NATIONAL EQUIPMENT SERVICES INC
8-K, 1998-09-29
EQUIPMENT RENTAL & LEASING, NEC
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<PAGE>
 
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, DC 20549


                                    FORM 8-K

                                 CURRENT REPORT


     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934



     Date of Report (date of earliest event reported): September 17, 1998


                       NATIONAL EQUIPMENT SERVICES, INC.
             (Exact name of registrant as specified in its charter)


          Delaware                      1-14163                  36-4087016
- ----------------------------        ----------------         -------------------
(State or other jurisdiction        (Commission File            (IRS Employer
     of incorporation)                  Number)              Identification No.)
                       

1800 Sherman Avenue, Evanston, Illinois                             60201
- ---------------------------------------                      -------------------
(Address of principal executive offices)                         (Zip Code)



Registrant's telephone number, including area code:    (847) 733-1000
                                                    ---------------------


                       This Instrument contains 5 pages.

                    The Exhibit Index is located on page 5.
<PAGE>
 
Item 2. Acquisition or Disposition of Assets

          On September 17, 1998, National Equipment Services, Inc., a Delaware
     corporation (the "Company"), completed its acquisition of the business of
     Shaughnessy Crane Service, Inc., a Massachusetts corporation ("SCS"),
     pursuant to the terms of the Stock Purchase Agreement, dated as of
     September 17, 1998 (the "Stock Purchase Agreement"), by and among the
     Company, SCS and the stockholders of SCS. The following discussion is only
     a summary and is qualified in its entirety by reference to the Exhibits to
     this Current Report on Form 8-K.

          Pursuant to the Stock Purchase Agreement, the Company acquired all of
     the issued and outstanding capital stock of SCS.  The stockholders of SCS
     received a cash payment of $65,000,000 (subject to a customary indebtedness
     adjustment, working capital adjustment and accounts receivable adjustment)
     and a junior subordinated convertible promissory note in the principal
     amount of $15,000,000 (the "Note").  The Note accrues interest at the rate
     of 8% per annum and the Company may prepay all or any portion of the
     outstanding principal amount of the Note at any time, except as may be
     prohibited by any senior debt.  In addition, at any time prior to September
     17, 1999, the holders of the Note may elect to convert the principal amount
     of the Note, plus accrued and unpaid interest, into the number of shares of
     Company common stock equal to such amount divided by $13.00.  In the event
     the Note has not been prepaid in full or converted into shares of Company
     common stock as described in the preceding sentence, then on September 17,
     1999, the outstanding principal amount of the Note, plus accrued and unpaid
     interest, will automatically convert into a number of shares of Company
     common stock having a fair market value equal to the principal amount of
     the Note plus accrued and unpaid interest.

          The nature and amount of consideration was determined as a result of
     negotiations among the Company, SCS and the stockholders of SCS.  Prior to
     the acquisition, there was no relationship among (i) SCS or the
     stockholders of SCS and (ii) the registrant or any of its affiliates, any
     director or officer of the registrant, or any associate of any such
     director or officer.  The source of the cash portion of the consideration
     was borrowings under the registrant's existing credit facility.  SCS has in
     the past specialized, and the Company expects to cause SCS to continue to
     specialize, in the rental of aerial lift equipment and cranes to industrial
     and construction end-users.  SCS competes primarily in Massachusetts, New
     Hampshire and Rhode Island.
<PAGE>
 
Item 7. Financial Statements and Exhibits

     (a) Financial Statements of Businesses Acquired

          To be filed by amendment. Pursuant to Item 7(a)(4) of Form 8-K, the
     registrant hereby indicates that the filing of the financial statements
     required in response to this item within 15 calendar days of the
     acquisition is impracticable and undertakes to file such information on an
     amendment to this Form 8-K no later than 60 days after October 2, 1998.

     (b) Pro Forma Financial Information.

          To be filed by amendment. Pursuant to Item 7(b)(2) of Form 8-K, the
     registrant hereby indicates that the filing of the financial statements
     required in response to this item within 15 calendar days of the
     acquisition is impracticable and undertakes to file such information on an
     amendment to this Form 8-K no later than 60 days after October 2, 1998.

     (c) Exhibits

     2.1   Stock Purchase Agreement, dated as of September 17, 1998, by and 
           among National Equipment Services, Inc., Shaughnessy Crane Service,
           Inc. and the stockholders of Shaughnessy Crane Service, Inc.

     4.1   Junior Subordinated Convertible Promissory Note, dated September 17,
           1998, in the principal amount of $15,000,000.

     4.2   Supplemental Indenture, dated September 24, 1998, by and between
           Shaughnessy Crane Service, Inc. and Harris Savings and Trust Company,
           as trustee.

     99.1  Press Release dated September 23, 1998.
<PAGE>
 
                                   SIGNATURE

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


Dated: September 29, 1998
                                    NATIONAL EQUIPMENT SERVICES, INC.

                                         /s/ Paul R. Ingersoll
                                    By:  __________________________
                                    Name:  Paul R. Ingersoll
                                    Title: Vice President and Secretary
<PAGE>
 
                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
Exhibit No.                           Description
- -----------  ------------------------------------------------------------------
<C>          <S>
2.1          Stock Purchase Agreement, dated as of September 17, 1998, by and 
             among National Equipment Services, Inc., Shaughnessy Crane Service,
             Inc. and the stockholders of Shaughnessy Crane Service, Inc.

4.1          Junior Subordinated Convertible Promissory Note, dated
             September 17, 1998, in the principal amount of $15,000,000.

4.2          Supplemental Indenture, dated September 24, 1998, by and
             between Shaughnessy Crane Service, Inc. and Harris Savings
             and Trust Company, as trustee.

99.1         Press Release dated September 23, 1998.
</TABLE>

<PAGE>
 
                                                                     Exhibit 2.1
                                                                     -----------


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



                           STOCK PURCHASE AGREEMENT



                                 BY AND AMONG



                       SHAUGHNESSY CRANE SERVICE, INC.,



              THE STOCKHOLDERS OF SHAUGHNESSY CRANE SERVICE, INC.



                                      AND



                       NATIONAL EQUIPMENT SERVICES, INC.



                        DATED AS OF SEPTEMBER 17, 1998



                       EFFECTIVE AS OF SEPTEMBER 1, 1998


================================================================================
<PAGE>

                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                   Page
<S>                                                                <C>

ARTICLE I

     DEFINITIONS..................................................... 1
     1.1   Definitions............................................... 1
     1.2   Other Definitional Provisions............................. 5
     1.3   Cross Reference of Other Definitions...................... 6

ARTICLE II

     PURCHASE AND SALE OF STOCK...................................... 7
     2.1   Stock Purchase............................................ 7
     2.2   Purchase Price for Company Stock.......................... 7
     2.3   Purchase Price Adjustments................................ 7
     2.4   Closing Transactions...................................... 9

ARTICLE III

     ADDITIONAL CLOSING DELIVERIES...................................10
     3.1   Sellers' Deliveries.......................................10
     3.2   Purchaser's Deliveries....................................12

ARTICLE IV

     REPRESENTATIONS AND WARRANTIES CONCERNING THE COMPANY...........12
     4.1   Organization and Corporate Power..........................12
     4.2   Authorization of Transactions.............................13
     4.3   Capitalization............................................13
     4.4   Subsidiaries; Investments.................................13
     4.5   Absence of Conflicts......................................13
     4.6   Financial Statements and Related Matters..................14
     4.7   Absence of Undisclosed Liabilities........................14
     4.8   Absence of Certain Developments...........................14
     4.9   Title to Properties.......................................16
     4.10  Taxes.....................................................17
     4.11  Contracts and Commitments.................................19
     4.12  Proprietary Rights........................................20
     4.13  Litigation; Proceedings...................................21
     4.14  Brokerage.................................................21
     4.15  Governmental Licenses and Permits.........................21
     4.16  Employees.................................................21
     4.17  Employee Benefit Plans....................................21
     4.18  Insurance.................................................23
     4.19  Officers and Directors; Bank Accounts.....................23
     4.20  Affiliate Transactions....................................23
     4.21  Compliance with Laws......................................23
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
<S>                                                                 <C>
     4.22  Environmental Matters....................................23
     4.23  Disclosure...............................................24
     4.24  Closing Date.............................................25

ARTICLE V

     REPRESENTATIONS AND WARRANTIES CONCERNING THE SELLERS..........25
     5.1   Authorization of Transactions............................25
     5.2   Absence of Conflicts.....................................25
     5.3   Brokerage................................................26
     5.4   Shares...................................................26
     5.5   Investment in NES Stock..................................26
     5.6   Closing Date.............................................26

ARTICLE VI

     REPRESENTATIONS AND WARRANTIES CONCERNING THE PURCHASER........26
     6.1   Organization and Corporate Power.........................26
     6.2   Authorization............................................27
     6.3   No Violation.............................................27
     6.4   Governmental Authorities and Consents....................27
     6.5   Litigation...............................................27
     6.6   Brokerage................................................27
     6.7   Investment...............................................27
     6.8   Closing Date.............................................27
     6.9   SEC Filings..............................................28

ARTICLE VII

     INDEMNIFICATION AND RELATED MATTERS............................28
     7.1   Survival.................................................28
     7.2   Indemnification..........................................28
     7.3   Exclusive Remedy.........................................32
     7.4   Rights to Setoff.........................................32

ARTICLE VIII

     ADDITIONAL AGREEMENTS..........................................32
     8.1   Continuing Assistance....................................32
     8.2   Tax Matters..............................................32
     8.3   Press Releases and Announcements.........................34
     8.4   Further Transfers........................................35
     8.5   Specific Performance.....................................35
     8.6   Transition Assistance....................................35
     8.7   Expenses.................................................35
     8.8   Exclusivity..............................................35
     8.9   Books and Records........................................36
     8.10  Appointment of Representative............................36
</TABLE>
                                      -ii-
<PAGE>

<TABLE>
<CAPTION>
<S>                                                                <C>
     8.11  Noncompetition, Nonsolicitation and Confidentiality.....38
     8.12  NES Stock...............................................39
     8.13  Employee Benefits.......................................40

ARTICLE IX

     MISCELLANEOUS
     9.1   Amendment and Waiver....................................40
     9.2   Notices.................................................40
     9.3   Binding Agreement; Assignment...........................41
     9.4   Severability............................................42
     9.5   No Strict Construction..................................42
     9.6   Captions................................................42
     9.7   Entire Agreement........................................42
     9.8   Counterparts............................................42
     9.9   Governing Law...........................................42
     9.10  Parties in Interest.....................................42
     9.11  Performance.............................................42
</TABLE>
                                     -iii-
<PAGE>
 
                               INDEX OF EXHIBITS
                               -----------------

Exhibit A   -   Form of Convertible Promissory Note
 
Exhibit B   -   Form of Employment Agreement
 
Exhibit C   -   Form of Leases
 
Exhibit D   -   Form of Opinion of Counsel to the Company and the Sellers
 
Exhibit E   -   Form of Supply Agreement
 
Exhibit F   -   Form of Escrow Agreement
 
Exhibit G   -   Form of Opinion of Counsel to the Purchaser
 
                              INDEX OF SCHEDULES
                              ------------------

Schedule of Stockholders
Excluded Asset Schedule
Schedule of Transferred Employees
Organization Schedule
Conflicts Schedule
Financial Statements Schedule
Developments Schedule
Real Property Schedule
Taxes Schedule
Assets Schedule
Tax Allocation Schedule
Contracts Schedule
Proprietary Rights Schedule
Litigation Schedule
Brokerage Schedule
Permits Schedule
Employees Schedule
Benefit Plans Schedule
Insurance Schedule
Officers, Directors and Bank Accounts Schedule
Affiliated Transactions Schedule
Environmental Schedule
Special Matter Schedule

[The exhibits and schedules identified on this page have not been filed with the
Commission. The Company agrees to furnish supplementally a copy of these 
exhibits and schedules to the Commission upon request.]

                                     -iv-
<PAGE>
 
                            STOCK PURCHASE AGREEMENT

          THIS STOCK PURCHASE AGREEMENT is made as of September 17, 1998, by and
among SHAUGHNESSY CRANE SERVICE, INC., a Massachusetts corporation (the
"Company"), the stockholders of the Company listed on the "Schedule of
Stockholders" attached hereto (collectively, the "Sellers" and individually, a
"Seller"), and NATIONAL EQUIPMENT SERVICES, INC., a Delaware corporation (the
"Purchaser").  The Company, the Sellers and the Purchaser are referred to herein
collectively as the "Parties" and individually as a "Party."

          WHEREAS, the authorized capital stock of the Company consists of
300,000 shares of Common Stock, without par value (the "Common Stock"), of which
52,000 shares are issued and outstanding;

          WHEREAS, the Sellers own beneficially and of record 100% of the 
issued and outstanding Common Stock; and

          WHEREAS, the Purchaser desires to acquire from each Seller, and each
Seller desires to sell to the Purchaser, all of the Common Stock owned by such
Seller (collectively, the "Acquired Stock").

          NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the Parties agree as follows:


                                   ARTICLE I

                                  DEFINITIONS

          1.1  Definitions.  For purposes hereof, the following terms, when used
herein with initial capital letters, shall have the respective meanings set
forth herein:

          "Additional Rental Equipment Amount" means the aggregate amount paid
by the company prior to the Closing Date for the rental fleet equipment received
by the Company on or after June 1, 1998.

          "Affiliate" of any Person means any other Person controlling,
controlled by or under common control with such first Person, where "control"
means the possession, directly or indirectly, of the power to direct the
management and policies of a Person whether through the ownership of voting
securities or otherwise; provided that in any event, Shaughnessy and Ahern
Company, a Massachusetts corporation ("S&A"), and Boston Crane & Rigging, Inc.,
a Massachusetts corporation ("BCR"), will be deemed to be Affiliates of the
Company.

          "Affiliated Group" means an affiliated group as defined in Section
1504 of the Code (or any similar combined, consolidated or unitary group defined
under state, local or foreign income Tax law).
<PAGE>
 
          "Agreement" means this Stock Purchase Agreement, including all
Exhibits and Schedules hereto, as it may be amended from time to time in
accordance with its terms.

          "CERCLA" means the Comprehensive Environmental Response, 
Compensation and Liability Act of 1980, as amended.

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

          "Environmental Affiliates" of any Person means, with respect to any
particular matter, all other Persons whose liabilities or obligations with
respect to that particular matter have been assumed by, or are otherwise deemed
by law to be those of, such first Person.

          "Environmental and Safety Requirements" means all federal, state,
local and foreign statutes, regulations, ordinances and similar 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 all
such standards of conduct and bases of obligations relating to the presence,
use, production, generation, handling, transport, 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 by-products, asbestos, polychlorinated
biphenyls (or PCBs), noise or radiation.

          "Environmental Lien" means any Lien, whether recorded or unrecorded,
in favor of any governmental entity or any department, agency or political
subdivision thereof relating to any liability of the Company or any Seller or
any Environmental Affiliate of the Company or any Seller arising under any
Environmental and Safety Requirement.

          "Equipment Rental Services" means (i) renting, leasing, purchasing or
selling hydraulic, conventional or any other crane; (ii) renting, leasing,
purchasing or selling boom, scissor, forklift, loader or any other aerial lift;
(iii) renting, leasing, purchasing or selling any other commercial rental
equipment of a type consistent with the Company's historical rental activities
and (iv) serving or acting as a dealer or distributor or participating in the
dealership or distributorship of any of the equipment described in this
paragraph; provided that "Equipment Rental Services" shall not apply to
purchasing, renting or leasing any equipment from or to the Company, or the
renting or leasing of any equipment (provided that such equipment was purchased,
rented or leased from the Company pursuant to the Company's standard purchase or
rental contract or purchased, rented or leased in accordance with the provisions
of one of the Supply Agreements) to or from any third party; provided further,
that "Equipment Rental Services" shall not apply to the sale of equipment that
was purchased in accordance with the provisions of one of the Supply Agreements
for the purpose of using such equipment in the operation of the purchasing
party's normal business (as opposed to any re-rental or re-sale business) after
such purchasing party has finished using such equipment.

          "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended.

          "Excluded Assets" means those assets described on the Excluded Assets
Schedule attached hereto.

                                      -2-
<PAGE>
 
          "GAAP" means, at a given time, United States generally accepted
accounting principles, applied on a basis consistent with the Financial
Statements to the extent the Financial Statements themselves are prepared in
accordance with United States generally accepted accounting principles.

          "Indebtedness" of any Person means, without duplication: (a)
indebtedness for borrowed money or for the deferred purchase price of property
or services in respect of which such Person is liable, contingently or
otherwise, as obligor or otherwise (other than trade payables and other current
liabilities incurred in the ordinary course of business) and any commitment by
which such Person assures a creditor against loss, including contingent
reimbursement obligations with respect to letters of credit; (b)  indebtedness
guaranteed in any manner by such Person, including a guarantee in the form of an
agreement to repurchase or reimburse; (c) obligations under capitalized leases
in respect of which such Person is liable, contingently or otherwise, as
obligor, guarantor or otherwise, or in respect of which obligations such Person
assures a creditor against loss; and (d) any unsatisfied obligation of such
Person for "withdrawal liability" to a "multiemployer plan," as such terms are
defined under ERISA.

          "Insider" means, any officer, director, stockholder, or Affiliate, as
applicable, of the Company or any of its Affiliates or any immediate family
member of such Person (including, without limitation, any Person related by
marriage or adoption to any such individual) or any entity in which any such
Person owns a 5% or greater beneficial interest.

          "Inventory" means (i) the Company's spare parts inventory, (ii) items
held by the Company for resale and (iii) the Company's inventory of fuels,
lubricants and other consumables.

          "Inventory Amount" means the aggregate fair market value, as of a 
given time, of the Inventory.

          "Knowledge" (i) with respect to an individual means actual knowledge
without any implied duty of investigation; (ii) with respect to the Company
means the actual knowledge of any Seller or any director of the Company without
any implied duty to investigate; and (iii) with respect to a trust means actual
knowledge of the trustee(s) without any implied duty to investigate.

          "Licenses" means all permits, licenses, franchises, certificates,
approvals and other authorizations of foreign, federal, state and local
governments or other similar rights.

          "Lien" means any mortgage, pledge, security interest, encumbrance, 
restriction, charge, or other lien.

          "Loss" means, with respect to any Person, any diminution in value, or
other damage, liability, demand, claim, action, cause of action, cost, damage,
deficiency, Tax, penalty, fine or other loss or expense, whether or not arising
out of a third party claim, including all interest, penalties, reasonable
attorneys' fees and expenses and all amounts paid or incurred in connection with
any action, demand, proceeding, investigation or claim by any third party
(including any governmental entity or any department, agency or political
subdivision thereof) against or affecting such Person or which, if determined
adversely to such Person, would give rise to, evidence the existence of, or
relate to, any other Loss and the investigation, defense or settlement of any of
the foregoing, together with interest thereon from the date on which such Person
provides the written notice of the related

                                      -3-
<PAGE>
 
claim as described in Section 7.2 (Indemnification) through and including the
date on which the total amount of the claim, including such interest, is
recovered or recouped pursuant to Article VII.

          "Material Adverse Effect" means any material adverse effect on the
business, financial condition, operations, or results of operations of the
Company or any of its Subsidiaries.

          "Millwright Business" means the installation and/or removal of 
machinery systems for profit by the Company.

          "Net Working Capital Amount" means, as of a given time, (i) the book
value of the Company's current assets (other than Inventory and Excluded
Assets), determined in accordance with GAAP, applied on a basis consistent with
preparation of the Company's June 30, 1998 balance sheet, minus (ii) the book
value of the Company's current liabilities, determined in accordance with GAAP,
applied on a basis consistent with the preparation of the Company's June 30,
1998 balance sheet.

          "Ordinary Course of Business" means the ordinary course of the
Company's and its Subsidiaries' businesses consistent with past practice
(including, without limitation, with respect to collection of accounts
receivable, purchases of inventory and supplies, repairs and maintenance,
payment of accounts payable and accrued expenses, levels of capital expenditures
and operation of cash management practices generally).

          "Permitted Encumbrances" means (A) statutory liens for current taxes
or other governmental charges with respect to the Real Property not yet due and
payable or the amount or validity of which is being contested; (B) mechanics,
carriers, workers, repairers and similar statutory liens arising or incurred in
the Ordinary Course of Business for amounts which are not delinquent and which
could not, individually or in the aggregate, have a Material Adverse Effect; (C)
zoning, entitlement, building and other land use regulations imposed by
governmental agencies having jurisdiction over the Real Property which are not
violated by the current use and operation of the Real Property; and (D)
covenants, conditions, restrictions, easements and other matters of record
affecting title to the Real Property which do not unreasonably interfere with
the current use, occupancy, or value, or the marketability of title, of the Real
Property.

