of Agent                                                                    38
         ss.9.07    Modification                                                                            39
         ss.9.08    Notices                                                                                 39
         ss.9.09    Waiver                                                                                  39
         ss.9.10    Joint and Several Obligations                                                           39
         ss.9.11    Binding Effect                                                                          40
         ss.9.12    No Third Party Beneficiaries                                                            40
         ss.9.13    Separability                                                                            40
         ss.9.14    Headings                                                                                40
         ss.9.15    Counterparts; Governing Law                                                             40
         ss.9.16    No Assignment                                                                           40
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                         LIST OF SCHEDULES AND EXHIBITS

SCHEDULE 2.01 COMPANY ORGANIZATION
SCHEDULE 2.02 CONSENTS
SCHEDULE 2.06 LITIGATIONS AND CLAIMS
SCHEDULE 2.07 PROPERTIES OWNED, LEASED, AND LICENSED
SCHEDULE 2.08 CONTRACTS, AGREEMENTS, INSTRUMENTS, AND ARRANGEMENTS
SCHEDULE 2.09 EMPLOYEE PLANS AND BENEFITS AND COMPENSATION OF CERTAIN
              EMPLOYEES AND AGENTS
SCHEDULE 2.10 PATENTS, TRADEMARKS, ETC.

EXHIBIT A  -  FORM OF EMPLOYMENT AGREEMENT WITH GREG SMITH
EXHIBIT B  -  COMPANY'S OFFICERS' CERTIFICATE CONCERNING ACCURACY
EXHIBIT C  -  STOCKHOLDERS' CERTIFICATE CONCERNING ACCURACY
EXHIBIT D  -  FORM OF OPINION OF COUNSEL TO COMPANY AND STOCKHOLDERS
EXHIBIT E  -  RELEASE
EXHIBIT F  -  CONFIDENTIALITY AND NON COMPETE AGREEMENT
EXHIBIT G  -  PURCHASER'S OFFICERS' CERTIFICATE

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                             PLAN OF REORGANIZATION
                                       AND
                            SHARE EXCHANGE AGREEMENT

         Agreement, dated as of January 29, 2003, by and among Centra
Industries, Inc., a Delaware corporation with offices at Two North College
Avenue, Fayetteville, Arkansas 72701 (the "Purchaser"); Gregory J. Smith,
residing at 140 Fenwick Drive, Bakersfield, California 93312 ("Smith") and Paul
K. Chavez, residing at 7713 Gallup Drive, Bakersfield, California 93309
("Chavez") (collectively, the "Stockholders"); and Smith & Co. Surveying
Services, Inc., a California corporation with offices at 2005 Airport Drive,
Bakersfield, California 93308 (the "Company").

                                     RECITAL

         The Purchaser desires to acquire all of the outstanding capital stock
of the Company from the Stockholders solely in exchange for shares of the
Purchaser's Common Stock, and the Stockholders desire to effect such exchange on
the terms and conditions set forth in this Agreement.

         The parties intend that the exchange of shares provided in this
Agreement will qualify as a reorganization within the meaning of Section 351 and
Section 368 (a)(1)(B) of the Internal Revenue Code of 1986, as amended (the
"Code"), and the provisions of this Agreement shall be interpreted as a plan of
reorganziation in a manner consistent with this intent.

I.       DEFINITIONS

         For purposes of this Agreement, the following terms have the meanings
specified or referred to in this Section 1:

         "ACCRUED BENEFITS" -- as defined in Section 2.09(b).

         "ACCRUED LIABILITIES" -- as defined in Section 2.09(b).

         "ADDITIONAL PAYMENT" -as defined in Section 4.01.

         "BREACH" -- a "breach" of any representation, warranty, covenant,
obligation, or other provision of this Agreement or any instrument delivered
pursuant to this Agreement

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will be deemed to have occurred if there is or has been (a) any inaccuracy in or
violation or default of, or any failure to perform or comply with, such
representation, warranty, covenant, obligation, or other provision, or (b) any
claim (by any person) or other occurrence or circumstance that is or was
inconsistent with such representation, warranty, covenant, obligation, or other
provision, and the term "breach" means any such inaccuracy, violation, default,
failure, claim, occurrence, or circumstance.

         "BINDING FINANCING COMMITMENT" -- as defined in Section 7.16.

         "CENTRA SHARES" --the shares of Common Stock of the Purchaser being
issued to the Stockholders in exchange for the Smith Shares.

         "CLOSING" - as defined in Section 4.02.

         "CLOSING DATE" -- January 29, 2003 or such other date as of which the
Closing actually takes place.

         "CODE" -- as defined in Section 2.09(c).

         "COMPANY-STOCKHOLDERS' CLOSING DOCUMENTS" -- as defined in Section
2.02.

         "CONSENT" -- any approval, consent, ratification, waiver, or other
authorization (including any Governmental Authorization).

         "CONTEMPLATED TRANSACTIONS" - all of the transactions contemplated by
this Agreement, including:

         (a) exchange of the Smith Shares by the Stockholders for shares of the
Purchaser's Common Stock;

         (b) the execution, delivery, and performance of the Employment
Agreement, the Stockholders Agreement and the Stockholders' Release;

         (c) the performance by the Company, Stockholders and Purchaser of their
respective covenants and obligations under this Agreement; and

         (d) Purchaser's acquisition and ownership of the Smith Shares and
exercise of control over the Company.

         "CONTRACT" -- any agreement, contract, obligation, promise, or
undertaking (whether written or oral and whether express or implied) that is
legally binding.

         "EMPLOYEE BENEFIT PLAN" -- as defined in Section 2.09(a).

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         "EMPLOYMENT AGREEMENT" -- as defined in Section 5.11.

         "ENCUMBRANCE" -- any charge, claim, community property interest,
condition, equitable interest, lien, option, pledge, security interest, right of
first refusal, or restriction of any kind, including any restriction on use,
voting, transfer, receipt of income, or exercise of any other attribute of
ownership.

         "ERISA" -- as defined in Section 2.09(a).

         "GAAP" -- as defined in Section 2.04.

         "HAZARDOUS SUBSTANCE" -- as defined in Section 2.07(f).

         "INTANGIBLES" -- as defined in Section 2.10.

         "IRS OR A INTERNAL REVENUE SERVICE" -- The United States Internal
Revenue Service or any successor agency, and, to the extent relevant, the United
States Department of the Treasury.

         "KNOWLEDGE" -- an individual will be deemed to have "Knowledge" of a
particular fact or other matter if:

         (a) such individual is actually aware of such fact or other matter; or

         (b) a prudent individual could be expected to discover or otherwise
become aware of such fact or other matter in the course of conducting a
reasonably comprehensive investigation concerning the existence of such fact or
other matter.

         A person (other than an individual) will be deemed to have "Knowledge"
of a particular fact or other matter if any individual who is serving, or who
has at any time served, as a director, officer, partner, executor, or trustee of
such Person (or in any similar capacity) has, or at any time had, Knowledge of
such fact or other matter.

         "LAST UNAUDITED BALANCE SHEET" -- as defined in 2.04.

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         "LAST UNAUDITED BALANCE SHEET DATE" -- the date of the Last Unaudited
Balance Sheet.

         "PARTICIPATE IN" -- as defined in Section 5.09.

         "PENSION PLAN" -- as defined in Section 2.09(a).

         "PERSON" -- any individual, corporation (including any non-profit
corporation), general or limited partnership, limited liability company, joint
venture, estate, trust, association, organization, labor union, or other entity
or Governmental Body.

         "PROCEEDING" -- any action, arbitration, audit, hearing, investigation,
litigation, or suit (whether civil, criminal, administrative, investigative, or
informal) commenced, brought, conducted, or heard by or before, or otherwise
involving, any Governmental Body or arbitrator.

         "PURCHASER'S CLOSING DOCUMENTS" -- as defined in Section 3.02(a).

         "PURCHASE PRICE" -- as defined in Section 4.01.

         "RELEASES" -- as defined in Sections 7.14.

         "RELEASE TIME" -- as defined in Section 5.01.

         "SECURITIES ACT" -- The Securities Act of 1933, as amended or any
successor law, and regulations and rules issued pursuant to that Act or any
successor law.

         "SMITH SHARES" -- the two hundred (200) shares of Common Stock of the
Company which are all the outstanding shares of capital stock of the Company,
and which are being exchanged by the Stockholders for shares of Purchaser's
Common Stock.

         "STOCKHOLDER'S RESPECTIVE PORTION" -- as defined in Section 2.03.

         "SUBSIDIARY" -- with respect to any Person (the "Owner"), any
corporation or other Person of which securities or other interests having the
power to elect a majority of

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that corporation's or other Person's board of directors or similar governing
body, or otherwise having the power to direct the business and policies of that
corporation or other Person (other than securities or other interests having
such power only upon the happening of a contingency that has not occurred) are
held by the Owner or one or more of its Subsidiaries; when used without
reference to a particular Person, "Subsidiary" means a Subsidiary of the
Company.

         "TAKE-OVER PROPOSAL" -- as defined in Section 5.06.

         "TAXES" - as defined in Section 2.05.

         "TAX RETURN" -- any return (including any information return), report,
statement, schedule, notice, form, or other document or information filed with
or submitted to, or required to be filed with or submitted to, any Governmental
Body in connection with the determination, assessment, collection, or payment of
any Tax or in connection with the administration, implementation, or enforcement
of or compliance with any Legal Requirement relating to any Tax.

II.      REPRESENTATIONS AND WARRANTIES OF THE COMPANY AND THE STOCKHOLDERS

         The Company and the Stockholders jointly and severally represent and
warrant to the Purchaser as follows:

         ss.2.01 Subsidiaries; Organization and Qualification

                  (a) The Company does not own, directly or indirectly, any
subsidiary. The Company has no or affiliate corporation and does not own any
interest in any other enterprise (whether or not such enterprise is a
corporation). Schedule 2.01 also correctly sets forth as to Company its place of
incorporation, principal place of business, jurisdictions in which it is
qualified to do business, and the business which it presently conducts and which
it contemplates conducting.

                  (b) The Company a corporation duly organized, validly
existing, and in good standing under the laws of its jurisdiction of
incorporation, with all requisite power and authority, and all necessary
consents, authorizations, approvals, orders, licenses, certificates, and permits
of and from, and declarations and filings with, all federal, state, local, and
other governmental authorities and all courts and other tribunals, to own,
lease, license, and use its properties and assets and to carry on the business
in which it is now engaged and the business in which it contemplates engaging.
The Company is duly qualified to transact the business in which it is engaged
and is in good
<PAGE>

standing as a foreign corporation in every jurisdiction in which its ownership,
leasing, licensing, or use of property or assets or the conduct of its business
makes such qualification necessary or where the failure to be so qualified would
have a material adverse effect on the business, financial condition or
properties of the Company.

         ss.2.02 Authority; No Conflict

                  The Company and Stockholders have all requisite power and
authority to execute, deliver, and perform this Agreement and the Contemplated
Transactions. All necessary corporate proceedings of the Company have been duly
taken to authorize the execution, delivery, and performance of this Agreement by
the Company. This Agreement has been duly authorized, executed, and delivered by
the Company and the Stockholders, constitutes the legal, valid, and binding
obligation of the Company and Stockholders and is enforceable (subject to
applicable bankruptcy, insolvency and other laws affecting the enforceability of
creditors rights generally and equitable remedies) as to each of them in
accordance with its terms. Upon the execution and delivery by the Company and
the Stockholders the of all agreements contemplated by this Agreement
(collectively the "Company-Stockholders' Closing Documents"), the
Company-Stockholders' Closing Documents will constitute the legal, valid and
binding obligations of the Company and Stockholders, enforceable in accordance
with their terms (subject to applicable bankruptcy, insolvency and other laws
affecting the enforceability of creditors rights generally and equitable
remedies). Except as set forth in Sections 7.07, 7.08 and 7.09, no consent,
authorization, approval, order, license, certificate, or permit of or from, or
declaration or filing with, any federal, state, local, or other governmental
authority or any court or other tribunal is required by the Company or any
Stockholder for the execution, delivery, or performance of this Agreement by the
Company or any Stockholder. No consent of any party to any contract, agreement,
instrument, lease, license, arrangement, or understanding to which the Company
or any Stockholder is a party, or to which it or he or any of its or his
respective businesses, properties, or assets are subject, is required for the
execution, delivery, or performance of this Agreement (except such consents
referred to in Schedule 2.02); and the execution, delivery, and performance of
this Agreement will not (if the consents referred to in Schedule 2.02 are
obtained prior to the Closing) violate, result in a breach of, conflict with, or
(with or without the giving of notice or the passage of time or both) entitle
any party to terminate or call a default under, entitle any party to rights and
privileges that such party was not receiving or entitled to receive immediately
before this Agreement was executed under, or create any obligation on the part
of the Company that it was not paying or obligated to pay immediately before
this Agreement was executed under, any term of any such contract, agreement,
instrument, lease, license, arrangement, or understanding, or violate or result
in a breach of any term of the certificate of incorporation (or other charter
document) or by-laws of the Company, (if the conditions in Sections 5.08, 5.09,
5.10 and 5.11 are satisfied), result in a breach of, or conflict with any law,
rule, regulation, order, judgment, or decree binding on the Company or any
Stockholder or to which it or he or any of its or his respective businesses,
properties, or assets are subject. Upon the Closing, Purchaser will have good
title to all of the Smith Shares, free and clear of all liens, security
interests, pledges, charges, encumbrances, stockholders' agreements, and voting
trusts.

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         ss.2.03 Capitalization

                  The authorized capital stock of the Company consists of 10,000
shares of common stock, par value $1.00 per share, of which 200 shares,
constituting the Smith Shares, are outstanding. Each of the Smith Shares is
validly authorized, validly issued, fully paid, and nonassessable, has not been
issued and is not owned or held in violation of any preemptive right of any
stockholder, and the number of Shares owned of record and beneficially by each
Stockholder and the Stockholder's Respective Portion represented by such shares
of the Smith Shares are as follows:

        Name of Shareholder       Number of Shares        Respective Portion
        -------------------       ----------------        ------------------
        Smith                     150                     75%
        Chavez                     50                     25%

in each case free and clear of all liens, security interests, pledges, charges,
encumbrances, stockholders' agreements, and voting trusts. There is no
commitment, plan, or arrangement to issue, and no outstanding option, warrant,
or other right calling for the issuance of, or providing the right to acquire
from the Company or the Stockholders, any share of capital stock of the Company
or any security or other instrument convertible into, exercisable for, or
exchangeable for capital stock of the Company. There is outstanding no option,
warrant or right to purchase, or any security or other instrument convertible
into or exchangeable for, capital stock of the Company.

         ss.2.04 Financial Condition

         The Company has delivered to the Purchaser true and correct copies of
the following audited financial statements of the Company (the "Company's
Audited Financial Statements"): balance sheet as of September 30, 2001 (the
"Last Audited Balance Sheet") and statement of income, statement of retained
earnings, and statement of cash flows for the fiscal year ended September 30,
2001. The Company also has delivered to the Purchaser true and correct copies of
the following unaudited financial statements of the Company (the "Company's
Unaudited Financial Statements"): balance sheet as of June 30, 2002 (the "Last
Unaudited Balance Sheet") and statement of income, statement of retained
earnings, and statement of cash flows for the six months ended June 30, 2002.
The Company's Audited and Unaudited Financial Statements present fairly the
financial condition of the Company as of September 30, 2001 and June 30, 2002,
respectively. The Company's Audited and Unaudited Financial Statements have been
prepared in accordance with generally accepted accounting principles
consistently applied throughout the periods involved ("GAAP") and are in
accordance with the books and records of the Company. Since the Last Unaudited
Balance Sheet:

         (a)      There has at no time been a material adverse change in the
                  financial condition, results of operations, business,
                  properties, assets, liabilities, or future prospects of the
                  Company.

         (b)      The Company has not authorized, declared, paid, or effected
                  any dividend or liquidating or other distribution in respect
                  of its capital

<PAGE>

                  stock or any direct or indirect redemption, purchase, or other
                  acquisition of any stock of the Company.

         (c)      The operations and business of the Company have been conducted
                  in all respects only in the ordinary course.

         (d)      The Company has not accepted a purchase order or quotation,
                  arrangement, or understanding for future sale of its products
                  or services except in the ordinary course of business and
                  which the Company and the Stockholders expect will be
                  profitable.

         (e)      The Company has not suffered an extraordinary loss (whether or
                  not covered by insurance) or waived any right of substantial
                  value.

         (f)      The Company has not paid or incurred any tax, other liability,
                  or expense resulting from the preparation of the Agreement and
                  consummation of the Contemplated Transactions, it being
                  understood that Stockholders shall have paid or will pay all
                  such taxes (including stock transfer taxes resulting from this
                  Agreement or the Contemplated Transactions), liabilities, and
                  expenses.

         Neither the Company or the Stockholders knows of any fact or condition
which materially adversely affects or may materially adversely affect in the
future (as far as the Company or any Stockholder can foresee) the financial
condition, results of operations, business, properties, assets, liabilities, or
future prospects of the Company, other than those with respect to political or
economic matters of general applicability.

         ss.2.05 Tax and Other Liabilities

         The Company no liability of any nature, accrued or contingent,
including without limitation liabilities for federal, state, local, or foreign
taxes and penalties, interest, and additions to tax (collectively "Taxes") and
liabilities to customers or suppliers, other than as reflected in the last
Unaudited Balance Sheet and the following:

         (a)      Liabilities for which full provision has been made on the Last
                  Unaudited Balance Sheet; and

         (b)      Other liabilities arising since the Last Unaudited Balance
                  Sheet Date and prior to the Closing in the ordinary course of
                  business (which shall not include liabilities to customers on
                  account of defective products or services) which are not
                  inconsistent with the representations and warranties of the
                  Company and the Stockholders or any other provision of this
                  Agreement.

         Without limiting the generality of the foregoing, the amounts set up as
provisions for Taxes on the Last Unaudited Balance Sheet are sufficient for all
accrued and unpaid Taxes of the Company, whether or not due and payable and
whether or not disputed,

<PAGE>

under tax laws, as in effect on the Last Unaudited Balance Sheet Date or now in
effect, for the period ended on such date and for all fiscal periods prior
thereto.

         To the knowledge of the Company and the Stockholders, the execution,
delivery, and performance of this Agreement by the Company will not cause any
Taxes to be payable (other than by Stockholders) or cause any lien, charge, or
encumbrance to secure any Taxes to be created either immediately or upon the
nonpayment of any Tax (other than on the properties or assets of Stockholders).
The Internal Revenue Service has audited and settled or the statute of
limitations has run upon all federal income tax returns of the Company for all
taxable years up to and including the taxable year ended September 30, 19__. The
Company has filed all federal, state, local, and foreign tax returns required to
be filed; has delivered to the Purchaser true and correct copies of each such
return which was filed in the past six years; has paid (or established on the
Last Unaudited Balance Sheet a reserve for) all Taxes, assessments, and other
governmental charges payable or remittable by it or levied upon it or its
properties, assets, income, or franchises which are due and payable; and has
delivered to the Purchaser true and correct copies of all reports as to
adjustments received by any of them from any taxing authority during the past
six years and a statement, initialed by the Purchaser, as to any Proceeding
(formal or informal), or investigation pending, threatened, or in prospect with
respect to any such report or the subject matter of such report.

         ss.2.06 Litigation and Claims

         To the knowledge of the Company and the Stockholders, except as set
forth in Schedule 2.06, there is no Proceeding (formal or informal), pending,
threatened, or in prospect (or any basis therefor known to the Company or any
Stockholder) with respect to the Company, the Shares, or any of their respective
businesses, properties, or assets. The Company is not subject to any present or
threatened strike or other labor disturbance nor, to the knowledge of the
Company or any Stockholder, is any union attempting to represent any employee of
the Company as collective bargaining agent. The Company is not in breach of any
law, rule, regulation, order, judgment, or decree; the Company or any
Stockholder required to take any action in order to avoid such violation or
default.

         ss.2.07 Properties

                  (a) The Company does not own any real property or any
beneficial or legal interest therein. Schedule 2.07 sets forth a true and
complete list of all personal properties and assets owned as of the date hereof
by the Company and of all properties leased or licensed by the Company from or
to a third party (including inventory but not including Intangibles), as of the
date hereof, including with respect to such properties and assets owned by the
Company a statement of cost, book value and (except for land) reserve for
depreciation of each item for tax purposes, and net book value of each item for
financial reporting purposes, and, with respect to such properties and assets
leased or licensed by the Company a description of such lease or license. All
such properties and assets (including Intangibles) owned by the Company are
reflected on the Last Unaudited Balance Sheet (except for acquisitions
subsequent to the Last Unaudited Balance Sheet and prior to the Closing which
are either noted in Schedules 2.07 or 2.10 or are approved

<PAGE>

in writing by the Purchaser). All tangible properties and assets owned, leased,
or licensed by the Company are in good and usable condition (excepting
reasonable wear and tear which is not such as to affect materially and adversely
the consolidated operations of the business of the Company). The Company has
good and marketable title in fee simple absolute to all properties owned by it
and good title to all other properties and assets used in its business or owned
by it (except such properties and assets as are held pursuant to leases or
licenses described in Schedules 2.07 or 2.10), free and clear of all
Encumbrances (except such as are listed in Schedule 2.07).

                  (b) All accounts and notes receivable reflected on the Last
Unaudited Balance Sheet, or arising since the Last Unaudited Balance Sheet Date,
have been collected, or are and will be good and collectible, in each case at
the aggregate recorded amounts thereof after deduction for the reserves
established in accordance with GAAP without right of recourse, defense,
deduction, return of goods, counterclaim, offset, or set off on the part of the
obligor, and, if not collected, can reasonably be anticipated to be paid within
60 days of the date incurred.

                  (c) All inventory of raw materials and work in process of the
Company is usable, and all inventory of finished goods is good and marketable,
on a normal basis in the existing product lines of the Company. In no event do
such inventories represent more than a 3-month supply measured by the volume of
sales or use for the fiscal year ended September 30, 2001. All inventory is
merchantable and fit for the particular purpose for which it is intended.

                  (d) No real property owned, leased, or licensed by the Company
lies in an area which is, or to the knowledge of the Company or any Stockholder
will be, subject to zoning, use, or building code restrictions which would
prohibit, and no state of facts relating to the actions or inaction of another
person or entity or his or its ownership, leasing, licensing, or use of any real
or personal property exists or will exist which would prevent, the continued
effective ownership, leasing, licensing, or use of such property in the business
in which the Company is now engaged or the business in which it contemplates
engaging.