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

          "Proprietary Rights" means any and all patents, patent applications,
trademarks, service marks, trademark or service mark applications and
registrations, trade and corporate names, copyrights, copyright applications,
registrations and customer and supplier lists.

          "Release" shall have the meaning set forth in CERCLA.

          "Rigging Business" means (i) rigging, trucking, heavy hauling,
barging, route surveying, escorting, transporting, delivering, warehousing,
storage handling, packaging, crating and shipping; (ii) rental, sales, leasing
and operation of rigging and transporting equipment; and (iii) consulting,
permitting, engineering, bidding, estimating, designing and contracting with
respect to

                                      -4-
<PAGE>
 
the forgoing items (i) and (ii) or with respect to any items of rental equipment
to be provided by the Company pursuant to one of the Supply Agreements.

          "Subsidiary" means, with respect to any Person, any corporation a
majority of the total voting power of shares of stock of which is entitled
(without regard to the occurrence of any contingency) to vote in the election of
directors, managers or trustees thereof is at the time owned or controlled,
directly or indirectly, by that Person or one or more of the other Subsidiaries
of that Person or a combination thereof, or any partnership, association or
other business entity a majority of the partnership or other similar ownership
interest of which is at the time owned or controlled, directly or indirectly, by
that Person or one or more Subsidiaries of that Person or a combination thereof.
For purposes of this definition, a Person is deemed to have a majority ownership
interest in a partnership, association or other business entity if such Person
is allocated a majority of the gains or losses of such partnership, association
or other business entity or is or controls a managing director or general
partner of such partnership, association or other business entity.

          "Tax Returns" means returns, declarations, reports, claims for refund,
information returns or other documents (including any related or supporting
schedules, statements or information) filed or required to be filed in
connection with the determination, assessment or collection of Taxes of any
party or the administration of any laws, regulations or administrative
requirements relating to any Taxes.

          "Taxes" means any federal, state, local, or foreign income, gross
receipts, license, payroll, employment, estimated, excise, severance, stamp,
occupation, premium, windfall profits, environmental, customs duties, capital
stock, franchise, profits, withholding, social security, unemployment,
disability, real property, personal property, sales, use, transfer,
registration, value added, alternative or add-on minimum, or other tax, fee,
assessment or charge of any kind whatsoever, including any interest, penalty, or
addition thereto, whether disputed or not.

          "Transaction Documents" means this Agreement, and all other
agreements, instruments, certificates and other documents to be entered into or
delivered by any Party in connection with the transactions contemplated to be
consummated pursuant to this Agreement.

          "Treasury Regulations" means the United States Treasury Regulations 
promulgated pursuant to the Code.

          1.2  Other Definitional Provisions.

          (a)  Accounting Terms.  Accounting terms which are not otherwise
defined in this Agreement have the meanings given to them under GAAP.  To the
extent that the definition of accounting term that is defined in this Agreement
is inconsistent with the meaning of such term under GAAP, the definition set
forth in this Agreement will control.

          (b)  "Hereof," etc.  The terms "hereof," "herein" and "hereunder" and
terms of similar import are references to this Agreement as a whole and not to
any particular provision of this Agreement.  Section, clause, Schedule and
Exhibit references contained in this Agreement are references to Sections,
clauses, Schedules and Exhibits in or to this Agreement, unless otherwise
specified.

                                      -5-
<PAGE>
 
          (c)  Successor Laws.  Any reference to any particular Code section or
any other law or regulation will be interpreted to include any revision of or
successor to that section regardless of how it is numbered or classified.

          1.3  Cross Reference of Other Definitions.  Each capitalized term
listed below is defined in the corresponding Section of this Agreement:

Term                                             Section
- ----                                             -------
338(h)(10) Elections                             8.2(a)
Acquired Stock                                   Recitals
Actual Additional Rental Equipment Amount        2.3(b)
Actual Inventory Amount                          2.3(b)
Actual Net Working Capital Amount                2.3(b)
Additional Collection                            2.3(c)
Applicable Limitation Date                       7.1
Authorized Action                                8.10(d)
Cap                                              7.2(b)(iii)
Cash Portion                                     2.2
Closing                                          2.4(a)
Closing Accounts Receivable                      2.3(c)
Closing Date                                     2.4(a)
Closing Review                                   2.3(b)
COBRA                                            4.17(a)
Common Stock                                     Recitals
Company                                          Preface
Confidential Information                         8.11(c)
Draft Computation                                2.3(b)
Employment Agreements                            3.1(d)
ERISA                                            4.17(a)
Financial Statements                             4.6(a)
Firm                                             2.3(b)
Indemnified Party                                7.2(e)
Indemnifying Party                               7.2(e)
HSR Filing                                       4.5
Latest Balance Sheet                             4.6(a)
Leased Properties                                4.9(b)
Leases                                           3.1(e)
NES Stock                                        5.5(a)
Noncompete Period                                8.11(a)
Noncompeting Parties                             8.11(a)
Note                                             2.2
Objection Notice                                 2.3(b)
Party                                            Preface
Purchase Price                                   2.2
Purchaser                                        Preface
Purchaser Parties                                7.2(a)
Real Property                                    4.9(b)
Receivables Determination Date                   2.3(c)

                                      -6-
<PAGE>
 
Representative                                   8.10(a)
S Elections                                      4.10(i)
SEC Reports                                      6.9
Seller                                           Preface
Seller Parties                                   7.2(c)
Supply Agreement                                 3.1(f)
Transaction Expenses                             8.7
Uncollected Receivables Amount                   2.3(c)


                                  ARTICLE II

                          PURCHASE AND SALE OF STOCK
                          --------------------------

          2.1  Stock Purchase.  On and subject to the terms and conditions set 
forth in this Agreement, on the Closing Date, the Purchaser shall purchase from
each Seller, and each Seller shall sell and transfer to the Purchaser, all of
the shares of Common Stock owned by such Seller as such ownership is set forth
on the Schedule of Stockholders attached hereto, free and clear of any Liens.

          2.2  Purchase Price for Company Stock.  The aggregate purchase price 
to be paid to Sellers for the Acquired Stock (the "Purchase Price") is
$80,000,000, which amount shall be paid as follows: (a) the Purchaser shall
deliver to the Sellers $57,000,000 (as adjusted pursuant to Section 2.3 below)
in cash (as adjusted, the "Cash Portion"), (b) the Purchaser shall deposit
$8,000,000 in an escrow account governed by the escrow agreement referred to in
Section 3.1(h), and (c) the Purchaser shall deliver to the Sellers a junior
subordinated convertible promissory note in the aggregate principal amount of
$15,000,000 in the form of Exhibit A attached hereto (the "Note"); the Note
shall be available to satisfy any amounts owing to the Purchaser pursuant to
Section 2.3 and/or Section 7.2.  The Purchase Price will be allocated among the
Sellers in the manner set forth in Schedule of Stockholders attached hereto.
The Cash Portion is subject to adjustment pursuant to Section 2.3.

          2.3  Purchase Price Adjustments.

          (a)  Closing Date Adjustment for Indebtedness.  At the Closing, the
Purchase Price will be decreased dollar-for-dollar by an amount equal to the
amount necessary to discharge fully the then outstanding balance of the
Company's Indebtedness (including, without limitation, prepayment penalties and
premiums), if any, which amount shall be paid by the Purchaser directly to the
holders of such Indebtedness pursuant to Section 2.4(b)(ii) below.

          (b)  Post-Closing Adjustment for Net Working Capital, Inventory and
Rental Equipment.

          (i)  Within 90 days after the Closing Date, the Purchaser and its
     auditors will conduct a review (the "Closing Review") of the Net Working
     Capital Amount and the Inventory Amount as of the close of business on the
     day before the Closing Date and of the Additional Rental Equipment Amount
     and will prepare and deliver to the Representative a computation of the Net
     Working Capital Amount and the Inventory Amount as of the close of business
     on the day before the Closing Date and of the Additional Rental Equipment

                                      -7-
<PAGE>
 
     Amount (the "Draft Computation"). The Purchaser and its auditors will give
     the Representative and its auditors the opportunity to observe the Closing
     Review and will make available to the Representative and its auditors all
     records and work papers used in preparing the Draft Computation.  The
     Purchaser and its auditors shall provide full cooperation to the
     Representative and its auditors, including, without limitation, making
     available and providing reasonable access to the premises, books and
     records, and employees of the Company.  If the Representative disagrees
     with the computation of the Net Working Capital Amount, the Inventory
     Amount or the Additional Rental Equipment Amount reflected on the Draft
     Computation, the Representative may, within thirty (30) days after receipt
     of the Draft Computation, deliver a notice (an "Objection Notice") to the
     Purchaser setting forth the Representative's calculation of the Net Working
     Capital Amount and the Inventory Amount as of the close of business on the
     day before the Closing Date and of the Additional Rental Equipment Amount.
     The Purchaser and the Representative will use reasonable efforts to resolve
     any disagreements as to the computation of the Net Working Capital Amount,
     the Inventory Amount, and the Rental Equipment Amount, but if they do not
     obtain a final resolution within 30 days after the Purchaser has received
     the Objection Notice, the Purchaser and the Representative will jointly
     retain an independent accounting firm of recognized national or regional
     standing (the "Firm") to resolve any remaining disagreements.  If the
     Purchaser and the Representative are unable to agree on the choice of the
     Firm, the Firm will be a "big-five" accounting firm (or successor thereof)
     selected by lot (after excluding one firm designated by the Purchaser and
     one firm designated by the Representative).  The Purchaser and the
     Representative will direct the Firm to render a determination within 15
     days of its retention and the Purchaser, the Representative and their
     respective agents will cooperate with the Firm during its engagement.  The
     Firm will consider only those items and amounts in the Draft Computation
     set forth in the Objection Notice which the Purchaser and the
     Representative are unable to resolve. The Firm's determination will be
     based on the definitions of Net Working Capital Amount, Inventory Amount
     and Additional Rental Equipment Amount included herein.  The determination
     of the Firm will be conclusive and binding upon the Purchaser and the
     Sellers. The Purchaser and the Sellers shall bear the costs and expenses of
     the Firm based on the percentage which the portion of the contested amount
     not awarded to each Party bears to the amount actually contested by such
     Party.  The Net Working Capital Amount, the Inventory Amount and the
     Additional Rental Equipment Amount, as finally determined pursuant to this
     Section 2.3(b), is referred to herein as the "Actual Net Working Capital
     Amount", the "Actual Inventory Amount" and the "Actual Additional Rental
     Equipment Amount," respectively.

          (ii)  If the Actual Net Working Capital Amount is less than 
     $4,398,000, the Sellers shall pay to the Purchaser, within two (2) business
     days of the determination thereof, the amount of such shortfall. If the
     Actual Net Working Capital amount is greater than $4,398,000, the Purchaser
     shall pay to the Representative (on behalf of the Sellers), within two (2)
     business days of the determination thereof, the amount of such excess.

          (iii)  In addition to the foregoing, if the Actual Inventory Amount is
     less than $1,500,000, the Sellers shall pay to the Purchaser, within two
     (2) business days of the determination thereof, the amount of such
     shortfall.  There shall be no adjustment pursuant to this Section
     2.3(b)(iii) in the event the Actual Inventory Amount is greater than
     $1,500,000.

                                      -8-
<PAGE>
 
          (iv)  In addition to the forgoing, the Purchaser shall pay to the
     Representative (on behalf of the Sellers), within two (2) business days
     after the determination thereof, an amount equal to the Actual Additional
     Rental Equipment Amount.

          (v)  All amounts to be paid pursuant to this Section 2.3(b) shall be
     paid by wire transfer or delivery of other immediately available funds.

          (c)  Post Closing Accounts Receivable Adjustment.  Notwithstanding
anything herein to the contrary, and in addition to any other adjustments set
forth in this Agreement, the Cash Portion will be reduced dollar-for-dollar by
the aggregate amount of the accounts receivable of the Company, net of any
aggregate amount accrued for doubtful accounts in accordance with GAAP and net
of any applicable credits for sales tax and returns of items consistent with
past custom and practice calculated on a consolidated basis, in existence as of
the Closing Date and utilized in determining the Actual Net Working Capital
Amount (the "Closing Accounts Receivable"), which are uncollected by the Company
or its Subsidiaries (the "Uncollected Receivables Amount") as of the 180th day
following the Closing Date (the "Receivables Determination Date").  For the
purpose of determining amounts collected by the Company with respect to the
Closing Accounts Receivable, (i) if an account debtor specifies that a payment
should be applied to a particular invoice, such payment shall be applied to such
invoice and (ii) if an account debtor does not specify to which invoice a
payment should be applied, such payment shall be applied to the oldest
outstanding invoice due from that account debtor.  If there is an Uncollected
Receivables Amount, the Sellers shall pay the Uncollected Receivables Amount to
the Purchaser, within two (2) business days after the Receivables Determination
Date by wire transfer or delivery of other immediately available funds.  The
Company shall not be required to retain a collection agency, bring any suit, or
take any other action out of the Ordinary Course of Business to collect any of
the Closing Accounts Receivable.  If the Company receives any remittance from or
on behalf of any account debtor with respect to any Closing Accounts Receivable
after payment is made by the Sellers pursuant to this Section 2.3(c) (each an
"Additional Collection") then the Purchaser shall pay to the Representative (on
behalf of the Sellers) within two (2) business days of the receipt of such
Additional Collection the amount of such Additional Collection by wire transfer
or delivery of other immediately available funds.  To the extent that the
Company has not collected the full amount of the Closing Accounts Receivable and
the Purchaser has been paid by the Sellers in accordance with this Section
2.3(c), the Company shall reassign any such uncollected Closing Accounts
Receivable to the Representative on behalf of the Sellers.

          2.4  Closing Transactions.

          (a)   Closing.  The closing of the transactions contemplated by this
Agreement (the "Closing") shall take place at the offices of Kirkland & Ellis,
200 East Randolph Drive, Chicago, Illinois 60601, commencing at 10:00 a.m. 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 at such other place or on such other date
as may be mutually agreeable to the Purchaser and the Representative.  The date
and time of the Closing are herein referred to as the "Closing Date."  The
Closing shall be deemed to occur on, and be effective as of, September 1, 1998.

                                      -9-
<PAGE>
 
          (b)  Closing Transactions.  Subject to the conditions set forth in 
this Agreement, the Parties shall consummate the following transactions (the
"Closing Transactions") on the Closing Date:

          (i)  each Seller shall deliver to the Purchaser certificates
     representing the Acquired Stock owned by such Seller, duly endorsed for
     transfer or accompanied by duly executed stock powers with all requisite
     state and federal transfer stamps affixed thereto, and with signatures
     guaranteed by a commercial bank or by a member firm of the New York Stock
     Exchange;

          (ii)  the Purchaser shall repay, or cause to be repaid, on behalf of
     the Company and its Subsidiaries, all amounts necessary to discharge fully
     the then outstanding balance of the Company's and its Subsidiary's
     Indebtedness (including, without limitation, prepayment penalties and
     premiums) by wire transfer of immediately available funds as directed by
     the holders of such Indebtedness at or prior to the Closing, and the
     Representative shall deliver to Purchaser all appropriate payoff letters
     and shall make arrangements reasonably satisfactory to Purchaser for such
     holders to deliver lien releases and canceled notes at the Closing;

          (iii)  the Purchaser shall deliver to Sellers the Cash Portion in the
     manner set forth on the Schedule of Stockholders in immediately available
     funds;

          (iv)  the Purchaser shall deposit $8,000,000 in an escrow account
governed by the escrow agreement referred to in section 3.1(h),

          (v)  the Purchaser shall deliver the Note to the Representative; and

          (vi)  the Company, the Sellers and the Purchaser, as applicable, shall
     deliver the opinions, certificates and other documents and instruments
     required to be delivered by or on behalf of such Party under Article III.


                                  ARTICLE III

                         ADDITIONAL CLOSING DELIVERIES
                         -----------------------------

          3.1  Sellers' Deliveries.  At the Closing the Sellers shall deliver 
the following to the Purchaser:

          (a)  All consents by third parties that are required for the transfer
of the Acquired Stock to the Purchaser, and the consummation of the other
transactions contemplated hereby or that are required in order to prevent a
breach of, a default under, a termination or modification of, or any
acceleration of, any obligations under any material contract to which the
Company or any of its Subsidiaries is a party, and payoff letters with respect
to all of the Company's and its Subsidiaries' Indebtedness outstanding as of the
Closing and releases of any and all Liens held by third parties against property
of the Company or any of its Subsidiaries, all on terms reasonably satisfactory
to the Purchaser;

                                     -10-
<PAGE>
 
          (b)  All governmental filings, authorizations and approvals that are
required for the transfer of the Acquired Stock to the Purchaser and the
consummation of the other transactions contemplated hereby;

          (c)  Effective resignations of all of the Company's and each of its
Subsidiaries' directors and officers;

          (d)  Employment agreements between the Company and each of  Stephen A.
Shaughnessy and James B. Burokas relating to such individual's employment with
the Company (the "Employment Agreements"), substantially in the form of Exhibit
B attached hereto;

          (e)  Lease agreements with respect to each facility from which the
Company now conducts its business (the "Leases"), substantially in the form of
Exhibit C attached hereto;

          (f)  Supply agreements between the Company and each of S&A and BCR
substantially in the form of Exhibit E attached hereto (a "Supply Agreement");

          (g)  An opinion, dated the Closing Date, of Hill & Barlow, a
Professional Corporation, counsel to the Company and the Sellers, substantially
in the form of Exhibit D attached hereto;

          (h)  An escrow agreement substantially in the form of Exhibit F
attached hereto relating to the matters addressed in that certain litigation now
pending in the Superior Court Department of the Trial Court of the Commonwealth
of Massachusetts, Civil Action No. 97-4866 (Middlesex County);

          (i)  Certified copies of the resolutions of the Company's board of
directors and shareholders approving the transactions contemplated by this
Agreement;

          (j)  With respect to the Company and each of its Subsidiaries,
certificates of the secretary of state of such company's state of incorporation
and each state where such company is qualified to do business providing that
such company is in good standing in such jurisdiction;

          (k)  All documents and records relating to the business of the Company
or any of its Subsidiaries that are in any Seller's possession, subject to the
provisions of Section 8.9 hereof;

          (l)  Landlord consents and estoppel certificates from the Company's 
and each of its Subsidiaries' landlords in form and substance reasonably
satisfactory to the Purchaser and its lenders;

          (m)  The "Schedule of Transferred Employees" which contains a list of
the employees of the Company that will terminate their employment with the
Company as of the Closing Date and subsequently be employed by an Affiliate of
the Company and a list of the employees of any Affiliate of the Company that
provided services to the Company immediately prior to the Closing Date; and

                                     -11-
<PAGE>
 
          (n)  Such other documents or instruments as the Purchaser may
reasonably request to effect the transactions contemplated hereby.

          3.2  Purchaser's Deliveries.  At the Closing the Purchaser shall
deliver the following to the Representative:

          (a)  Employment agreements between the Company and each of Stephen A.
Shaughnessy and James B. Burokas;

          (b)  Leases with respect to each facility from which the Company now
conducts its business;

          (c)  Certified copies of the resolutions of the Purchaser's board of
directors approving the transactions contemplated by this Agreement;

          (d)  Certificate of the secretary of state of Delaware providing that
the Purchaser is in good standing in such jurisdiction;

          (e)  Such other documents or instruments as the Sellers may reasonably
request to effect the transactions contemplated hereby; and

          (f)  An opinion, dated as of the Closing Date, of Kirkland & Ellis, a
partnership including professional corporations, counsel to the Purchaser,
substantially in the form of Exhibit G attached hereto.


                                  ARTICLE IV

                        REPRESENTATIONS AND WARRANTIES
                            CONCERNING THE COMPANY
                            ----------------------

          As a material inducement to Purchaser to enter into this Agreement,
each Seller hereby represents and warrants that:

          4.1  Organization and Corporate Power.  The Company and each of its 
Subsidiaries is a corporation duly organized, validly existing and in good
standing under the laws of its state of incorporation and is qualified to do
business in every jurisdiction in which it is required to be qualified.  The
jurisdictions of incorporation of the Company and each of its Subsidiaries and
all jurisdictions in which such company is qualified to do business are set
forth on the "Organization Schedule" attached hereto.  The Company and each of
its Subsidiaries has full power and authority and all licenses, permits and
authorizations necessary to own and operate its properties and to carry on its
business as now conducted.  Correct and complete copies of the Company's and
each of its Subsidiaries' articles of incorporation and by-laws have been
furnished to the Purchaser, which documents reflect all amendments made thereto
at any time prior to the date of this Agreement.  Correct and complete copies of
the minute books containing the records of

                                     -12-
<PAGE>
 
meetings of the stockholders and board of directors, the stock certificate books
and the stock record books of the Company and each of its Subsidiaries have been
furnished to the Purchaser.  Neither the Company nor any of its Subsidiaries is
in default under or in violation of any provision of its articles of
incorporation or by-laws.

          4.2  Authorization of Transactions.  The Company has full corporate 
power and authority to execute and deliver the Transaction Documents and to
consummate the transactions contemplated hereby and thereby. The board of
directors of the Company has duly approved the Transaction Documents and has
duly authorized the execution and delivery of the Transaction Documents and the
consummation of the transactions contemplated thereby. No other corporate
proceedings on the part of the Company or any of its stockholders or
Subsidiaries are necessary to approve and authorize the execution and delivery
of the Transaction Documents and the consummation of the transactions
contemplated thereby. All of the Transaction Documents have been duly executed
and delivered by the Company and constitute the valid and binding agreements of
the Company, enforceable against the Company in accordance with their terms.

          4.3  Capitalization.  The authorized, issued and outstanding stock of 
the Company consists of 300,000 shares of Common Stock, without par value, of
which 52,000 shares are issued and outstanding. All of the issued and
outstanding shares of the Company's capital stock have been duly authorized, are
validly issued, fully paid, and nonassessable, and are held of record and
beneficially by the Sellers in the amounts set forth on the Schedule of
Stockholders and are not subject to, nor were they issued in violation of, any
preemptive rights or rights of first refusal, and are owned of record and
beneficially by the respective Sellers as set forth on the Schedule of
Stockholders free and clear of all Liens. There are no outstanding or authorized
options, warrants, rights, contracts, calls, puts, rights to subscribe,
conversion rights or other agreements or commitments to which the Company is a
party or which are binding upon the Company providing for the issuance,
disposition or acquisition of any of its capital stock (other than this
Agreement). There are no outstanding or authorized stock appreciation, phantom
stock or similar rights with respect to the Company. There are no voting trusts,
proxies or any other agreements or understandings with respect to the voting of
the capital stock of the Company. The Company is not subject to any obligation
(contingent or otherwise) to repurchase or otherwise acquire or retire any
shares of its capital stock.

          4.4  Subsidiaries; Investments.  The Company does not own or hold any 
shares of stock or any other security or interest in any other Person or any
rights to acquire any such stock or other security or interest.

          4.5  Absence of Conflicts.  Except as set forth on the "Conflicts
Schedule" attached hereto, and except for the filing requirements under the
Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the "HSR
Filing"), the execution, delivery and performance of the Transaction Documents
and the consummation of the transactions contemplated thereby by the Company and
the Sellers do not and shall not (a) conflict with or result in any breach of
any of the terms, conditions or provisions of, (b) constitute a default under,
(c) result in a violation of, (d) give any third party the right to modify,
terminate or accelerate any obligation under, (e) result in the creation of any
Lien upon the Acquired Stock or the assets of the Company or any of its
Subsidiaries, or (f) require any authorization, consent, approval, exemption or
other action by or notice or declaration to, or filing with, any court or
administrative or other governmental body or agency, under the provisions of the
articles of incorporation or by-laws of the Company or any of

                                     -13-
<PAGE>
 
its Subsidiaries or any indenture, mortgage, lease, loan agreement or other
agreement or instrument to which the Company or any of the Company's
Subsidiaries is bound, or any law, statute, rule or regulation to which the
Company or any of the Company's Subsidiaries is subject or any judgment, order
or decree to which the Company or any of the Company's Subsidiaries is subject.

          4.6  Financial Statements and Related Matters.

          (a)  Financial Statements.  Attached hereto as the "Financial
Statements Schedule" are copies of the Company's (i) unaudited consolidated and
consolidating balance sheet as of June 30, 1998 (the "Latest Balance Sheet") and
the related statements of income and cash flows for the six-month period then
ended and (ii) audited consolidated and consolidating balance sheets and
statements of income and cash flows for the fiscal years ended December 31,
1997, 1996 and 1995. Each of the foregoing financial statements (including in
all cases the notes thereto, if any) (the "Financial Statements") is accurate
and complete, is consistent with the Company's and its Subsidiaries' books and
records (which, in turn, are accurate and complete), present fairly the
Company's financial condition and results of operations as of the times and for
the periods referred to therein, and has been prepared in accordance with GAAP,
subject in the case of unaudited financial statements to changes resulting from
normal year-end adjustments for recurring accruals (which shall not be material
individually or in the aggregate) and to the absence of footnote disclosure.

          4.7  Absence of Undisclosed Liabilities.  Neither the Company nor
any of its Subsidiaries has any obligations or liabilities (whether accrued,
absolute, contingent, unliquidated or otherwise, whether or not known, whether
due or to become due and regardless of when asserted) arising out of
transactions entered into at or prior to the Closing, or any action or inaction
at or prior to the Closing, or any state of facts existing at or prior to the
Closing, except (i) obligations under contracts or commitments described on the
Contracts Schedule attached hereto or under contracts and commitments which are
not required to be disclosed thereon (but not liabilities for breaches thereof),
(ii) liabilities reflected on the liabilities side of the Latest Balance Sheet,
and (iii) liabilities which have arisen after the date of the Latest Balance
Sheet in the Ordinary Course of Business or otherwise in accordance with the
terms and conditions of this Agreement (none of which is a liability for breach
of contract, breach of warranty, tort or infringement or a claim or lawsuit or
an environmental liability).

          4.8  Absence of Certain Developments.  Except as set forth on the
"Developments Schedule" attached hereto and except as expressly contemplated by
this Agreement, since December 31, 1997, neither the Company nor any of its
Subsidiaries has:

          (a)  suffered any change that has had or could reasonably be expected
to have a Material Adverse Effect or suffered any theft, damage, destruction or
casualty loss in excess of $50,000, to its assets, whether or not covered by
insurance or suffered any substantial destruction of the its books and records;

          (b)  redeemed or repurchased, directly or indirectly, any shares of
capital stock or other equity security;

                                     -14-
<PAGE>
 
          (c)  issued, sold or transferred any equity securities, any securities
convertible, exchangeable or exercisable into shares of its capital stock or
other equity securities, or warrants, options or other rights to acquire shares
of its capital stock or other equity securities;

          (d)  incurred or become subject to any liabilities, except liabilities
incurred in the Ordinary Course of Business;

          (e)  subjected any portion of its properties or assets to any Lien;

          (f)  sold, leased, assigned or transferred (including, without
limitation, transfers to any Seller or any Insider) a portion of its tangible
assets (other than Excluded Assets), except for sales or rentals of machinery
and equipment in the Ordinary Course of Business, or canceled without fair
consideration any material debts or claims owing to or held by it;

          (g)  sold, assigned, licensed or transferred (including, without
limitation, transfers to any Seller or any Insider) any Proprietary Rights owned
by, issued to or licensed to the Company or any of its Subsidiaries or disclosed
any confidential information (other than pursuant to agreements requiring the
disclosure to maintain the confidentiality of and preserving all rights of the
Company and its Subsidiaries in such confidential information) or received any
confidential information of any third party in violation of any obligation of
confidentiality;

          (h)  suffered any extraordinary losses or waived any rights of 
material value;

          (i)  incurred any indebtedness for borrowed money (other than
indebtedness to finance its working capital needs);

          (j)  entered into, amended or terminated any material lease, contract,
agreement or commitment, or taken any other action or entered into any other
transaction other than in the Ordinary Course of Business;

          (k)  entered into any other material transaction, other than in the
Ordinary Course of Business, or materially changed any business practice;

          (l)  made or granted any bonus or any wage, salary or compensation
increase to any director, officer, employee or sales representative, group of
employees or consultant or made or granted any increase in any employee benefit
plan or arrangement, in each case other than in the Ordinary Course of Business,
or amended or terminated any existing employee benefit plan or arrangement or
adopted any new employee benefit plan or arrangement;

          (m)  made any other change in employment terms for any of its
directors, officers, and employees outside the Ordinary Course of Business;

          (n)  incurred intercompany charges or conducted its cash management
customs and practices other than in the Ordinary Course of Business (including,
without limitation, with respect to collection of accounts receivable, purchases
of inventory and supplies, repairs and maintenance, and payment of accounts
payable and accrued expenses);

                                     -15-
<PAGE>
 
          (o)  made any capital expenditures or commitments for capital
expenditures that aggregate in excess of $100,000;

          (p)  made any loans or advances to, or guarantees for the benefit of,
any Persons;

          (q)  made any charitable contributions or pledges that aggregate in
excess of $10,000;

          (r)  changed (or authorized any change) in its articles of
incorporation or by-laws; or

          (s)  agreed or committed to do any of the foregoing.

          4.9  Title to Properties.

          (a)  Owned Properties.  The Company does not own any real property.

          (b)  The leases and subleases described on the "Real Property
Schedule" attached hereto (the "Leased Properties" or the "Real Property")
constitute all of the leases and subleases under which the Company or any of its
Subsidiaries holds leasehold or subleasehold interests in real property. The
real property leases and subleases described on the Real Property Schedule are
valid, binding, enforceable and in full force and effect and have not been
modified (except to the extent disclosed in the documents delivered to the
Purchaser), and the Company or one or more of its Subsidiaries holds a valid and
existing leasehold interest under such leases or subleases to which it is a
party for the term set forth on the Real Property Schedule. The Company has
delivered to the Purchaser complete and accurate copies of each of the leases or
subleases described on the Real Property Schedule. With respect to each lease
and sublease listed on the Real Property Schedule:

          (i)     the lease or sublease shall continue to be legal, valid,
     binding, enforceable and in full force and effect on identical terms
     immediately following the Closing;

          (ii)    neither the Company, any of its Subsidiaries nor any other
     party to the lease or sublease is in breach or default, and no event has
     occurred which, with notice or lapse of time, would constitute such a
     breach or default or permit termination, modification or acceleration under
     the lease or sublease;

          (iii)   no party to the lease or sublease has repudiated any provision
     thereof and there are no disputes, oral agreements or forbearance programs
     in effect as to the lease or sublease;

          (iv)    neither the Company nor any of its Subsidiaries has assigned,
     transferred, conveyed, mortgaged, deeded in trust or encumbered any
     interest in the leasehold or subleasehold;

          (v)     all buildings, improvements or other property leased or
     subleased thereunder have received all approvals of governmental
     authorities required in connection with the operation thereof and have been
     operated and maintained in accordance with applicable laws, rules and
     regulations; and

                                     -16-
<PAGE>
 
          (vi)  to the Knowledge of the Sellers, the owner of the building,
     improvements or other real property leased or subleased has good and
     marketable title to the parcel of real property, free and clear of all
     Liens, other than (A) installments of special assessments and taxes not yet
     due and payable and (B) recorded easements, covenants and restrictions of
     record which do not impair the current use, occupancy or value, or the
     marketability of title, of the property subject thereto; and

          (vii)  the lease or sublease has been entered into and rental
expense determined according to arms length negotiations.

          (c)  The real property described on the Real Property Schedule
constitutes all of the real property used or occupied by the Company or any of
its Subsidiaries.

          (d)  Except as set forth on the "Assets Schedule" attached hereto, the
Company or one or more of its Subsidiaries owns good and marketable title to, or
a valid leasehold interest in, free and clear of all Liens, all of the personal
property and assets which are shown on the Latest Balance Sheet or acquired
thereafter or which it otherwise purports to own or used by the Company or any
of its Subsidiaries.

          (e)  The buildings, machinery, equipment, personal properties,
vehicles and other tangible assets of the Company or its Subsidiaries purported
to be owned or used in connection with the Real Property are operated in
conformity with all applicable laws and regulations, are in reasonably good
condition and repair, reasonable wear and tear excepted, and are usable in the
Ordinary Course of Business. The Company or one or more of its Subsidiaries owns
or leases under valid leases all buildings, machinery, equipment and other
tangible assets necessary for the conduct of the business of the Company and its
Subsidiaries.

EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, IT IS UNDERSTOOD AND AGREED
THAT NONE OF THE SELLERS NOR THE COMPANY IS MAKING NOR AT ANY TIME HAS MADE ANY
REPRESENTATIONS OR WARRANTIES OF ANY KIND OR CHARACTER TO THE PURCHASER, EXPRESS
OR IMPLIED, WITH RESPECT TO THE PHYSICAL CONDITION OF THE COMPANY'S RENTAL
EQUIPMENT AND INVENTORY AND THAT THE PURCHASER SHALL ACCEPT THE SAME IN THEIR
"AS IS, WHERE IS" CONDITION. THE SELLERS AND THE COMPANY SPECIFICALLY EXCLUDE
ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

          4.10  Taxes.  Except as set forth on the attached "Taxes
Schedule,"

          (a)  the Company and each of its Subsidiaries has timely filed all Tax
Returns which are required to be filed, and all such Tax Returns are true,
complete and accurate in all respects and have been prepared in compliance with
applicable law;

          (b)  all Taxes due and payable by the Company and each of its
Subsidiaries, whether or not shown on a Tax Return, have been paid by the
Company or each such Subsidiary and no Taxes are delinquent;

                                     -17-
<PAGE>
 
          (c)  the amount accrued as a current liability for taxes on the Latest
Balance Sheet shall be sufficient to pay in full all Taxes for taxable periods
(or portions thereof) ending on or before the date of the Latest Balance Sheet,
whether or not such Taxes are due on or before such date and, since the date of
the Latest Balance Sheet, neither the Company nor any of its Subsidiaries have
incurred any liability for Taxes other than in the Ordinary Course of Business;

          (d)  no deficiency for any amount of Tax which has not been resolved
has been asserted or assessed by a taxing authority against the Company or any
of its Subsidiaries, and neither the Company nor any Seller has Knowledge that
any such assessment or asserted Tax liability shall be made;

          (e)  there is no action, suit, taxing authority proceeding or audit
now in progress, pending or, to the Knowledge of the Company or any Seller,
threatened against or with respect to the Company or any of its Subsidiaries;

          (f)  neither the Company nor any of its Subsidiaries has (A) waived
any statute of limitations, (B) agreed to any extension of the period for
assessment or collection or (C) executed or filed any power of attorney, in each
case with respect to any Taxes which waiver, agreement or power of attorney is
currently in force;

          (g)  neither the Company nor any of its Subsidiaries has been a member
of an Affiliated Group (as defined in Section 1504 of the Code), or any similar
group defined under local, state or foreign Tax law and neither the Company nor
any of its Subsidiaries has any liability for Taxes of any Person other than the
Company or its Subsidiaries under Treasury Regulations Section 1.1502-6 or any
similar provision of local, state or foreign Tax law;

          (h)  neither the Company nor any of its Subsidiaries is a party to or
bound by any Tax allocation, sharing, indemnity or similar agreement or
arrangement with any Person and neither the Company nor any of its Subsidiaries
has current or potential contractual obligation to indemnify any other Person
with respect to Taxes;

          (i)  the Company has made a valid election under Section 1362 of the
Code and any corresponding state or local tax provision (collectively the "S
Elections") to be an S corporation within the meaning of Section 1361 of the
Code for all taxable years (or portions thereof) since its inception; no such S
election has been terminated (whether voluntarily, involuntarily or
inadvertently, including, without limitation, by taking any action defined in
Section 1362(d) of the Code) since such time;

          (j)  no claim has ever been made by a taxing authority in a
jurisdiction where the Company or any of its Subsidiaries does not pay Taxes or
file Tax Returns that the Company or any such Subsidiary is or may be subject to
Taxes assessed by such jurisdiction;

          (k)  the Company and each of its Subsidiaries have withheld and paid
all Taxes required to have been withheld and paid in connection with amounts
paid or owing to any employee, creditor, independent contractor or other third
party;

                                     -18-
<PAGE>
 
          (l)   the Taxes Schedule contains a list of states, territories and
jurisdictions (whether foreign or domestic) in which the Company and each of its
Subsidiaries are required to file Tax Returns relating to their respective
businesses; and

          (m)   neither the Company nor any of its Subsidiaries will be required
to include any amount in taxable income for any taxable period (or portion
thereof) ending after the Closing Date that is attributable to any taxable
period (or portion thereof) ending on or before the Closing Date as a result of
(i) any change in method of accounting for a taxable period ending on or prior
to the Closing Date, (ii) any "closing agreement," as described in Section 7121
of the Code (or any corresponding provision of state, local or foreign income
Tax law), entered into on or before the Closing Date, (iii) any installment sale
made on or before the Closing Date, or (iv) any deferred intercompany gain
described in Treasury Regulation Section 1.15102-13 or any excess loss account
described in Treasury Regulation Section 1.1502-19 and 1.1502-32 (or any
corresponding or similar provision or administrative rule of federal, state,
local or foreign income tax law) arising on or before the Closing Date.

          4.11    Contracts and Commitments.

          (a)     Except as specifically contemplated by this Agreement and
except as set forth on the "Contracts Schedule" attached hereto, neither the
Company nor any of its Subsidiaries is currently a party to or bound by, whether
written or oral, any:

          (i)     collective bargaining agreement or contract with any labor
     union or any bonus, pension, profit sharing, retirement or any other form
     of deferred compensation plan or any stock purchase, stock option,
     hospitalization insurance or similar plan or practice, whether formal or
     informal;

          (ii)    any contract for the employment of any officer, individual
     employee or other person on a full-time or consulting basis or any
     severance agreements providing annual compensation in excess of $50,000, in
     each case that is not terminable or amendable by the Company at will;

          (iii)   agreement or indenture relating to the borrowing of money or
     to mortgaging, pledging or otherwise placing a Lien on any of its assets;

          (iv)    agreements with respect to the lending or investing of funds;

          (v)     license or royalty agreements;

          (vi)    guaranty of any obligation, other than endorsements made for
     collection;

          (vii)   lease or agreement under which it is lessor of or permits any
     third party to hold or operate any property, real or personal, owned or
     controlled by it (other than leases of equipment in the Ordinary Course of
     Business);

          (viii)  contract or group of related contracts with the same party
     continuing over a period of more than six months from the date or dates
     thereof, not terminable by it on 30 days or less notice without penalties
     or involving more than $50,000;

                                     -19-
<PAGE>
 
          (ix) contract which prohibits it from freely engaging in business
     anywhere in the world; or

          (x)  other agreement not of the type listed above that is material to
     it whether or not entered into in the Ordinary Course of Business.

          (b)  Except as disclosed on the Contracts Schedule, (i) no contract or
commitment required to be disclosed on the Contracts Schedule has been breached
or cancelled by the other party and the Company, its Subsidiaries and the
Sellers have no Knowledge of any anticipated breach by any other party to any
contract required to be set forth on the Contracts Schedule, (ii) except where
not material to the business of the Company, no customer or supplier has
indicated in writing or orally to the Company, any of its Subsidiaries or any
Seller that it shall stop or decrease the rate of business done with the Company
or any of its Subsidiaries or that it desires to renegotiate its contract or
current arrangement with  the Company of any of its Subsidiaries, (iii) the
Company and each of its Subsidiaries is not in default under or in breach of any
contract or commitment required to be disclosed on the Contracts Schedule, and
no event has occurred which with the passage of time or the giving of notice or
both would result in a default or breach thereunder, (iv) neither the Company
nor any of its Subsidiaries has any present expectation or intention of not
fully performing any obligation pursuant to any contract required to be set
forth on the Contracts Schedule,  and (v) each agreement required to be set
forth on the Contracts Schedule is a valid and binding obligation of the Company
and, to the Knowledge of the Sellers, the other parties thereto.

          (c)  The Sellers have provided the Purchaser with a true and correct
copy of all written contracts which are required to be disclosed on the
Contracts Schedule, in each case together with all amendments, waivers or other
changes thereto (all of which are disclosed on the Contracts Schedule).  The
Contracts Schedule contains an accurate and complete description of all material
terms of all oral contracts required to be set forth thereon.

          4.12  Proprietary Rights.

          (a)  The "Proprietary Rights Schedule" attached hereto sets forth a
complete and correct list of:  (i) all patented, registered or applied for
Proprietary Rights currently owned or used by the Company or any of its
Subsidiaries; (ii) all trade names, unregistered trademarks and material
unregistered copyrights currently owned or used by the Company or any of its
Subsidiaries; (iii) all licenses or other agreements to which the Company or any
of its Subsidiaries is a party, either as licensee or licensor, for any
Proprietary Rights.