                  (e) The properties and assets (including Intangibles) owned by
the Company or leased or licensed by the Company from a third party constitute
collectively all the properties and assets which are necessary to the business
of the Company as presently conducted or as it contemplates conducting in the
next twelve months.

                  (f) The Company has not caused or permitted its respective
businesses, properties (including properties held pursuant to the leases) or
assets to be used to generate, manufacture, refine, transport, treat, store,
handle, dispose of, transfer, produce, or process any Hazardous Substance except
in compliance with all applicable laws, rules, regulations, orders, judgments,
and decrees, and has not caused or permitted the Release of any Hazardous
Substance on or off the site of any property (including properties held pursuant
to the leases) of the Company or any Subsidiary. The term `Hazardous Substance'
shall mean any hazardous waste, as defined by 42 U.S.C. ss.6903(5), any
hazardous substance, as defined by 42 U.S.C. ss.9601(14), any pollutant or

<PAGE>

contaminant, as defined by 42 U.S.C. ss.9601(33), and all toxic substances,
hazardous materials, or other chemical substances regulated by any other law,
rule, or regulation. The term `Release' shall have the meaning set forth in 42
U.S.C. ss.9601(22).

         ss.2.08    Contracts and Other Instruments

         Schedule 2.08 accurately and completely sets forth a correct and
complete list of Contracts, agreements, instruments, leases, licenses,
arrangements, or understandings with respect to the Company and, with respect to
any of the Smith Shares, each Stockholder. The Company has furnished to the
Purchaser (a) true and correct copies of (i) the certificate of incorporation
(or other charter document) and by-laws of the Company and all amendments
thereto, as presently in effect, certified by the Secretary of the corporation;
and (ii) all Contracts, agreements, and instruments referred to in Schedule 2.08
and (iii) all leases and licenses referred to in Schedule 2.07 and 2.10; and (b)
true and correct written descriptions of all supply, distribution, agency,
financing, or other arrangements or understandings referred to in Schedule 2.08.
None of the Company and the Stockholders, nor (to the knowledge of the Company
or a Stockholder) any other party to any of the foregoing is now or expects in
the future to be in breach of, or in default with respect to complying with, any
material term thereof, and each of the foregoing is in full force and is the
legal, valid, and binding obligation of the parties thereto and (subject to
applicable bankruptcy, insolvency, and other laws affecting the enforceability
of creditors' rights generally) is enforceable as to them in accordance with its
terms.

         To the knowledge of the Company and the Stockholders, each supply,
distribution, agency, financing, or other arrangement or understanding set forth
on Schedule 2.08 is a valid and continuing arrangement or understanding; none of
the Company and other parties thereto has given notice of termination or taken
any action inconsistent with the continuance of such arrangement or
understanding; and the execution, delivery, and performance of this Agreement or
any Contemplated Transaction will not prejudice any such arrangement or
understanding in any way. The Company enjoys peaceful and undisturbed possession
under all leases and licenses under which it is operating. The Company is not
party to or bound by any contract, agreement, instrument, lease, license,
arrangement, or understanding, or subject to any charter or other restriction,
which has had or (to the knowledge of the Company or any Stockholder) may in the
future have a material adverse effect on the financial condition, results of
operations, business, properties, assets, liabilities, or future prospects of
the Company. Other than those listed and so specified in Schedule 2.08, and
except as contemplated by this Agreement, the Company is not engaging and has
not engaged within the last five years, and does not intend to engage in any
contract, agreement, instrument, lease, license, arrangement, or understanding
with, any Stockholder, any director, officer, or employee of the Company, any
relative or affiliate of any Stockholder or of any such director, officer, or
employee, or any other corporation or enterprise in which any Stockholder, any
such director, officer, or employee, or any such relative or affiliate then had
or now has an equity or voting or other interest. The stock ledgers and stock
transfer books and the minute book records of the Company relating to all
issuances and transfers of stock by the Company and all proceedings of the
stockholders and the Board of

<PAGE>

Directors and committees thereof of the Company since their respective
incorporations made available to the Purchaser's counsel are the original stock
ledgers and stock transfer books and minute book records of the Company or true
and complete copies thereof. The Company is not in violation or breach of, or in
default with respect to, any term of its certificate of incorporation (or other
charter document) or by-laws. Except as described in Schedule 2.08, the Company
is not a member of a customer or user organization or of a trade association.

         ss.2.09 Employees

                  (a) Except as set forth in Schedule 2.09, the Company neither
has nor contributes to, any pension, profit-sharing, option, other incentive
plan, or any other type of Employee Benefit Plan (as defined in Section 3(3) of
the Employee Retirement Income Security Act of 1974, as amended ("ERISA")), or
has any obligation to or customary arrangement with employees for bonuses,
incentive compensation, vacations, severance pay, insurance, or other benefits.
The Company has furnished to the Purchaser: (i) true and correct copies,
initialed by the chief executive officer of the Company, of all documents
evidencing plans, obligations, or arrangements referred to in Schedule 2.09 (or
true and correct written summaries, so initialed, of such plans, obligations, or
arrangements to the extent not evidenced by documents) and true and correct
copies, so initialed, of all documents evidencing trusts, summary plan
descriptions, and any other summaries or descriptions relating to any such
plans; (ii) the two most recent annual reports (Form 5500's), if any, including
all schedules thereto and the most recent annual and periodic accounting of
related plan assets with respect to each Employee Benefit Plan; and (iii) the
two most recent actuarial valuations with respect to each Pension Plan (as
defined in Section 3(2) of ERISA) subject to Title IV of ERISA.

                  (b) If any Employee Benefit Plan of the Company were to be
terminated prior to the Closing Date, no liability under Title IV of ERISA would
be incurred by the Company. All Accrued Benefits (as defined in this Section
2.09(b)) (whether or not vested) for all of the Employee Benefit Plans of the
Company (including those terminated) will be fully funded as of the Closing Date
in accordance with the assumptions contained in the regulations of the Pension
Benefit Guaranty Corporation governing the funding of both continuing and
terminated defined benefit plans. For purposes of the preceding sentence,
"Accrued Benefits" shall include the value of disability, pre-retirement, and
death benefits, and all supplements, subsidized, and optional forms of benefits.
All Accrued Liabilities (for contributions or otherwise) (as defined in this
Section 2.09(b)) of the Company as of the Closing Date to each Employee Benefit
Plan and with respect to each obligation to or customary arrangement with
employees for bonuses, incentive compensation, vacations, severance pay,
insurance, or other benefits have been paid or accrued for all periods ending
prior to the Closing Date and no payment to any Employee Benefit Plan or with
respect to any such obligation or arrangement since September 30, 2001 has been
disproportionately large compared to prior payments. For purposes of the
preceding sentence, "Accrued Liabilities" shall include a pro rata contribution
to each Employee Benefit Plan or with respect to each such obligation or
arrangement for that portion of a plan year or other applicable period which
commences prior to and ends after the Closing Date, and Accrued Liabilities for

<PAGE>

any portion of a plan year or other applicable period shall be determined by
multiplying the liability for the entire such year or period by a fraction, the
numerator of which is the number of days preceding the Closing Date in such year
or period and the denominator of which is the number of days in such year or
period, as the case may be.

                  (c) There has been no violation of the reporting and
disclosure requirements imposed either under ERISA or the Internal Revenue Code
of 1986, as amended, or its predecessor statute (the "Code") for which a penalty
has been or may be imposed with respect to any Employee Benefit Plan of the
Company. No Employee Benefit Plan or related trust has any liability of any
nature, accrued or contingent, including without limitation liabilities for
Taxes, other than for routine payments to be made in due course to participants
and beneficiaries, except as set forth in Schedule 2.09. Each Employee Benefit
Plan which is a group health plan within the meaning of Section 162(i)(3) of the
Code is and has been maintained in full compliance with the applicable
requirements of Section 162(k) of the Code. Other than the health care
continuation requirements of Section 162(k) of the Code, the Company has no
obligation to provide post-retirement medical benefits or life insurance
coverage to any present or former employees. There is no litigation,
arbitration, claim, governmental or other proceeding (formal or informal), or
investigation pending, threatened, or in prospect (or any basis therefor known
to the Company or any Stockholder) with respect to any Employee Benefit Plan or
related trust or with respect to any fiduciary, administrator, or sponsor (in
its capacity as such) of any Employee Benefit Plan. No Employee Benefit Plan or
related trust and no such obligation or arrangement is in violation of, or in
default with respect to, any law, rule, regulation, order, judgment, or decree
nor is the Company, any Subsidiary, any Employee Benefit Plan, or any related
trust required to take any action in order to avoid violation or default. No
event has occurred or (to the knowledge of the Company or any Stockholder) is
threatened or about to occur which would constitute a prohibited transaction
under Section 406 of ERISA.

                  (d) Each Pension Plan maintained for the employees of the
Company has been qualified, from its inception, under Section 401(a) of the Code
and any related trust has been an exempt trust for such period under Section 501
of the Code. Each Pension Plan has been operated in accordance with its terms.
No investigation or review by the Internal Revenue Service is currently pending
or (to the knowledge of the Company or any Stockholder) is contemplated in which
the Internal Revenue Service has asserted or may assert that any Pension Plan is
not qualified under Section 401(a) of the Code or that any related trust is not
exempt under Section 501 of the Code. No assessment of any Taxes has been made
or (to the knowledge of the Company or any Stockholder) is contemplated against
the Company or any related trust of any Pension Plan and nothing has occurred
which would result in the assessment of unrelated business taxable income under
the Code. Form 5500's have been timely filed with respect to all Pension Plans.
No event has occurred or (to the knowledge of the Company or any Stockholder) is
threatened or about to occur which would constitute a reportable event within
the meaning of Section 4043(b) of ERISA. No notice of termination has been filed
by the plan administrator pursuant to Section 4041 of ERISA or issued by the
Pension Benefit Guaranty Corporation pursuant to Section 4042 of ERISA with
respect to any Pension Plan.
<PAGE>

                  (e) The Company does not currently contribute to or since
September 16, 1980 has not effectuated either a complete or partial withdrawal
from any multiemployer Pension Plan within the meaning of Section 3(37) of
ERISA.

                  (f) Schedule 2.09 contains a true and correct statement of the
names, relationship with the Company, present rates of compensation (whether in
the form of salary, bonuses, commissions, or other supplemental compensation now
or hereafter payable), and aggregate compensation for the fiscal year ended
September 30, 2001 of (i) each director, officer, or other employee of the
Company whose aggregate compensation for the fiscal year ended exceeded $50,000
or whose aggregate compensation presently exceeds the rate of $50,000 per annum
and (ii) all sales agents, dealers, or distributors of the Company. Except as
set forth in Schedule 2.09, since September 30, 2001 the Company has not changed
the rate of compensation of any of its directors, officers, employees, agents,
dealers, or distributors, nor has any Employee Benefit Plan or program been
instituted or amended to increase benefits thereunder.

                  (g) Following the Closing, the Purchaser and the Company shall
have the right to amend, modify, or terminate any employee benefit plan,
program, or arrangement after the Closing Date.

         ss.2.10 Patents, Trademarks, Et Cetera

         To the knowledge of the Company and the Stockholders, other than as
described in Schedule 2.10, the Company does not own or have pending, and is not
licensed under, any patent, patent application, trademark, trademark
application, trade name, service mark, copyright, franchise, or other intangible
property or asset (all of the foregoing being herein called "Intangibles"), all
of which are in good standing and uncontested. Schedule 2.10 accurately sets
forth a true and complete list of all Intangibles owned by the Company and where
appropriate, a statement of cost, book value and reserve for depreciation of
each item for tax purposes, and net book value of each item for financial
reporting purposes, and with respect to Intangibles licensed by the Company from
or to a third party, a description of such license. None of the Stockholders,
directors, officers, or employees of the Company, any relative or affiliate of
any Stockholder or of any such director, officer, or employee, or any other
corporation or enterprise in which any Stockholder, any such director, officer,
or employee, or any such relative or affiliate had or now has a 1% or greater
equity or voting or other substantial interest, possesses any Intangible which
relates to the business of the Company. The Company has no trademarks to
identify its products and/or services. There is no right under any Intangible
necessary to the business of the Company as presently conducted or as it
contemplates conducting, except such as are so designated in Schedule 2.10. The
Company has not infringed, is not infringing, and has not received notice of
infringement with Intangibles of others. To the knowledge of the Company, or any
Stockholder, there is no infringement by others of Intangibles of the Company or
of any Subsidiary. As far as the Company, or any Stockholder can foresee, there
is no Intangible owned, leased or licensed by or to others which may materially
limit the present or contemplated operations of the Company or may materially
adversely affect the financial condition,

<PAGE>

results of operations, business, properties, assets, liabilities, or future
prospects of the Company.

         ss.2.11 Investment Representations and Covenants

                  ss.2.11.1 The Stockholders represent that they are acquiring
the Centra Shares for their own account and for investment only and not with a
view to distribution or resale thereof within the meaning of such phrase as
defined under the Securities Act. The Stockholders may not dispose of any part
or all of the Centra Shares in violation of the provisions of the Securities Act
and the rules and regulations promulgated under such Act by the Securities and
Exchange Commission ("SEC") and all applicable provisions of State securities
laws and regulations.

                  ss.2.11.2 Legend. The certificate or certificates representing
the Centra Shares shall bear a legend in substantially the following form:

                  "The Shares represented hereby have not been registered under
                  the Securities Act of 1933 and have been acquired for
                  investment and not with a view to distribution or resale. Such
                  Shares may not be sold, mortgaged, pledged, hypothecated or
                  otherwise transferred except in compliance with the terms of
                  an Agreement dated January 29, 2003. A copy of the Agreement
                  may be examined at the Company's offices.

                  ss.2.11.3 Acknowledgment of Restrictions. The Stockholders
acknowledge being informed that the Centra Shares are unregistered and must be
held indefinitely unless they (i) are subsequently registered under the
Securities Act, or (ii) an exemption from such registration is available, and
(iii) the Purchaser will not have an obligation to currently register the Centra
Shares for the Stockholders' account other than as contemplated in the
Stockholders Agreement and the side letter agreement between Centra and the
Stockholders.

                  ss.2.11.4 Access to Information. The Stockholders acknowledge
that they have been afforded access to all material information which they have
requested relevant to Stockholders' decision to acquire the Centra Shares and to
ask questions of Purchaser's management and that, except as set forth herein,
neither Purchaser nor anyone acting on behalf of Purchaser has made any
representations or warranties to stockholders which have induced, persuaded or
stimulated Stockholders to acquire the Centra Shares.

                  ss.2.11.5 Eligibility. Either alone, or together with their
investment advisor(s), the Stockholders have the knowledge and experience in
financial and business matters to be capable of evaluating the merits and risks
of the prospective investment in the Centra Shares, and the Stockholders are and
will be able to bear the economic risk of the investment in the Centra Shares.

         ss.2.12 Brokers or Finders

<PAGE>

         Except with respect to a possible claim by Aegis Bancorporation based
on its agreement with the Company, or a possible claim by Jerry Tyler, the
Stockholders will indemnify and hold the Purchaser harmless from any obligation
or liability, contingent or otherwise, for brokerage or finder's fees or agent's
commissions or other similar payment in connection with this Agreement alleged
to be due by or through the Stockholders as a result of the action of the
Company, or its officers or agents; provided, however, that the Purchaser will
pay Jerry Tyler ("Tyler") an agreed fee pursuant to an agreement between Tyler
and Purchaser relating to this transaction.

         ss.2.13 Questionable Payments

         To the knowledge of the Company and the Stockholders, neither the
Company, nor any director, officer, agent, employee, or other person associated
with or acting on behalf of the Company, or any Stockholder has, directly or
indirectly: used any corporate funds for unlawful contributions, gifts,
entertainment, or other unlawful expenses relating to political activity; made
any unlawful payment to foreign or domestic government officials or employees or
to foreign or domestic political parties or campaigns from corporate funds;
violated any provision of the Foreign Corrupt Practices Act of 1977, as amended;
established or maintained any unlawful or unrecorded fund of corporate monies or
other assets; made any false or fictitious entry on the books or records of the
Company; made any bribe, rebate, payoff, influence payment, kickback, or other
unlawful payment; given any favor or gift which is not deductible for federal
income tax purposes; or made any bribe, kickback, or other payment of a similar
or comparable nature, whether lawful or not, to any person or entity, private or
public, regardless of form, whether in money, property, or services, to obtain
favorable treatment in securing business or to obtain special concessions, or to
pay for favorable treatment for business secured or for special concessions
already obtained.

         ss.2.14 Completeness of Disclosure

         No representation or warranty by the Company or any Stockholder in this
Agreement and the Schedules and Exhibits hereto contains or on the Closing Date
will contain an untrue statement of material fact or omits or on the Closing
Date will omit to state a material fact required to be stated therein or
necessary to make the statements made therein not misleading. None of the
information supplied or to be supplied by the Company or a Stockholder for
inclusion specifically in any document to be filed with any regulatory authority
or governmental authority in connection with the Contemplated Transactions and
the financing thereof will be false or misleading with respect to any material
fact, or omit to state any material fact necessary in order to make the
statements therein not misleading or omit to state any material fact required to
be stated in order to correct any earlier misstatement. All writings for which
the Company or a Stockholder is responsible for filing with respect to the
Contemplated Transactions with any regulatory authority will comply as to form
with the provisions of applicable law and the applicable rules and regulations
thereunder.

III.     REPRESENTATIONS AND WARRANTIES OF THE PURCHASER

<PAGE>

         The Purchaser represents and warrants to the Stockholders as follows:

         ss.3.01 Organization

         The Purchaser is a corporation duly organized, validly existing, and in
good standing under the laws of Delaware, its jurisdiction of incorporation,
with all requisite power and authority to own, lease, license, and use its
properties and assets and to carry on the business in which it is now engaged
and in which it contemplates engaging.

         ss.3.02 Authority: No Conflict

                  (a) This Agreement constitutes the legal, valid, and binding
obligation of Purchaser, enforceable against Purchaser in accordance with its
terms. Upon the execution and delivery by Purchaser of all agreements
contemplated by this Agreement, (collectively, the "Purchaser's Closing
Documents"), the Purchaser's Closing Documents will constitute the legal, valid,
and binding obligations of Purchaser and enforceable (subject to applicable
bankruptcy, insolvency and other laws affecting the enforceability of creditors'
rights generally and equitable remedies) against Purchaser in accordance with
their respective terms. Purchaser has the absolute and unrestricted right,
power, and authority to execute and deliver this Agreement and the Purchaser's
Closing Documents and to perform its obligations under this Agreement and the
Purchaser's Closing Documents.

                  (b) Neither the execution and delivery of this Agreement, nor
the consummation or performance of any of the Contemplated Transactions, will
give any Person the right to prevent, delay, or otherwise interfere with any of
the transactions pursuant to:

                  (i)      any provision of Purchaser's organizational
                           documents;

                  (ii)     any resolution adopted by the Purchaser's board of
                           directors or Stockholders;

                  (iii)    any legal requirement or order to which Purchaser may
                           be subject; or

                  (iv)     any Contract to which Purchaser is a party or to
                           which the assets of Purchaser are subject.

         Except for those consents set forth in Schedules 2.07 and 2.08 which
are required to be obtained by the Company, Purchaser is not and will not be
required to obtain any other consent from any person in connection with the
execution and delivery of this Agreement or the consummation or performance of
any of the Contemplated Transactions.

         ss.3.03 Capitalization

         The Purchaser's authorized capital stock consists of 50,000,000 shares
of

<PAGE>

Common Stock, par value $.00001 per share ("Common Stock") of which 16,410,716
shares are issued and outstanding. Each of such outstanding shares is validly
authorized, validly issued, fully paid, and nonassessable, has not been issued
and is not owned or held in violation of any preemptive right.

         ss.3.04 Financial Condition

         The Purchaser will deliver to the Stockholders true and correct copies
of the following: audited balance sheet of Purchaser as of December 31, 2001 for
the fiscal year then ended; audited statement of income, statement of retained
earnings, and statement of cash flow of Purchaser for the fiscal year ended
December 31, 2001. Such balance sheet presents fairly the financial condition,
assets, liabilities, and stockholders' equity of Purchaser as of its date; such
statement of income and statement of retained earnings presents fairly the
results of operations of Purchaser for the period indicated; and such statement
of cash flow presents fairly the information purported to be shown therein. The
financial statements referred to in this Section 3.04 have been prepared in
accordance with generally accepted accounting principles consistently applied
throughout the periods involved and are in accordance with the Purchaser's books
and records. Since December 31, 2001:

         (a)      There has at no time been a material adverse change in the
                  financial condition, results of operations, business,
                  properties, assets, liabilities, or future prospects of
                  Purchaser.

         (b)      Purchaser has not authorized, declared, paid, or effected any
                  dividend or liquidating or other distribution in respect of
                  its capital stock or any direct or indirect redemption,
                  purchase, or other acquisition of any stock of Purchaser.

         (c)      The operations and business of Purchaser have been conducted
                  in all respects only in the ordinary course.

         (d)      There has been no accepted purchase order or quotation,
                  arrangement, or understanding for future sale of the products
                  or services of Purchaser except in the ordinary course of
                  business.

         (e)      Purchaser has not suffered an extraordinary loss (whether or
                  not covered by insurance) or waived any right of substantial
                  value.

         ss.3.05 Private Placement Memorandum

         The Purchaser has delivered to the Stockholders a copy of Purchaser's
Private Placement Memorandum dated June, 2002, which sets forth the disclosure
of certain information about the Purchaser.

         ss.3.06 Non-Distributive Intent

         The Purchaser is acquiring the Smith Shares for its own account (and
not for the account of others) for investment and not with a view to the
distribution thereof. The Purchaser will not sell or otherwise dispose of the
Smith Shares (whether pursuant to a liquidating dividend or otherwise) without
registration under the Securities Act or an

<PAGE>

exemption therefrom, and the certificate or certificates representing the Smith
Shares may contain a legend to the foregoing effect. By virtue of its position,
the Purchaser has access to the kind of financial and other information about
the Company as would be contained in a registration statement filed under the
Securities Act. The Purchaser understands that it may not sell or otherwise
dispose of the Smith Shares in the absence of either a registration statement
under the Securities Act or an exemption from the registration provisions of the
Securities Act.

         ss.3.07 Certain Proceedings

         There is no Proceeding pending or, to the knowledge of the Purchaser,
threatened against Purchaser and that challenges, or may have the effect of
preventing, delaying, making illegal, or otherwise interfering with, any of the
Contemplated Transactions.

         ss.3.08 Brokers or Finders

         Purchaser will indemnify and hold Stockholders and the Company harmless
from any obligation or liability, contingent or otherwise, for brokerage or
finder's fees or agent's commissions or other similar payment in connection with
this Agreement alleged to be due by or through Purchaser as a result of the
action of Purchaser or its officers or agents.

         ss.3.09 Compliance with Laws

         Purchaser is in compliance in all material respects with all applicable
laws and regulations.

         ss.3.10 Completeness of Disclosure

         No representation or warranty by the Purchaser in this Agreement
contains or on the Closing Date will contain an untrue statement of material
fact or omits or on the Closing Date will omit to state a material fact required
to be stated therein or necessary to make the statements made therein not
misleading. None of the information supplied or to be supplied by Purchaser for
inclusion in any document to be filed with any regulatory authority or
governmental authority in connection with the Contemplated Transactions will be
false or misleading with respect to any material fact, or omit to state any
material fact necessary in order to make the statements therein not misleading
or omit to state any material fact required to be stated in order to correct any
earlier misstatement. All writings for which Purchaser is responsible for filing
with respect to the Contemplated Transactions with any regulatory authority will
comply as to form with the provisions of applicable law and the applicable rules
and regulations thereunder.

         ss.3.11 Purchaser Due Diligence

         Purchaser has performed certain due diligence in connection with the
execution and delivery of this Agreement and has no knowledge of facts or
circumstances which, independently or in connection with other facts or
circumstances known to Purchaser, (i) would render any of the representations or
warranties of Stockholders or the Company

<PAGE>

herein to be untrue, inaccurate or incomplete in any material respect; (ii)
would render any of the covenants of Stockholders or the Company herein to be
incapable of performance; or (iii) would render any conditions to the
performance of any obligations hereunder incapable of fulfillment prior to the
Closing Date.

IV.      Exchange of the Smith Shares

         ss.4.01 Terms of the Exchange

         On the basis of the representations, warranties, covenants, and
agreements contained in this Agreement and subject to the terms and conditions
of this Agreement:

                  (a) At the Closing, each Stockholder shall, assign, transfer,
         and convey to the Purchaser and the Purchaser shall acquire from the
         Stockholder, the Stockholder's Respective Portion of the Smith Shares
         subject to the assignment, transfer and conveyance by all of the
         Stockholders of their Respective Portions of the Smith Shares, in
         consideration of the Stockholder's Respective Portion of the Centra
         Shares. Each Stockholder shall deliver at the Closing certificate or
         certificates representing the Stockholder's Respective Portion of the
         Smith Shares, duly endorsed in blank or accompanied by stock powers
         duly endorsed in blank, in each case in proper form for transfer, with
         signatures guaranteed by a commercial bank or a member firm of the New
         York Stock Exchange, Inc., and with all stock transfer and any other
         required documentary stamps affixed thereto.

                  (b) The number of Centra Shares to be exchanged for the Smith
         Shares shall consist of the Base Amount (as defined below) plus the
         agreement of Purchaser to deliver the Additional Shares as provided
         below. Each Stockholder shall be issued his Respective Portion of the
         Base Amount and Smith shall be issued the Additional Shares.

                    (A) The Base Amount shall be that number of Centra shares
               equal to $3 million dollars (based on a normalized EBITDA for the
               Company for the twelve months trailing September 2001 of
               $750,000; if the average EBITDA is less than $750,000 over this
               period from 10/1/2000 to 9/30/2001, then the Base Amount shall be
               adjusted accordingly). The EBITDA shall be determined based upon
               the normalization of audited financial statements of the Company
               at the end of the respective year-end.

                    (B) Subject to adjustment of the Base Amount as provided
               above, at the Closing Purchaser shall issue to each Stockholder
               his Respective Portion of the Base Amount, minus the sum of (i)
               the amount of the unfunded obligations of the Company as of the
               Closing Date under the Employee Benefit Plans of the Company for
               the benefit of the Stockholders (if any) and (ii) the amount of
               indebtedness of the Company immediately prior to the Closing for
               monies borrowed from, or advances made to or on behalf of the
               Company the Stockholders. The Purchaser shall deliver to each
               Stockholder a certificate registered in his name for his
               Respective Portion of the Centra Shares, rounded to
<PAGE>

         the nearest whole number (fractional shares will not be issued). The
         Centra Shares shall be valued at $2.50 per share to calculate the
         number of Centra Shares to be issued for the Base Amount.

                    (C) Additional Shares shall be issued to Smith and Chavez as
               follows:

                         (i) An amount equal to an increase in the Company's
                    accounts receivable on the Closing Date (compared to the
                    accounts receivable on the date hereof, subject to all
                    normal bad debt reserves, write-offs, etc in accordance with
                    GAAP and the Company's past practices consistently applied)
                    which amount increases the Company's net working capital to
                    a balance in excess of $250,000.00 on the Closing Date.
                    Purchaser will perform a post Closing audit within 120 days
                    after the Closing. Upon calculation of any increase in the
                    Centra Shares under this subsection (i), Purchaser will
                    issue to Smith and Chavez additional Centra Shares that
                    equal the excess working capital over $250,000.00; Centra
                    Shares shall be valued at $2.50 per share for this purpose.
                    The Centra Shares issued under this Section 4.1(b)(C)(i)
                    will be issued to Smith and Chavez according to their
                    Stockholder's s Respective Proportion.

                         (ii) An amount arrived at by multiplying by four the
                    difference between the Company's EBITDA for the first twelve
                    months following the Closing and the $750,000 base period
                    EBITDA ("Additional Shares"). The First 12 months EBITDA
                    shall be derived from the audited financial statements of
                    the Company, which shall be audited by Purchaser's certified
                    public accounts by no later than 120 days after the end of
                    the fiscal year. The number of Additional Shares shall be
                    determined as follows: if on the date such Additional Shares
                    are to be issued the Purchaser's shares of Common Stock
                    shall be listed for trading on a stock exchange or the
                    NASDAQ, then for purposes of determining the amount of
                    Centra Shares to be issued pursuant to this Additional
                    Payment provision, the Purchaser's Common Stock shall be
                    valued at the average closing trading price for the 30
                    consecutive prior trading days ending on the date that the
                    parties agreed to the audited financial statements.
                    Purchaser shall not be required to issue any fractional
                    shares in connection with any such Additional Shares. In the
                    event that any dispute regarding the First 12 Months EBITDA
                    is not resolved within 30 days following the delivery of
                    such audited financial statements, then all such disputes
                    shall be submitted to binding arbitration as provided in
                    Section 4.01(D). In the event future acquisitions, tuck-ins,
                    etc. cause this Additional Shares formula to become
                    incalculable, then Smith and Purchaser shall negotiate in
                    good faith the Centra Shares to be delivered under this
                    Section 4.01(C). The Additional Shares issued under this
                    Section 4.1(b)(C)(ii) will be issued to Smith only.

                    (D) In the event a dispute arises under this Agreement with
               respect to adjustments of the Base Amount or Additional Shares to
               be issued to the Stockholders, then such dispute shall be
               resolved by a single arbitrator under the commercial arbitration
               rules of the American Arbitration Association. The

<PAGE>

         arbitration shall take place in New York County, New York. The
         arbitrator, in his or her sole discretion, shall have authority to
         award the prevailing party or parties its or their attorneys' fees and
         costs, and all costs of arbitration, in whole or in part, in addition
         to resolution of the disputed matter.

         ss.4.02 The Closing

         The closing of the exchange of the Smith Shares (the "Closing") shall
take place at the offices of Reitler Brown LLC, 800 Third Avenue, 21st Floor,
New York, New York 10022, at 10:00 A.M., local time, on December__, 2002.
("Closing Date"). The Closing may occur at such different place, such different
time, or such different date or a combination thereof as the Purchaser and
Stockholders agree in writing. If the Closing has not occurred on or prior to
December 31, 2002, then the parties not at fault shall, in addition to all other
rights and remedies available at law or in equity against the defaulting
parties, have the right to cancel and terminate this Agreement.

         ss.4.03 Indemnity Against Liabilities

         Stockholders jointly and severally agree to indemnify and hold harmless
the Purchaser, the Company and their respective officers, directors, employees,
counsel, agents, and stockholders, in each case past, present, or as they may
exist at any time after the date of this Agreement, and each person, if any, who
controls, controlled, or will control any of them within the meaning of Section
15 of the Securities Act or Section 20(a) of the Securities Exchange Act of
1934, as amended (the "Exchange Act") (the "Indemnitees"), against any and all
losses, liabilities, damages, and expenses whatsoever (which shall include, for
all purposes of this Section 4.03 and Section 9.01, but not be limited to
counsel fees and any and all expenses whatsoever incurred in investigating,
preparing, or defending against any litigation, commenced or threatened, or any
claim whatsoever, and any and all amounts paid in settlement of any claim or
litigation) as and when incurred arising out of, based upon, or in connection
with any breach or alleged breach of any representation, warranty, covenant, or
agreement of the Company or any Stockholder contained in this Agreement and any
act, alleged act, omission, or alleged omission by a Stockholder or the Company
occurring at or prior to the Closing (including without limitation any which
arise out of, are based upon, or are in connection with any of the Contemplated
Transactions hereby). The foregoing agreement to indemnify shall be in addition
to any liability the Company or Stockholders may otherwise have, including
liabilities arising under this Agreement.

V.       COVENANTS AND AGREEMENTS OF THE COMPANY AND STOCKHOLDERS

         The Company and Stockholders covenant and agree as follows:

         ss.5.01 Access

                  (a) Until the earlier of the Closing and the abandonment or
termination of this Agreement pursuant to Article IV (the "Release Time"), the
Company will afford,

<PAGE>

and Stockholders will cause the Company to afford, the officers, employees,
counsel, agents, investment bankers, accountants, and other representatives of
the Purchaser and its lenders, investors, and prospective lenders or investors
free and full access to the plants, properties, books, and records of the
Company, will permit them to make extracts from and copies of such books and
records, and will from time to time furnish the Purchaser with such additional
financial and operating data and other information as to the financial
condition, results of operations, businesses, properties, assets, liabilities,
or future prospects of the Company as the Purchaser from time to time may
request. Until the Release Time, the Company and Stockholders will cause the
independent certified public accountants of the Company to make available to the
Purchaser and its independent certified public accountants the work papers
relating to the financial statements of the Company referred to in Section 2.04.

                  (b) Non-public information obtained by Purchaser in the course
of the investigation set forth above will be used solely for purposes of the
Contemplated Transactions and, in the event this Agreement terminates and the
Contemplated Transactions are not consummated, all information so obtained will
be returned to the Company. If such return is not possible or practicable under
the circumstances, all copies thereof, and all summaries or abstracts made
therefrom shall be destroyed or irretrievably erased from all storage media and
devices.

         ss.5.02 Conduct of Business

         Until the Closing, the Company will, and Stockholders will cause the
Company to, conduct its affairs so that at the Closing no representation or
warranty of the Company or any Stockholder will be inaccurate, no covenant or
agreement of the Company or any Stockholder will be breached, and no condition
in this Agreement will remain unfulfilled by reason of the actions or omissions
of the Company, or any Stockholder. Except as otherwise requested by the
Purchaser in writing, until the Closing or the Release Time, the Company will,
and Stockholders will cause the Company to, use its best efforts to preserve the
business operations of the Company intact, to keep available the services of its
present personnel, to preserve in full force and effect the contracts,
agreements, instruments, leases, licenses, arrangements, and understandings of
the Company, and to preserve the good will of its suppliers, customers, and
others having business relations with any of them. In furtherance of the
foregoing, the Company will, and Stockholders will cause the Company to, do the
following:

         (a)      Conduct its business in the ordinary course and do all things
                  reasonably necessary to preserve all rights and permits
                  necessary to conduct such business;

         (b)      Keep its assets in good operating condition and repair and
                  make all normal and necessary repairs, replacements, renewals
                  and improvements thereto and comply with the provisions of all
                  applicable leases so as to prevent any default or breach
                  thereunder;

         (c)      Collect its accounts receivable, pay its accounts payable and
                  manage its cash flow consistent with its normal business
                  practices;

<PAGE>

         (d)      Maintain its books, accounts and records in accordance with
                  the Company's practice;

         (e)      Comply in all material respects with all laws applicable to it
                  and all obligations by which it is bound;

         (f)      File when due all reports and returns required to be filed by
                  it by any governmental authority and pay or perform when due
                  all taxes, assessments and other liabilities and obligations
                  in accordance with their terms, except those which are
                  contested in good faith;

         (g)      Take all reasonable actions to maintain their respective
                  customer relationships and volume of service and sales
                  activity, vendor and supplier relationships, banking lines of
                  credit and relationships with its workforce and relationships
                  with its employees;

         (h)      Not make any dividends, redemptions, distributions or other
                  payments with respect to their respective shares of capital
                  stock; and

         (i)      Not sell or otherwise dispose of any of their respective
                  material assets (other than inventory in the ordinary course
                  of business) or encumber any property or incur any debt other
                  than trade payables, accrued expenses and working capital
                  financing in the ordinary course of business and consistent
                  with past practices.

         ss.5.03 Advice of Changes

         Until the Closing or the Release Time, the Company and Stockholders
will immediately advise the Purchaser in a detailed written notice of any fact
or occurrence or any pending or threatened occurrence of which any of them
obtains knowledge and which (if existing and known at the date of the execution
of this Agreement) would have been required to be set forth or disclosed in or
pursuant to this Agreement or an Exhibit hereto, which (if existing and known at
any time prior to or at the Closing) would make the performance by any party of
a covenant contained in this Agreement impossible or make such performance
materially more difficult than in the absence of such fact or occurrence, or
which (if existing and known at the time of the Closing) would cause a condition
to any party's obligations under this Agreement not to be fully satisfied.

         ss.5.04    Confidentiality

         The Company and Stockholders shall insure that all confidential
information which the Company, any of its officers, directors, employees,
counsel, agents, investment bankers, or accountants, or any Stockholder or his
counsel, agents, investment bankers, or accountants may now possess or may
hereafter create or obtain relating to the financial condition, results of
operations, business, properties, assets, liabilities, or future prospects of
the Company, or the Purchaser, any affiliate of any of them, or any customer or
supplier of any of them or any such affiliate shall not be published, disclosed,
or made accessible by any of them to any other person or entity at any time or
used by any of

<PAGE>

them except, pending the Closing, in the business and for the benefit of the
Company, in each case without the prior written consent of the Purchaser in each
instance; provided, however, that the restrictions of this sentence shall not
apply (a) with respect to the obligations of the Company after the Closing takes
place, (b) with respect to the obligations of all such persons and entities
after this Agreement which are rightfully terminated, but only to the extent
such confidential information relates to the financial condition, results of
operations, business, properties, assets, liabilities, or future prospects of
the Company, or any affiliate, or (insofar as such confidential information was
obtained directly by the Company, or any such affiliate from any customer or
supplier of any of them) of any such customer or supplier, (c) as may otherwise
be required by law, (d) as may be necessary or appropriate in connection with
the enforcement of this Agreement, (e) to disclosure by or on behalf of the
Purchaser to existing or prospective lenders or other investors or to others
whose consent may be required or desirable in connection with obtaining the
financing or consents which are required or desirable to consummate the
Contemplated Transactions, or (f) to the extent such information shall have
otherwise become publicly available. The Company and Stockholders shall, and
shall cause all other such persons and entities to, deliver to the Purchaser all
tangible evidence of such confidential information to which the restrictions of
the foregoing sentence apply at the Closing or the earlier rightful termination
of this Agreement.

         ss.5.05 Public Statements

         Neither the Company nor any Stockholder shall release any information
concerning this Agreement or the Contemplated Transactions which is intended for
or may result in public dissemination thereof, without the prior written consent
of the Purchaser. Nothing contained herein shall prevent the Company or any
Stockholder from releasing any information to any governmental authority if
required to do so by law.

         ss.5.06 Other Proposals

         Until the Release Time, the Company and Stockholders shall not, and
shall neither authorize nor permit any officer, director, employee, counsel,
agent, investment banker, accountant, or other representative of any of them,
directly or indirectly, to: (a) initiate contact with any person or entity in an
effort to solicit any Takeover Proposal (as such term is defined in this Section
5.06); (b) cooperate with, or furnish or cause to be furnished any non-public
information concerning the business, properties, or assets of the Company to,
any person or entity in connection with any Takeover Proposal; (c) negotiate
with any person or entity with respect to any Takeover Proposal; or (d) enter
into any agreement or understanding with the intent to effect a Takeover
Proposal. The Company and Stockholders will immediately give written notice to
the Purchaser of the details of any Takeover Proposal of which any of them
becomes aware. As used in this Section 5.06, "Takeover Proposal" shall mean any
proposal, other than as contemplated by this Agreement, for the purchase from
one or more of the Stockholders of any of the Smith Shares, a merger,
consolidation, reorganization, other business combination, or recapitalization
involving the Company, for the acquisition of any interest in the equity or in
any class or series of capital stock of the Company, for the acquisition of the
right to cast any of the votes on any matter with respect to the Company, or for
the acquisition of

<PAGE>

any of their respective assets other than in the ordinary course of their
respective businesses.

         ss.5.07 Consents Without Any Condition

         The Company and Stockholders shall not make any agreement or reach any
understanding not approved in writing by the Purchaser as a condition for
obtaining any consent, authorization, approval, order, license, certificate, or
permit required for the consummation of the Contemplated Transactions, whether
pursuant to Section 7.07, 7.08, or 7.09 or otherwise.

         ss.5.08 Release by Stockholders

         If the Closing takes place, effective immediately after the Closing,
each Stockholder fully and unconditionally releases and discharges all claims
and causes of action which he or his heirs, personal representatives,
successors, or assigns ever had, now have, or hereafter may have against the
Purchaser, the Company, and, when acting as such, their respective officers,
directors, employees, counsel, agents, and stockholders, in each case past,
present, or as they may exist at any time after the date of this Agreement, and
each person, if any, who controls, controlled, or will control any of them
within the meaning of Section 15 of the Securities Act or Section 20(a) of the
Exchange Act, except claims and causes of action arising out of, based upon, or
in connection with this Agreement. (including the Employment Agreement,
Stockholders Agreement and other documents delivered at the Closing or
subsequent to the Closing under the terms of this Agreement).

         ss.5.09 Noncompetition

         Smith agrees, in consideration of the obligations of the Purchaser
hereunder: (a) for a period of two (2) years after the Closing Date, he will not
(i) compete with or be engaged in the same business as, or Participate In (as
hereinafter defined in this Section 5.09) any other business or organization
which at any time during the two (2)-year period after the Closing Date competes
with or is engaged in the same business as, the Purchaser or any of its
subsidiaries, including the Company, with respect to any product or service sold
or activity engaged in up to the time of the Closing by the Company in any
geographical area in which at the time of the Closing such product or service is
sold or activity engaged in, or (ii) Participate In any other business or
organization which at any time during the two (2)-year period after the Closing
Date uses a name similar to or susceptible of confusion with the Company's name
or any combination or abbreviation thereof; (b) he will not directly or
indirectly reveal the name of, solicit or interfere with, or endeavor to entice
away from the Company, the Purchaser or any Subsidiary of the Purchaser, any of
their respective suppliers, customers, or employees; and (c) he will not
directly or indirectly employ any person who, at any time up to the Closing
Date, was an employee of the Company, the Purchaser, or any Subsidiary of the
Purchaser within a period of two (2) years after such person leaves the employ
of such corporation. As used in this Section 5.09, "Participate In" shall mean
"directly or indirectly, for his own benefit or for, with, or through any other
person or entity, own, manage, operate, control,

<PAGE>

loan money to, or participate in the ownership, management, operation, or
control of, or be connected as a director, officer, employee, partner,
consultant, agent, independent contractor, or otherwise with, or acquiesce in
the use of his name in." Smith agrees that the provisions of this Section 5.09
are necessary and reasonable to protect the Company, and the Purchaser in the
conduct of their businesses. If any restriction contained in this Section 5.09
shall be deemed to be invalid, illegal, or unenforceable by reason of the
extent, duration, or geographical scope thereof, or otherwise, then the court
making such determination shall have the right to reduce such extent, duration,
geographical scope, or other provisions hereof, and in its reduced form such
restriction shall then be enforceable in the manner contemplated hereby.

         ss.5.10 Voting by Stockholders

         The Company agrees that prior to the Release Time or the consummation
of the Closing it will not, and the Stockholders agree that they will cause the
Company not, to authorize, approve or effect, (a) any stock split, stock
dividend, or reverse stock split relating to any class or series of the
Company's stock, (b) any issuance of any shares of capital stock of the Company,
any option, warrant, or other right calling for the issuance of any such share
of capital stock, or any security convertible into or exchangeable for any such
share of capital stock, (c) any authorization of any other class or series of
stock of the Company, (d) any amendment of the certificate of incorporation (or
other charter document) or the by-laws of the Company or, or (e) any proposition
the effect of which may be to prohibit, restrict, or delay the consummation of
any of the transactions contemplated by this Agreement or impair the
contemplated benefits to the Purchaser of the Contemplated Transactions.

         ss.5.11 Employment Agreement

         The Company will, and the Stockholders will cause the Company to,
execute and deliver, effective with the Closing, an Employment Agreement with
Smith in the form of Exhibit A ("Employment Agreement").

         ss.5.12 Assumption of Liabilities

         The Stockholders shall execute and deliver to the Company and the
Purchaser at the Closing in such form as the Purchaser reasonably requests their
assumptions and undertakings to pay all of the following obligations of the
Company as of the Closing Date, to the extent not otherwise discharged as of
Closing Date as determined in accordance with GAAP:

         o        Uninsured product liability or environmental claims or actions
                  based on events or transactions before the Closing

         o        Uncollected or unpaid sales tax, FICA, Medicare or income tax
                  withholding

         o        Income taxes owed by the Company for years prior to the
                  Closing

         o        Undisclosed or contingent liabilities of the Company based on
                  events of transactions before Closing, including any
                  professional fees owed that are not

<PAGE>

                  pre-approved by Purchaser prior to Closing or declared
                  dividends payable as of the Closing Date.