          (b)  Except as set forth on the Proprietary Rights Schedule, (i) the
Company or one or more of its Subsidiaries owns and possesses without
restriction as to use, all right, title and interest in and to the Proprietary
Rights necessary for the operation of the Company's and each of its
Subsidiaries' businesses as currently conducted; (ii) neither the Company nor
any of its Subsidiaries has received within the past two years any notices of
invalidity, infringement or misappropriation from any third party with respect
to any such Proprietary Rights; (iii) neither the Company nor any of its
Subsidiaries has interfered with, infringed upon, misappropriated or otherwise
come into conflict with any Proprietary Rights of any third parties; and (iv) to
the Company's and each of its Subsidiaries' Knowledge, no third party is
currently interfering with, infringing upon, misappropriating or otherwise
coming into conflict with any Proprietary Rights of the Company or any of its
Subsidiaries.

                                     -20-
<PAGE>
 
          (c)  The transactions contemplated by this Agreement shall have no
adverse effect on the Company's or any of its Subsidiaries' right, title and
interest in and to any of their Proprietary Rights.  The Company and each of its
Subsidiaries has taken all necessary actions to maintain and protect its
Proprietary Rights and shall continue to maintain and protect those rights prior
to the Closing so as to not adversely affect the validity or enforcement of such
Proprietary Rights.

          4.13  Litigation; Proceedings.  Except as set forth on the "Litigation
Schedule" attached hereto, there are no actions, suits, proceedings, orders,
judgments, decrees or investigations pending or, to the Company's or any of its
Subsidiaries' Knowledge, threatened against the Company or any of its
Subsidiaries at law or in equity, or before or by any federal, state, municipal
or other governmental department, commission, board, bureau, agency or
instrumentality, domestic or foreign. Neither the Company nor any of its
Subsidiaries is subject to any outstanding order, judgment or decree issued by
any court or quasi-judicial or administrative agency of any federal, state,
local or foreign jurisdiction or any arbitrator.

          4.14  Brokerage.  Except as set forth on the "Brokerage Schedule"
attached hereto, there are no claims for brokerage commissions, finders' fees or
similar compensation in connection with the transactions contemplated by this
Agreement based on any arrangement or agreement made by or on behalf of the
Company or any of its Subsidiaries.

          4.15  Governmental Licenses and Permits.  The "Permits Schedule"
attached hereto contains a complete listing and summary description of all
material Licenses owned or possessed by the Company or any of its Subsidiaries
or used by the Company or any of its Subsidiaries in the conduct of their
respective businesses. Except as indicated on the Permits Schedule, the Company
and each of its Subsidiaries owns or possesses all right, title and interest in
and to all material Licenses which are deemed reasonably necessary to conduct
its business as presently conducted and shall use its reasonable efforts to
maintain all such Licenses. No loss or expiration of any License is pending or,
to the Company's or any of its Subsidiaries' Knowledge, threatened (including,
without limitation, as a result of the transactions contemplated hereby) other
than expiration in accordance with the terms thereof.

          4.16  Employees.  Except as set forth on the "Employees Schedule"
attached hereto, and except as set forth of the Schedule of Transferred
Employees, to the Knowledge of the Company or any of its Subsidiaries, no key
executive employee and no group of employees or independent contractors of the
Company or any of its Subsidiaries has any plans to terminate his, her or its
employment or relationship as an independent contractor with the Company or such
Subsidiary.  The Company and each of its Subsidiaries have complied with all
applicable laws relating to the employment of personnel and labor.  Neither the
Company nor any of its Subsidiaries has experienced any strikes, grievances,
unfair labor practices claims or other material employee or labor disputes.
Neither the Company nor any of its Subsidiaries has engaged in any unfair labor
practice.  Neither the Company nor any of its Subsidiaries has any Knowledge of
any organizational effort presently being made or threatened by or on behalf of
any labor union with respect to employees of the Company or any of its
Subsidiaries.

                                     -21-
<PAGE>
 
          4.17  Employee Benefit Plans.
                ---------------------- 

          (a)   Except as set forth on the "Benefit Plans Schedule" attached
hereto, with respect to current or former employees of the Company and each of
its Subsidiaries, neither the Company nor any of its Subsidiaries maintains or
contributes to or has any actual or potential liability with respect to any (i)
deferred compensation or bonus or retirement plans or arrangements, (ii)
qualified or nonqualified defined contribution or defined benefit plans or
arrangements which are employee pension benefit plans (as defined in Section
3(2) of the Employee Retirement Income Security Act of 1974 ("ERISA")), or (iii)
employee welfare benefit plans, (as defined in Section 3(1) of ERISA), stock
option or stock purchase plans, or material fringe benefit plans or programs
whether in writing or oral and whether or not terminated.  Except as set forth
on the Benefit Plans Schedule, neither the Company nor any of its Subsidiaries
has ever contributed to any multiemployer pension plan (as defined in Section
3(37) of ERISA), and neither the Company nor any of its Subsidiaries has ever
maintained or contributed to any defined benefit plan (as defined in Section
3(35) of ERISA).  Except as set forth on the Benefit Plans Schedule, neither the
Company nor any of its Subsidiaries maintains or contributes to any employee
welfare benefit plan which provides health, accident or life insurance benefits
to former employees, their spouses or dependents, other than in accordance with
Section 4980B of the Code ("COBRA").

          (b)  The employee benefit plans (and related trusts and insurance
contracts) set forth on the Benefit Plans Schedule comply in form and in
operation in all respects with the requirements of applicable laws and
regulations, including ERISA and the Code and the nondiscrimination rules
thereof.

          (c)  All required reports and descriptions (including Form 5500 Annual
Reports, Summary Annual Reports and Summary Plan Descriptions) with respect to
the employee benefit plans set forth on the Benefit Plans Schedule have been
properly and timely filed with the appropriate government agency and distributed
to participants as required.  The Company and each of its Subsidiaries have
complied with the requirements of COBRA.

          (d)  With respect to each employee benefit plan set forth on the
Benefit Plans Schedule, (i) there have been no prohibited transactions as
defined in Section 406 of ERISA or Section 4975 of the Code, (ii) no fiduciary
(as defined in Section 3(21) of ERISA) has any liability for breach of fiduciary
duty or any other failure to act or comply in connection with the administration
or investment of the assets of such plans, and (iii) no actions, investigations,
suits or claims with respect to the assets thereof (other than routine claims
for benefits) are pending or threatened, and neither the Company nor any of its
Subsidiaries has any Knowledge of any facts which would give rise to or could
reasonably be expected to give rise to any such actions, suits or claims.

          (e)  With respect to each of the employee benefit plans listed on the
Benefit Plans Schedule, the Sellers have furnished to the Purchaser true and
complete copies of (i) the plan documents, summary plan descriptions and
summaries of material modifications and other material employee communications,
(ii) the Form 5500 Annual Report (including all schedules and other attachments
for the most recent three years), (iii) all related trust agreements, insurance
contracts or other funding agreements which implement such plans and (iv) all
contracts relating to each such plan, including, without limitation, service
provider agreements, insurance contracts, investment management agreements and
recordkeeping agreements.

                                     -22-
<PAGE>
 
          (f)  The Company and each Subsidiary has not incurred and has no
reason to expect that it will incur, any liability to the Pension Benefit
Guaranty Corporation (other than premium payments) or otherwise under Title IV
of ERISA (including any withdrawal liability) or under the Code with respect to
any employee pension benefit plan that the Company, any Subsidiary or any member
of the Company's or Subsidiary's controlled group (within the meaning of Section
414 of the Code) maintains or ever has maintained or to which any of them
contributes, ever has contributed, or ever has been required to contribute.

          4.18  Insurance.  The "Insurance Schedule" attached hereto lists
and briefly describes each insurance policy maintained by the Company and each
of its Subsidiaries with respect to its properties, assets and business,
together with a claims history for the past five years. All of such insurance
policies are in full force and effect, and neither the Company nor any of its
Subsidiaries is in default with respect to its obligations under any such
insurance policies and neither the Company nor any of its Subsidiaries has been
denied insurance coverage.  Except as set forth on the Insurance Schedule,
neither the Company nor any of its Subsidiaries has any self-insurance or co-
insurance programs.

          4.19  Officers and Directors; Bank Accounts.  The "Officers,
Directors and Bank Accounts Schedule" attached hereto lists all officers and
directors of the Company and each of its Subsidiaries, and all bank accounts,
safety deposit boxes and lock boxes (designating each authorized signatory with
respect thereto) for the Company and each of its Subsidiaries.

          4.20  Affiliate Transactions.  Except as disclosed on the "Affiliated
Transactions Schedule" attached hereto, no Insider is a party to any agreement,
contract, commitment or transaction currently in effect with the Company or any
of its Subsidiaries. No Insider is a party to any agreement, contract,
commitment or transaction, other than those entered into on an arms-length
basis, pertaining to the business of the Company or any of its Subsidiaries or
has any interest in any property, real or personal or mixed, tangible or
intangible, used in or pertaining to the business of the Company or any of its
Subsidiaries that was not entered into on an arms-length basis.

          4.21  Compliance with Laws.  The Company, each of its Subsidiaries
and their respective officers, directors, partners, agents and employees have
complied with and are in compliance with all applicable laws, regulations and
ordinances of foreign, federal, state and local governments and all agencies
thereof which are applicable to the business, business practices (including, but
not limited to, the Company's and its Subsidiaries' marketing and sales of their
respective products and services) or any owned or leased properties of the
Company or any of its Subsidiaries and to which the Company or any of its
Subsidiaries may be subject, and no claims have been filed against the Company
or any of its Subsidiaries alleging a violation of any such laws or regulations,
and neither the Company nor any of its Subsidiaries has received notice of any
such violations.

           4.22  Environmental Matters.  Except as set forth on the
                 ---------------------
"Environmental Schedule" attached hereto:
- -----------------------                  

          (a)  The Company and each of its Subsidiaries have complied with and
are currently in compliance with all Environmental and Safety Requirements, and
neither the Company nor any of its Subsidiaries has received any oral or written
notice, report or information regarding

                                     -23-
<PAGE>
 
any liabilities (whether accrued, absolute, contingent, unliquidated or
otherwise) or any corrective, investigatory or remedial obligations arising
under Environmental and Safety Requirements which relate to the Company or to
any of its Subsidiaries or to any of their respective properties or facilities.

          (b)  Without limiting the generality of the foregoing, the Company and
each of its Subsidiaries have obtained and complied with, and are currently in
compliance with, all permits, licenses and other authorizations required
pursuant to any Environmental and Safety Requirements for the occupancy of their
respective properties or facilities or the operation of their respective
businesses.  A list of all such permits, licenses and other authorizations which
are material to the Company or to any of its Subsidiaries is set forth on the
Environmental Schedule.

          (c)  Neither this Agreement or the other Transaction Documents nor the
consummation of the transactions contemplated hereby and thereby shall impose
any obligations on the Company or any of its Subsidiaries or otherwise for site
investigation or cleanup, or notification to or consent of any government
agencies or third parties under any Environmental and Safety Requirements
(including, without limitation, any so called "transaction-triggered" or
"responsible property transfer" laws and regulations).

          (d)  None of the following exists at any property or facility owned,
occupied or operated  by the Company or any of its Subsidiaries:  (i)
underground storage tanks or surface impoundments; (ii) asbestos-containing
material in any form or condition; (iii) materials or equipment containing
polychlorinated biphenyls; or (iv) landfills.

          (e)  Neither the Company nor any of its Subsidiaries have 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, occupied or operated  any facility or property, so as to
give rise to liabilities of the Company of any of its Subsidiaries for response
costs, natural resource damages or attorneys' fees pursuant to CERCLA or any
other Environmental and Safety Requirements.

          (f)  Without limiting the generality of the foregoing, no facts,
events or conditions relating to the past or present properties, facilities or
operations of the Company or any of its Subsidiaries shall prevent, hinder or
limit continued compliance with Environmental and Safety Requirements, give rise
to any corrective, investigatory or remedial obligations pursuant to
Environmental and Safety Requirements or give rise to any other liabilities
(whether accrued, absolute, contingent, unliquidated or otherwise) pursuant to
Environmental and Safety Requirements, including, without limitation, those
liabilities relating to onsite or offsite Releases or threatened Releases of
hazardous materials, substances or wastes, personal injury, property damage or
natural resources damage.

          (g)  Neither the Company nor any of its Subsidiaries have, either
expressly or by operation of law, assumed or undertaken any liability or
corrective investigatory or remedial obligation of any other Person relating to
any Environmental and Safety Requirements.

          (h)  No Environmental Lien has attached to any property owned, leased
or operated by the Company or any of its Subsidiaries.

                                     -24-
<PAGE>
 
          4.23  Disclosure.  Neither this Agreement, the other Transaction
Documents, nor any of the schedules, attachments or Exhibits hereto, contain any
untrue statement of a material fact or omit a material fact necessary to make
each statement contained herein or therein, not misleading; there is no fact
which has not been disclosed to the Purchaser of which the Company, any of its
Subsidiaries or any of the Sellers has Knowledge which has a Material Adverse
Effect, or could reasonably be anticipated to have a Material Adverse Effect,
excluding such Material Adverse Effects resulting solely from general market
conditions.

          4.24  Closing Date.  All of the representations and warranties
contained in this Article IV and elsewhere in this Agreement and all information
delivered in any schedule, attachment or Exhibit hereto or in any writing
delivered to the Purchaser are true and correct on the date of this Agreement
and shall be true and correct on the Closing Date, except to the extent that the
Representative has advised the Purchaser otherwise in writing prior to the
Closing.


                                   ARTICLE V

             REPRESENTATIONS AND WARRANTIES CONCERNING THE SELLERS

          As a material inducement to the Purchaser to enter into this
Agreement, each Seller represents and warrants to the Purchaser that:

          5.1   Authorization of Transactions.
                
          (a)   Each such Seller that is an individual has full power, authority
and legal capacity to execute and deliver the Transaction Documents to which he
is a party and to consummate the transactions contemplated thereby and hereby.
Each seller that is an individual has duly executed and delivered all of the
Transaction Documents to which he is a party, and such Transaction Documents
constitute the valid an binding agreements of such Seller, enforceable against
such Seller in accordance with their terms.

          (b)   Each such Seller that is a trust has full power and authority to
execute and deliver the Transaction Documents to which it is a party and to
consummate the transactions contemplated hereby and thereby. The trustee of each
Seller that is a trust has duly approved the Transaction Documents to which such
Seller is a party and has duly authorized the execution and delivery of the
Transaction Documents to which such Seller is a party and the consummation of
the transactions contemplated thereby. No other proceedings on the part of such
Seller are necessary to approve and authorize the execution and delivery of the
Transaction Documents to which such Seller is a party and the consummation of
the transactions contemplated thereby. Each Seller that is a trust has duly
executed and delivered all of the Transaction Documents to which it is a party
and such Transaction Documents constitute the valid and binding agreements of
such Seller, enforceable against such Seller in accordance with their terms.

          5.2   Absence of Conflicts.  Except for the HSR Filing, neither the
execution and the delivery of this Agreement and the other documents
contemplated hereby to which such Seller is a party, nor the consummation of the
transactions contemplated hereby and thereby, shall (a) conflict with, result in
a breach of any of the provisions of, (b) constitute a default under, (c) result


                                      -25-

<PAGE>
 
in the violation of, (d) give any third party the right to terminate or to
accelerate any obligation under, (e) result in the creation of any Lien upon the
Acquired Stock owned by such Seller, or (f) require any authorization, consent,
approval, execution or other action by or notice to any court or other
governmental body, under the provisions of any indenture, mortgage, lease, loan
agreement or other agreement or instrument to which such Seller is bound or
affected, or any statute, regulation, rule, judgment, order, decree or other
restriction of any government, governmental agency or court to which such Seller
is subject. No notice to, filing with or authorization, consent or approval of
any government or governmental agency by such Seller is necessary for the
consummation of the transactions contemplated by this Agreement and the other
documents contemplated hereby to which such Seller is a party.

          5.3   Brokerage.  Except as set forth on the Brokerage Schedule, there
are no claims for brokerage commissions, finders' fees or similar compensation
in connection with the transactions contemplated by this Agreement based on any
arrangement or agreement made by or on behalf of such Seller.

          5.4   Shares.  Such Seller holds of record and owns beneficially
the shares of Acquired Stock as indicated on the Schedule of Stockholders, free
and clear of any Liens.  Such Seller is not a party to any option, warrant,
right, contract, call, put or other agreement or commitment providing for the
disposition or acquisition of any capital stock of the Company (other than this
Agreement).  Such Seller is not a party to any voting trust, proxy or other
agreement or understanding with respect to the voting of any capital stock of
the Company.

          5.5   Investment in NES Stock.  With regard to the Note, each Seller
(a) understands that the Note is convertible into shares of the Purchaser's
common stock, $.01 par vale per share (the "NES Stock"), (b) understands that
the NES Stock and the Note have not been, and will not be, registered under the
Securities Act of 1933, as amended, or under any state securities laws, and are
being offered and sold in reliance upon federal and state exemptions for
transactions not involving any public offering, (c) is acquiring the NES Stock
and the Note solely for his or its own account for investment purposes, and not
with a view to the distribution thereof, (d) is a sophisticated investor with
knowledge and experience in business and financial matters, (e) has received
certain information concerning the Purchaser and has had the opportunity to
obtain additional information as desired in order to evaluate the merits and the
risks inherent in holding the NES Stock and the Note, (f) is able to bear the
economic risk and lack of liquidity inherent in holding the NES Stock and the
Note and (g) understands that the NES Stock will be "restricted securities"
within the meaning of Rule 144 as adopted by the Securities and Exchange
Commission under the Securities Act of 1933, as amended.

          5.6   Closing Date.  All of the representations and warranties
concerning such Seller contained in this Article V and elsewhere in this
Agreement and all information delivered in any schedule, attachment or Exhibit
hereto or in any writing delivered to the Purchaser are true and correct on the
date of this Agreement and shall be true and correct on the Closing Date except
to the extent that such Seller has advised the Purchaser otherwise in writing
prior to the Closing.


                                      -26-

<PAGE>
 
                                 ARTICLE VI

            REPRESENTATIONS AND WARRANTIES CONCERNING THE PURCHASER

          As a material inducement to Sellers to enter into this Agreement, the
Purchaser hereby represents and warrants to Sellers that:

          6.1   Organization and Corporate Power.  The Purchaser is a
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware and is qualified to do business in every jurisdiction
in which it is required to be qualified, with full corporate power and authority
to enter into this Agreement and the other agreements contemplated hereby to
which the Purchaser is a party and perform its obligations hereunder and
thereunder.

          6.2   Authorization of Transaction.  The Purchaser has full corporate
power and authority to execute and deliver the Transaction Documents and to
consummate the transactions contemplated hereby and thereby. The execution,
delivery and performance of this Agreement and the other agreements contemplated
hereby to which the Purchaser is a party have been duly and validly authorized
by all requisite corporate action on the part of the Purchaser, and no other
corporate proceedings on its part are necessary to authorize the execution,
delivery or performance of this Agreement. This Agreement constitutes, and each
of the other agreements contemplated hereby to which the Purchaser is a party
shall when executed constitute, a valid and binding obligation of the Purchaser,
enforceable in accordance with their terms.

          6.3   No Violation.  The Purchaser is not subject to or obligated
under its certificate of incorporation, its by-laws, any applicable law, or rule
or regulation of any governmental authority, or any agreement or instrument, or
any license, franchise or permit, or subject to any order, writ, injunction or
decree, which would be breached or violated by its execution, delivery or
performance of this Agreement and the other agreements contemplated hereby to
which the Purchaser is a party.

          6.4   Governmental Authorities and Consents.  Except for the HSR
Filing, the Purchaser is not required to submit any notice, report or other
filing with any governmental authority in connection with the execution or
delivery by it of this Agreement and the other agreements contemplated hereby to
which the Purchaser is a party or the consummation of the transactions
contemplated hereby or thereby. Except for the HSR Filing, no consent, approval
or authorization of any governmental or regulatory authority or any other party
or person is required to be obtained by the Purchaser in connection with its
execution, delivery and performance of this Agreement and the other agreements
contemplated hereby to which the Purchaser is a party or the transactions
contemplated hereby or thereby.