VI.      COVENANTS AND AGREEMENTS OF THE PURCHASER

         The Purchaser covenants and agrees as follows:

         ss.6.01 Continuation of Employment

                  (a) The Purchaser shall not cause the Company to terminate
employees of the Company in violation of employment agreements existing at the
date hereof. The Purchaser agrees to cause the Company to honor and not
terminate or amend after the Closing the rights to indemnification of the
officers, directors and employees of the Company and the former officers,
directors and employees of the Company provided at the Closing Date by the
certificate of incorporation and by-laws of the Company or otherwise in
accordance with their terms; such agreement of the Purchaser, however, shall not
be deemed an obligation of Purchaser to satisfy such indemnification rights.

                  (b) Nothing contained in this Agreement or otherwise shall
obligate the Purchaser or the Company to employ any person who is now or in the
future may be employed by the Company, except as provided in the Employment
Agreements.

         ss.6.02 Advice of Changes

         Until the Closing or Release Time, Purchaser will immediately advise
the Stockholders in a detailed written notice of any fact or occurrence or any
pending or threatened occurrence of which Purchaser obtains knowledge and which
(if existing and known at the date of the execution of this Agreement) would
have been required to be set forth or disclosed in or pursuant to this Agreement
or an Exhibit hereto, which (if existing and known at any time prior to or at
the Closing) would make the performance by any party of a covenant contained in
this Agreement impractical or impossible or make such performance materially
more difficult than in the absence of such fact or occurrence, or which (if
existing and known at the time of the Closing) would cause a condition to any
party's obligations under this Agreement not to be fully satisfied.

         ss.6.03 Confidentiality

         Purchaser shall insure that all confidential information which
Purchaser, any of its officers, directors, employees, counsel, agents,
investment bankers, or accountants, may now possess or may hereafter create or
obtain relating to the financial condition, results of operations, business,
properties, assets, liabilities, or future prospects of the Company, any
affiliate, or any customer or supplier of any of them or any such affiliate
shall not be published, disclosed, or made accessible by any of them to any
other person or entity at any time or used by any of them except, pending the
Closing, in the business and for the benefit of the Company, in each case
without the prior written consent of the Stockholders; provided, however, that
the restrictions of this sentence shall not apply (a) with respect to the
obligations of Purchaser after the Closing, (b) with respect to the

<PAGE>

obligations of all such persons and entities after this Agreement is rightfully
terminated, but only to the extent such confidential information relates to the
financial condition, results of operations, business, properties, assets,
liabilities, or future prospects of the Company, of any affiliate of any of
them, or, insofar as such confidential information was obtained directly by
Purchaser from any customer or supplier of the Company, with respect to such
customer or supplier, (c) as may otherwise be required by law, (d) as may be
necessary or appropriate in connection with the enforcement of this Agreement,
or (e) to disclosure by or on behalf of the Purchaser to existing or prospective
lenders or other investors or to others whose consent may be required or
desirable in connection with obtaining the financing or consents which are
required or desirable to consummate the transactions contemplated by this
Agreement, or (f) to the extent such information shall have otherwise become
publicly available.

         ss.6.04 Notice of Breaches by Purchaser

         The Purchaser shall give to Stockholders promptly after becoming aware
of the occurrence or the pending occurrence of any event that would cause or
constitute a breach of any of Purchaser's, Stockholder's or the Company's
representations, warranties, covenants or agreements set forth in this Agreement
or that might result in the non-fulfillment of any condition to the consummation
of the transactions contemplated by this Agreement.

         ss.6.05 Regulatory Filings

         Purchaser shall provide Stockholders with copies of all
non-confidential portions of its applications, if any, to all regulatory
authorities at the time such applications are filed with such regulatory
authorities.

         ss.6.06 Bank/Institutional Indebtedness

         Purchaser at the Closing shall assume or replace the Company's
bank/institutional indebtedness of the Company for monies borrowed by or
advances made to or on behalf of the Company; (but not indebtedness owed to the
Stockholders for loans or advances, which will be canceled).

         ss.6.07 Consummation of Agreement

         Purchaser shall perform and fulfill all conditions and obligations on
its part to be performed or fulfilled by it under this Agreement and to cause
the Contemplated Transactions to be consummated as expeditiously as reasonably
practical.

         ss.6.08 Stockholders Agreement

         The Purchaser will execute and deliver the Stockholders Agreement.

VII.     CONDITIONS TO OBLIGATIONS OF THE PURCHASER

<PAGE>

         The obligations of the Purchaser under this Agreement are subject, at
the option of the Purchaser, to the following conditions:

         ss.7.01 Accuracy of Representations and Compliance with Conditions

         All representations and warranties of the Company or any Stockholder
contained in this Agreement shall be accurate when made and, in addition, shall
be accurate as of the Closing as though such representations and warranties were
then made in exactly the same language by the Company or such Stockholder as of
the Closing; the Company and Stockholders shall have performed and complied with
all covenants and agreements and satisfied all conditions required to be
performed and complied with by any of them at or before such time by this
Agreement; and the Purchaser shall have received certificates executed by the
chief executive officer and the chief financial officer of the Company and by
the Stockholders, dated the Closing Date, to that effect, substantially in the
form of Exhibits B and C, respectively.

         ss.7.02 Opinion of Counsel

         The Company and Stockholders shall have delivered to the Purchaser on
the Closing Date the opinion of Christopher M. Dietrich, Esq., counsel to the
Company and Smith, dated as of such date, substantially in the form attached
hereto as Exhibit D.

         ss.7.03 Other Closing Documents

         Stockholders shall have delivered or cause the Company to deliver to
the Purchaser at or prior to the Closing the Stockholders Agreement signed by
the Stockholders, the Employment Agreement signed by Smith and such other
documents (including certificates of officers of the Company or of any
Subsidiary) as the Purchaser may reasonably request in order to enable the
Purchaser to determine whether the conditions to its obligations under this
Agreement have been met and otherwise to carry out the provisions of this
Agreement.

         ss.7.04 Review of Proceedings

         All actions, proceedings, instruments, and documents required to carry
out this Agreement or incidental thereto and all other related legal matters
shall be subject to the reasonable approval of Reitler Brown LLC, counsel to the
Purchaser, and the Company and Stockholders shall have furnished such counsel
such documents as such counsel may have reasonably requested for the purpose of
enabling them to pass upon such matters.

         ss.7.05 Legal Action

         There shall not have been instituted or threatened any Proceeding
relating to, or seeking to prohibit or otherwise challenge the consummation of,
the transactions contemplated by this Agreement, or to obtain substantial
damages with respect thereto.

         ss.7.06 No Governmental Action

<PAGE>

         There shall not have been any action taken, or any law, rule,
regulation, order, judgment, or decree proposed, promulgated, enacted, entered,
enforced, or deemed applicable to the transactions contemplated by this
Agreement by any federal, state, local, or other governmental authority or by
any court or other tribunal, including the entry of a preliminary or permanent
injunction, which, in the sole judgment of the Purchaser, (a) makes any of the
transactions contemplated by this Agreement illegal, (b) results in a delay in
the ability of the Purchaser to consummate any of the Contemplated Transactions,
(c) requires the divestiture by the Purchaser of any of the Smith Shares or of a
material portion of the business of either the Purchaser and its subsidiaries
taken as a whole, or of the Company and the Subsidiaries taken as a whole, (d)
imposes material limitations on the ability of the Purchaser effectively to
exercise full rights of ownership of the Smith Shares including the right to
vote such shares on all matters properly presented to the stockholders of the
Company, or (e) otherwise prohibits, restricts, or delays consummation of any of
the transactions contemplated by this Agreement or impairs the contemplated
benefits to the Purchaser of any of the transactions contemplated by this
Agreement.

         ss.7.07 Governmental Approval

         The parties to this Agreement shall have obtained at or prior to the
Closing any required approval of any governmental agency having jurisdiction to
this Agreement and to the execution, delivery, and performance of this Agreement
by each of the parties.

         ss.7.08 Contractual Consents Needed

         The parties to this Agreement shall have obtained at or prior to the
Closing all consents required for the consummation of the Contemplated
Transactions from any party to any contract, agreement, instrument, lease,
license, arrangement, or understanding to which any of them is a party, or to
which any of them or any of their respective businesses, properties, or assets
are subject.

         ss.7.09 Other Agreements

         Other agreements to be signed after this Agreement is executed, but
before the Closing, shall have been duly authorized, executed, and delivered by
the parties thereto at or prior to the Closing, and as at the Closing shall be
in full force, valid, and binding upon the parties thereto, and shall (subject
to applicable bankruptcy, insolvency, and other laws affecting the
enforceability of creditors' rights generally) be enforceable by them in
accordance with their terms at the Closing, and no party thereto at any time
from the execution thereof until immediately after the Closing shall have been
in violation of or in default in complying with any material term thereof.

         ss.7.10 Insurance on Key Employees

         The Purchaser shall, at its expense, have obtained at or prior to the
Closing renewable term life insurance for the benefit of the Company on the life
of Smith in the face amount of $1 Million, with a reputable insurance company
and at rates then prevailing in California for healthy persons of the same sex
and age of the insured.

<PAGE>

         ss.7.11 Resignations

         All directors of the Company shall have resigned at or prior to the
Closing as directors and members of all committees of the Board of Directors in
writing effective immediately after the Closing. All officers of the Company
shall have resigned at or prior to the Closing in writing effective immediately
after the Closing subject to acceptance by the Purchaser.

         ss.7.12 Releases

         The Company shall have received at or prior to the Closing a release
from each person who is or who at any time during the one year period ending
with date of Agreement was, an officer or a director of the Company, dated the
Closing Date, substantially in the form of Exhibit E.

         ss.7.13 Officers' and Directors' Confidentiality and Noncompetition
         Agreement

         The Purchaser and the Company shall have received at or prior to the
Closing from each person who is, who before the Closing becomes, or who at any
time during the one year period ended on the date of this Agreement was, an
officer or a director of the Company, a confidentiality and non-competition
agreement substantially in the form of Exhibit F.

         ss.7.14 Condition of Property

         All risk of casualty or loss, or taking by eminent domain or
condemnation, prior to the Closing shall be borne by the Company and the
Stockholders. None of the assets and business of the Company, shall have been
destroyed, damaged or taken by condemnation or other governmental action. The
Company shall have operated its business, and preserved its assets, in a manner
complying with Section 7.02 and the Stockholders shall deliver a Certificate to
Purchaser dated the Closing Date confirming the same to the best of the
Stockholders' knowledge.

VIII.    CONDITIONS TO THE OBLIGATIONS OF THE COMPANY AND STOCKHOLDERS

         The obligations of the Company and Stockholders under this Agreement
are subject, at the option of the Company and Stockholders, to the following
conditions:

         ss.8.01 Accuracy of Representations and Compliance with Conditions

         All representations and warranties contained in this Agreement shall be
accurate when made and, in addition, shall be accurate as of the Closing as
though such representations and warranties were then made in exactly the same
language by Purchaser; as of the Closing Purchaser shall have performed and
complied with all covenants and agreements and satisfied all conditions required
to be performed and complied with by it at or before such time by this
Agreement; and the Stockholders shall

<PAGE>

have received a certificate executed by the chief executive officer of
Purchaser, dated the Closing Date, to that effect, substantially in the form of
Exhibit G.

         ss.8.02 Other Closing Documents

         Purchaser shall have delivered to the Stockholders prior to the Closing
such other documents as the Stockholders may reasonably request in order to
enable the Stockholders to determine whether the conditions to their obligations
under this Agreement have been met and otherwise to carry out the provisions of
this Agreement.

         ss.8.03 Review of Proceedings

         All actions, proceedings, instruments, and documents required to carry
out this Agreement or incidental thereto and all other related legal matters
shall be subject to the reasonable approval of Christopher M. Dietrich, Esq.,
counsel to the Company and Smith, and Purchaser shall have furnished such
counsel such documents as such counsel may have reasonably requested for the
purpose of enabling them to pass upon such matters.

         ss.8.04 Proceedings

         There shall not have been instituted or threatened any Proceeding
relating to, or seeking to prohibit or otherwise challenge the consummation of,
the Contemplated Transactions, or to obtain substantial damages with respect
thereto.

         ss.8.05 No Governmental Action

         There shall not have been any action taken, or any law, rule,
regulation, order, judgment, or decree proposed, promulgated, enacted, entered,
enforced, or deemed applicable to the transactions contemplated by this
Agreement by any federal, state, local, or other governmental authority or by
any court or other tribunal, including the entry of a preliminary or permanent
injunction, which, in the sole judgment of the Stockholders, (a) makes any of
the transactions contemplated by this Agreement illegal, (b) results in a delay
in the ability of the Stockholders to consummate any of the transactions
contemplated by this Agreement, or (c) otherwise prohibits, restricts, or delays
consummation of any of the Contemplated Transactions or impairs the contemplated
benefits to the Stockholders of any of the Contemplated Transactions.

         ss.8.06 Governmental Approval

         The parties to this Agreement shall have obtained at or prior to the
Closing any required approval of any governmental agency having jurisdiction to
this Agreement and to the execution, delivery, and performance of this Agreement
by each of the parties.

         ss.8.07 Contractual Consents Needed

         The parties to this Agreement shall have obtained at or prior to the
Closing all consents required for the consummation of the Contemplated
Transactions from any

<PAGE>

party to any contract, agreement, instrument, lease, license, arrangement, or
understanding to which the Purchaser is a party, or to which it or any of its
business, properties, or assets are subject.

         ss.8.08 Employment Agreement and Stockholders Agreement

         The Employment Agreement and Stockholders Agreement shall have been
signed by the Company.

IX.      MISCELLANEOUS

         ss.9.01 Brokerage Fees

         Except with respect to a possible claim by Aegis Bancorporation based
on its agreement with the Company, or a possible claim by Tyler, if any person
shall assert a claim to a fee, commission, or other compensation on account of
alleged employment as a broker or finder on behalf of the Company or the
Stockholders, or alleged performance of services as a broker or finder, in
connection with or as a result of any of the transactions contemplated by this
Agreement, Stockholders shall (subject to the next sentence) indemnify and hold
harmless the Purchaser against any and all losses, liabilities, claims, damages,
and expenses whatsoever (as defined in Section 4.03) as and when incurred
arising out of, based upon, or in connection with such claim by such person, and
Stockholders shall at their sole expense defend any and all suits, actions,
proceedings (formal or informal), or investigations involving such claim that
may at any time be brought against the Purchaser and satisfy promptly any
settlement or judgment arising therefrom; but if Stockholders fail to defend
such suit, action, proceeding, or investigation in a timely manner, the
Purchaser or any Indemnitee made a defendant therein or a party thereto shall
have the right to defend and settle the same and pay any judgment or settlement
pertaining thereto as it or he may reasonably deem appropriate at the cost and
expense of Stockholders. If, however, such a claim is made by Aegis
Bancorporation against the Stockholders, Purchaser shall indemnify and hold
harmless the Stockholders against any and all losses, liabilities, claims,
damages, and expenses whatsoever (as defined in Section4.03) as and when
incurred arising out of, based upon, or in connection with such claim by such
person, and the Purchaser shall at its sole expense defend any and all suits,
actions, proceedings (formal or informal), or investigations involving such
claim that may at any time be brought against the Stockholders and satisfy
promptly any settlement or judgment arising therefrom; but if Purchaser fails to
defend such suit, action, proceeding, or investigation in a timely manner, the
Stockholders made a defendant therein or a party thereto as it or he may
reasonably deem appropriate at the cost and expense of Purchaser.

         ss.9.02 Expenses

         Except as otherwise expressly provided in this Agreement, each party to
this Agreement will bear its respective expenses incurred in connection with the
preparation, execution, and performance of this Agreement and the Contemplated
Transactions, including all fees and expenses of agents, representatives,
counsel, and accountants.
<PAGE>

         ss.9.03 Further Actions

         At any time and from time to time, each party agrees, at its or his
expense, to take such actions and to execute and deliver such documents as may
be reasonably necessary to effectuate the purposes of this Agreement.

         ss.9.04 Availability of Equitable Remedies

         Since a breach of the provisions of this Agreement could not adequately
be compensated by money damages, any party shall be entitled, either before or
after the Closing, in addition to any other right or remedy available to it, to
an injunction restraining such breach or a threatened breach and to specific
performance of any such provision of this Agreement, and in either case no bond
or other security shall be required in connection therewith, and the parties
hereby consent to the issuance of such an injunction and to the ordering of
specific performance.

         ss.9.05 Survival

         The covenants, agreements, representations, and warranties contained in
or made pursuant to this Agreement shall survive the Closing and the delivery of
the Smith Shares to the Purchaser, irrespective of any investigation made by or
on behalf of any party. The statements contained in the Stockholders Agreement
and the Employment Agreement, or in any other document executed by the Company,
or any Stockholder relating hereto or delivered to the Purchaser in connection
with the Contemplated Transactions or in any statement, certificate, or other
instrument delivered by or on behalf of the Company, or any Stockholder pursuant
hereto or thereto or delivered to the Purchaser in connection with the
Contemplated Transactions shall be deemed representations and warranties,
covenants and agreements, or conditions, as the case may be, of the Stockholders
hereunder for all purposes of this Agreement (including all statements,
certificates, or other instruments delivered pursuant hereto or thereto or
delivered in connection with the Contemplated Transactions).

         ss.9.06 Appointment of Agent

         Smith is hereby appointed as the representative (the "Representative")
of the interests of Stockholders for all purposes of this Agreement. Without
giving notice to Stockholders, the Representative shall have full and
irrevocable authority on behalf of Stockholders (a) to deal with the other
parties to this Agreement, (b) to accept and distribute the amounts payable to
the Stockholders, (c) to accept and give notices and other communications
relating to this Agreement, (d) to settle any dispute relating to the terms of
this Agreement, (e) to waive any condition to the obligations of Stockholders
found in this Agreement, (f) to modify or amend this Agreement (except with
respect to the Purchase Price to be received by a Stockholder), (g) to execute
any instrument or document that the Representative may determine is necessary or
desirable in the exercise of his authority under this Section 9.06, and (h) to
act in connection with all matters arising out of, based upon, or in connection
with this Agreement and the transactions contemplated hereby or thereby. In the
event of the refusal or inability to serve, death, incapacity, or resignation
for any reason of the Representative, Richard Kerr will become

<PAGE>

his successor, with all the powers and irrevocable authority of the
Representative, and with full power of substitution.

         ss.9.07 Modification

         This Agreement and the Exhibits hereto set forth the entire
understanding of the parties with respect to the subject matter hereof (except
as provided in Section 9.06), supersede all existing agreements among them
concerning such subject matter, and may be modified only by a written instrument
duly executed by each party (except as otherwise provided in Section 9.06).

         ss.9.08 Notices

         Subject to Section 9.06, any notice or other communication required or
permitted to be given hereunder shall be in writing and shall be (i) mailed by
certified mail, return receipt requested (ii) delivered or by Federal Express,
Express Mail, or similar overnight delivery or courier service, (iii) delivered
in person or (iv) delivered by telecopy, telex, or similar telecommunications
equipment with a confirmation copy sent by First Class Mail to the party to whom
it is to be given at the address of such party set forth in the preamble to this
Agreement (or to such other address as the party shall have furnished in writing
in accordance with the provisions of this Section 9.08) with a copy to each of
the other parties hereto. Any notice given to any corporate party shall be
addressed to the attention of the Corporate Secretary. Notice to the estate of
any party shall be sufficient if addressed to the party as provided in this
Section 9.08. Any notice or other communication given by certified mail (or by
such comparable method) shall be deemed given at the time of certification
thereof (or comparable act), except for a notice changing a party's address
which will be deemed given at the time of receipt thereof. Any notice given by
other means permitted by this Section 9.08 shall be deemed given at the time of
receipt thereof.

         ss.9.09 Waiver

         Any waiver by any party of a breach of any term of this Agreement shall
not operate as or be construed to be a waiver of any other breach of that term
or of any breach of any other term of this Agreement. The failure of a party to
insist upon strict adherence to any term of this Agreement on one or more
occasions will not be considered a waiver or deprive that party of the right
thereafter to insist upon strict adherence to that term or any other term of
this Agreement. Any waiver must be in writing duly signed by the waiving party.

         ss.9.10 Joint and Several Obligations

         The representations, warranties, covenants, and agreements of
Stockholders in this Agreement are joint and several, but no Stockholder shall
have any rights against the Company if a remedy is sought or obtained against
any Stockholder because both the Company and one or more Stockholders have
breached a representation, warranty, covenant, or agreement.
<PAGE>

         ss.9.11 Binding Effect

         The provisions of this Agreement shall be binding upon and inure to the
benefit of the Company and the Purchaser and their respective successors and
assigns and each Stockholder and his assigns, heirs, and personal
representatives, and shall inure to the benefit of each Indemnitee and its
successors and assigns (if not a natural person) and his assigns, heirs, and
personal representatives (if a natural person).

         ss.9.12 No Third Party Beneficiaries

         This Agreement does not create, and shall not be construed as creating,
any rights enforceable by any person not a party to this Agreement (except as
provided in Sections 5.04, 5.09 and 9.11).

         ss.9.13 Separability

         If any provision of this Agreement is invalid, illegal, or
unenforceable, the balance of this Agreement shall remain in effect, and if any
provision is inapplicable to any person or circumstance, it shall nevertheless
remain applicable to all other persons and circumstances.

         ss.9.14 Headings

         The headings in this Agreement are solely for convenience of reference
and shall be given no effect in the construction or interpretation of this
Agreement.

         ss.9.15 Counterparts; Governing Law

         This Agreement may be executed in any number of counterparts, each of
which shall be deemed an original, but all of which together shall constitute
one and the same instrument. It shall be governed by and construed in accordance
with the laws of the State of Delaware, without giving effect to conflict of
laws. Any action, suit, or proceeding arising out of, based on, or in connection
with this Agreement or the transactions contemplated hereby may be brought only
in the United States District Court for Delaware or if federal jurisdiction is
not available, in the Superior Court or Court of Chancery of Delaware and each
party covenants and agrees not to assert, by way of motion, as a defense, or
otherwise in any such action, suit, or proceeding, any claim that it or he is
not subject personally to the jurisdiction of such court, that its or his
property is exempt or immune from attachment or execution, that the action,
suit, or proceeding is brought in an inconvenient forum, that the venue of the
action, suit, or proceeding is improper, or that this Agreement or the subject
matter hereof may not be enforced in or by such court.

         ss.9.16 No Assignment

         This Agreement may not be assigned by any party, in whole or in part,
without the prior written consent of the other parties except that the Purchaser
may assign this Agreement and its rights and obligations hereunder in connection
with a transaction

<PAGE>

whereby it is merged with, or acquired by, a third-party without regard to the
form of any such acquisition.