          6.5   Litigation.  There are no actions, suits, proceedings or orders
pending or, to the Purchaser's Knowledge, threatened against or affecting the
Purchaser at law or in equity, or before or by any federal, state, municipal
or other governmental department, commission, board, bureau, agency or
instrumentality, domestic or foreign, which would adversely affect the
Purchaser's performance under this Agreement and the other agreements
contemplated hereby to which the Purchaser is a party or the consummation of the
transactions contemplated hereby or thereby.


                                      -27-

<PAGE>
 
          6.6   Brokerage.  There are no claims for brokerage commissions,
finders' fees or similar compensation in connection with the transactions
contemplated by this Agreement based on any arrangement or agreement made by or
on behalf of the Purchaser.

          6.7   Investment.  The Purchaser is acquiring the Acquired Stock for
investment and not with a view to any distribution thereof within the meaning of
the Securities Act of 1933, as amended.

          6.8   Closing Date.  All of the representations and warranties
contained in this Article VI and elsewhere in this Agreement and all information
delivered in any schedule, attachment or Exhibit hereto or in any writing
delivered to Sellers are true and correct on the date of this Agreement and
shall be true and correct on the Closing Date, except to the extent that the
Purchaser has advised Sellers otherwise in writing prior to the Closing.

          6.9   SEC Filings.  The Purchaser filed all of the forms, reports,
schedules, registration statements and other documents required to be filed by
the Purchaser with the Securities and Exchange Commission (the "SEC Reports").
The SEC Reports (i) complied with the requirements of the Securities Act of
1933, as amended, or the Exchange Act of 1934, as amended, as the case may be,
at and as of the times they were filed, (ii) did not at and as of the time they
were filed contain any untrue statements of a material fact or omit to state a
material fact required to be stated therein or necessary in order to make the
statements therein, in light of the circumstances under which they were made,
not misleading.


                                  ARTICLE VII

                      INDEMNIFICATION AND RELATED MATTERS

          7.1   Survival.  All representations, warranties, covenants and
agreements set forth in this Agreement or in any writing or certificate
delivered in connection with this Agreement shall survive the Closing Date and
the consummation of the transactions contemplated hereby and shall not be
affected by any examination made for or on behalf of any Party, the Knowledge of
any of such Party's officers, directors, stockholders, employees or agents, or
the acceptance of any certificate or opinion. Notwithstanding the foregoing, no
Party shall be entitled to recover for any Loss pursuant to Section 7.2(a)(i),
7.2(a)(ii) or Section 7.2(c)(i) unless written notice of a claim thereof is
delivered to the other Party prior to the Applicable Limitation Date. For
purposes of this Agreement, the term "Applicable Limitation Date" shall mean the
second anniversary of the Closing Date; provided that the Applicable Limitation
Date with respect to the following Losses shall be as follows: (i) with respect
to any Loss arising from or related to a breach of the representations and
warranties set forth in Section 4.10 (Taxes) (or in Section 4.24 (Closing Date)
with respect to Section 4.10) the Applicable Limitation Date shall be the 30th
day after expiration of the statute of limitations (including any extensions or
waivers thereto to the extent that such statute of limitations may be tolled)
applicable to the Tax which gave rise to such Loss, (ii) with respect to any
Loss arising from or related to a breach of the representations and warranties
set forth in Section 4.22 (Environmental) (or in Section 4.24 (Closing Date)
with respect to Section 4.22), the Applicable Limitation Date shall be the fifth
anniversary of the Closing Date, and (iii) with respect to any Loss arising from
or related to a breach of the representations and warranties set forth in
Section 4.1 (Organization and Corporate Power) (or in Section 4.24 (Closing
Date) with respect to Section 4.1),


                                      -28-

<PAGE>
 
Section 4.3 (Capitalization) (or in Section 4.24 (Closing Date) with respect to
Section 4.3), or Section 5.4 (Shares) (or in Section 5.6 (Closing Date) with
respect to Section 5.4), there shall be no Applicable Limitation Date (i.e.,
such representations and warranties shall survive forever).

          7.2   Indemnification.
                
          (a)   Each Seller shall severally indemnify the Purchaser, and the
Company and each of their respective officers, directors, stockholders,
employees, agents, representatives, affiliates, successors and assigns
(collectively, the "Purchaser Parties") and hold each of them harmless from and
against and pay on behalf of or reimburse such Purchaser Parties in respect of
any Loss which any such Purchaser Party may suffer, sustain or become subject
to, as a result of or relating to:

          (i)   the breach of any representation or warranty made by the Company
     or any Seller contained in this Agreement (other than in Article V of this
     Agreement) or any certificate delivered by the Company or any Seller to the
     Purchaser with respect thereto in connection with the Closing;

          (ii)  the breach of any representation or warranty made by such Seller
     contained in Article V of this Agreement or any certificate delivered by
     such Seller to the Purchaser with respect thereto in connection with the
     Closing;

          (iii) the breach of any covenant or agreement made by the Company or
     any Seller contained in this Agreement, the other Transaction Documents,
     any Exhibit hereto or any certificate delivered by the Company or any
     Seller to the Purchaser with respect thereto in connection with the
     Closing; or

          (iv)  any of the matters identified on the Special Matters Schedule
     attached hereto.

No Seller shall be liable hereunder for Losses in excess of such Seller's pro
rata portion of the Cap based on such Seller's proportionate ownership of the
Acquired Stock as set forth on the Schedule of Stockholders. Notwithstanding the
foregoing, if any such Loss arises from a breach of such Seller's representation
or warranty contained in Article V, the Purchaser Party shall proceed solely
against such breaching Seller for the entire amount of such Loss. In addition,
in each case the Purchaser Party shall have the option of recouping all or any
part of any Losses it may suffer (in lieu of seeking an equivalent amount of
indemnification to which it is entitled under this Section 7.2) by notifying any
Seller that the Purchaser is reducing the principal amount outstanding under his
or its Subordinated Note. This shall affect the timing and amount of payments
required under such Subordinated Note in the same manner as if Purchaser had
made a prepayment (without premium or penalty) thereunder (whether or not any
prepayments are permitted under such Subordinated Note).

          (b)   The indemnification provided for in Section 7.2(a)(i) and
Section 7.2(a)(ii) above is subject to the following limitations:

          (i)   the Sellers will be liable to the Purchaser Parties with respect
     to claims referred to in Section 7.2(a)(i) and Section 7.2(a)(ii) only if
     the Purchaser Party gives the Representative written notice thereof within
     the Applicable Limitation Date;


                                      -29-

<PAGE>
 
          (ii)  the Sellers will be liable to the Purchaser Parties with respect
     to claims referred to in Section 7.2(a)(i) and Section 7.2(a)(ii) (other
     than claims for breach of Section 5.4, for which there will be no such
     limit) only if the aggregate amount of all Losses relating to any and all
     claims referred to in Section 7.2(a)(i) and Section 7.2(a)(ii) exceeds
     $800,000 and then only to the extent of such excess; and
     
          (iii) the aggregate amount of all payments made by the Sellers in
     satisfaction of claims for indemnification pursuant to Section 7.2(a)(i)
     and Section 7.2(a)(ii) (other than claims for breach of Section 5.4, for
     which there will be no such limit) shall not exceed $15,000,000 (the
     "Cap").

Notwithstanding any implication to the contrary contained in this Agreement, so
long as the Purchaser Party delivers written notice of a claim to the
Representative no later than the Applicable Limitation Date, the Sellers shall
be required to indemnify the Purchaser Parties for all Losses (up to the Cap)
which the Purchaser Parties may incur in respect of the matters which are the
subject of such claim, regardless of when incurred.

          (c)   The Purchaser shall indemnify the Sellers and hold each Seller
and its officers, directors, stockholders, employees, agents, representatives,
affiliates, successors and assigns (collectively, the "Seller Parties") harmless
from and against and pay on behalf of or reimburse such Seller Party in respect
of any Loss which any Seller Party may suffer, sustain or become subject to, as
a result of or relating to:

          (i)   the breach of any representation or warranty made by the
     Purchaser contained in Article VI of this Agreement or any certificate
     delivered by the Purchaser to the Sellers with respect thereto in
     connection with the Closing;
     
          (ii)  the breach of any representation, warranty (other than
     representations or warranties set forth in Article VI), covenant or
     agreement made by the Purchaser contained in this Agreement, the other
     Transaction Documents, any Exhibit hereto or any certificate delivered by
     the Purchaser to the Sellers with respect thereto in connection with the
     Closing; or

          (iii)  any failure by the Company to comply with the Worker Adjustment
     and Retraining Notification Act, 29, U.S.C. (S)(S) 2101-2109, and related
     regulations, or any state equivalent as a result of any actions taken or
     omissions by the Purchaser, the Company or its Subsidiaries solely after
     the Closing.

          (d)   The indemnification provided for in Section 7.2(c)(i) above is
subject to the following limitations:

          (i)   The Purchaser will be liable to the Seller Parties with respect
     to claims referred to in Section 7.2(c)(i) only if the Representative gives
     the Purchaser written notice thereof within the Applicable Limitation Date;
     
          (ii)  the Purchaser will be liable to the Seller Parties with respect
     to claims referred to in Section 7.2(c)(i) only if the aggregate amount of
     all Losses relating to any and


                                      -30-

<PAGE>
 
     all claims referred to in Section 7.2(c)(i) exceeds $800,000 and then only
     to the extent of such excess; and
     
          (iii) The aggregate amount of all payments made by the Purchaser in
     satisfaction of claims for indemnification pursuant to Section 7.2(c)(i)
     shall not exceed the Cap.
     
Notwithstanding any implication to the contrary contained in this Agreement, so
long as the Representative delivers written notice of a claim to the Purchaser
no later than the Applicable Limitation Date, the Purchaser shall be required to
indemnify the Seller Parties for all Losses (up to the Cap) which the Seller
Parties may incur in respect of the matters which are the subject of such claim,
regardless of when incurred.

          (e)   If a party hereto seeks indemnification under this Article VII,
such party (the "Indemnified Party") shall give prompt, written notice to the
other party (the "Indemnifying Party") after receiving written notice of any
action, lawsuit, proceeding, investigation or other claim against it (if by a
third party) or discovering the liability, obligation or facts giving rise to
such claim for indemnification, describing the claim, the amount thereof (if
known and quantifiable), and the basis thereof; provided that the failure to so
notify the Indemnifying Party shall not relieve the Indemnifying Party of its or
his obligations hereunder except to the extent such failure shall have harmed
the Indemnifying Party. In that regard, if any action, lawsuit, proceeding,
investigation or other claim shall be brought or asserted by any third party
which, if adversely determined, would entitle the Indemnified Party to indemnity
pursuant to this Article VII, the Indemnified Party shall promptly notify the
Indemnifying Party of the same in writing, specifying in detail the basis of
such claim and the facts pertaining thereto and the Indemnifying Party shall be
entitled to participate in the defense of such action, lawsuit, proceeding,
investigation or other claim giving rise to the Indemnified Party's claim for
indemnification at its expense, and at its option (subject to the limitations
set forth below) shall be entitled to appoint lead counsel of such defense with
reputable counsel reasonably acceptable to the Indemnified Party; provided that,
as a condition precedent to the Indemnifying Party's right to assume control of
such defense, it must first agree to be fully responsible for all Losses
relating to such claims and that it will provide full indemnification to the
Indemnified Party for all Losses relating to such claim; and provided further
that the Indemnifying Party shall not have the right to assume control of such
defense and shall pay the fees and expenses of counsel retained by the
Indemnified Party, if the claim over which the Indemnifying Party seeks to
assume control (i) seeks non-monetary relief, (ii) involves criminal or quasi-
criminal allegations, (iii) involves a claim to which the Indemnified Party
reasonably believes an adverse determination would be detrimental to or injure
the Indemnified Party's reputation or future business prospects, or (iv)
involves a claim which, upon petition by the Indemnified Party, the appropriate
court rules that the Indemnifying Party failed or is failing to vigorously
prosecute or defend.

     If the Indemnifying Party is permitted to assume and control the defense
and elects to do so, the Indemnified Party shall have the right to employ
counsel separate from counsel employed by the Indemnifying Party in any such
action and to participate in the defense thereof, but the fees and expenses of
such counsel employed by the Indemnified Party shall be at the expense of the
Indemnified Party unless (i) the employment thereof has been specifically
authorized by the Indemnifying Party in writing, or (ii) the Indemnifying Party
has been advised by counsel that a reasonable likelihood exists of a conflict of
interest between the Indemnifying Party and the Indemnified Party.


                                      -31-

<PAGE>
 
     If the Indemnifying Party shall control the defense of any such claim, the
Indemnifying Party shall obtain the prior written consent of the Indemnified
Party (which shall not be unreasonably withheld) before entering into any
settlement of a claim or ceasing to defend such claim, if pursuant to or as a
result of such settlement or cessation, injunction or other equitable relief
will be imposed against the Indemnified Party or if such settlement does not
expressly unconditionally release the Indemnified Party from all liabilities and
obligations with respect to such claim.

          (f)   Amounts paid to or on behalf of Sellers or Purchaser as
indemnification shall be treated as adjustments to the Purchase Price for Tax
purposes.

          (g)   Effective upon the Closing, each Seller hereby irrevocably
waives, releases and discharges the Company from any and all liabilities and
obligations to such Seller of any kind or nature whatsoever arising on or prior
to the Closing Date, whether in his capacity as Seller hereunder, as a
stockholder, officer or director of the Company or otherwise (including, without
limitation, in respect of rights of contribution or indemnification other than
compensation as an employee of the Company), in each case whether absolute or
contingent, liquidated or unliquidated, and whether arising hereunder or under
any other agreement or understanding or otherwise at law or equity with respect
to events occurring on or prior to the Closing Date, and each Seller shall not
seek to recover any amounts in connection therewith or thereunder from the
Company.

          (h)   In connection with any indemnification claim pursuant to this
Section 7.2, the Indemnified Party agrees to cooperate in a reasonable manner
with any discovery proceedings related to such claim.

          7.3   Exclusive Remedy.  The indemnification provided in Section 7.2
shall be the sole and exclusive remedy for any inaccuracy or breach of any
representation or warranty made by any Party in this Agreement, and for any
violation of any statute, regulation or common law related to this Agreement,
except that this Section 7.3 shall not limit any Party's remedy for fraud.

          7.4   Rights to Setoff.  Notwithstanding anything to the contrary set
forth herein, (i) in the event that any of the Sellers are required to pay any
amount to the Purchaser pursuant to this Agreement, the Purchaser may, at its
option, setoff all or any portion of such amount against any amount due or to
become due to the Sellers under the Note, and (ii) in the event that any of the
Sellers or the Company breach any representation, warranty, covenant or
agreement contained in this Agreement, the Representative may, at its option,
acting on behalf of the Sellers, setoff all or any portion of the Losses which
the Purchaser Parties suffer, sustain or become subject to as a result of such
breach against any amount due or to become due to the Sellers under the Note
(provided that in the event the Representative, acting on behalf of the Sellers,
elects to setoff any such Losses against the Note, and the amount of such Losses
is greater then the remaining amount due or to become due to the Sellers under
the Note, such excess shall immediately be paid by the Sellers to the Purchaser
in accordance with the provisions of Section 7.2).


                                      -32-

<PAGE>
 
                                 ARTICLE VIII

                             ADDITIONAL AGREEMENTS

          8.1   Continuing Assistance.  Subsequent to the Closing, each Seller
and the Purchaser (at their own cost) shall assist each other (including making
records available) in the preparation of their respective Tax Returns and the
filing and execution of Tax elections, if required, as well as any audits or
litigation that ensue as a result of the filing thereof, to the extent that such
assistance is reasonably requested.

          8.2   Tax Matters.  The following provisions shall govern the
allocation of responsibility as between the Purchaser and the Sellers for
certain tax matters following the Closing Date:

          (a)   Code Section 338(h)(10) Elections.  The Sellers and the
Purchaser shall jointly make a timely election under Section 338(h)(10) of the
Code, and any applicable corresponding or similar provisions of state or local
law (the "338(h)(10) Elections"), with respect to the sale of the stock of the
Company. The Purchaser shall prepare Internal Revenue Service Form 8023 with
respect to the Company, and such other forms and schedules as are necessary or
required to make the 338(h)(10) Elections, and the Company and the Purchaser
shall execute such Form 8023, and shall take all such other acts as are
necessary to make or perfect such 338(h)(10) Elections. The allocation of the
purchase price among the Company's assets shall be made in accordance with the
"Tax Allocation Schedule" attached hereto. Such allocation shall be used in
preparing (a) Form 8023 and the schedules attached thereto for each of the
Purchaser and the Sellers, and (b) all Tax Returns. The Sellers shall pay any
income tax attributable to the making of the 338(h)(10) Elections and shall
indemnify the Purchaser and the Company against any such tax.

          (b)   Tax Periods Ending on or Before the Closing Date.  The Sellers
shall prepare or cause to be prepared and file or cause to be filed all Tax
Returns for the Company for all periods ending on or prior to the Closing Date
which are filed after the Closing Date. The Sellers shall permit the Purchaser
to review and comment on each such Tax Return described in the preceding
sentence prior to filing. The Sellers shall reimburse the Purchaser for Taxes of
the Company with respect to such periods within fifteen (15) days of payment by
the Purchaser or the Company of such Taxes to the extent the amounts of such
Taxes are not utilized in determining the Actual Net Working Capital Amount.

          (c)   Tax Periods Beginning Before and Ending After the Closing Date.
The Purchaser shall prepare or cause to be prepared and file or cause to be
filed any Tax Returns of the Company for Tax periods which begin before the
Closing Date and end after the Closing Date. The Sellers shall pay to the
Purchaser within fifteen (15) days of the date on which Taxes are paid with
respect to such periods an amount equal to the portion of such Taxes which
relates to the portion of such Taxable period ending on the Closing Date to the
extent the amounts of such Taxes are not utilized in determining the Actual
Working Capital. For purposes of this Section, in the case of any Taxes that are
imposed on a periodic basis and are payable for a Taxable period that includes
(but does not end on) the Closing Date, the portion of such Taxes which relates
to the portion of such Taxable period ending on the Closing Date shall (x) in
the case of any Taxes other than Taxes based upon or related to income, be
deemed to be the amount of such Tax for the entire Taxable period


                                      -33-

<PAGE>
 
multiplied by a fraction the numerator of which is the number of days in the
Taxable period ending on the Closing Date and the denominator of which is the
number of days in the entire Taxable period, and (y) in the case of any Tax
based upon or related to income be deemed equal to the amount which would be
payable if the relevant Taxable period ended on the Closing Date. All
determinations necessary to give effect to the foregoing allocations shall be
made in a manner consistent with prior practice of the Company.

          (d)  Cooperation on Tax Matters.
                
               (i)   The Purchaser, the Company and the Sellers shall cooperate
     fully, as and to the extent reasonably requested by the other party, in
     connection with the filing of Tax Returns and any audit, litigation or
     other proceeding with respect to Taxes. Such cooperation shall include the
     retention and (upon the other party's request) the provision of records and
     information which are reasonably relevant to any such audit, litigation or
     other proceeding and making employees available on a mutually convenient
     basis to provide additional information and explanation of any material
     provided hereunder. The Company and the Sellers agree (A) to retain all
     books and records with respect to Tax matters and pertinent to the Company
     relating to any taxable period beginning before the Closing Date until the
     expiration of the statute of limitations (and, to the extent notified by
     the Purchaser or the Sellers, any extensions thereof) of the respective
     taxable periods, and to abide by all record retention agreements entered
     into with any taxing authority, and (B) to give the other party reasonable
     written notice prior to transferring , destroying or discarding any such
     books and records and, if the other party so requests, the Company or the
     Sellers, as the case may be, shall allow the other party to take possession
     of such books and records.
     
               (ii)  The Purchaser and the Sellers further agree, upon request,
     to use their best efforts to obtain any certificate or other document from
     any governmental authority or any other Person as may be necessary to
     mitigate, reduce or eliminate any Tax that could be imposed (including, but
     not limited to, with respect to the transactions contemplated hereby).
     
          (e)  Certain Taxes.  All transfer, documentary, sales, use, stamp,
registration and other such Taxes and fees (including any penalties and
interest) incurred in connection with this Agreement, shall be paid by the
Sellers when due, and the Sellers will, at their own expense, file all necessary
Tax Returns and other documentation with respect to all such transfer,
documentary, sales, use, stamp, registration and other Taxes and fees, and, if
required by applicable law, the Purchaser will, and will cause its Affiliates
to, join in the execution of any such Tax Returns and other documentation.

          (f)  Tax Sharing Agreements.  All tax-sharing agreements or similar
agreements with respect to or involving the Company shall be terminated as of
the Closing Date and, after the Closing Date, the Company shall not be bound
thereby or have any liability thereunder.

          (g)  Real Property Holding Corporation.  The Sellers will furnish the
Purchaser prior to the Closing a certification pursuant to Treasury Regulation
(S) 1.897-2 to the effect that the Company is not a "United States real property
holding corporation" as defined in Section 897 of the Code.


                                      -34-

<PAGE>
 
          8.3  Press Releases and Announcements. Prior to the Closing Date, no
press releases related to this Agreement and the transactions contemplated
herein, or other announcements to the employees, customers or suppliers of the
Company or any of its Subsidiaries shall be issued without the mutual approval
of all Parties, except for any public disclosure which any Party in good faith
believes is required by law or regulation (in which case the disclosure shall be
prepared jointly by the Sellers and the Purchaser); provided that the Purchaser
shall be entitled to (i) disclose the transactions contemplated hereby in any
document filed with the Securities and Exchange Commission, (ii) include a
detailed description of the Company and its Subsidiaries in such filing, and
(iii) include copies of the Company's Financial Statements in such filing. After
the Closing Date, no press releases related to this Agreement and the
transactions contemplated herein, or other announcements to the employees,
customers or suppliers of the Company or any of its Subsidiaries shall be issued
without the Purchaser's consent (which shall not be unreasonably withheld).

          8.4  Further Transfers. Each Seller shall execute and deliver such
further instruments of conveyance and transfer and take such additional action
as the Purchaser may reasonably request to effect, consummate, confirm or
evidence the transfer to the Purchaser of the Acquired Stock and any other
transactions contemplated hereby.

          8.5  Specific Performance. Each Seller acknowledges that the Company's
and each of its Subsidiaries' businesses is unique and recognizes and affirms
that in the event of a breach of this Agreement by such Seller, money damages
may be inadequate and Purchaser may have no adequate remedy at law. Accordingly,
each Seller agrees that Purchaser shall have the right, in addition to any other
rights and remedies existing in its favor, to enforce its rights and such
Seller's obligations hereunder not only by an action or actions for damages but
also by an action or actions for specific performance, injunctive and/or other
equitable relief.

          8.6  Transition Assistance. Each Seller shall not in any manner take
any action which is designed, intended, or might be reasonably anticipated to
have the effect of discouraging customers, suppliers, lessors, licensors and
other business associates from maintaining the same business relationships with
the Company and/or any of its Subsidiaries after the date of this Agreement as
were maintained with the Company and/or any of its Subsidiaries prior to the
date of this Agreement.

          8.7  Expenses. Except as otherwise provided herein, each Seller and
the Purchaser shall pay all of their own fees, costs and expenses (including,
without limitation, fees, costs and expenses of legal counsel, investment
bankers, brokers or other representatives and consultants and appraisal fees,
costs and expenses) incurred in connection with the negotiation of the this
Agreement and the other agreements contemplated hereby, the performance of its
obligations hereunder and thereunder, and the consummation of the transactions
contemplated hereby and thereby (collectively, the "Transaction Expenses"); it
being understood that the Sellers shall pay the fees, costs and expenses of the
Company and its Subsidiaries and that the Company shall pay any of the Sellers'
fees, costs and expenses (including, without limitation, legal and accounting
fees, costs and expenses) arising in connection with the transactions
contemplated hereby if the transactions are not consummated. At the request of
the Sellers, the fees, costs and expenses for which they are liable pursuant to
this Section 8.7 may be deducted from the Cash Purchase Price and paid directly
to the Sellers' legal counsel, investment bankers and other agents and
representatives. To the extent that the Company pays or becomes liable with
respect to any

                                     -35-
<PAGE>
 
Transaction Expenses of the Company, any of its Subsidiaries or the Sellers, the
Cash Purchase Price shall be reduced dollar-for-dollar.

          8.8  Exclusivity. Until this Agreement is terminated by its terms,
neither the Company, any of its Subsidiaries nor the Sellers (and neither the
Company nor the Sellers shall cause or permit any Insider or agent or any other
Person acting on behalf of any Seller, the Company, or its Affiliates to), (a)
solicit, initiate or encourage the submission of any proposal or offer from any
Person (including any of them) relating to any (i) liquidation, dissolution or
recapitalization of, (ii) merger or consolidation with or into, (iii)
acquisition or purchase of assets of or any equity interest in or (iv) similar
transaction or business combination involving the Company or (b) 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 other Person to do or seek any of the foregoing. The Company and
each Seller agrees that it will discontinue immediately (and will cause any
Insider or agent or any other Person acting on behalf of any Seller, the
Company, or its Affiliates to discontinue immediately) any negotiations or
discussion with respect to any of the foregoing. Until this Agreement is
terminated by its terms, the Sellers and the Company shall notify the Purchaser
immediately if any Person makes any proposal, offer, inquiry or contact with
respect to any of the foregoing.

          8.9  Books and Records. Unless otherwise consented to in writing by
the Representative and the Purchaser, the Purchaser and the Sellers will not,
for a period of seven years following the date hereof, destroy, alter or
otherwise dispose of any of the books and records of the Company acquired by the
Purchaser hereunder or retained by any Seller without first offering to
surrender to the other Party such books and records or any portion thereof of
which the Sellers or the Purchaser may intend to destroy, alter or dispose. The
Purchaser and the Sellers will allow the other party's representatives,
attorneys and accountants access to such books and records, upon reasonable
request during such party's normal business hours, for the purpose of examining
and copying the same in connection with any matter whether or not related to or
arising out of this Agreement or the transactions contemplated hereby.

          8.10  Appointment of Representative.

          (a) Powers of Attorney. Each Seller irrevocably constitutes and
appoints Stephen A. Shaughnessy (the "Representative") as such Seller's true and
lawful agent, proxy and attorney-in-fact and agent and authorizes the
Representative acting for such Seller and in such Seller's name, place and
stead, in any and all capacities to do and perform every act and thing required
or permitted to be done in connection with the transactions contemplated by this
Agreement, as fully to all intents and purposes as such Person might or could do
in person, including, without limitation:

          (i) determine the presence (or absence) of claims for
     indemnification against the Purchaser pursuant to Section 7.2 above;

          (ii) deliver all notices required to be delivered by such Seller under
     this Agreement, including, without limitation, any notice of a claim for
     which indemnification is sought under Section 7.2 above;

                                     -36-
<PAGE>
 
          (iii)  receive all notices required to be delivered to such Seller
     under this Agreement, including, without limitation, any notice of a claim
     for which indemnification is sought under Section 7.2 above;

          (iv) take any and all action on behalf of such Seller from time to
     time as the Representative may deem necessary or desirable to defend,
     pursue, resolve and/or settle claims under this Agreement, including,
     without limitation, indemnification under Section 7.2; and

          (v) to engage and employ agents and representatives (including
     accountants, legal counsel and other professionals) and to incur such other
     expenses as he deems necessary or prudent in connection with the
     administration of the foregoing, any such expenses to be paid by the
     Sellers.

Each Seller grants unto said attorney-in-fact and agent full power and authority
to do and perform each and every act and thing necessary or desirable to be done
in connection with the transactions contemplated by this Agreement, as fully to
all intents and purposes as the undersigned might or could do in person, hereby
ratifying and confirming all that the Representative may lawfully do or cause to
be done by virtue hereof. Each Seller will, by executing this Agreement agree
that such agency, proxy and power of attorney are coupled with an interest, and
are therefore irrevocable without the consent of the Representative and shall
survive the death, incapacity, or bankruptcy of such Seller. Each Seller
acknowledges and agrees that upon execution of this Agreement, any delivery by
the Representative of any waiver, amendment, agreement, opinion, certificate or
other documents executed by the Representative or any decisions made by the
Representative pursuant to this Section 8.10, such Seller shall be bound by such
documents or decision as fully as if such Seller had executed and delivered such
documents or made such decisions.

          (b) The Representative shall not have by reason of this Agreement a
fiduciary relationship in respect of any Seller, except in respect of amounts
received on behalf of such Seller. The Representative shall not be liable to any
Seller for any action taken or omitted by him or any agent employed by him
hereunder or under any other Transaction Document, or in connection therewith,
except that the Representative shall not be relieved of any liability imposed by
law for gross negligence or willful misconduct. The Representative shall not be
liable to Sellers for any apportionment or distribution of payments made by him
in good faith, and if any such apportionment or distribution is subsequently
determined to have been made in error the sole recourse of any Seller to whom
payment was due, but not made, shall be to recover from other Sellers any
payment in excess of the amount to which they are determined to have been
entitled. The Representative shall not be required to make any inquiry
concerning either the performance or observance of any of the terms, provisions
or conditions of this Agreement.

          (c) Replacement of the Representative. Upon the death, disability or
incapacity of the initial Representative appointed pursuant to Section 8.10(a)
above, each Seller acknowledges and agrees that such Representative's executor,
guardian or legal representative, as the case may be, shall (in consultation
with Sellers) appoint a replacement reasonably believed by such person as
capable of carrying out the duties and performing the obligations of the
Representative hereunder within thirty (30) days. In the event that the
Representative resigns for any reason, the Representative shall (in consultation
with Sellers) select another representative to fill such vacancy.

                                     -37-
<PAGE>
 
Any substituted representative shall be deemed the Representative for all
purposes of this Agreement and the other Transaction Documents.

          (d) Actions of the Representative; Liability of the Representative.
Each Seller agrees that Purchaser shall be entitled to rely on any action taken
by the Representative, on behalf of the Sellers, pursuant to Section 8.10(a)
above (each, an "Authorized Action"), and that each Authorized Action shall be
binding on each Seller as fully as if such Seller had taken such Authorized
Action. The Purchaser agrees that the Representative shall have no liability to
the Purchaser for any Authorized Action, except to the extent that the
Representative is liable to the Purchaser as a Seller hereunder, and except to
the extent that such Authorized Action is found by a final order of a court of
competent jurisdiction to have constituted fraud or willful misconduct. The
Sellers severally agree to pay, and to indemnify and hold harmless the Purchaser
from and against any losses which it may suffer, sustain, or become subject to,
as the result of any claim by any Person that an Authorized Action is not
binding on, or enforceable against, the Sellers. In addition, the Sellers hereby
release and discharge the Purchaser from and against any liability arising out
of or in connection with the Representative's failure to distribute any amounts
received by the Representative on the Sellers' behalf to the Sellers.

          (e) Allocation of Payments. Subject to 7.2, whenever the Sellers are
entitled to receive any payments hereunder or are obligated to make any payments
hereunder (including those specified in Section 7.2) each Seller shall be
entitled to receive from the Purchaser or shall be obligated to pay to the
Purchaser a pro rata portion of any such payment as set forth on the Schedule of
Stockholders.

          8.11  Noncompetition, Nonsolicitation and Confidentiality.

          (a) Noncompetition. In consideration of the mutual covenants provided
for herein to the Sellers at the Closing, during the period beginning on the
Closing Date and ending on the fifth anniversary of the Closing Date (the
"Noncompete Period"), none of the Sellers (and none of the beneficiaries of any
Seller that is a trust) (collectively, the "Noncompeting Parties") shall engage,
and each of the Sellers shall cause the Noncompeting Parties that are not
themselves Sellers to not engage, (whether as an owner, operator, manager,
employee, officer, director, consultant, advisor, representative or otherwise)
directly or indirectly in Equipment Rental Services, the Millwright Business or
any other business that the Company conducts or proposes to conduct as of the
Closing Date in Massachusetts, Vermont, New Hampshire, Rhode Island,
Connecticut, New York, Maine or any other geographic area in which the Company
conducts its business as of the Closing Date (except as expressly permitted
under any employment agreement with the Company executed at the Closing as
contemplated herein); provided that ownership of less than 2% of the outstanding
stock of any publicly-traded corporation shall not be deemed to be engaging
solely by reason thereof in any of its businesses. Notwithstanding the forgoing
or any other provision of this Agreement, the Noncompeting Parties may continue
to engage in (i) the Rigging Business of S&A, (ii) the Rigging Business of BCR
and (iii) any other business specifically permitted by the Supply Agreement to
which such Noncompeting Party is a Party (if any) if, with respect to both
companies, such engagement is consistent with the past practices and customs of
the Company. The parties hereto agree that the covenant set forth in this
Section 8.11 is reasonable with respect to its duration, geographical area and
scope. If the final judgment of a court of competent jurisdiction declares that
any term or provision of this Section 8.11(a) is invalid or unenforceable, the
Parties agree that the court making the determination of invalidity or
unenforceability shall have the power to reduce the

                                     -38-
<PAGE>
 
scope, duration, or area of the term or provision, to delete specific words or
phrases, or to replace any invalid or unenforceable 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.

          (b) Nonsolicitation. Each Seller agrees that, during the Noncompete
Period, such Seller (i) shall not, shall cause the other Noncompeting Parties to
not, and shall use his best efforts not to permit such Seller's affiliates to,
directly or indirectly contact, approach or solicit for the purpose of offering
employment to or hiring (whether as an employee, consultant, agent, independent
contractor or otherwise) or actually hire any person employed by the Company or
any of its Subsidiaries within two years prior to the Closing Date or during the
Noncompete Period, without the prior written consent of the Company (provided
that the provisions of this clause (i) shall not apply with respect to those
individuals listed on the Schedule of Transferred Employees to the extent such
employees continue to be employed by an Affiliate of the Company) and (ii) shall
not induce or attempt to induce, and shall cause the other Noncompeting Parties
to not induce or attempt to induce, any customer or other business relation of
the Company or any of its Subsidiaries into any business relationship which
might materially harm the Company or any of its Subsidiaries. The term
"indirectly" as used in this Section 8.11 is intended to mean any acts
authorized or directed by or on behalf of any Seller or any person controlled by
such Seller.

          (c) Confidentiality. Each Seller shall, and shall cause the other
Noncompeting Parties to, treat and hold as confidential any information
concerning the business and affairs of the Company or any of its Subsidiaries
that is not already generally available to the public (the "Confidential
Information"), refrain from using any of the Confidential Information except in
connection with this Agreement, and deliver promptly to the Purchaser or
destroy, at the request and option of the Purchaser, all tangible embodiments
(and all copies) of the Confidential Information which are in his possession or
under his control. Notwithstanding the above, information subject to the
operation of this Section 8.11(c) shall not include information that (i) becomes
generally available to the public other than as a result of a prohibited
disclosure by the party seeking to make such disclosure or use (or any of its
representatives), or (ii) is rightfully disclosed to the party seeking to make
such disclosure or use on a non-confidential basis by a source other than the
party seeking to dispute such disclosure or use or any of their representatives.
In the event that any Noncompeting Party 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, the Sellers shall cause such Noncompeting
Party to notify the Purchaser promptly of the request or requirement so that the
Purchaser may seek an appropriate protective order or waive compliance with the
provisions of this Section 8.11(c). If, in the absence of a protective order or
the receipt of a waiver hereunder, any Noncompeting Party is, on the advice of
counsel, compelled to disclose any Confidential Information to any tribunal or
else stand liable for contempt, such Noncompeting Party may disclose the
Confidential Information to the tribunal; provided that the Sellers shall cause
such disclosing Noncompeting Party shall use his best efforts to obtain, at the
request of the Purchaser, an order or other assurance that confidential
treatment shall be accorded to such portion of the Confidential Information
required to be disclosed as the Purchaser shall designate.

          (d) Trade Names. Except as set forth in Section 8.11(a) no Seller
shall use or permit any of his affiliates to use the "Shaughnessy Crane Service,
Inc.," "Shaughnessy Companies",

                                     -39-
<PAGE>
 
and "Shaughnessy Rental Equipments" or any names confusingly similar thereto in
any manner anywhere in the world after Closing, other than "Shaughnessy and
Ahern Company" and except with written approval of the Purchaser.

          (e) Remedy for Breach. Each Seller acknowledges and agrees that in the
event of a breach by any Seller of any of the provisions of this Section 8.11,
monetary damages shall not constitute a sufficient remedy. Consequently, in the
event of any such breach, the Company, the Purchaser and/or their respective
Subsidiaries, successors or assigns may, in addition to other rights and
remedies existing in their favor, apply to any court of law or equity of
competent jurisdiction for specific performance and/or injunctive or other
relief in order to enforce or prevent any violations of the provisions hereof,
in each case without the requirement of posting a bond or proving actual
damages.

          8.12  NES Stock. Upon conversion of the Note, each certificate
representing shares of NES Stock will be  imprinted with a legend substantially
in the following form:

     "THE SECURITIES REPRESENTED BY THIS CERTIFICATE WERE ORIGINALLY ISSUED ON
     [_______________], AND HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
     1933, AS AMENDED (THE "ACT") AND MAY NOT BE SOLD OR TRANSFERRED IN THE
     ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT UNDER THE ACT OR AN
     EXEMPTION FROM REGISTRATION THEREUNDER."

          8.13  Employee Benefits.

          (a) The Sellers shall cause S&A to assume sponsorship as of the
Closing Date of the welfare plans which provides medical, dental, life,
accidental death and dismemberment and long-term disability insurance benefits.
The Sellers shall cause S&A to keep such plan in force during the period from
the Closing Date through November 1, 1998 and Company employees shall be
eligible to receive coverage under such plan during such period. The Company
shall reimburse S&A for the cost of the provision and administration of benefits
thereunder for the Company employees during such period. Other than with respect
to reimbursement of costs pursuant to the preceding sentence, the Sellers shall
cause S&A to be responsible for all other liabilities and obligations under such
plan, including, but not limited to, filing Form 5500 annual reports.

          (b) The Sellers shall cause S&A to assume sponsorship of The
Shaughnessy Companies Profit Sharing Plan as of the Closing Date. Employees of
the Company shall cease participation in The Shaughnessy Companies Profit
Sharing Plan as of the Closing Date and the Company may, in its discretion, make
a profit sharing contribution to such plan (as of the Closing Date or as soon as
practicable thereafter) with respect to the period ending on the Closing Date.
Other than with respect to the cost of the profit sharing plan contribution made
by the Company, if any, the Sellers shall cause S&A to be responsible for all
other liabilities and obligations under such plan, including, but not limited
to, filing Form 5500 annual reports.

          (c) Employees of S&A shall cease participation in The Shaughnessy
Companies 401(k) Plan and the Shaughnessy Crane Service, Inc. Cafeteria Plan as
of the Closing Date.

                                     -40-
<PAGE>
 
                                  ARTICLE IX

                                 MISCELLANEOUS
                                 -------------

          9.1  Amendment and Waiver. This Agreement may be amended and any
provision of this Agreement may be waived, provided that any such amendment or
waiver shall be binding upon a Party only if such amendment or waiver is set
forth in a writing executed by the Purchaser and the Representative. No course
of dealing between or among any persons having any interest in this Agreement
shall be deemed effective to modify, amend or discharge any part of this
Agreement or any rights or obligations of any Party under or by reason of this
Agreement.

          9.2  Notices. All notices, demands and other communications given or
delivered under this Agreement shall be in writing and shall be deemed to have
been given when personally delivered, two days after being mailed by first class
mail, with proof of return receipt, or one day after being deposited with
express courier service, with proof of signature of receipt by such service or,
if using Federal Express, left at the establishment's front door, or when
telecopied (with electronic confirmation of receipt). Notices, demands and
communications to each Seller shall, unless another address is specified in
writing, or unless receipt of notice has been specifically delegated to the
Representatives under this Agreement, be sent to the address or telecopy number
indicated on the signature page attached hereto, and notices, demands and
communications to the Representative, the Company and the Purchaser shall,
unless another address is specified in writing, be sent to the address or
telecopy number indicated below:


Notice to the Representative:                   with a copy to:
- ----------------------------                    -------------- 

Stephen A. Shaughnessy                          Hill & Barlow
3 Elias Lane                                    One International Place
Milton, MA 02186                                Boston, MA 02110-2607
Telecopy: (617) 850-0318                        Telecopy: (617) 428-3500
                                                Attn.: Terrence W. Mahoney, Esq.


Notices to the Company (if prior to closing):   with a copy to:
- --------------------------------------------    -------------- 

Shaughnessy Crane Service, Inc.                 Hill & Barlow
346 D. Street                                   One International Place
South Boston, MA 02127                          Boston, MA 02110-2607
Telecopy: (617) 850-0318                        Telecopy: (617) 428-3500
Attn.: Stephen A. Shaughnessy                   Attn.: Terrence W. Mahoney, Esq.