<PAGE>

IN WITNESS WHEREOF, the parties have duly executed this Agreement as of the date
first written above.

                                        CENTRA INDUSTRIES, INC.

                                        By /s/ Gary Fuchs
                                          ----------------------------
                                                Gary Fuchs, CEO

                                        Smith & Co. Surveying Services, Inc.

                                        By /s/ Gregory J. Smith
                                          ----------------------------
                                           Gregory J. Smith
                                           President

                                        Stockholders:

                                        /s/ Gregory J. Smith
                                        ------------------------------
                                               Gregory J. Smith

                                        /s/  Paul K. Chavez
                                        ------------------------------
                                                Paul K. Chavez<PAGE>

                                                                  Execution Copy

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

                            ASSET PURCHASE AGREEMENT

                                     BETWEEN

                             CENTRA INDUSTRIES, INC.

                                       AND

                             TWS INTERNATIONAL, INC.

                                JANUARY 30, 2003

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

<PAGE>

                            ASSET PURCHASE AGREEMENT

         THIS ASSET PURCHASE AGREEMENT, dated as of January 30, 2003 (this
"Agreement"), is made and entered into by and between Centra Industries, Inc., a
Delaware corporation (the "Buyer") and TWS International, Inc., a Delaware
corporation (the "Seller"). The Buyer and the Seller are referred to
collectively herein as the "Parties."

                                   WITNESSETH:

         WHEREAS, this Agreement contemplates a transaction in which the Buyer
will purchase the business and assets of the Seller as a going concern (and
assume certain liabilities).

         NOW, THEREFORE, in consideration of the premises and the mutual
promises herein made, and in consideration of the representations, warranties,
and covenants herein contained, the Parties agree as follows:

         1.       Definitions.

         "Acquired Assets" means all right, title, and interest in and to all of
the assets of the Seller, including all of its: (a) tangible personal property
(such as machinery, equipment, inventories of raw materials and supplies,
manufactured and purchased parts, goods in process and finished goods,
furniture, trucks, tractors, trailers, other vehicles (excluding leased
vehicles), tools, jigs, and dies); (b) Intellectual Property, goodwill
associated therewith, licenses and sublicenses granted and obtained with respect
thereto, and rights thereunder, remedies against infringements thereof, and
rights to protection of interests therein under the laws of all jurisdictions;
(c) agreements, contracts, Security Interests, guarantees, other similar
arrangements, other than insurance policies, and rights thereunder; (d)
franchises, approvals, permits, licenses, orders, registrations, certificates,
variances, and similar rights obtained from governments and governmental
agencies; (e) books, records, ledgers, files, documents, correspondence, lists,
studies, reports, and other printed or written materials; (f) prepaid expenses;
and (g) all accounts, deposits and prepayments, receivables and Cash relating to
contracts assigned to Buyer and for work not performed prior to the Closing;
provided, however, that the Acquired Assets shall not include and the Seller
shall retain: (i) the corporate charter, qualifications to conduct business as a
foreign corporation, arrangements with registered agents relating to foreign
qualifications, taxpayer and other identification numbers, seals, minute books,
stock transfer books, blank stock certificates, and other documents relating to
the organization, maintenance, and existence of the Seller as a corporation;
(ii) any of the rights of the Seller under this Agreement; (iii) Cash earned for
work performed prior to the Closing; (iv) the acknowledgement of indebtedness
agreements issued by TWS do Brasil Ltda. in favor of the Seller in the aggregate
principal amount of 2,164,000 Brazilian Reais (the "TWS Brasil Note"); (v)
accounts, notes and other receivables for work performed prior to the Closing
(but excluding the TWS Brasil Note and subtracting from those amounts the
principal balance of the TWS Brasil Note, if the balance is included in such
amounts); (vi) deposits, other than advances for work not performed prior to the
Closing; (vii) insurance policies, claims or proceeds; (viii) income tax refunds
or claims; (ix) checkbooks, tax returns, or bank accounts; (x) accounts
receivable due from employees; (xi) the name "TWS International, Inc"; and (xii)
all capital stock in subsidiaries and Affiliates owned by the Seller.

         "Adverse Consequences" means all actions, suits, proceedings, hearings,
investigations, charges, complaints, claims, demands, injunctions, judgments,
orders, decrees, rulings, damages, dues, penalties, fines, costs, amounts paid
in settlement, Liabilities, obligations, Taxes, liens, losses, expenses and
fees, including court costs and reasonable attorneys' fees and expenses.

<PAGE>

         "Affiliate" has the meaning set forth in Rule 12b-2 of the regulations
promulgated under the Securities Exchange Act of 1934, as amended.

         "Applicable Rate" means the corporate base rate of interest publicly
announced from time to time by Citibank, N.A., plus 3% per annum.

         "Assumed Liabilities" means all obligations of the Seller under the
agreements, contracts, leases, licenses, and other arrangements referred to in
the definition of Acquired Assets either (i) to furnish goods, services, and
other non-Cash benefits to another party after the Closing or (ii) to pay for
goods, services, and other non-Cash benefits that another party will furnish to
it after the Closing; provided, however, that the Assumed Liabilities shall not
include any Excluded Liability or any other Liability of the Seller not
specifically included in this definition.

         "Basis" means any past or present fact, situation, circumstance,
status, condition, activity, practice, plan, occurrence, event, incident,
action, failure to act, or transaction that forms or could form the basis for
any specified consequence.

         "Buyer" has the meaning set forth in the preface above.

         "Buyer's Disclosure Statement" means the disclosure statement attached
as Exhibit A to this Agreement.

         "Cash" means cash and cash equivalents (including marketable securities
and short term investments).

         "Closing" has the meaning set forth in Section 2(d) below.

         "Code" means the Internal Revenue Code of 1986, as amended.

         "Environmental, Health, and Safety Requirement" shall mean all federal,
state, local and foreign statutes, regulations, ordinances and other provisions
having the force or effect of law, all judicial and administrative orders and
determinations and all common law concerning public health and safety, worker
health and safety, and pollution or protection of the environment, including
without limitation all those relating to the presence, use, production,
generation, handling, transportation, treatment, storage, disposal,
distribution, labeling, testing, processing, discharge, release, threatened
release, control, or cleanup of any hazardous materials, substances or wastes,
chemical substances or mixtures, pesticides, pollutants, contaminants, toxic
chemicals, petroleum products or byproducts, asbestos, polychlorinated
biphenyls, noise or radiation, each as amended and as in effect on the Closing
Date.

         "Excluded Liabilities" means any Liability or other obligation of the
Seller (i) set forth on the face of the Most Recent Balance Sheet (rather than
in any notes thereto), (ii) which has arisen after the Most Recent Fiscal Month
End, (iii) for costs and expenses incurred in connection with this Agreement and
the transactions contemplated hereby, (iv) any Tax or penalties due in respect
of income Tax withholding, FICA or Medicare; (v) owed to TWS do Brasil or any
other Affiliate of Seller, whether or not incurred in the Ordinary Course of
Business, including, without limitation, any loans, interest thereon or any
other amounts payable by Seller to any stockholder or any Affiliate thereof;
(vi) arising out of or in connection with any employee benefit plan, including
unfunded pension obligations or retiree medical benefits; (vii) for workers'
compensation (both long-term and short-term) benefits, whether insured or
self-insured, to the extent accruing or based upon exposure to conditions prior
to the Closing Date or for claims incurred or for disabilities commencing prior
to the Closing Date; (viii) arising out of or in connection with any insurance
policy maintained by Seller; (ix) arising out of or in connection with any

                                       2
<PAGE>

litigation pending on or prior to the Closing to which Seller is a party; (x)
Taxes owed by the Seller for periods prior to the Closing; (xi) product
liability or environmental claims or actions based on events or transactions
before the Closing; (xii) undisclosed or contingent Liabilities of the Seller,
based on events or transactions before the Closing; (xiii) amounts due as
refunds or adjustments on contracts performed prior to the Closing; (xiv)
deposits or prepayments for work not performed prior to the Closing which are
not transferred to the Buyer; and (xv) any Liability not specifically included
in the definition of "Assumed Liabilities".

         "Financial Statements" has the meaning set forth in Section 3(g) below.

         "GAAP" means United States generally accepted accounting principles as
in effect from time to time.

         "Hart-Scott-Rodino Act" means the Hart-Scott-Rodino Antitrust
Improvements Act of 1976, as amended.

         "Indemnified Party" has the meaning set forth in Section 9(d) below.

         "Indemnifying Party" has the meaning set forth in Section 9(d) below.

         "Intellectual Property" means: (a) all inventions (whether patentable
or unpatentable and whether or not reduced to practice), all improvements
thereto, and all patents, patent applications and patent disclosures, together
with all reissuances, continuations, continuations-in-part, revisions,
extensions, and reexaminations thereof; (b) all trademarks, service marks, trade
dress, logos, trade names, brands, brand names, and corporate names (but
excluding, as it relates to the Seller, the corporate name "TWS International,
Inc."), together with all translations, adaptations, derivations and
combinations thereof and including all goodwill associated therewith, and all
applications, registrations and renewals in connection therewith; (c) all
copyrightable works, all copyrights, and all applications, registrations, and
renewals in connection therewith; (d) all mask works and all applications,
registrations, and renewals in connection therewith; (e) all trade secrets and
confidential business information (including ideas, research and development,
know-how, formulas, compositions, manufacturing and production processes and
techniques, technical data, designs, drawings, specifications, customer and
supplier lists, pricing and cost information, and business and marketing plans
and proposals); (f) all computer software (including data and related
documentation); (g) all other proprietary rights; and (h) all copies and
tangible embodiments thereof (in whatever form or medium).

         "Knowledge" means actual knowledge after reasonable investigation.

         "Liability" means any liability (whether known or unknown, whether
asserted or unasserted, whether absolute or contingent, whether accrued or
unaccrued, whether liquidated or unliquidated, and whether due or to become
due), including any Liability for Taxes.

         "License Agreement" means the form of license agreement attached as
Exhibit B.

         "Major Customers and Suppliers" has the meaning set forth in Section
3(s).

         "Material Adverse Effect" means any change, effect, event, occurrence
or state of facts that is or could reasonably be expected to be materially
adverse to the Party or to the properties (including intangible assets),
financial condition or results of operations of the Party or on the ability of
the Party to consummate the transactions contemplated by, or to perform its
obligations under, this Agreement. For purposes of this Agreement, the term
"Material Adverse Effect" shall include any change, effect, event,

                                       3
<PAGE>

occurrence or state of facts that would or could reasonably be expected to
result in a change of $50,000 or more in the value of the Party or in the annual
operating income of the Party before interest, taxes and amortization.

         "Most Recent Balance Sheet" means the balance sheet contained within
the Most Recent Financial Statements.

         "Most Recent Financial Statements" has the meaning set forth in Section
3(g) below.

         "Most Recent Fiscal Month End" has the meaning set forth in Section
3(g) below.

         "Most Recent Fiscal Year End" has the meaning set forth in Section 3(g)
below.

         "Ordinary Course of Business" means the ordinary course of business
consistent with past custom and practice.

         "Party" has the meaning set forth in the preface above.

         "Person" means an individual, a partnership, a limited liability
partnership, a corporation, a limited liability company, an association, a joint
stock company, a trust, a joint venture, an unincorporated organization, or a
governmental entity (or any department, agency, or political subdivision
thereof).

         "Purchase Price" has the meaning set forth in Section 2(c) below.

         "RAKO" means RAKO Capital Corporation, a Nevada corporation.

         "Registration Rights Agreement" means the form of agreement attached as
Exhibit C.

         "Security Interest" means any mortgage, pledge, lien, encumbrance,
charge, or other security interest, other than (a) mechanic's, materialmen's,
and similar liens, (b) liens for Taxes not yet due and payable or for Taxes that
the taxpayer is contesting in good faith through appropriate proceedings, (c)
purchase money liens and liens securing rental payments under capital lease
arrangements, and (d) other liens arising in the Ordinary Course of Business and
not incurred in connection with the borrowing of money.

         "Seller" has the meaning set forth in the preamble above.

         "Seller's Disclosure Schedule" means the disclosure schedule attached
as Exhibit D to this Agreement.

         "Stockholders Agreement" means the Buyer's Stockholders Agreement, a
copy of which is attached as Exhibit E.

         "Subsidiary" means any corporation with respect to which a specified
Person (or a Subsidiary thereof) owns a majority of the common stock or has the
power to vote or direct the voting of sufficient securities to elect a majority
of the directors of the Subsidiary.

         "Tax" means any federal, state, or foreign income, gross receipts,
license, payroll, employment, excise, severance, stamp, occupation, premium,
windfall profits, environmental (including taxes under Code Section 59A),
customs duties, capital stock, franchise, profits, withholding, FICA, Medicare,
unemployment, disability, real property, personal property, sales, use,
transfer, registration, value added,

                                       4
<PAGE>

alternative or add-on minimum, estimated, or other tax of any kind whatsoever,
including any interest, penalty, or addition thereto, whether disputed or not.

         "Tax Return" means any return, declaration, report, claim for refund,
or information return or statement relating to Taxes, including any schedule or
attachment thereto, and including any amendment thereof.

         "Third Party Claim" has the meaning set forth in Section 9(d) below.

         2. Basic Transaction.

         (a) Purchase and Sale of Assets. On and subject to the terms and
conditions of this Agreement, the Buyer agrees to purchase from the Seller, and
the Seller agrees to sell, transfer, convey and deliver to the Buyer, all of the
Acquired Assets at the Closing for the consideration specified below in this
Section 2.

         (b) Assumption of Liabilities. On and subject to the terms and
conditions of this Agreement, the Buyer agrees to assume and become responsible
for all of the Assumed Liabilities at the Closing. The Buyer will not assume or
have any responsibility, however, with respect to any Excluded Liability or any
other obligation or Liability of the Seller not specifically included within the
definition of Assumed Liabilities.

         (c) Purchase Price. Subject to adjustment as provided in Exhibit F,
Buyer agrees to deliver to the Seller at the Closing shares of Buyer's Common
Stock, par value $.00001 per share, calculated according to Exhibit F attached
hereto, but not to exceed four million four hundred sixteen thousand nine
hundred twenty-four (4,416,924) shares (the "Centra Shares") (the "Purchase
Price").

         (d) The Closing. The closing of the transactions contemplated by this
Agreement (the "Closing") shall take place at the offices of Reitler Brown LLC,
800 Third Avenue, 21st Floor, New York, New York 10022, commencing at 10:00 a.m.
local time on the second business day following the satisfaction or waiver of
all conditions to the obligations of the Parties to consummate the transactions
contemplated hereby (other than conditions with respect to actions the
respective Parties will take at the Closing itself) or such other date as the
Parties may mutually determine (the "Closing Date").

         (e) Deliveries at the Closing. At the Closing, (i) the Seller will
deliver to the Buyer the various certificates, instruments, and documents
referred to in Section 6(a) below; (ii) the Buyer will deliver to the Seller the
various certificates, instruments, and documents referred to in Section 6(b)
below; (iii) the Seller will execute, acknowledge (if appropriate), and deliver
to the Buyer assignments (including Intellectual Property transfer documents)
and such other instruments of sale, transfer, conveyance, and assignment as the
Buyer and its counsel reasonably may request; (iv) the Buyer will execute,
acknowledge (if appropriate), and deliver to the Seller an assumption and such
other instruments of assumption as the Seller and its counsel reasonably may
request; and (v) the Buyer will deliver to the Seller the Centra Shares
specified in Section 2(c) above.

         (f) Allocation. The Parties agree to allocate the Purchase Price (and
all other capitalizable costs) among the Acquired Assets for all purposes
(including financial accounting and tax purposes) in accordance with the
allocation schedule attached hereto as Exhibit G. Any adjustment to the Purchase
Price shall be allocated as provided by Temp. Treas. Reg.ss.1.1060-1T(f).

         3. Representations and Warranties of the Seller. The Seller represents
and warrants to the Buyer that the statements contained in this Section 3 are
correct and complete as of the date of this

                                       5
<PAGE>

Agreement and will be correct and complete as of the Closing Date (as though
made then and as though the Closing Date were substituted for the date of this
Agreement throughout this Section 3), except as set forth in the Seller's
Disclosure Schedule.

         (a) Organization of the Seller. The Seller is a corporation duly
organized, validly existing and in good standing under the laws of the State of
Delaware.

         (b) Authorization of Transaction. The Seller has full power and
authority (including full corporate power and authority) to execute and deliver
this Agreement and to perform its obligations hereunder. Without limiting the
generality of the foregoing, the Board of Directors and the Seller's
stockholders have duly authorized the execution, delivery, and performance of
this Agreement by the Seller. This Agreement constitutes the valid and legally
binding obligation of the Seller, enforceable in accordance with its terms and
conditions, except as such enforceability may be (i) limited by bankruptcy,
insolvency, reorganization, liquidation, moratorium or other similar laws
affecting the rights and remedies of creditors generally and (ii) subject to
general principles of equity (regardless of whether such enforceability is
considered in a proceeding in equity or at law).

         (c) Noncontravention. Except as set forth in Section 3(c) of the
Seller's Disclosure Schedule, neither the execution and the delivery of this
Agreement, nor the consummation of the transactions contemplated hereby
(including the assignments and assumptions referred to in Section 2 above), will
(i) violate any constitution, statute, regulation, rule, injunction, judgment,
order, decree, ruling, charge, or other restriction of any government,
governmental agency, or court to which the Seller is subject or any provision of
the charter or bylaws of any of the Seller and its Subsidiaries or (ii) conflict
with, result in a breach of, constitute a default under, result in the
acceleration of, create in any party the right to accelerate, terminate, modify,
or cancel, or require any notice under any agreement, contract, lease, license,
instrument, or other arrangement to which the Seller is a party or by which it
is bound or to which any of its assets is subject (or result in the imposition
of any Security Interest upon any of its assets), which conflict, breach,
default or acceleration could have a Material Adverse Effect. The Seller does
not need to give any notice to, make any filing with, or obtain any
authorization, consent, or approval of any government or governmental agency in
order for the Parties to consummate the transactions contemplated by this
Agreement (including the assignments and assumptions referred to in Section 2
above).

         (d) Brokers' Fees. Except as set forth in Section 3(d) of the Seller's
Disclosure Schedule, the Seller has no Liability or obligation to pay any fees
or commissions to any broker, finder, or agent with respect to the transactions
contemplated by this Agreement for which the Buyer could become liable or
obligated.

         (e) Title to Assets. The Seller has good and marketable title to, or a
valid leasehold interest in, all material properties and assets used by it,
located on its premises, or shown on the Seller's Most Recent Balance Sheet or
acquired after the date thereof, free and clear of all Security Interests,
except for properties and assets disposed of in the Ordinary Course of Business
since the date of the Seller's Most Recent Balance Sheet. Without limiting the
generality of the foregoing, the Seller has good and marketable title to all of
the Acquired Assets, free and clear of any Security Interest or restriction on
transfer.

         (f) Subsidiaries. Except as set forth in Section 3(f) of the Disclosure
Schedule, the Seller has no Subsidiaries and no direct or indirect equity
participation in any corporation, partnership, trust, or other business
association.

                                       6
<PAGE>

         (g) Financial Statements. Attached hereto as Exhibit H are the
following financial statements (collectively the "Financial Statements"): (i)
unaudited balance sheets and statements of income, and cash flow as of and for
the fiscal year ended December 31, 2001 (the "Most Recent Fiscal Year End") for
the Seller; and (ii) unaudited balance sheets and statement of income (the "Most
Recent Financial Statements") as of and for the nine months ended September 30,
2002 (the "Most Recent Fiscal Month End") for the Seller. The Financial
Statements (including the notes thereto) present fairly in all material respects
the financial condition of the Seller as of such dates and the results of
operations of the Seller for such periods, are correct and complete, and are
consistent with the books and records of the Seller (which books and records are
correct and complete); provided, however, that the Most Recent Financial
Statements are subject to normal year-end adjustments (which will not be
material individually or in the aggregate) and lack footnotes and other
presentation items. The books of account, financial statements, and other
financial records of the Seller, all of which have been made available for
inspection by the Buyer, are complete and correct in all material respects and
have been maintained in accordance with sound business practices.

         (h) Events Subsequent to Most Recent Fiscal Month End. Except as set
forth in Section 3(h) of the Seller's Disclosure Schedule, since the Most Recent
Fiscal Month End, there has not been any change in the business, financial
condition, operations, results of operations, or future prospects of the Seller
that, individually or in the aggregate, would have a Material Adverse Effect.
Without limiting the generality of the foregoing, except as set forth in Section
3(h) of the Seller's Disclosure Schedule, since that date:

             (i) the Seller has not sold, leased, transferred, or assigned any
         of its assets, tangible or intangible, other than for a fair
         consideration in the Ordinary Course of Business;

             (ii) the Seller has not entered into any agreement, contract,
         lease, or license (or series of related agreements, contracts, leases,
         and licenses) either involving more than $10,000 or outside the
         Ordinary Course of Business;

             (iii) no party (including the Seller) has accelerated, terminated,
         modified, or canceled any agreement, contract, lease, or license (or
         series of related agreements, contracts, leases, and licenses)
         involving more than $10,000 to which the Seller is a party or by which
         it is bound;

             (iv) the Seller has not imposed any Security Interest upon any of
         its assets, tangible or intangible;

             (v) the Seller has not delayed or postponed the payment of accounts
         payable and other Liabilities outside the Ordinary Course of Business;

             (vi) the Seller has not canceled, compromised, waived, or released
         any right or claim (or series of related rights and claims) either
         involving more than $10,000 or outside the Ordinary Course of Business;

             (vii) the Seller has not granted any license or sublicense of any
         rights under or with respect to any Intellectual Property;

             (viii) the Seller has not experienced any damage, destruction, or
         loss (whether or not covered by insurance) to its property which,
         individually or in the aggregate, would have a Material Adverse Effect;

                                       7
<PAGE>

             (ix) there has not been any adverse change in the business
         relationship, and there has been no material dispute, between the
         Company and any Major Customers and Suppliers, and there are no
         indications that any of the Major Customers and Suppliers intends to
         reduce its purchases from or sales to the Company;

             (x) to the Knowledge of the Seller, there has not been any other
         material occurrence, event, incident, action, failure to act, or
         transaction outside the Ordinary Course of Business involving the
         Seller; and

             (xi) the Seller has not committed to any of the foregoing.

         (i) Undisclosed Liabilities. The Seller does not have any Liability
(and to the Knowledge of the Seller, there is no Basis for any present or future
action, suit, proceeding, hearing, investigation, charge, complaint, claim, or
demand against the Seller giving rise to any Liability), except for: (i)
Liabilities reflected on the face of the Most Recent Balance Sheet (rather than
in any notes thereto); (ii) Liabilities which have arisen after the Most Recent
Fiscal Month End in the Ordinary Course of Business (none of which results from,
arises out of, relates to, is in the nature of, or was caused by any breach of
contract, breach of warranty, tort, infringement, or violation of law); (iii)
Liabilities which would not, individually or in the aggregate, have a Material
Adverse Effect; and (iv) Liabilities disclosed on Section 3(i) of the Seller's
Disclosure Schedule.

         (j) Legal Compliance. The Seller has complied with all applicable laws
(including rules, regulations, codes, plans, injunctions, judgments, orders,
decrees, rulings, and charges thereunder) of federal, state, local, and foreign
governments (and all agencies thereof) except for such non-compliance as would
not have a Material Adverse Effect, and no action, suit, proceeding, hearing,
investigation, charge, complaint, claim, demand, or notice has been filed or
commenced against it alleging any failure so to comply.

         (k) Tax Matters.

             (i) The Seller has filed all material Tax Returns that it was
         required to file. All such Tax Returns were correct and complete in all
         material respects and all Taxes owed by the Seller (whether or not
         shown on such Tax Returns) have been paid. The Seller currently is not
         the beneficiary of any extension of time within which to file any Tax
         Return. No written claim has ever been made by an authority in a
         jurisdiction where the Seller does not file Tax Returns that it is or
         may be subject to taxation by that jurisdiction. There are no Security
         Interests on any of the assets of the Seller that arose in connection
         with any failure (or alleged failure) to pay any Tax.

             (ii) The Seller has withheld and paid all Taxes required to have
         been withheld and paid in connection with amounts paid or owing to any
         employee, independent contractor, creditor, stockholder, or other third
         party.

             (iii) There is no dispute or claim concerning any Tax Liability of
         the Seller either (A) claimed or raised by any authority in writing or
         (B) as to which any of the directors and officers (and employees
         responsible for Tax matters) of the Seller has Knowledge based upon
         personal contact with any agent of such authority. The Seller has not
         waived any statute of limitations in respect of Taxes or agreed to any
         extension of time with respect to a Tax assessment or deficiency.

                                       8
<PAGE>

         (l) Real Property.

             (i) The Seller does not own any real property.

             (ii) Section 3(1) of the Seller's Disclosure Schedule lists and
         briefly describes the real property leased or subleased to the Seller.

             (iii) No real property leased or subleased by the Seller lies in an
         area which is, or to the Knowledge of the Seller, will be, subject to
         zoning, use, or building code restrictions which would prohibit, and no
         state of facts relating to the actions or inaction of another person or
         entity or his or its ownership, leasing, subleasing, or use of any real
         or personal property exists or will exist which would prevent, the
         continued effective subleasing or use of such real property in the
         business in which Seller is now engaged.

         (m) Intellectual Property.

             (i) The Seller owns or has the right to use pursuant to license,
         sublicense, agreement, or permission all Intellectual Property
         necessary for the operation of the businesses of the Seller as
         presently conducted. Each item of Intellectual Property owned or used
         by the Seller immediately prior to the Closing hereunder will be owned
         or available for use by the Buyer on identical terms and conditions
         immediately subsequent to the Closing hereunder. The Seller has taken
         all necessary action to maintain and protect each item of Intellectual
         Property that it owns or uses.

             (ii) To the Knowledge of the Seller, the Seller has not interfered
         with, infringed upon, misappropriated, or otherwise come into conflict
         with any Intellectual Property rights of third parties, and neither the
         Seller nor any of the directors and officers (and employees with
         responsibility for Intellectual Property matters) of the Seller has
         ever received any charge, complaint, claim, demand, or notice alleging
         any such interference, infringement, misappropriation, or violation
         (including any claim that the Seller must license or refrain from using
         any Intellectual Property rights of any third party). To the Knowledge
         of the Seller and the directors and officers (and employees with
         responsibility for Intellectual Property matters) of the Seller, no
         third party has interfered with, infringed upon, misappropriated, or
         otherwise come into conflict with any Intellectual Property rights of
         the Seller.

             (iii) Section 3(m)(iii) of the Seller's Disclosure Schedule
         identifies each item of Intellectual Property that any third party owns
         and that the Seller uses pursuant to license, sublicense, agreement or
         permission. The Seller has delivered to the Buyer correct and complete
         copies of all such licenses, sublicenses, agreements, and permissions
         (as amended to date). With respect to each item of Intellectual
         Property required to be identified in Section 3(m)(iii) of the Seller's
         Disclosure Schedule:

                  (A) the license, sublicense, agreement or permission covering
                  the item is legal, valid, binding, enforceable and in full
                  force and effect;

                  (B) the license, sublicense, agreement or permission will
                  continue to be legal, valid, binding, enforceable and in full
                  force and effect on identical terms following the consummation
                  of the transactions contemplated hereby (including the
                  assignments and assumptions referred to in Section 2 above);

                                       9
<PAGE>

                  (C) to the Knowledge of the Seller, no party to the license,
                  sublicense, agreement or permission is in breach or default,
                  and no event has occurred which with notice or lapse of time
                  would constitute a breach or default or permit termination,
                  modification or acceleration thereunder;

                  (D) no party to the license, sublicense, agreement or
                  permission has repudiated any provision thereof;

                  (E) the underlying item of Intellectual Property is not
                  subject to any outstanding injunction, judgment, order,
                  decree, ruling, or charge;

                  (F) no action, suit, proceeding, hearing, investigation,
                  charge, complaint, claim, or demand is pending or, to the
                  Knowledge of the Seller, is threatened which challenges the
                  legality, validity, or enforceability of the underlying item
                  of Intellectual Property; and

                  (G) the Seller has not granted any sublicense or similar right
                  with respect to the license, sublicense, agreement, or
                  permission.

             (iv) The Seller will not interfere with, infringe upon,
         misappropriate or otherwise come into conflict with any Intellectual
         Property rights of third parties as a result of the continued operation
         of its businesses as presently conducted.

         (n) Tangible Assets. The Acquired Assets include all machinery,
equipment and other tangible assets reasonably necessary for the conduct of the
Seller's business as presently conducted. Each such tangible asset is free from
defects (patent and latent), has been maintained in accordance with normal
industry practice, is in operating condition (subject to normal wear and tear),
and is suitable for the purposes for which it presently is used.

         (o) Contracts. Section 3(o) of the Seller's Disclosure Schedule lists
the following contracts and other agreements to which the Seller is a party:

             (i) any agreement (or group of related agreements) for the lease of
         personal property to or from any Person providing for lease payments in
         excess of $10,000 per annum;

             (ii) any agreement (or group of related agreements) for the
         purchase or sale of raw materials, commodities, supplies, products, or
         other personal property, or for the furnishing or receipt of services,
         the performance of which will extend over a period of more than one
         year, result in a material loss to the Seller, or involve consideration
         in excess of $10,000;

             (iii) any agreement concerning a partnership or joint venture;

             (iv) any agreement (or group of related agreements) under which it
         has created, incurred, assumed, or guaranteed any indebtedness for
         borrowed money, or any capitalized lease obligation, in excess of
         $10,000 or under which it has imposed a Security Interest on any of its
         assets, tangible or intangible;

             (v) any agreement concerning confidentiality or noncompetition;

                                       10
<PAGE>

             (vi) any agreement involving any of the Seller's stockholders and
         their Affiliates (other than the Seller);

             (vii) any agreement under which it has advanced or loaned any
         amount to any of its directors, officers or employees outside the
         Ordinary Course of Business;

             (viii) any agreement for or relating to the sale or distribution of
         equipment, parts, supplies, expendables or tools, including, without
         limitation, such agreements directly or indirectly with manufacturers,
         co-ops and other retail or distribution businesses providing for
         payments in excess of $10,000 per annum;

             (ix) any agreement under which the consequences of a default or
         termination could have a Material Adverse Effect on the business,
         financial condition, operations, results of operations, or future
         prospects of the Seller; or

             (x) any other agreement (or group of related agreements) the
         performance of which involves consideration in excess of $10,000 per
         annum.

The Seller has delivered to the Buyer a correct and complete copy of each
written agreement (as amended to date) listed in Section 3(o) of the Seller's
Disclosure Schedule and a written summary setting forth the terms and conditions
of each oral agreement referred to in Section 3(o) of the Seller's Disclosure
Schedule. With respect to each such agreement: (A) the agreement is legal,
valid, binding, enforceable, and in full force and effect with regard to the
Seller, except as such enforceability may be (i) limited by bankruptcy,
insolvency, reorganization, liquidation, moratorium or other similar laws
affecting the rights and remedies of creditors generally and (ii) subject to
general principles of equity (regardless of whether such enforceability is
considered in a proceeding in equity or at law); (B) the agreement will continue
to be legal, valid, binding, enforceable, and in full force and effect with
regard to the Seller on identical terms following the consummation of the
transactions contemplated hereby (including the assignments and assumptions
referred to in Section 2 above); (C) the Seller is not in breach or default, and
no event has occurred which with notice or lapse of time would constitute a
breach or default, or permit termination, modification, or acceleration, under
the agreement; and (D) the Seller has not repudiated any provision of the
agreement.

         (p) Insurance. The Seller is covered by insurance in scope and amount
customary and reasonable for the businesses in which it is engaged. Section 3(p)
of the Seller's Disclosure Schedule describes any self-insurance arrangements
affecting the Seller.

         (q) Litigation. Section 3(q) of the Seller's Disclosure Schedule sets
forth each instance in which the Seller (i) is subject to any outstanding
injunction, judgment, order, decree, ruling, or charge or (ii) is a party or, to
the Knowledge of the Seller, is threatened to be made a party to any action,
suit, proceeding, hearing, or investigation of, in, or before any court or
quasi-judicial or administrative agency of any federal, state, local or foreign
jurisdiction or before any arbitrator. Except as set forth on Section 3(q) of
the Seller's Disclosure Schedule, none of the actions, suits, proceedings,
hearings, and investigations set forth on such Seller's Disclosure Schedule
could result in any Material Adverse Effect on the business, financial
condition, operations, results of operations, or future prospects of the Seller.

         (r) Environmental, Health, and Safety Matters.

             (i) The Seller is in compliance with all Environmental, Health, and
         Safety Requirements, except for such noncompliance which would not,
         individually or in the aggregate, have a Material Adverse Effect.

                                       11
<PAGE>

             (ii) Without limiting the generality of the foregoing, the Seller
         is in compliance with all permits, licenses and other authorizations
         that are required pursuant to Environmental, Health, and Safety
         Requirements for the occupation of its facilities and the operation of
         its business; a list of all such permits, licenses and other
         authorizations is set forth on the attached "Environmental and Safety
         Permits Schedule", except for such noncompliance which would not,
         individually or in the aggregate, have a Material Adverse Effect.

             (iii) The Seller has not received any written or oral notice,
         report or other information regarding any actual or alleged violation
         of Environmental, Health, and Safety Requirements, or any Liabilities
         or potential Liabilities, including any investigatory, remedial or
         corrective obligations, relating to it or its facilities arising under
         Environmental, Health, and Safety Requirements.

             (iv) To the Knowledge of the Seller, none of the following exists
         at any property or facility owned or operated by the Seller: (1)
         underground storage tanks; (2) asbestos-containing material in any form
         or condition; (3) materials or equipment containing polychlorinated
         biphenyls; or (4) landfills, surface impoundments, or disposal areas.

             (v) The Seller has not treated, stored, disposed of, arranged for
         or permitted the disposal of, transported, handled, or released any
         substance, including without limitation any hazardous substance, or
         owned or operated any property or facility (and no such property or
         facility is contaminated by any such substance) in a manner that has
         given or would give rise to Liabilities, including any Liability for
         response costs, corrective action costs, personal injury, property
         damage, natural resources damages or attorney fees, pursuant to the
         Comprehensive Environmental Response, Compensation and Liability Act of
         1980, as amended ("CERCLA"), the Solid Waste Disposal Act, as amended
         ("SWDA"), or any other Environmental, Health, and Safety Requirements,
         except for such Liabilities which would not, individually or in the
         aggregate, have a Material Adverse Effect.

             (vi) Neither this Agreement nor the consummation of the transaction
         that is the subject of this Agreement will result in any obligations
         for site investigation or cleanup, or notification to or consent of
         government agencies or third parties, pursuant to any of the so-called
         "transaction-triggered" or "responsible property transfer"
         Environmental, Health, and Safety Requirements.

             (vii) The Seller has not, either expressly or, to the Knowledge of
         the Seller, by operation of law, assumed or undertaken any Liability,
         including without limitation any obligation for corrective or remedial
         action, of any other Person relating to Environmental, Health, and
         Safety Requirements.

             (viii) To the Knowledge of the Seller, no facts, events or
         conditions relating to the past or present facilities, properties or
         operations of the Seller will prevent, hinder or limit continued
         compliance with Environmental, Health, and Safety Requirements, give
         rise to any investigatory, remedial or corrective obligations pursuant
         to Environmental, Health, and Safety Requirements, or give rise to any
         other Liabilities pursuant to Environmental, Health, and Safety
         Requirements, including without limitation any relating to onsite or
         offsite releases or threatened releases of hazardous materials,
         substances or wastes, personal injury, property damage or natural
         resources damage, except for such Liabilities which would not,
         individually or in the aggregate, have a Material Adverse Effect.

                                       12
<PAGE>

         (s) Customers, Suppliers, etc. Section 3(s) of the Seller's Disclosure
Schedule sets forth a true and complete list of all customers and accounts of
the Company which produced gross sales in excess of $10,000 during the 2002
fiscal year and all suppliers of the Company which furnished services or
supplies in excess of $10,000 to the Company in the 2002 fiscal year
(collectively, the "Major Customers and Suppliers"), in each case showing the
total revenue received or services purchased, as applicable, in each such period
from each such customer or supplier.

         (t) Certain Business Relationships With the Seller. Except as set forth
on Section 3(t) of the Seller's Disclosure Schedule, none of the Seller's
stockholders and their Affiliates has been involved in any business arrangement
or relationship with the Seller within the past 12 months, and none of the
Seller's stockholders and their Affiliates owns any asset, tangible or
intangible, which is used in the business of the Seller.

         (u) Disclosure. The representations and warranties contained in this
Section 3 do not contain any untrue statement of a material fact or omit to
state any material fact necessary in order to make the statements and
information contained in this Section 3 not misleading.

         (v) Questionable Payments. To the Knowledge of the Seller, neither the
Seller, nor any director, officer, agent, employee, or other person associated
with or acting on behalf of Seller, nor any of Seller's stockholders has,
directly or indirectly, used any corporate funds for unlawful contributions,
gifts, entertainment, or other unlawful expenses to obtain favorable treatment
in securing business or to obtain special concessions, or to pay for favorable
treatment for business secured or for special concessions already obtained.

         (w) Investment Representations and Covenants.

             (i) The Seller represents that it is acquiring the Centra Shares
         for its own account and for investment only and not with a view to
         distribution or resale thereof, other than a transfer of the Centra
         Shares to the Seller's parent or Affiliates. The Seller may not dispose
         of any part or all of the Centra Shares in violation of the provisions
         of the Securities Act of 1933, as amended (the "Securities Act"), and
         the rules and regulations promulgated under the Securities Act by the
         Securities and Exchange Commission ("SEC") and all applicable
         provisions of State securities laws and regulations.

             (ii) Legend. The certificate or certificates representing the
         Centra Shares shall bear a legend in substantially the following form:

"THE SHARES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT
OF 1933 AND HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO
DISTRIBUTION OR RESALE. SUCH SHARES MAY NOT BE SOLD, MORTGAGED, PLEDGED,
HYPOTHECATED OR OTHERWISE TRANSFERRED EXCEPT IN COMPLIANCE WITH THE TERMS OF A
STOCKHOLDERS AGREEMENT DATED JANUARY __, 2003. A COPY OF THE STOCKHOLDERS
AGREEMENT MAY BE EXAMINED AT THE COMPANY'S OFFICES.

THESE SECURITIES HAVE BEEN ISSUED OR SOLD IN RELIANCE ON PARAGRAPH 13 OF CODE
SECTION 10-5-9 OF THE GEORGIA SECURITIES ACT OF 1973, AND MAY NOT BE SOLD OR
TRANSFERRED EXCEPT IN A TRANSACTION WHICH IS EXEMPT UNDER SUCH ACT OR PURSUANT
TO AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT."

             (iii) Acknowledgment of Restrictions. The Seller acknowledges being
         informed that the Centra Shares are unregistered and must be held
         indefinitely unless they (i) are subsequently

                                       13
<PAGE>

         registered under the Securities Act, or (ii) an exemption from such
         registration is available, and (iii) the Buyer will not have an
         obligation to currently register the Centra Shares for the account of
         the Seller other than as contemplated in the Registration Rights
         Agreement.

             (iv) Access to Information. The Seller acknowledges that it has
         been afforded access to all material information which it has requested
         relevant to Seller's decision to acquire the Centra Shares and to ask
         questions of Buyer's management and that, except as set forth herein,
         neither the Buyer nor anyone acting on behalf of the Buyer has made any
         representations or warranties to the Seller which has induced,
         persuaded or stimulated Seller to acquire the Centra Shares.

             (v) Eligibility. Either alone, or together with its investment
         advisor(s), the Seller has the knowledge and experience in financial
         and business matters to be capable of evaluating the merits and risks
         of the prospective investment in the Centra Shares, and the Seller will
         be able to bear the economic risk of the investment in the Centra
         Shares.

         4. Representations and Warranties of the Buyer. The Buyer represents
and warrants to the Seller that the statements contained in this Section 4 are
correct and complete as of the date of this Agreement and will be correct and
complete as of the Closing Date (as though made then and as though the Closing
Date were submitted for the date of this Agreement throughout this Section 4),
except as set forth in the Buyer's Disclosure Statement.

         (a) Organization of the Buyer. The Buyer is a corporation duly
organized, validly existing and in good standing under the laws of the State of
Delaware.

         (b) Authorization of Transaction. The Buyer has full power and
authority (including full corporate power and authority) to execute and deliver
this Agreement and to perform its obligations hereunder. This Agreement
constitutes the valid and legally binding obligation of the Buyer, enforceable
in accordance with its terms and conditions, except as such enforceability may
be (i) limited by bankruptcy, insolvency, reorganization, liquidation,
moratorium or other similar laws affecting the rights and remedies of creditors
generally and (ii) subject to general principles of equity (regardless of
whether such enforceability is considered in a proceeding in equity or at law).
The Buyer's Board of Directors has approved the Buyer entering into this
Agreement and consummating the transactions contemplated herein. Approval of the
Buyer's shareholders to enter into this Agreement and consummate the
transactions contemplated herein (including the issuance of the Centra Shares)
is not required.

         (c) Noncontravention. Neither the execution and the delivery of this
Agreement, nor the consummation of the transactions contemplated hereby
(including the assignments and assumptions referred to in Section 2 above), will
(i) violate any constitution, statute, regulation, rule, injunction, judgment,
order, decree, ruling, charge, or other restriction of any government,
governmental agency, or court to which the Buyer is subject or any provision of
its charter or bylaws or (ii) conflict with, result in a breach of, constitute a
default under, result in the acceleration of, create in any party the right to
accelerate, terminate, modify, or cancel, or require any notice under any
agreement, contract, lease, license, instrument, or other arrangement to which
the Buyer is a party or by which it is bound or to which any of its assets is
subject. The Buyer does not need to give any notice to, make any filing with, or
obtain any authorization, consent, or approval of any government or governmental
agency in order for the Parties to consummate the transactions contemplated by
this Agreement (including the assignments and assumptions referred to in Section
2 above).

         (d) Centra Shares. The Centra Shares, when issued and delivered to the
Seller, will be duly authorized, fully paid, validly issued and non-assessable.
The issuance of the Centra Shares will not

                                       14
<PAGE>

violate the preemptive or other rights of any other person or entity and will
not violate any stockholders' agreement, voting trust or similar agreement.

         (e) Financial Information. The Buyer's financial statements for its
fiscal year ended December 31, 2001, and as of September 30, 2002 and for the
nine months then ended, all of which will be provided to the Seller during its
due diligence investigation of Buyer, have been prepared in accordance with GAAP
applied on a consistent basis throughout the periods covered thereby, and fairly
present the financial condition of Buyer and its results of operations as of the
dates and for the periods indicated, subject in the case of the September 30,
2002 financial statements only to normal year-end adjustments (none of which
will be material in amount). Since September 30, 2002, there has been no
Material Adverse Effect on the Buyer and no event has occurred which is
reasonably likely, individually or in the aggregate, to result in any Material
Adverse Effect on the Buyer. The Buyer has no material Liability of any kind,
except (a) Liabilities reflected in the September 30, 2002 financial statements
and (b) Liabilities in the Ordinary Course of Business since September 30, 2002.

         (f) Events Subsequent to Most Recent Fiscal Month End. Since the Most
Recent Fiscal Month End, there has not been any change in the business,
financial condition, operations, results of operations, or future prospects of
the Buyer that, individually or in the aggregate, would have a Material Adverse
Effect.

         (g) Undisclosed Liabilities. The Buyer does not have any Liability (and
to the Knowledge of the Buyer, there is no Basis for any present or future
action, suit, proceeding, hearing, investigation, charge, complaint, claim, or
demand against the Buyer giving rise to any Liability), except for: (i)
Liabilities reflected on the face of the Most Recent Balance Sheet (rather than
in any notes thereto); (ii) Liabilities which have arisen after the Most Recent
Fiscal Month End in the Ordinary Course of Business (none of which results from,
arises out of, relates to, is in the nature of, or was caused by any breach of
contract, breach of warranty, tort, infringement, or violation of law); and
(iii) Liabilities which would not, individually or in the aggregate, have a
Material Adverse Effect.

         (h) Legal Compliance. The Buyer has complied with all applicable laws
(including rules, regulations, codes, plans, injunctions, judgments, orders,
decrees, rulings, and charges thereunder) of federal, state, local, and foreign
governments (and all agencies thereof) except for such non-compliance as would
not have a Material Adverse Effect, and no action, suit, proceeding, hearing,
investigation, charge, complaint, claim, demand, or notice has been filed or
commenced against it alleging any failure so to comply.

         (i) Tax Matters.