Notices to the Company (if after closing):      with a copy to:
- -----------------------------------------       -------------- 

Shaughnessy Crane Service, Inc.                 Kirkland & Ellis
c/o National Equipment Services, Inc.           200 East Randolph Drive
1800 Sherman Ave., Suite 100                    Chicago, IL  60601
Evanston, IL 60201                              Telecopy:  (312) 861-2200
Telecopy: (847) 733-1078                        Attn.: Sanford E. Perl, Esq.
Attn.: Chief Executive Officer

                                     -41-
<PAGE>
 
Notices to Purchaser:                             with a copy to:
- --------------------                              -------------- 

National Equipment Services, Inc.                 Kirkland & Ellis
1800 Sherman Ave., Suite 100                      200 East Randolph Drive
Evanston, IL 60201                                Chicago, IL  60601
Telecopy: (847) 733-1078                          Telecopy:  (312) 861-2200
Attn.: Chief Executive Officer                    Attn.: Sanford E. Perl, Esq.

          9.3  Binding Agreement; Assignment. This Agreement and all of the
provisions hereof shall be binding upon and inure to the benefit of the Parties
and their respective successors and permitted assigns; provided that neither
this Agreement nor any of the rights, interests or obligations hereunder may be
assigned by any Seller without the prior written consent of Purchaser or by
Purchaser (except as otherwise provided in this Agreement) without the prior
written consent of each Seller. Without limiting the generality of the
foregoing:

          (a) the Purchaser may at any time prior to the Closing, at its sole
discretion, assign, in whole or in part, its rights, but not its obligations,
pursuant to this Agreement to one or more of its wholly-owned Subsidiaries. The
Purchaser's "wholly-owned Subsidiaries" include Subsidiaries which may be
organized subsequent to the date hereof;

          (b) the Purchaser may assign its rights under this Agreement for
collateral security purposes to any lender providing financing to the Purchaser,
the Company, or any of their Affiliates and any such lender may exercise all of
the rights and remedies of the Purchaser hereunder; and

          (c) the Purchaser may assign its rights under this Agreement, in whole
or in part, to any subsequent purchaser of the Company or any material portion
of its assets (whether such sale is structured as a sale of stock, a sale of
assets, a merger or otherwise).

          9.4  Severability. Whenever possible, each provision of this Agreement
shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be prohibited
by or invalid under applicable law, such provision shall be ineffective only to
the extent of such prohibition or invalidity, without invalidating the remainder
of such provisions or the remaining provisions of this Agreement.

          9.5  No Strict Construction. The language used in this Agreement shall
be deemed to be the language chosen by the Parties to express their mutual
intent, and no rule of strict construction shall be applied against any Person.

          9.6  Captions. The captions used in this Agreement are for convenience
of reference only and do not constitute a part of this Agreement and shall not
be deemed to limit, characterize or in any way affect any provision of this
Agreement, and all provisions of this Agreement shall be enforced and construed
as if no captions had been used in this Agreement.

          9.7  Entire Agreement. This Agreement and the documents referred to
herein contain the entire agreement between the Parties and supersede any prior
negotiations, understandings, agreements or representations by or between the
Parties, written or oral, which may have related to the subject matter hereof in
any way.

                                     -42-
<PAGE>
 
          9.8  Counterparts. This Agreement may be executed in multiple
counterparts, each of which shall be deemed an original but all of which taken
together shall constitute one and the same instrument.

          9.9  Governing Law.  All questions concerning the construction,
validity and interpretation of this Agreement shall be governed by and construed
in accordance with the domestic laws of the State of Illinois, without giving
effect to any choice of law or conflict of law provision (whether of the State
of Illinois or any other jurisdiction) that would cause the application of the
laws of any jurisdiction other than the State of Illinois.

          9.10  Parties in Interest.  Nothing in this Agreement, express or
implied, is intended to confer on any person other than the Parties and their
respective successors and assigns any rights or remedies under or by virtue of
this Agreement.

          9.11  Performance. The beneficiaries of each Seller that is a trust
shall (i) personally guaranty the obligations of such Seller pursuant to the
Transaction Documents to which such Seller is a party and (ii) indemnify and
hold harmless the Purchaser Parties with respect to the obligations of such
Seller pursuant to the Transaction Document to which such Seller is a party.

                 *          *          *          *          *
<PAGE>
 

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


NATIONAL EQUIPMENT SERVICES, INC.        STOCKHOLDERS OF
                                         SHAUGHNESSY CRANE SERVICE, INC.

By:  /s/ Dennis O'Connor                 /s/ John J. Shaughnessy 
     -------------------------------     ---------------------------------------
Its: Chief Financial Officer             John J. Shaughnessy
                                         

SHAUGHNESSY CRANE SERVICE, INC.          Address: 91 Longmeadow Road
                                                  ------------------------------
                                                  Milton, MA 02186
By:  /s/ Michael Shaughnessy                      ------------------------------
     -------------------------------     Telecopy: (617) 268-1993
Its: Clerk                                        ------------------------------
     -------------------------------

                                         /s/ Mary E. Shaughnessy
                                         ---------------------------------------
                                         Mary E. Shaughnessy

                                         Address:  91 Longmeadow Road
                                                   -----------------------------
                                                   Milton, MA 02186
                                                   -----------------------------
                                         Telecopy: (617) 268-1993
                                                   -----------------------------


                                         /s/ John J. Shaughnessy, III
                                         ---------------------------------------
                                         John Joseph Shaughnessy, III

                                         Address:  156 Prospect Street
                                                   -----------------------------
                                                   Hingham, MA 02043
                                                   -----------------------------
                                         Telecopy: (617) 268-3338
                                                   -----------------------------


                                         /s/ Susan M. Harrison
                                         ---------------------------------------
                                         Susan Mary Harrison

                                         Address:  120 Old Schoolhouse Lane
                                                   -----------------------------
                                                   Hanover, MA 02339
                                                   -----------------------------
                                         Telecopy: (617) 268-1993
                                                   -----------------------------
<PAGE>
 

                                         STOCKHOLDERS OF
                                         SHAUGHNESSY CRANE SERVICE, INC.
                                         (continued)

                                         /s/ James A. Shaughnessy
                                         ---------------------------------------
                                         James A. Shaughnessy

                                         Address:  619 Main Street
                                                   -----------------------------
                                                   Hanover, MA 02339
                                                   -----------------------------
                                         Telecopy: (617) 268-1993
                                                   -----------------------------


                                          /s/ Michael P. Shaughnessy
                                          --------------------------------------
                                          Michael P. Shaughnessy

                                          Address: 241 Leavitt Street
                                                   -----------------------------
                                                   Hingham, MA 02043
                                                   -----------------------------
                                         Telecopy: (617) 268-1993
                                                   -----------------------------

 
                                         /s/ Stephen A. Shaughnessy
                                         ---------------------------------------
                                         Stephen A. Shaughnessy

                                         Address:  3 Elias Lane
                                                   -----------------------------
                                                   Milton, MA 02186
                                                   -----------------------------
                                         Telecopy: (617) 268-1993
                                                   -----------------------------


                                         JOHN J. SHAUGHNESSY 1979 TRUST
                                         FOR HIS CHILDREN AND OTHERS

                                         By:       /s/ Martin Hall
                                                   -----------------------------
                                         Name:     Martin Hall (also referred to
                                                   as Martin A. Cameron-Hall)
                                         Title:    Trustee
                                         Address:  c/o Ropes & Gray
                                                   -----------------------------
                                                   One International Place
                                                   -----------------------------
                                                   Boston, MA 02110
                                                   -----------------------------
                                         Telecopy: (617) 951-7050  
                                                   -----------------------------
<PAGE>
 

                                         STOCKHOLDERS OF
                                         SHAUGHNESSY CRANE SERVICE, INC.
                                         (continued)

                                         JOHN J. SHAUGHNESSY 1987 TRUST
                                         FOR HIS GRANDCHILDREN

                                         By:       /s/ Martin Hall
                                                   -----------------------------
                                         Name:     Martin Hall (also referred to
                                                   as Martin A. Cameron-Hall)
                                         Title:    Trustee
                                         Address:  c/o Ropes & Gray
                                                   -----------------------------
                                                   One International Place
                                                   -----------------------------
                                                   Boston, MA 02110
                                                   -----------------------------
                                         Telecopy: (617) 951-7050
                                                   -----------------------------


                                         JOHN J. SHAUGHNESSY 1988 TRUST
                                         FOR HIS CHILDREN

                                         By:       /s/ Martin Hall
                                                   -----------------------------
                                         Name:     Martin Hall (also referred to
                                                   as Martin A. Cameron-Hall)
                                         Title:    Trustee
                                         Address:  c/o Ropes & Gray   
                                                   -----------------------------
                                                   One International Place
                                                   -----------------------------
                                                   Boston, MA 02110
                                                   -----------------------------
                                         Telecopy: (617) 951-7050
                                                   -----------------------------

<PAGE>
 
                                                                     Exhibit 4.1
                                                                     -----------



          The payment of principal and interest on this Note is subject to
          certain subordination provisions set forth in Section 3 herein and
          certain setoff rights set forth in Section 10 herein and Section 7.4
          of the Purchase Agreement (as defined herein). This Note was
          originally issued on September 17, 1998 and has not been registered
          under the Securities Act of 1933, as amended, or any comparable state
          securities law.


                       NATIONAL EQUIPMENT SERVICES, INC.
                JUNIOR SUBORDINATED CONVERTIBLE PROMISSORY NOTE


September 17, 1998                                                   $15,000,000


          National Equipment Services, Inc., a Delaware corporation (the
"Issuer"), hereby promises to pay to the Sellers severally and not jointly, in
proportion to their ownership of the Acquired Stock, the principal amount of
$15,000,000, together with interest thereon calculated from the date hereof in
accordance with the provisions of this Note.

          This Junior Subordinated Convertible Promissory Note (this "Note") was
issued pursuant to a Stock Purchase Agreement, dated as of September 17, 1998
(as amended and modified from time to time, the "Purchase Agreement"), by and
among the Issuer, Shaughnessy Crane Service, Inc., a Massachusetts corporation
(the "Company"), and the stockholders of the Company, and this Note is the
"Subordinated Convertible Promissory Note" referred to in the Purchase
Agreement. The Purchase Agreement contains terms governing the rights of the
holder of this Note, and all provisions of the Purchase Agreement are hereby
incorporated herein by reference. Except as defined in Section 7 hereof or
unless otherwise indicated herein, capitalized terms used in this Note have the
same meanings set forth in the Purchase Agreement.

          1.   Interest.  Interest shall accrue on a daily basis at the rate of
eight percent (8%) per annum (or (if less) at the highest rate then permitted
under applicable law) (calculated on the basis of a 365/366 day year, as
applicable) on the unpaid principal amount of this Note outstanding from time to
time and, to the extent permitted by applicable law, on any amount of interest
which has not been paid on the date on which it is payable until payment
thereof. Any accrued interest which for any reason has not theretofore been paid
shall be paid in full on the date on which the final principal payment on this
Note is made.

          2.   Principal.

          (a)  Subject to Section 2(b) below, the Issuer may, at any time and
from time to time, without premium or penalty, prepay all or any portion of the
outstanding principal amount of
<PAGE>
 
this Note; provided that such prepayment is not prohibited by the provisions of
Section 3 hereof. In connection with each prepayment of principal hereunder, the
Issuer shall also pay all accrued and unpaid interest on the principal amount of
the Note being repaid.

          (b)  The Issuer shall send written notice of its election to make a
prepayment on the Note (the "Prepayment Notice") to the holder of the Note by
registered or certified mail, return receipt requested. If the holder of the
Note elects to convert the principal amount of the Note rather than receive such
prepayment, the holder shall deliver written notice of its election together
with the Note to the Issuer in person or by registered or certified mail, return
receipt requested, within five (5) days after receipt by the holder of the Note
of the Prepayment Notice and such conversion shall be effected in accordance
with the terms of Section 5 hereof. In the event the holder of the Note does not
elect to convert the Note pursuant to this Section 2, on the date which is five
(5) days after the receipt by the holder of the Note of the Prepayment Notice,
the Issuer shall deliver the prepayment amount to the holder of the Note and,
upon receipt of such amount, the holder of the Note shall deliver the Note to
the Issuer.

          3.   Subordination; Restrictions on Payment.  For purposes of this
Section 3, a conversion pursuant to Section 2 above or Section 5 below shall not
be deemed to be a payment or distribution, and therefore a conversion pursuant
to Section 2 above or Section 5 below can be consummated without regard to the
limitations of this Section 3.

          (a)  Anything in this Note to the contrary notwithstanding, the
obligations of the Issuer in respect of the principal, interest, fees and
charges on this Note shall be subordinate and junior in right of payment, to the
extent and in the manner hereinafter set forth, to all Superior Debt.

          (b) In the event that the Issuer makes a general assignment for the
benefit of creditors; or an order, judgment or decree is entered adjudicating
the Issuer bankrupt or insolvent; or any order for relief with respect to the
Issuer is entered under the Federal Bankruptcy Code; or the Issuer petitions or
applies to any tribunal for the appointment of a custodian, trustee, receiver or
liquidator of the Issuer or of any substantial part of the assets of the Issuer,
or commences any proceeding relating to the Issuer under any bankruptcy,
reorganization, arrangement, insolvency, readjustment of debt, dissolution or
liquidation law of any jurisdiction; or any such petition or application is
filed, or any such proceeding is commenced, against the Issuer (collectively
referred to as an "Insolvency Event"), or upon any acceleration of Superior
Debt, then:

          (i)  the holders of Superior Debt shall be entitled to receive payment
     in full in cash of all principal, premium, interest, fees and charges then
     due on all Superior Debt (including interest, fees and charges accruing
     thereon after the commencement of any such proceedings (irrespective of
     whether such interest, fees and charges are allowed as a claim in such
     proceedings)) before the holder of this Note is entitled to receive any
     payment on account of principal, interest or other amounts due (or past
     due) upon this Note, and the holders of Superior Debt shall be entitled to
     receive for application in payment thereof any payment or distribution of
     any kind or character, whether in cash, property or securities or by set-
     off or otherwise, which may be payable or deliverable in any such
     proceedings in respect of this Note;

                                      -2-
<PAGE>
 
          (ii)    any payment or distribution of assets of the Issuer, of any
     kind or character, whether in cash, property or securities, to which the
     holder of this Note would be entitled except for the provisions of this
     Section 3(b) shall be paid or delivered by the Issuer directly to the
     holders of Superior Debt or their duly appointed agents for application of
     payment according to the priorities of such Superior Debt and ratably among
     the holders of any class of Superior Debt, for application in payment
     thereof until all Superior Debt (including interest, fees and charges
     accrued thereon after the date of commencement of such proceedings
     (irrespective of whether such interest, fees and charges are allowed as a
     claim in such proceedings)) shall have been paid in full in cash: and

          (iii)   the holder of this Note shall not assert any claim, motion,
     objection or argument in connection with any Insolvency Event unless (A)
     the holders of Superior Debt consent to any such assertion, or (B) all
     Superior Debt shall have been paid in full in cash.

          (c)  In any proceedings with respect to any Insolvency Event, the
holders of Superior Debt are authorized:

          (i)     to submit and enforce any claims on this Note either in the
     name of the holders of Superior Debt or in the name of the holder of this
     Note as the attorney-in-fact of the holder of this Note in the event such
     claims have not been submitted by the holder of this Note before ten (10)
     days prior to the date when submission of such claims is due;

          (ii)    to accept and execute receipts for any payment or distribution
     made with respect to this Note and to apply such payment or distribution to
     the payment of the Superior Debt;

          (iii)   to vote and give or make such acceptances, rejections,
     consents or approvals with respect to this Note and take all other action
     in order to enable the holders of Superior Debt to enforce all claims with
     respect to this Note; and

          (iv)    to take any action and to execute any instruments necessary to
     effectuate the foregoing, either in the name of the holders of Superior
     Debt or in the name of the holder of this Note as the attorney-in-fact of
     the holder of this Note.

          (d)  Except as set forth in Section 3(g) below, no payment of
principal or interest shall be made if there shall have occurred and be
continuing or there would exist as a result of such a payment or distribution
any default or event of default under any of the terms of any agreement relating
to, or instrument evidencing, any Superior Debt, which (whether with or without
notice, lapse of time or both) would permit the holder of such Superior Debt to
accelerate all or any portion of such Superior Debt (collectively, the "Blockage
Events"). The Issuer shall notify the holder of this Note in writing of the
occurrence of a Blockage Event on or prior to the date on which any payment is
due.

                                      -3-
<PAGE>
 
          (e)  Any amendment or modification of the terms of Section 3 of this
Note shall not be effective against any Person who was a holder of Superior Debt
prior to or at the time of such amendment or modification unless such holder of
Superior Debt so consents.

          (f)  The holders of Superior Debt may, at any time, in their
discretion, renew, amend, extend or otherwise modify the terms and provisions of
Superior Debt so held or exercise any of their rights under the Superior Debt
including, without limitation, the waiver of defaults thereunder and the
amendment of any of the terms or provisions thereof (or any notice evidencing or
creating the same), all without notice to or assent from the holder of this
Note. No compromise, alteration, amendment, renewal or other change of, or
waiver, consent or other action in respect of any liability or obligation under
or in respect of, any terms, covenants or conditions of the Superior Debt (or
any instrument evidencing or creating the same), whether or not such compromise,
alteration, amendment, renewal, change, waiver, consent or other action is in
accordance with the provisions of the Superior Debt (or any instrument
evidencing or creating the same), shall in any way alter or affect any of the
subordination provisions of this Note.

          (g)  If, notwithstanding the provisions of Section 3 of this Note, any
payment or distribution of any character (whether in cash, securities or other
property) or any security shall be received by the holder of this Note in
contravention of this Section 3 and before all the Superior Debt shall have been
paid in full in cash and after the holder of this Note has received notice of a
Blockage Event from the Issuer or a holder of Superior Debt, such payment,
distribution or security shall be held in trust for the benefit of, and shall be
immediately paid over or delivered or transferred to, the holders of Superior
Debt or their duly appointed agents for application of payment according to the
priorities of such Superior Debt and ratably among the holders of any class of
Superior Debt. Any such payments received by the holder of this Note and
delivered to the holders of the Superior Debt shall be deemed not to be a
payment on this Note for any reason whatsoever and the indebtedness under this
Note shall remain as if such erroneous payment had never been paid by the Issuer
or received by the holder of this Note. In the event of the failure of any
holder of this Note to endorse or assign any such payment, distribution or
security, each holder of any Superior Debt is hereby irrevocably authorized to
endorse or assign the same.

          (h)  No present or future holder of Superior Debt shall be prejudiced
in its right to enforce the provisions of Section 3 of this Note by any act or
failure to act on the part of the Issuer.

          (i)  If there shall exist any Blockage Event and the holder of this
Note shall have received notice thereof from the Issuer or a holder of Superior
Debt, the holder of this Note shall not take or continue any action, or exercise
or continue to exercise any rights, remedies or powers under the terms of this
Note, or exercise or continue to exercise any other right or remedy at law or
equity that such holder might otherwise possess, to collect any amount due and
payable in respect of this Note, including, without limitation, the acceleration
of this Note (and if this Note has already been accelerated, the holder will,
immediately upon becoming aware of the occurrence of such Blockage Event,
reverse such acceleration), the commencement of any foreclosure on any lien or
security interest, the filing of any petition in bankruptcy or the taking
advantage of any other insolvency law of any jurisdiction, unless and until the
Superior Debt shall have been fully and finally paid (whether in cash or such
other form of consideration acceptable to the holders of Superior Debt in their
sole

                                      -4-
<PAGE>
 
discretion) and satisfied, unless one or more of the holders of the Superior
Debt shall have accelerated the maturity of Superior Debt in an amount in excess
of $5,000,000, in which case the holder of this Note shall be entitled to
accelerate the maturity hereof but shall not be entitled to take any other
action described above and, provided further, that the holder of this Note
acknowledges and agrees that the acceleration of this Note shall immediately be
reversed if and when (A) one or more holders of Superior Debt take similar
action which results in the aggregate amount of Superior Debt to be accelerated
to be less than $5,000,000 or (B) such Superior Debt is fully and finally paid
(whether in cash or such other form of consideration acceptable to the holders
of Superior Debt in their sole discretion). Notwithstanding the foregoing or any
permissible action taken by the holder of this Note, the holder of this Note
shall not be entitled to receive any payment in contravention of the other
provisions of this Section 3, including without limitation Sections 3(b), 3(d)
and 3(g).