             (i) The Buyer has filed all material Tax Returns that it was
         required to file. All such Tax Returns were correct and complete in all
         material respects and all Taxes owed by the Buyer (whether or not shown
         on such Tax Returns) have been paid. The Buyer currently is not the
         beneficiary of any extension of time within which to file any Tax
         Return. No written claim has ever been made by an authority in a
         jurisdiction where the Buyer does not file Tax Returns that it is or
         may be subject to taxation by that jurisdiction.

             (ii) The Buyer has withheld and paid all Taxes required to have
         been withheld and paid in connection with amounts paid or owing to any
         employee, independent contractor, creditor, stockholder, or other third
         party.

                                       15
<PAGE>

             (iii) There is no dispute or claim concerning any Tax Liability of
         the Buyer either (A) claimed or raised by any authority in writing or
         (B) as to which any of the directors and officers (and employees
         responsible for Tax matters) of the Buyer has Knowledge based upon
         personal contact with any agent of such authority. The Buyer has not
         waived any statute of limitations in respect of Taxes or agreed to any
         extension of time with respect to a Tax assessment or deficiency.

         (j) Real Property.

             (i) The Buyer's Disclosure Statement lists and briefly describes
         the real property owned, leased or subleased to the Buyer.

             (ii) No real property owned, leased or licensed by the Buyer lies
         in an area which is, or to the Knowledge of the Buyer, will be, subject
         to zoning, use, or building code restrictions which would prohibit, and
         no state of facts relating to the actions or inaction of another person
         or entity or his or its ownership, leasing, subleasing or use of any
         real or personal property exists or will exist which would prevent, the
         continued effective ownership, leasing, subleasing or use of such real
         property in the business in which Seller is now engaged.

         (k) Intellectual Property.

             (i) The Buyer owns or has the right to use pursuant to license,
         sublicense, agreement, or permission all Intellectual Property
         necessary for the operation of the businesses of the Buyer as presently
         conducted. The Buyer has taken all necessary action to maintain and
         protect each item of Intellectual Property that it owns or uses.

             (ii) To the Knowledge of the Buyer, the Buyer has not interfered
         with, infringed upon, misappropriated, or otherwise come into conflict
         with any Intellectual Property rights of third parties, and neither the
         Buyer nor any of the directors and officers (and employees with
         responsibility for Intellectual Property matters) of the Buyer has ever
         received any charge, complaint, claim, demand, or notice alleging any
         such interference, infringement, misappropriation, or violation
         (including any claim that the Buyer must license or refrain from using
         any Intellectual Property rights of any third party). To the Knowledge
         of the Buyer and the directors and officers (and employees with
         responsibility for Intellectual Property matters) of the Buyer, no
         third party has interfered with, infringed upon, misappropriated, or
         otherwise come into conflict with any Intellectual Property rights of
         the Buyer.

             (iii) The Buyer will not interfere with, infringe upon,
         misappropriate or otherwise come into conflict with any Intellectual
         Property rights of third parties as a result of the continued operation
         of its businesses as presently conducted.

         (l) Litigation. The Buyer's Disclosure Statement sets forth each
instance in which the Buyer (i) is subject to any outstanding injunction,
judgment, order, decree, ruling, or charge or (ii) is a party or, to the
Knowledge of the Buyer, is threatened to be made a party to any action, suit,
proceeding, hearing, or investigation of, in, or before any court or
quasi-judicial or administrative agency of any federal, state, local or foreign
jurisdiction or before any arbitrator. Except as set forth in the Buyer's
Disclosure Statement, none of the actions, suits, proceedings, hearings, and
investigations set forth on such Disclosure Statement could result in any
Material Adverse Effect on the business, financial condition, operations,
results of operations, or future prospects of the Buyer.

                                       16
<PAGE>

         (m) Environmental, Health, and Safety Matters.

             (i) The Buyer is in compliance with all Environmental, Health, and
         Safety Requirements, except for such noncompliance which would not,
         individually or in the aggregate, have a Material Adverse Effect.

             (ii) To the Knowledge of the Buyer, to the extent any of the
         following exists at any property or facility owned or operated by the
         Buyer: (1) underground storage tanks; (2) asbestos-containing material
         in any form or condition; (3) materials or equipment containing
         polychlorinated biphenyls; or (4) landfills, surface impoundments or
         disposal areas: the same is in compliance with applicable
         Environmental, Health and Safety Requirements.

             (iii) The Buyer has not treated, stored, disposed of, arranged for
         or permitted the disposal of, transported, handled, or released any
         substance, including without limitation any hazardous substance, or
         owned or operated any property or facility (and no such property or
         facility is contaminated by any such substance) in a manner that has
         given or would give rise to Liabilities, including any Liability for
         response costs, corrective action costs, personal injury, property
         damage, natural resources damages or attorney fees, pursuant to CERCLA,
         SWDA, or any other Environmental, Health, and Safety Requirements,
         except (A) for such Liabilities which would not, individually or in the
         aggregate, have a Material Adverse Effect and (B) with respect to RAKO,
         as disclosed in its filings with the SEC.

             (iv) The Buyer has not, either expressly or, to the Knowledge of
         the Buyer, by operation of law, assumed or undertaken any Liability,
         including without limitation any obligation for corrective or remedial
         action, of any other Person relating to Environmental, Health, and
         Safety Requirements.

         (n) Customers, Suppliers, etc. The Buyer's Disclosure Statement sets
forth information about Buyer's principal customers and suppliers.

         (o) Securities Law Compliance. The Buyer has complied in all respects
with the Securities Act and applicable state securities law in offering the
Centra Shares to the Seller and in selling such Centra Shares to the Seller upon
the consummation of the transactions contemplated hereby. The sale of the Centra
Shares to the Seller hereby is exempt from registration under the Securities Act
pursuant to Section 4(2) thereof and Regulation D promulgated thereunder and
from the Georgia Securities Act of 1973 pursuant to Section 10-5-9 (13) thereof.

         (p) Disclosure. The representations and warranties contained in this
Section 4 do not contain any untrue statement of a material fact or omit to
state any material fact necessary in order to make the statements and
information contained in this Section 4 not misleading.

         (q) Access to Information. The Buyer acknowledges that it has been
afforded access to all material information which it has requested relevant to
Buyer's decision to consummate the transactions completed hereby and to ask
questions of the Seller's management and that, except as set forth herein,
neither the Seller nor anyone acting on behalf of the Seller has made any
representations or warranties to the Buyer which has induced, persuaded or
stimulated the Buyer to acquire the Aquired Assets and assume the Assumed
Liabilities.

                                       17
<PAGE>

         (r) Insurance. The Buyer is covered by insurance in scope and amount
customary and reasonable for the businesses in which it is engaged. The Buyer's
Disclosure Statement describes any self-insurance arrangements affecting the
Buyer.

         (s) Brokers' Fees. The Buyer has no Liability or obligation to pay any
fees or commissions to any broker, finder, or agent with respect to the
transactions contemplated by this Agreement for which the Seller could become
liable or obligated.

         (t) Disclosure Statement. The Buyer has delivered to the Seller a copy
of the Buyer's Disclosure Statement dated January 24, 2003 which sets forth the
disclosure of certain information about the Buyer. Such disclosures do not
contain any untrue statement of a material fact or omit to state any material
fact necessary in order to make the statements and information contained in such
Disclosure Statement not misleading.

         (u) RAKO Acquisition of Buyer. The Buyer has advised the Seller that it
intends to become a public company through a business combination with RAKO, a
"shell" company, whereby the Buyer's outstanding shares will be exchanged for
shares of RAKO's common stock on a share for share basis. Thereafter, RAKO will
have 17,549,584 shares outstanding. Upon the consummation of the RAKO
transaction and the issuance of the Centra Shares to the Seller (assuming that
the Seller is entitled to all of such Centra Shares), the Seller will hold
approximately 20.11% of RAKO's then outstanding shares (exclusive of shares to
be issued to Stanford Venture Capital Holdings, Inc. simultaneously with the
Closing hereunder). RAKO's SEC filings are available through EDGAR, and RAKO's
CIK number is 0001063111.

         (v) RAKO Assumption. Upon consummation of the transaction with RAKO
described above, the Buyer will assign this Agreement to RAKO and RAKO will
assume Buyer's obligations. At the Closing, RAKO will issue its shares to the
Seller in place of the Centra Shares. In connection with such assumption, RAKO
will perform all of Centra's closing obligations, and RAKO will make all of the
representations and warranties that the Buyer is making hereunder, mutatis
mutandis.

         (w) Contracts. The Buyer's Disclosure Statement sets forth information
about material contracts and other agreements to which the Buyer is a party.

         5. Pre-Closing Covenants. The Parties agree as follows with respect to
the period between the execution of this Agreement and the Closing.

         (a) General. Each of the Parties will use commercially reasonable
efforts to take all action and to do all things necessary, proper, or advisable
in order to consummate and make effective the transactions contemplated by this
Agreement (including satisfaction, but not waiver, of the closing conditions set
forth in Section 6 below).

         (b) Notices and Consents. The Seller will give any notices to third
parties (including Major Suppliers and Major Customers), and the Seller will use
commercially reasonable efforts to obtain any third party consents that the
Buyer reasonably may request in connection with the matters referred to in
Section 3(o) above. Each of the Parties will give any notices to, make any
filings with, and use commercially reasonable efforts to obtain any
authorizations, consents, and approvals of governments and governmental agencies
in connection with the matters referred to in Section 3(c) and Section 4(c)
above. Without limiting the generality of the foregoing, each of the Parties
will file any Notification and Report Forms and related material that it may be
required to file with the Federal Trade Commission and the Antitrust Division of
the United States Department of Justice under the Hart-Scott-Rodino Act, will
use commercially reasonable efforts to obtain an early termination of the
applicable waiting period, and will

                                       18
<PAGE>

make any further filings pursuant thereto that may be necessary, proper or
advisable in connection therewith.

         (c) Operation of Business. Neither Party will engage in any practice,
take any action, or enter into any transaction outside the Ordinary Course of
Business, although the Seller acknowledges and agrees that the Buyer will engage
in the transaction with RAKO. Without limiting the generality of the foregoing,
the Seller will not (i) pay any amount to any third party with respect to any
Liability or obligation (including any costs and expenses the Seller has
incurred or may incur in connection with this Agreement and the transactions
contemplated hereby) which would not constitute an Assumed Liability if in
existence as of the Closing, or (ii) otherwise engage in any practice, take any
action, or enter into any transaction of the sort described in Section 3(h)
above or (iii) acquire, or agree to acquire, any business or business
organization or substantial portion of the assets of another Business.

         (d) Preservation of Business. Each Party will use commercially
reasonable efforts to keep its business and properties substantially intact,
including its present operations, physical facilities, working conditions, and
relationships with lessors, licensors, suppliers, customers, and employees.

         (e) Full Access. The Seller will permit representatives of the Buyer
and the Buyer's financing sources to have full access during normal business
hours to all premises, properties, personnel, customers, suppliers, wholesalers,
books, records, contracts and documents of or pertaining to the Seller. The
Buyer shall also have access to the Seller's employees, customers and suppliers
in connection with its due diligence review. The Buyer will likewise permit
representatives of the Seller to have access to all information that the Seller
reasonably requests in connection with its due diligence review of the Buyer.
Each Party will treat and hold information concerning the other Party that is
not already generally available to the public that the first Party discovered
during its due diligence review of the other Party as "Proprietary Information,"
as such term is defined in the Non-Disclosure Agreement dated November 6, 2002,
between the Parties.

         (f) Notice of Developments. Each Party will give prompt written notice
to the other Party of any material adverse development causing a breach of any
of its own representations and warranties in Sections 3 and 4 above. No
disclosure by any Party pursuant to this Section 5(f), however, shall be deemed
to amend or supplement the Disclosure Schedule of such Party or to prevent or
cure any misrepresentation, breach of warranty or breach of covenant.

         (g) Exclusivity. The Seller will not directly or indirectly, through
any director, officer, employee, agent, representative (including, without
limitation, investment bankers, attorneys and accountants) or otherwise (i)
solicit, initiate, or encourage the submission of any proposal or offer from any
Person relating to the acquisition of any capital stock or other voting
securities, or any substantial portion of the assets, of the Seller (including
any acquisition structured as a merger, consolidation, or share exchange) or
(ii) participate in any discussions or negotiations regarding, furnish any
information with respect to, assist or participate in, or facilitate in any
other manner any effort or attempt by any Person to do or seek any of the
foregoing. The Seller will notify the Buyer immediately if any Person makes any
proposal, offer, inquiry, or contact with respect to any of the foregoing.

                                       19
<PAGE>

         6. Conditions to Obligation to Close.

         (a) Conditions to Obligations of the Buyer. The obligation of the Buyer
to consummate the transactions to be performed by it in connection with the
Closing is subject to satisfaction of the following conditions:

             (i) the representations and warranties set forth in Section 3 above
         shall be true and correct in all material respects at and as of the
         Closing Date;

             (ii) the Seller shall have performed and complied with all of its
         covenants hereunder in all material respects through the Closing;

             (iii) the Seller shall have procured all of the third party
         consents specified in Section 5(b) above;

             (iv) no action, suit, or proceeding shall be pending or threatened
         before any court or quasi-judicial or administrative agency of any
         federal, state, local, or foreign jurisdiction or before any arbitrator
         wherein an unfavorable injunction, judgment, order, decree, ruling or
         charge would (A) prevent consummation of any of the transactions
         contemplated by this Agreement, (B) cause any of the transactions
         contemplated by this Agreement to be rescinded following consummation,
         (C) affect adversely the right of the Buyer to own the Acquired Assets
         or to operate the former businesses of the Seller;

             (v) the Seller shall have delivered to the Buyer a certificate to
         the effect that each of the conditions specified above in Section
         6(a)(i)-(iv) is satisfied in all respects; together with a bill of
         sale, assignment of Intellectual Property rights and such other
         instruments of transfer or conveyance as Buyer and its counsel
         reasonably may request;

             (vi) if applicable, the waiting period (and any extensions thereof)
         under the Hart-Scott-Rodino Act shall have expired or otherwise been
         terminated and the Seller and the Buyer shall have received all
         applicable authorizations, consents and approvals of governments and
         governmental agencies referred to in Section 3(c) and Section 4(c)
         above;

             (vii) the Buyer shall have received approval and/or transfer of
         Major Customers and Suppliers agreements on terms no less favorable
         than exist on the date of this Agreement and consent of any third party
         required pursuant to Section 3(o);

             (viii) the Buyer shall have concluded its due diligence review of
         the Seller, the Acquired Assets and the Assumed Liabilities and found
         the results of its investigation acceptable;

             (ix) the Seller (and upon distribution of the Centra Shares to its
         shareholders, such shareholders) will enter into the Stockholders
         Agreement;

             (x) the Seller (and upon distribution of the Centra Shares to its
         shareholders, such shareholders) will enter into the Registration
         Rights Agreement;

             (xi) the first closing of a Securities Purchase Agreement between
         Centra and Stanford Venture Capital Holdings, Inc. shall occur
         simultaneously with the Closing hereof;

                                       20
<PAGE>

                  (xii) the Buyer and Seller shall have entered into a mutually
         acceptable sublease or license agreement for Buyer's use of the
         premises at Alpharetta, Georgia during an agreed transition period (the
         "Alpharetta Agreement"); and

                  (xiii) all actions to be taken by the Seller in connection
         with the consummation of the transactions contemplated hereby and all
         certificates, opinions, instruments, and other documents required to
         effect the transactions contemplated hereby will be reasonably
         satisfactory in form and substance to the Buyer.

The Buyer may waive any condition specified in this Section 6(a) if it executes
a writing so stating at or prior to the Closing.

         (b) Conditions to Obligation of the Seller. The obligation of the
Seller to consummate the transactions to be performed by it in connection with
the Closing is subject to satisfaction of the following conditions:

             (i) the representations and warranties set forth in Section 4 above
         shall be true and correct in all material respects at and as of the
         Closing Date;

             (ii) the Buyer shall have performed and complied with all of its
         covenants hereunder in all material respects through the Closing;

             (iii) no action, suit, or proceeding shall be pending or threatened
         before any court or quasi-judicial or administrative agency of any
         federal, state, local, or foreign jurisdiction or before any arbitrator
         wherein an unfavorable injunction, judgment, order, decree, ruling, or
         charge would (A) prevent consummation of any of the transactions
         contemplated by this Agreement or (B) cause any of the transactions
         contemplated by this Agreement to be rescinded following consummation
         (and no such injunction, judgment, order, decree, ruling, or charge
         shall be in effect);

             (iv) the Buyer shall have delivered to the Seller a certificate to
         the effect that each of the conditions specified above in Section
         6(b)(i)-(iii) is satisfied in all respects; together with an assumption
         of the Assumed Liabilities;

             (v) if applicable, the waiting period (and any extensions thereof)
         under the Hart-Scott-Rodino Act shall have expired or otherwise been
         terminated and the Seller and the Buyer shall have received all
         authorizations, consents and approvals of governments and governmental
         agencies referred to in Section 3(c) and Section 4(c) above;

             (vi) the Seller shall have concluded its due diligence review of
         the Buyer and found the results of the Seller's investigation
         acceptable;

             (vii) the Centra Shares shall be delivered to the Seller;

             (viii) the Buyer will enter into the License Agreement;

             (ix) all actions to be taken by the Buyer in connection with
         consummation of the transactions contemplated hereby and all
         certificates, opinions, instruments, and other documents required to
         effect the transactions contemplated hereby will be reasonably
         satisfactory in form and substance to the Seller;

                                       21
<PAGE>

             (x) the Buyer shall have consummated its transaction with RAKO and
         shall have become a public company on the terms previously disclosed to
         the Seller;

             (xi) the Buyer shall have delivered to Seller an opinion of counsel
         that the Centra Shares, upon being issued to Seller pursuant to the
         terms of this Agreement, will be duly authorized, fully paid, validly
         issued and non-assessable; and

             (xii) Buyer and Seller shall have entered into the Alpharetta
         Agreement.

The Seller may waive any condition specified in this Section 6(b) if it executes
a writing so stating at or prior to the Closing.

         7. Termination.

         (a) Termination of Agreement. Certain of the Parties may terminate this
Agreement as provided below:

             (i) the Buyer and the Seller may terminate this Agreement by mutual
         written consent at any time prior to the Closing;

             (ii) the Buyer may terminate this Agreement by giving written
         notice to the Seller at any time prior to the Closing in the event the
         Seller has breached any material representation, warranty, or covenant
         contained in this Agreement in any material respect, the Buyer has
         notified the Seller of the breach in writing and with specificity as to
         the nature of the breach, and the breach has continued without cure for
         a period of thirty (30) days after the notice of breach;

             (iii) the Seller may terminate this Agreement by giving written
         notice to the Buyer at any time prior to the Closing in the event the
         Buyer has breached any material representation, warranty, or covenant
         contained in this Agreement in any material respect, the Seller has
         notified the Buyer of the breach in writing and with specificity as to
         the nature of the breach, and the breach has continued without cure for
         a period of thirty (30) days after the notice of breach; and

             (iv) by either Buyer or Seller, if the transactions contemplated
         hereby are not consummated on or before January 31, 2003.

         (b) Effect of Termination. If any Party terminates this Agreement
pursuant to Section 7(a) above, all rights and obligations of the Parties
hereunder shall terminate without any Liability of any Party to any other Party
(except any Liability of any Party then in breach).

         8. Post-Closing Covenants. The Parties agree as follows with respect to
the period following the Closing:

         (a) General. In case at any time after the Closing any further action
is necessary or desirable to carry out the purposes of this Agreement, each of
the Parties will take such further action (including the execution and delivery
of such further instruments and documents) as any other Party reasonably may
request. The Seller acknowledges and agrees that from and after the Closing the
Buyer will be entitled to possession of all of the Acquired Assets.

         (b) Litigation Support. In the event and for so long as either Party is
actively contesting or defending against any action, suit, proceeding, hearing,
investigation, charge, complaint, claim, or

                                       22
<PAGE>

demand in connection with (i) any transaction contemplated under this Agreement
or (ii) any fact, situation, circumstance, status, condition, activity,
practice, plan, occurrence, event, incident, action, failure to act, or
transaction on or prior to the Closing Date involving the Seller, the other
Party will cooperate with the contesting or defending Party and his or its
counsel in the contest or defense, make available his or its personnel, and
provide such testimony and access to his or its books and records as shall be
necessary in connection with the contest or defense, all at the sole cost and
expense of the contesting or defending Party (unless the contesting or defending
Party is entitled to indemnification therefor under Section 9 below).

         (c) Transition. During the three month period immediately following
Closing, authorized representatives of Seller (not employed by Buyer) shall
provide consultation and take any other action reasonably requested by the Buyer
to assist the Buyer in (i) assuming and operating the Seller's business to the
Buyer, (ii) the transfer to Buyer of the Acquired Assets and the goodwill and
reputation of the Seller, and (iii) continuing the Seller's relationships with
customers and suppliers; provided, however, that in no event shall the
consultation or other actions required of such persons by this sentence exceed
an aggregate of five (5) hours per week. The Buyer will pay $250.00 for each
hour of consulting services, plus expenses, and such person(s) will be
indemnified by the Buyer for any actions taken by on behalf of Buyer so long as
such persons acted in good faith. The Seller will not take any action that is
designed or intended to have the effect of discouraging any lessor, licensor,
customer, supplier, or other business associate of the Seller from maintaining
the same business relationships with the Buyer after the Closing as it
maintained with the Seller prior to the Closing. The Seller will refer all
customer inquiries relating to the businesses of the Seller to the Buyer from
and after the Closing.