          (j)  If any payment or distribution to which any holder of this Note
would otherwise have been entitled but for the provisions of this Section 3
shall have been applied, pursuant to the provisions of this Section 3, to the
payment of Superior Debt, then and in such case and to such extent, the holder
of this Note (A) shall be entitled to receive from the holders of such Superior
Debt at the time outstanding any payments or distributions received by such
holders of Superior Debt in excess of the amount sufficient to pay all Superior
Debt in full (whether or not then due and whether such payment was in cash or
such other form of consideration acceptable to the holders of Superior Debt in
their sole discretion), (B) following payment in full of the Superior Debt
(whether in cash or such other form of consideration acceptable to the holders
of Superior Debt in their sole discretion), shall be entitled to receive any and
all further payments or distributions applicable to Superior Debt, and (C)
following payment in full of the Superior Debt (whether in cash or such other
form of consideration acceptable to the holders of Superior Debt in their sole
discretion), shall be subrogated to the rights of the holders of the Superior
Debt to receive distributions applicable to the Superior Debt, in each case
until this Note shall have been paid in full in cash or such other consideration
acceptable to the holder of this Note in its sole discretion. If any holder of
this Note has been subrogated to the rights of the holders of Superior Debt due
to the operation of this Section 3(j), the Issuer agrees to take all such
reasonable actions as are requested by such holder of this Note in order to
cause such holder to be able to obtain payments from the Issuer with respect to
such subrogation rights as soon as possible.

          (k)  The provisions of this Section 3 are solely for the purpose of
defining the relative rights of the holders of Superior Debt, on the one hand,
and the holder of this Note on the other, against the Issuer and its assets, and
nothing herein is intended to or shall impair, as between the Issuer and the
holder of this Note, the obligations of this Issuer which are absolute and
unconditional, to pay to the holder the principal and interest on this Note as
and when they become due and payable in accordance with their terms, or is
intended to or will affect the relative rights of the holder of this Note and
creditors of the Issuer other than the holders of the Superior Debt, nor, except
as provided in this Section 3, will anything herein or therein prevent the
holder of this Note from exercising all remedies otherwise permitted by
applicable law upon default under this Note subject to the rights, if any, under
this Section 3 of the holders of Superior Debt in respect of cash, property or
securities of the Issuer received upon the exercise of any such remedy and
subject to this Section 3.

                                      -5-
<PAGE>
 
          4.   Events of Default.

          (a)  Definition.  For purposes of this Note, an Event of Default shall
be deemed to have occurred if

          (i)     the Issuer fails to pay when due and payable (whether at
     maturity or otherwise) the full amount of principal or interest then
     accrued on this Note, and such failure to pay is not cured within ten (10)
     business days after the occurrence thereof; or
 
          (ii)    an Insolvency Event occurs.

The foregoing shall constitute Events of Default whatever the reason or cause
for any such Event of Default and whether it is voluntary or involuntary or is
effected by operation of law or pursuant to any judgment, decree or order of any
court or any order, rule or regulation of any administrative or governmental
body.

          (b)  Consequences of Events of Default. Subject to Section 3:

          (i)    If any Event of Default of the type described in Section
     4(a)(i) has occurred and is continuing, the holder of this Note may declare
     all or any portion of the outstanding principal amount of this Note
     (together with all accrued interest thereon and all other amounts due and
     payable with respect thereto) to be immediately due and payable and may
     demand immediate payment of all or any portion of the outstanding principal
     amount of this Note (together with all such other amounts then due and
     payable). If the holder of this Note demands immediate payment of all or
     any portion of this Note, the Issuer shall immediately pay to such holder
     all amounts due and payable with respect to this Note.

          (ii)    If an Event of Default of the type described in Section
     4(a)(ii) has occurred, the aggregate principal amount of this Note
     (together with all accrued interest thereon and all other amounts due and
     payable with respect thereto) shall become immediately due and payable
     without any action on the part of the holder of this Note, and the Issuer
     shall immediately pay to the holder of this Note all amounts due and
     payable with respect to this Note.

          (iii)   If any Event of Default has occurred and is continuing, the
     interest rate on this Note shall increase immediately by an increment of
     two percentage points (2%) per annum to the extent permitted by law. Any
     increase of the interest rate resulting from the operation of this
     subparagraph shall terminate as of the close of business on the date on
     which no Events of Default exist.

          (iv)    The holder of this Note shall also have any other rights which
     such holder may have been afforded under any contract or agreement at any
     time and any other rights which such holder may have pursuant to applicable
     law.

                                      -6-
<PAGE>
 
          (v)     The Issuer hereby waives diligence, presentment, protest and
     demand and notice of protest and demand, dishonor and nonpayment of this
     Note, and expressly agrees that this Note, or any payment hereunder, may be
     extended from time to time and that the holder hereof may accept security
     for this Note or release security for this Note, all without in any way
     affecting the liability of the Issuer hereunder.

          (vi)    The Issuer shall upon demand pay or reimburse the holder of
     this Note for all reasonable out-of-pocket expenses, including fees and
     expenses of counsel for holder of this Note, arising in connection with the
     enforcement of the provisions of this Note or the collection of this Note.

          5.   Conversion.
 
          (a)  At any time after the date hereof and prior to the first
anniversary of the date hereof, the holder of this Note may elect to convert the
principal amount of this Note, together with all accrued but unpaid interest
thereon (the "Conversion Amount"), into the number of shares of the Issuer's
common stock equal to (i) the Conversion Amount divided by (ii) $13.00 (as
adjusted for stock splits, stock combinations, stock dividends or
recapitalizations) (the "Shares"). Upon such conversion, the Issuer shall issue
the Shares to the Sellers in proportion to their ownership of the Acquired
Stock.

          (b)  Notwithstanding any limitations contained in Section 3 hereof, in
the event the Note has not been completely prepaid pursuant to Section 2 above
or converted pursuant to Section 5(a) above prior to the first anniversary of
the date hereof, then on the first anniversary of the date hereof, the
outstanding principal amount of this Note, together with all accrued but unpaid
interest thereon, shall automatically convert into a number of shares of the
Issuer's common stock having an aggregate Fair Market Value (as defined below)
on such date equal to the outstanding principal amount of this Note, together
with all accrued but unpaid interest thereon (the "Shares"). Upon such
conversion, the Issuer shall issue the Shares to the Sellers in proportion to
their ownership of the Acquired Stock. The "Fair Market Value" means as to any
share of the Issuer's common stock the average of the closing prices of such
security's sales on all domestic securities exchanges on which such security may
at the time be listed, or, if there have been no sales on any such exchange on
any day, the average of the highest bid and lowest asked prices on all such
exchanges at the end of such day, or, if on any day such security is not so
listed, the average of the representative bid and asked prices quoted in the
NASDAQ System as of 4:00 P.M., New York time, on such day, or, if on any day
such security is not quoted in the NASDAQ System, the average of the highest bid
and lowest asked prices on such day in the domestic over-the-counter market as
reported by the National Quotation Bureau, Incorporated, or any similar
successor organization, in each such case as of the business day prior to the
day as of which "Fair Market Value" is being determined; provided that if such
security is listed on any domestic securities exchange the term "business days"
as used in this sentence means business days on which such exchange is open for
trading. If at any time such security is not listed on any domestic securities
exchange or quoted in the NASDAQ System or the domestic over-the-counter market,
the "Fair Market Value" shall be the fair value thereof determined jointly by
the Issuer and the holder of this Note; provided that if such parties are unable
to reach agreement within a reasonable period of time, such fair value shall be

                                      -7-
<PAGE>
 
determined by an appraiser jointly selected by the Issuer and the holder of this
Note. The determination of such appraiser shall be final and binding on the
Issuer and the holder of this Note, and the fees and expenses of such appraiser
shall be paid one half by the Issuer and one half by the holder of this Note.

          (c)  The Shares will be "restricted securities" within the meaning of
Rule 144 as adopted by the Securities and Exchange Commission under the
Securities Act of 1933, as amended. Upon delivery of the Shares to the holder of
this Note, this Note shall be immediately and automatically cancelled. Promptly
after receipt of the Shares, the holder of this Note will deliver this Note to
the Issuer.

          (d)  Notwithstanding any limitations set forth in Section 3 hereof,
the issuance of certificates for the Shares shall be made without charge to the
Sellers for any issuance tax in respect thereof or other cost incurred by the
Issuer in connection with such conversion and the related issuance of the
Shares. Upon conversion of this Note, the Issuer shall take all such actions as
are necessary in order to insure that the Shares shall be validly issued, fully
paid and nonassessable. The Issuer acknowledges the right of any Seller to
specifically enforce the provisions of this Section 5.

          (e)  The Issuer shall not close its books against the transfer of
Shares issued or issuable upon conversion of this Note in any manner which
interferes with the timely conversion of this Note.

          (f)  The Issuer shall at all times reserve and keep available out of
its authorized but unissued shares of common stock, solely for the purpose of
issuance upon the conversion of this Note, such number of shares of common stock
as the Issuer reasonably believes are issuable upon the conversion of this Note.
All Shares shall, when issued, be duly and validly issued, fully paid and
nonassessable and free from all taxes, liens and charges. The Issuer shall take
all such actions as may be necessary to assure that all such Shares may be so
issued without violation of any applicable law or governmental regulation or any
requirements of any domestic securities exchange upon which shares of the
Issuer's common stock may be listed (except for official notice of issuance
which shall be immediately delivered by the Issuer upon each such issuance).

          6.   Amendment and Waiver.  Except as otherwise expressly provided
herein, the provisions of this Note may be amended and the Issuer may take any
action herein prohibited, or omit to perform any act herein required to be
performed by it, only if the Issuer has obtained the written consent of the
holder of this Note.

          7.   Definitions.  For purposes of this Note, the following terms have
the following meaning.

          "holder of the Note" or "holder of this Note" means the Representative
in his capacity as agent for the Sellers, and not in his individual capacity.

                                      -8-
<PAGE>
 
          "Person" means an individual, a partnership, a corporation, a limited
liability company, an association, a joint stock company, a trust, a joint
venture, an unincorporated organization and a governmental entity or any
department, agency or political subdivision thereof.

          "Subsidiary" means, with respect to any Person, any corporation,
limited liability company, partnership, association or other business entity of
which (i) if a corporation, a majority of the total voting power of shares of
stock entitled (without regard to the occurrence of any contingency) to vote in
the election of directors, managers or trustees thereof is at the time owned or
controlled, directly or indirectly, by that Person or one or more of the other
Subsidiaries of that Person or a combination thereof, or (ii) if a limited
liability company, partnership, association or other business entity, a majority
of the partnership or other similar ownership interest thereof is at the time
owned or controlled, directly or indirectly, by that Person or one or more
Subsidiaries of that Person or a combination thereof. For purposes hereof, a
Person or Persons shall be deemed to have a majority ownership interest in a
limited liability company, partnership, association or other business entity if
such Person or Persons shall be allocated a majority of limited liability
company, partnership, association or other business entity gains or losses or
shall be or control any managing director or general partner of such limited
liability company, partnership, association or other business entity.

          "Superior Debt" means all (i) principal of, interest and premium (if
any) on, and fees, costs and expenses related to, indebtedness for borrowed
money of the Issuer (including, without limitation, guarantees and other
contingent obligations with respect to indebtedness for borrowed money of its
Subsidiaries) owing to commercial banks, investment banks, insurance companies
and other lending institutions or entities, whether now outstanding or hereafter
created, incurred, assumed or guaranteed which is not by its terms on parity
with or subordinated to the Issuer's obligations under this Note, (ii) all
indebtedness and liabilities of the Issuer under interest rate protection
agreements (including hedges, swaps, collars or caps) extended by any
institution or entity to or for the benefit of the Issuer, and (iii) renewals,
extensions, refundings, refinancings, deferrals, restructurings, amendments and
modifications of the items described in (i) or (ii) above.

          8.   Cancellation.  Immediately after all principal and accrued
interest at any time owed on this Note has been paid in full, or, if sooner,
immediately after any Conversion, this Note shall be automatically cancelled and
the holder of this Note shall immediately surrender this Note to the Issuer for
cancellation. After cancellation of this Note, this Note shall not be reissued.

          9.   Payments.  Except pursuant to a Conversion, all payments to be
made to the holder of this Note shall be made in the lawful money of the United
States of America in immediately available funds. Payments made to the holder of
this Note shall constitute payments to the Sellers for all purposes.

          10.  Rights of Setoff.  Notwithstanding anything to the contrary set
forth herein, (i) in the event that any of the Sellers are required to pay any
amount to the Issuer pursuant to the Purchase Agreement, the Issuer may, at its
option, setoff all or any portion of such amount against any amount due or to
become due to the Sellers under this Note, and (ii) in the event that the
Sellers or the Company breach any representation, warranty, covenant or
agreement contained in the Purchase Agreement, the Representative may, at its
option, acting on behalf of the Sellers, setoff all

                                      -9-
<PAGE>
 
or any portion of the Losses which the Purchaser Parties suffer, sustain or
become subject to as a result of such breach against any amount due or to become
due to the Sellers under this Note (provided that in the event the
Representative, acting on behalf of the Sellers, elects to setoff any such
Losses against this Note, and the amount of such Losses is greater then the
remaining amount due or to become due to the Sellers under this Note, such
excess shall immediately be paid by the Sellers to the Issuer in accordance with
the provisions of Section 7.2 of the Purchase Agreement).

          11.  Place of Payment.  Payments of principal and interest shall be
delivered to the holder of this Note at the address of the holder set forth on
the Issuer's records or at such other address as is specified by prior written
notice by the holder to the Issuer.

                 *          *          *          *          *

                                      -10-
<PAGE>
 
          IN WITNESS WHEREOF, the Issuer has executed and delivered this Junior
Subordinated Convertible Promissory Note on the date first above written.

                              NATIONAL EQUIPMENT SERVICES, INC.

                              By:  /s/ Dennis O'Connor
                                   -------------------------------

                              Its: Chief Financial Officer
                                   ------------------------------- 

                                      -11-

<PAGE>
 
                                                                     Exhibit 4.2
                                                                     -----------

                             SUPPLEMENTAL INDENTURE



     Supplemental Indenture (this "Supplemental Indenture"), dated as of
September 24, 1998, by and among Shaughnessy Crane Service, Inc. (the  "New
Subsidiary Guarantor"), a direct wholly-owned subsidiary of National Equipment
Services, Inc., a Delaware corporation (the "Company"), and Harris Trust and
Savings Bank, as trustee under the indenture referred to below (the "Trustee").
Capitalized terms used herein and not defined herein shall have the meaning
ascribed to them in the Indenture (as defined below).

                              W I T N E S S E T H

     WHEREAS, the Company has heretofore executed and delivered to the Trustee
an indenture (as supplemented, the "Indenture"), dated as of November 25, 1997,
providing for the issuance of an aggregate principal amount of $100,000,000 of
10% Senior Subordinated Notes due 2004 (the "Senior Subordinated Notes");

     WHEREAS, Sections 4.16 and 11.03 of the Indenture provide that under
certain circumstances the Company is required to cause certain of its
Subsidiaries to execute and deliver to the Trustee a supplemental indenture
pursuant to which such Subsidiaries shall unconditionally guarantee all of the
Company's Obligations under the Senior Subordinated Notes pursuant to a
Subsidiary Guarantee on the terms and conditions set forth herein; and

     WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is
authorized to execute and deliver this Supplemental Indenture.

     NOW THEREFORE, in consideration of the foregoing and for other good and
valuable consideration, the receipt of which is hereby acknowledged, the New
Subsidiary Guarantor and the Trustee mutually covenant and agree for the equal
and ratable benefit of the Holders of the Senior Subordinated Notes as follows:

     1.  Capitalized Terms.  Capitalized terms used herein without definition 
shall have the meanings assigned to them in the Indenture.

     2.  Agreement to Subsidiary Guarantee.  The New Subsidiary Guarantor
hereby agrees, jointly and severally with all other Subsidiary Guarantors, to
guarantee the Company's Obligations under the Senior Subordinated Notes and the
Indenture on the terms and subject to the conditions set forth in Article 11 of
the Indenture and to be bound by all other applicable provisions of the
Indenture.
<PAGE>
 
     3.  No Recourse Against Others.  No past, present or future director,
officer, employee, incorporator, shareholder or agent of any Subsidiary
Guarantor, as such, shall have any liability for any obligations of the Company
or any Subsidiary Guarantor under the Senior Subordinated Notes, any Subsidiary
Guarantees, the Indenture or this Supplemental Indenture or for any claim based
on, in respect of, or by reason of, such obligations or their creation.  Each
Holder by accepting a Senior Subordinated Note waives and releases all such
liability.  The waiver and release are part of the consideration for issuance of
the Senior Subordinated Notes.

     4.  New York Law to Govern.  The internal law of the State of New York
shall govern and be used to construe this Supplemental Indenture.

     5.  Counterparts  The parties may sign any number of copies of this
Supplemental Indenture.  Each signed copy shall be an original, but all of them
together represent the same agreement.

     6.  Effect of Headings.  The section headings herein are for convenience 
only and shall not affect the construction hereof.

     7.  The Trustee.  The Trustee shall not be responsible in any manner
whatsoever for or in respect of the validity or sufficiency of this Supplemental
Indenture or for or in respect of the correctness of the recitals of fact
contained herein, all of which recitals are made solely by the New Subsidiary
Guarantor.

                            *          *          *
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed, all as of the date first above written.


Dated: September 24, 1998
                                    SHAUGHNESSY CRANE SERVICE, INC.

                                        /s/ Paul R. Ingersoll
                                    By:_____________________________________
                                       Name: Paul R. Ingersoll
                                       Title: Vice President, Secretary and 
                                              Assistant Treasurer


Date: September 24, 1998            HARRIS TRUST AND SAVINGS BANK,
                                      AS TRUSTEE

                                        /s/ C. Potter
                                    By:_____________________________________
                                       Name: C. Potter
                                       Title: AVP

<PAGE>
 
                                                                    Exhibit 99.1
                                                                    ------------
 
For further information:
 
At the Company:                   At Financial Relations Board:
Paul Ingersoll                    Carol Barbour            Leslie Loyet
Vice President                    General Information      Analyst Inquiries
(847) 733-1000                    (312) 266-7800           (312) 266-7800
 

FOR IMMEDIATE RELEASE
WEDNESDAY, SEPTEMBER 23, 1998


            NATIONAL EQUIPMENT SERVICES ANNOUNCES THE ACQUISITION OF
                           SHAUGHNESSY CRANE SERVICES


EVANSTON, IL, September 23, 1998--National Equipment Services, Inc. ("NES")
(NYSE: NSV), which specializes in the rental of specialty and general equipment
to industrial and construction end-users, today announced that it had completed
the acquisition of Shaughnessy Crane Services, Inc., a Boston-based crane and
high-reach rental company.

With revenues of approximately $34 million, Boston-based Shaughnessy is ranked
as the 58th largest equipment rental company in the country by the Rental
Equipment Register.  NES did not disclose financial terms of the acquisition.

"The acquisition of Shaughnessy Crane significantly enhances our presence in the
New England market and firmly establishes NES as the #1 high reach specialist in
this important geographic area. It also broadens the line of specialty equipment
we have available in New England.  As with our 11 other acquisitions in 1998, we
expect Shaughnessy to be immediately accretive to earnings," commented Kevin
Rodgers, CEO of NES.  Shaughnessy operates from five nearby locations in New
Hampshire, Rhode Island and Massachusetts.

Following the acquisition, Steve Shaughnessy will assume day-to-day-management
of Shaughnessy Crane.  The Shaughnessy family has been in the equipment service
industry for over 80 years, representing four generations of the Shaughnessy
family.

NES is a leading participant in the growing and highly fragmented $18 billion
equipment rental industry.  Through its 18 businesses acquired since January
1997, NES specializes in the rental of specialty and general equipment to
industrial and construction end-users.  The Company rents over 750 different
types of machinery and equipment and distributes new equipment for nationally
recognized original equipment manufacturers.  The Company also sells used
equipment as well as complementary parts, supplies and merchandise, and provides
repair and maintenance services to its customers.  NES is geographically
diversified, with 100 locations in 21 states, and is a leading competitor in
each of the geographic markets its serves.
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Safe Harbor Statement under the Private Securities Litigation Reform Act of
1995: The matters discussed in this news release include certain forward-looking
statements that involve specific risks and uncertainties, which could cause
actual results to differ materially from those forward-looking statements.
These include, but are not limited to, the ability of NES to complete and
integrate acquisitions, risks related to NES' growth strategy, the Company's
significant leverage, increased competition, availability of additional capital
to fund the company's future acquisitions, and other risks detailed in the
Company's recent filings with the Securities and Exchange Commission.  The
Company make no commitment to disclose any revisions to forward-looking
statements, or any facts, events or circumstances after the date hereof that may
bear upon forward-looking statements.


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