                                       23
<PAGE>

          (d) Confidentiality. The Seller will treat and hold as such all of the
Confidential Information (as hereinafter defined), refrain from using any of the
Confidential Information except in connection with this Agreement, and deliver
promptly to the Buyer or destroy, at the request and option of the Buyer, all
tangible embodiments (and all copies) of the Confidential Information which are
in its possession. In the event that the Seller is requested or required (by
oral question or request for information or documents in any legal proceeding,
interrogatory, subpoena, civil investigative demand, or similar process) to
disclose any Confidential Information, then the Seller will notify the Buyer
promptly of the request or requirement so that the Buyer may seek an appropriate
protective order or waive compliance with the provisions of this Section 8(d).
If, in the absence of a protective order or the receipt of a waiver hereunder,
the Seller is, on the advice of counsel, compelled to disclose any Confidential
Information to any tribunal or else stand liable for contempt, then the Seller
may disclose the Confidential Information to the tribunal; provided, however,
that the Seller shall use its reasonable best efforts to obtain, at the
reasonable request and expense of the Buyer, an order or other assurance that
confidential treatment will be accorded to such portion of the Confidential
Information required to be disclosed as the Buyer shall designate. To the extent
that the Seller or its Affiliates has provided any Confidential Information to
the Buyer regarding the Seller's assets and Liabilities not being assigned to
the Buyer or regarding the Seller's Affiliates, then the Buyer agrees to treat
all such information as Confidential Information of the Seller and to comply
with this Section 8(d) as if the Buyer was the Seller named herein. For purposes
hereof, "Confidential Information" shall mean information relating to the
financial condition, results of operations, business, properties, assets,
liabilities, and future prospects of Buyer or Seller, as the case may be, or any
customer or supplier of either of them or any Affiliate, which information
affords a perceived competitive advantage and is held in confidence; provided,
however, that Confidential Information shall not include information which (a)
shall have become publicly available without violation of this Agreement, (b)
which is known to a party prior to its disclosure, (c) which is available from a
third party free of any restriction for the benefit of Buyer or Seller (as the
case may be) or (d) which is independently developed by a party without
reference to the Confidential Information of the other party.

          (e) Covenant Not to Compete. For a period of two (2) years from and
after the Closing Date, the Seller agrees that it will not engage, directly or
indirectly, in the territory described on Exhibit I hereto, in the businesses
also described on such Exhibit. If the final judgment of a court of competent
jurisdiction declares that any term or provision of this Section 8(e) is invalid
or unenforceable, then the Parties agree that the court making the determination
of invalidity or unforceability shall have the power to reduce the scope,
duration, or area of the term or provision with a term or provision that is
valid and enforceable and that comes closest to expressing the intention of the
invalid or unenforceable term or provision, and this Agreement shall be
enforceable as so modified after the expiration of the time within which the
judgment may be appealed.

          (f) Non-solicitation. For a period of two years from and after the
Closing Date, the Seller will not, directly or indirectly, (A) recruit, solicit
or otherwise induce or influence any employee, sales agent, joint venturer,
lessor, supplier, agent, buyer or any other person that has or had during the
one year period initially preceding the Closing Date a business relationship
with the Seller, to discontinue, reduce or adversely modify such employment,
agency or business relationship with the Buyer or the business as conducted by
the Seller prior to the Closing Date, or (B) employ or seek to employ or cause
any Person to employ or seek to employ any person or agent who is employed or
retained by the Buyer.

          (g) Taxes. The Buyer shall bear all sales, use, conveyance, stamp
duty, transfer, sales, registration, recording or other similar fees and taxes
imposed as a result of the transactions contemplated herein. The obligations of
the Buyer set forth in this Section 8(g) shall be unconditional and absolute and
shall remain in effect until the expiration of the applicable statutes of
limitation (including waivers and extensions thereof) for the taxable year or
period at issue.

                                       24
<PAGE>

          (h) Bulk Transfer Laws. The Buyer hereby waives compliance by the
Seller with the provisions of any "bulk transfer", "bulk sales" or equivalent
laws of any jurisdiction in connection with the sale of the Acquired Assets to
Buyer. However, the Seller agrees to indemnify the Buyer and its Affiliates, in
accordance with the terms of Section 9, for any Adverse Consequences occurring
due to the Seller's failure to comply with any such laws.

          (i) Insurance. After the Closing Date and for a period of (2) two
years, the Seller shall maintain any policies of insurance which cover
liabilities associated with the operation of the Seller's business prior to the
Closing Date, to the extent necessary to maintain coverage during such 2-year
period. The Buyer will have no obligations or liabilities under such insurance
policies for additional premiums or similar payments after the Closing Date,
either due to retroactive adjustments, audits, roll-backs or otherwise. The
Seller will cooperate after the Closing Date with the Buyer and its insurance
carriers and agents in connection with the foregoing and with the Buyer in
establishing new insurance policies and coverage for the Buyer from and after
the Closing Date.

          (j) Record Retention and Access. The Parties shall maintain possession
of all books and records related to the Acquired Assets at least as long as
required by applicable law or regulation; provided, that thereafter the Parties
shall give the other not less than sixty (60) days prior written notice of its
intention to dispose of any such books and records. During such notice period,
one Party may direct the other Party to ship such books and records to it or to
a location designated by it and the other Party shall comply with such direction
at the requesting Party's expense. So long as any books and records related to
the Acquired Assets remain in its possession, the Parties shall, upon reasonable
notice, make such books and records available to the other Party and their
designees, representatives and agents for inspection and copying (at the
requesting Party's expense) insofar as is necessary for the preparation of tax
returns and similar matters. Without limiting the foregoing, the Parties shall
have the right for a period of five (5) years following the Closing Date to have
reasonable access to such books, correspondence, production records and other
records (and for a period of six (6) years following the Closing Date with
respect to the tax records of the Acquired Assets) that are transferred to the
Buyer or retained by the Seller pursuant to the terms of this Agreement and for
complying with their respective obligations pursuant to this Agreement and under
applicable securities, tax, environmental, employment or other laws and
regulations.

          (k) Offer of Employment. As of the Closing Date, the Buyer may offer
employment to those persons it chooses who were active employees of the Seller
on the day immediately preceding the Closing Date. Such employees who accept
such offer of employment and become employees of the Buyer shall be referred to
herein as the "Transferred Employees". The offer of employment shall be upon
such terms and conditions as the Buyer determines. Notwithstanding the
foregoing, the Buyer retains the right to amend the terms and conditions of
employment and to terminate the employment of any of the Transferred Employees
as it may determine in its sole discretion.

         (l) Audit. The Buyer shall, at the Buyer's expense, audit the Seller's
financial statements for fiscal year 2001 and a review of the 2002 interim
period to the Closing Date free of any material adjustments, revisions or
restatements to conform the financial statements to GAAP. The Seller agrees to
cooperate with the Buyer and take any further action requested by the Buyer to
facilitate the audit.

         9. Remedies for Breaches of this Agreement.

         (a) Survival of Representations and Warranties. All of the
representations and warranties of the Buyer and the Seller shall survive the
Closing (even if the damaged Party knew or had reason to know or any
misrepresentation or breach of warranty at the time of Closing) and continue in
full force and effect until the date that is eighteen (18) months after the
Closing Date; provided that (x) the

                                       25
<PAGE>

representations contained in Section 3(a) through (c) and Section 4(a) through
(d) shall continue in full force and effect forever thereafter and (y) the
representations contained in Sections 3(k), and 3(r) shall continue in full
force and effect until 30 days following the expiration of the applicable
statutes of limitations (including any extension or waiver thereof).

         (b) Indemnification Provisions for Benefit of the Buyer.

             (i) In the event the Seller breaches (or in the event any third
         party alleges facts that, if true, would mean the Seller has breached)
         any of its representations, warranties and covenants in this Agreement,
         then the Seller agrees to indemnify the Buyer from and against the
         entirety of any Adverse Consequences the Buyer may suffer (including
         any Adverse Consequences the Buyer may suffer after the end of any
         applicable survival period as long as the indemnification claim is
         brought before the end of such survival period) resulting from, arising
         out of, relating to, in the nature of, or caused by the breach (or the
         alleged breach); provided, however, that the Seller shall not have any
         obligation to indemnify the Buyer from and against any Adverse
         Consequences resulting from, arising out of, relating to, in the nature
         of, or caused by the breach (or alleged breach) of any representation
         or warranty of the Seller until the Buyer has suffered Adverse
         Consequences by reason of all such breaches (or alleged breaches) in
         excess of a $50,000 aggregate threshold (at which point the Seller will
         be obligated to indemnify the Buyer from and against all such Adverse
         Consequences by reason of all such breaches (or alleged breaches) in
         excess of such $50,000 aggregate threshold.

             (ii) The Seller agrees to indemnify the Buyer from and against the
         entirety of any Adverse Consequences the Buyer may suffer resulting
         from, arising out of, relating to, in the nature of, or caused by any
         Liability of any of the Seller which is not an Assumed Liability
         (including any Liability of the Seller that becomes a Liability of the
         Buyer under any bulk transfer law of any jurisdiction, under any common
         law doctrine of de facto merger or successor Liability, under
         Environmental, Health, and Safety Requirements, or otherwise by
         operation of law).

          (c) Indemnification Provisions for Benefit of the Seller.

             (i) In the event the Buyer breaches (or in the event any third
         party alleges facts that, if true, would mean the Buyer has breached)
         any of its representations, warranties and covenants in this Agreement,
         then the Buyer agrees to indemnify the Seller from and against the
         entirety of any Adverse Consequences the Seller may suffer (including
         any Adverse Consequences the Seller may suffer after the end of any
         applicable survival period as long as the indemnification claim is
         brought before the end as such survival period) resulting from, arising
         out of, relating to, in the nature of, or caused by the breach (or
         alleged breach); provided, however, that the Buyer shall not have any
         obligation to indemnify the Seller from and against any Adverse
         Consequences resulting from, arising out of, relating to, in the nature
         of, or caused by the breach (or alleged breach) of any representation
         or warranty of the Buyer until the Seller has suffered Adverse
         Consequences by reason of all such breaches (or alleged breaches) in
         excess of a $50,000 aggregate threshold (at which point the Buyer will
         be obligated to indemnify the Seller from and against all such Adverse
         Consequences by reason of all such breaches (or alleged breaches) in
         excess of such $50,000 aggregate threshold..

             (ii) The Buyer agrees to indemnify the Seller from and against the
         entirety of any Adverse Consequences the Seller may suffer resulting
         from, arising out of, relating to, in the nature of, or caused by the
         Buyer's failure to pay the Seller the entire Purchase Price, any

                                       26
<PAGE>

         Assumed Liability or from a claim made by a Transferred Employee
         relating to actions taken or not taken by the Buyer following the
         Closing.

         (d) Matters Involving Third Parties.

             (i) If any third party shall notify any Party (the "Indemnified
         Party") with respect to any matter (a "Third Party Claim") which may
         give rise to a claim for indemnification against any other Party (the
         "Indemnifying Party") under this Section 9, then the Indemnified Party
         shall promptly notify each Indemnifying Party thereof in writing;
         provided, however, that no delay on the part of the Indemnified Party
         in notifying the Indemnifying Party shall relieve the Indemnifying
         Party from any obligation hereunder unless (and then solely to the
         extent) the Indemnifying Party thereby is prejudiced.

             (ii) Any Indemnifying Party will have the right to defend the
         Indemnified Party against the Third Party Claim with counsel of its
         choice satisfactory to the Indemnified Party so long as (A) the
         Indemnifying Party notifies the Indemnified Party in writing within 15
         days after the Indemnified Party has given notice of the Third Party
         Claim that the Indemnifying Party will indemnify the Indemnified Party
         from and against the entirety of any Adverse Consequences the
         Indemnified Party may suffer resulting from, arising out of, relating
         to, in the nature of, or caused by the Third Party Claim, (B) the
         Indemnifying Party provides the Indemnified Party with evidence
         reasonably acceptable to the Indemnified Party that the Indemnifying
         Party will have the financial resources to defend against the Third
         Party Claim and fulfill its indemnification obligations hereunder, (C)
         the Third Party Claim involves only money damages and does not seek an
         injunction or other equitable relief, (D) settlement of, or an adverse
         judgment with respect to, the Third Party Claim is not, in the good
         faith judgment of the Indemnified Party, likely to establish a
         precedential custom or practice materially adverse to the continuing
         business interests of the Indemnified Party, and (E) the Indemnifying
         Party conducts the defense of the Third Party Claim actively and
         diligently.

             (iii) So long as the Indemnifying Party is conducting the defense
         of the Third Party Claim in accordance with Section 9(d)(ii) above, (A)
         the Indemnified Party may retain separate co-counsel at its sole cost
         and expense and participate in the defense of the Third Party Claim,
         (B) the Indemnified Party will not consent to the entry of any judgment
         or enter into any settlement with respect to the Third Party Claim
         without the prior written consent of the Indemnifying Party, and (C)
         the Indemnifying Party will not consent to the entry of any judgment or
         enter into any settlement with respect to the Third Party Claim without
         the prior written consent of the Indemnified Party.

             (iv) In the event any of the conditions in Section 9(d)(ii) above
         is or becomes unsatisfied, however, (A) the Indemnified Party may
         defend against, and consent to the entry of any judgment or enter into
         any settlement with respect to, the Third Party Claim in any manner it
         reasonably may deem appropriate (and the Indemnified Party need not
         consult with, or obtain any consent from, any Indemnifying Party in
         connection therewith), (B) the Indemnifying Party will reimburse the
         Indemnified Party promptly and periodically for the costs of defending
         against the Third Party Claim (including reasonable attorneys' fees and
         expenses), and (C) the Indemnifying Party will remain responsible for
         any Adverse Consequences the Indemnified Party may suffer resulting
         from, arising out of, relating to, in the nature of, or caused by the
         Third Party Claim to the fullest extent provided in this Section.

          (e) Determination of Adverse Consequences. The Parties shall take into
account the cost of money (using the Applicable Rate as the discount rate) in
determining Adverse Consequences for

                                       27
<PAGE>

purposes of this Section 9. All indemnification payments under this Section 9
shall be deemed adjustments to the Purchase Price.

         (f) Adjustment to Indemnities. The amount of indemnity payable under
Section 9(b) or Section 9(c) shall be treated by the Buyer and the Seller as an
adjustment to the Purchase Price, and shall be calculated after giving effect to
(i) any proceeds received from insurance policies covering the damage, loss,
liability or expense that is the subject of the claim for indemnity, net of any
increase in premium as a result of such claim and (ii) the actual realized Tax
benefit to the Indemnified Party resulting from the damage, loss, liability or
expense that is the subject of the indemnity and of the indemnity payment
itself; provided that, to the extent that any Tax benefit is realized in a Tax
year other than the year in which the indemnity is paid, the Indemnified Party
shall make a payment to the Indemnifying Party in the amount of such realized
Tax benefit in the year in which it is realized. For purposes of this Section
9(f), an actual realized Tax benefit is an actual reduction in Taxes payable or
a refund of Taxes previously paid.

         (g) Other Indemnification Provisions. The foregoing indemnification
provisions are in addition to, and not in derogation of, any statutory,
equitable, or common law remedy (including without limitation any such remedy
arising under Environmental, Health and Safety Requirements) any Party may have
with respect to Buyer or Seller, their Affiliates, or the transactions
contemplated by this Agreement.

         10. Miscellaneous.

         (a) Press Releases and Public Announcements. No Party shall issue any
press release or make any public announcement relating to the subject matter of
this Agreement without the prior written approval of the other Party; provided,
however, that any Party may make any public disclosure it believes in good faith
is required by applicable law or any listing or trading agreement concerning its
publicly-traded securities (in which case the disclosing Party will use its
reasonable best efforts to advise the other Party prior to making the
disclosure).

         (b) No Third Party Beneficiaries. This Agreement shall not confer any
rights or remedies upon any Person other than the Parties and their respective
successors and permitted assigns.

         (c) Entire Agreement. This Agreement (including documents referred to
herein) constitutes the entire agreement between the Parties and supersedes any
prior understandings, agreements, or representations by or between the Parties,
written or oral, to the extent they related in any way to the subject matter
hereof.

         (d) Succession and Assignment. This Agreement shall be binding upon and
inure to the benefit of the Parties named herein and their respective successors
and permitted assigns. No Party may assign either this Agreement or any of its
rights, interests, or obligations hereunder without the prior written approval
of the other Party, which approval will not be unreasonably withheld; provided,
however, that the Buyer may (i) assign any or all of its rights and interest
hereunder to RAKO in connection with the business combination disclosed in
Section 4(u) and (ii) designate RAKO to perform its obligations hereunder (in
any or all of which cases the Buyer nonetheless shall remain responsible for the
performance of all of its obligations hereunder).

         (e) Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original but all of which
together will constitute one and the same instrument.

         (f) Headings. The section headings contained in this Agreement are
inserted for convenience only and shall not affect in any way the meaning or
interpretation of this Agreement.

                                       28
<PAGE>

         (g) Notices. All notices, requests, demands, claims, and other
communications hereunder will be in writing. Any notice, request, demand, claim,
or other communication hereunder shall be deemed duly given if (and then three
business days after) it is sent by registered or certified mail, return receipt
requested, postage prepaid, and addressed to the intended recipient as set forth
below:

         If to the Seller:          TWS International, Inc.
                                    6120 Windward Parkway
                                    Suite 200
                                    Atlanta, Georgia  30005
                                    Attention:  Luis Delahoz
                                    Telephone:  770-752-7033
                                    Facsimile:  770-752-7136

                                    With a copy to:

                                    McKenna Long & Aldridge LLP
                                    303 Peachtree Street, Suite 5300
                                    Atlanta, Georgia 30308
                                    Attention:  George C. Gaskin, Esq.
                                    Telephone: 404-527-8363
                                    Facsimile:  404-527-4198

         If to the Buyer:           Centra Industries, Inc.
                                    Two North College Avenue
                                    Fayetteville, Arkansas  72701
                                    Attention:  Lisa Trammell
                                    Telephone: 479-684-2700
                                    Facsimile: 479-684-2799

                                    With a copy to:

                                    Reitler Brown LLC
                                    800 Third Avenue
                                    21st Floor
                                    New York, New York 10022
                                    Attention:  Ray A. Mantle, Esq.
                                    Telephone: (212) 209-3050
                                    Facsimile:  (212) 371-5500.

Any Party may send any notice, request, demand, claim, or other communication
hereunder to the intended recipient at the address set forth above using any
other means (including personal delivery, expedited courier, messenger service,
telecopy, telex, ordinary mail, or electronic mail), but no such notice,
request, demand, claim, or other communication shall be deemed to have been duly
given unless and until it actually is received by the intended recipient. Any
Party may change the address to which notices, requests, demands, claims, and
other communications hereunder are to be delivered by giving the other Party
notice in the manner herein set forth.

         (h) Governing Law. This agreement shall be governed by and construed in
accordance with the laws of the State of Delaware without giving effect to any
choice or conflict of law provision or rule.

                                       29
<PAGE>

         (i) Amendments and Waivers. No amendment of any provision of this
Agreement shall be valid unless the same shall be in writing and signed by the
Buyer and the Seller. No waiver by any Party of any default, misrepresentation
or breach of warranty or covenant hereunder, whether intentional or not, shall
be deemed to extend to any prior or subsequent default, misrepresentation or
breach of warranty or covenant hereunder or affect in any way any rights arising
by virtue of any prior or subsequent such occurrence.

         (j) Severability. Any term or provision of this Agreement that is
invalid or unenforceable in any situation in any jurisdiction shall not affect
the validity or enforceability of the remaining terms and provisions hereof or
the validity or enforceability of the offending term or provision in any other
situation or in any other jurisdiction.

         (k) Expenses. Each of the Buyer and the Seller will bear its own costs
and expenses (including legal fees and expenses) incurred in connections with
this Agreement and the transactions contemplated hereby.

         (l) Construction. The Parties have participated jointly in the
negotiation and drafting of this Agreement. In the event an ambiguity or
question of intent or interpretation arises, this Agreement shall be construed
as if drafted jointly by the Parties and no presumption or burden of proof shall
arise favoring or disfavoring any Party by virtue of the authorship of any of
the provisions of this Agreement. Any reference to any federal, state, local, or
foreign statute or law shall be deemed also to refer to all rules and
regulations promulgated thereunder, unless the context requires otherwise. The
word "including" shall mean including without limitation. Nothing in the
Disclosure Schedule shall be deemed adequate to disclose an exception to a
representation or warranty made herein unless the Disclosure Schedule identifies
the exception with reasonable particularity and describes the relevant facts in
reasonable detail. Without limiting the generality of the foregoing, the mere
listing (or inclusion of a copy) of a document or other item shall not be deemed
adequate to disclose an exception to a representation or warranty made herein
(unless the representation or warranty has to do with the existence of the
document or other item itself). The Parties intend that each representation,
warranty, and covenant contained herein shall have independent significance. If
any Party has breached any representation, warranty or covenant contained herein
in any respect, the fact that there exists another representation, warranty or
covenant relating to the same subject matter (regardless of the relative levels
of specificity) which the Party has not breached shall not detract from or
mitigate the fact that the Party is in breach of the first representation,
warranty, or covenant.

         (m) Incorporation of Exhibits and Schedules. The Exhibits and Schedules
identified in this Agreement are incorporated herein by reference and made a
part hereof.

         (n) Specific Performance. Each of the Parties acknowledges and agrees
that the other Party would be damaged irreparably in the event any of the
provisions of this Agreement are not performed in accordance with their specific
terms or otherwise are breached. Accordingly, each of the Parties agrees that
the other Party shall be entitled to an injunction or injunctions to prevent
breaches of the provisions of this Agreement and to enforce specifically this
Agreement and the terms and provisions hereof in any action instituted in any
court of the United States or any state thereof having jurisdiction over the
Parties and the matter, in addition to any other remedy to which it may be
entitled, at law or in equity.

         (o) Submissions to Jurisdiction. Any action or proceeding arising out
of or relating to this Agreement or the transactions contemplated hereby may be
brought only in the U.S. District Court for Delaware or the Delaware state
courts. Each of the Parties waives any defense of inconvenient forum to the
maintenance of any action or proceeding so brought and waives any bond, surety
or other security that might be required of any other Party with respect
thereto. Any Party may make service on the other Party

                                       30
<PAGE>

by sending or delivering a copy of the process to the Party to be served at the
address and in the manner provided for the giving of notices in Section 10(g)
above. Nothing in this Section 10(o), however, shall affect the right of any
Party to bring any action or proceeding arising out of or relating to this
Agreement in any other court or to serve legal process in any other manner
permitted by law or in equity. Each Party agrees that a final judgment in any
action or proceeding so brought shall be conclusive and may be enforced by suit
on the judgement or in any other manner provided by law or in equity.

                            [SIGNATURES ON NEXT PAGE]

                                       31
<PAGE>

IN WITNESS WHEREOF, the Parties hereto have duly executed this Agreement as of
the date first above written.

                               TWS INTERNATIONAL, INC.

                               By: /s/ Luis Delahoz
                                  ------------------------------
                                  LUIS DELAHOZ
                                  CEO

                               CENTRA INDUSTRIES, INC.

                               By: /s/ Gary Fuchs
                                  ------------------------------
                                  GARY FUCHS
                                  CEO

                                       32

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