IRON MOUNTAIN INC /DE
8-K, 1999-05-11
PUBLIC WAREHOUSING & STORAGE
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT

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

 Date of Report (Date of earliest event reported): May 11, 1999 (April 19, 1999)

                           IRON MOUNTAIN INCORPORATED
             (Exact name of registrant as specified in its charter)

   Delaware                          0-27584                     04-3107342
(State or other                    (Commission                 (IRS Employer
jurisdiction of                    File Number)              Identification No.)
incorporation)


                               745 Atlantic Avenue
                           Boston, Massachusetts 02111
          (Address of principal executive offices, including zip code)




                                 (617) 535-4766
              (Registrant=s telephone number, including area code)





<PAGE>




Item 7.  Financial Statements and Exhibits

(c)      Exhibits.

Exhibit No.       Item

10.1              Indenture for 83% Senior Subordinated Notes due 2011, dated as
                  of April 26, 1999, by and among Iron Mountain,  certain of its
                  subsidiaries and The Bank of New York, as trustee.

10.2              Exchange and Registration Rights Agreement,  dated as of April
                  26,  1999,  by and among  Iron  Mountain  and  certain  of its
                  subsidiaries  and Bear,  Stearns & Co. Inc.,  Chase Securities
                  Inc.,  BNY Capital  Markets,  Inc.,  Fleet  Securities,  Inc.,
                  Prudential Securities  Incorporated and Scotia Capital Markets
                  (USA) Inc., as initial purchasers.


                                       2
<PAGE>




                                   SIGNATURES


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

                                     IRON MOUNTAIN INCORPORATED
                                     (Registrant)



                                     By: /s/ Jean A. Bua
                                         Jean A. Bua
                                         Vice President and Corporate Controller


Date:   May 11, 1999



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



                                                                    EXHIBIT 10.1




                           IRON MOUNTAIN INCORPORATED


                    8 1/4% Senior Subordinated Notes due 2011


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


                                    INDENTURE


                           Dated as of April 26, 1999

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



                              THE BANK OF NEW YORK,

                                   as Trustee



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


                             CROSS REFERENCE TABLE*

Trust Indenture
Act Section                                                  Indenture Section

310    (a)(1).............................................................7.10
       (a)(2).............................................................7.10
       (a)(3).............................................................N.A.
       (a)(4).............................................................N.A.
       (a)(5).............................................................7.10
       (b)................................................................7.10
       (c)................................................................N.A.
311    (a)................................................................7.11
       (b)................................................................7.11
       (c)................................................................N.A.
312    (a)................................................................2.05
       (b)...............................................................12.03
       (c)...............................................................12.03
313    (a)................................................................7.06
       (b)(1).............................................................N.A.
       (b)(2)........................................................7.06;7.07
       (c)..........................................................7.06;12.02
       (d)................................................................7.06
314    (a)..........................................................4.03;12.02
       (b)................................................................N.A.
       (c)(1)............................................................12.04
       (c)(2)............................................................12.04
       (c)(3).............................................................N.A.
       (d)................................................................N.A.
       (e)...............................................................12.05
       (f)................................................................N.A.
315    (a)................................................................7.01
       (b)..........................................................7.05,12.02
       (c)................................................................7.01
       (d)................................................................7.01
       (e)................................................................6.11
316    (a)(last sentence).................................................2.09
       (a)(1)(A)..........................................................6.05
       (a)(1)(B)..........................................................6.04
       (a)(2).............................................................N.A.
       (b)................................................................6.07
       (c)...............................................................2.13
317    (a)(1).............................................................6.08
       (a)(2).............................................................6.09
       (b)................................................................2.04
318    (a)...............................................................12.01
       (b)................................................................N.A.
       (c)...............................................................12.01
N.A. means not applicable.

*This Cross-Reference Table is not part of this Indenture.

                                        i
<PAGE>


<TABLE>
<CAPTION>
                                TABLE OF CONTENTS

                                                                                                           Page No.



<S>                                                                                                              <C>
ARTICLE 1.  DEFINITIONS AND INCORPORATION BY REFERENCE............................................................1
     Section 1.01. Definitions....................................................................................1
     Section 1.02. Other Definitions.............................................................................17
     Section 1.03. Incorporation by Reference of Trust Indenture Act.............................................17
     Section 1.04. Rules of Construction.........................................................................18

ARTICLE 2. THE NOTES.............................................................................................18
     Section 2.01. Form and Dating...............................................................................18
     Section 2.02. Execution and Authentication..................................................................19
     Section 2.03. Registrar, Paying Agent and Depositary........................................................20
     Section 2.04. Paying Agent to Hold Money in Trust...........................................................20
     Section 2.05. Lists of Holders of the Notes.................................................................20
     Section 2.06. Transfer and Exchange.........................................................................21
     Section 2.07. Replacement Notes.............................................................................24
     Section 2.08. Outstanding Notes.............................................................................25
     Section 2.09. Treasury Notes................................................................................25
     Section 2.10. Temporary Notes...............................................................................25
     Section 2.11. Cancellation..................................................................................25
     Section 2.12. Defaulted Interest............................................................................26
     Section 2.13. Record Date...................................................................................26
     Section 2.14. CUSIP Number..................................................................................26
     Section 2.15. Computation of Interest.......................................................................26
     Section 2.16. Exchange of Series A Notes for Series B Notes.................................................26
     Section 2.17. Legends.......................................................................................27

ARTICLE 3. REDEMPTION AND OFFERS TO PURCHASE.....................................................................28
     Section 3.01. Notices to Trustee............................................................................28
     Section 3.02. Selection of Notes to Be Redeemed.............................................................28
     Section 3.03. Notice of Redemption..........................................................................28
     Section 3.04. Effect of Notice of Redemption................................................................29
     Section 3.05. Deposit of Redemption Price...................................................................30
     Section 3.06. Notes Redeemed in Part........................................................................30
     Section 3.07. Optional Redemption...........................................................................30
     Section 3.08. Mandatory Redemption..........................................................................31
     Section 3.09. Asset Sale Offers.............................................................................31

ARTICLE 4. COVENANTS.............................................................................................33
     Section 4.01. Payment of Notes..............................................................................33
     Section 4.02. Maintenance of Office or Agency...............................................................34
     Section 4.03. Reports.......................................................................................34
     Section 4.04. Compliance Certificate........................................................................35
     Section 4.05. Taxes.........................................................................................36
     Section 4.06. Stay, Extension and Usury Laws................................................................36
     Section 4.07. Restricted Payments...........................................................................36
     Section 4.08. Dividend and Other Payment Restrictions Affecting Restricted Subsidiaries.....................38
     Section 4.09. Incurrence of Indebtedness and Issuance of Preferred Stock....................................39
     Section 4.10. Asset Sales...................................................................................40
     Section 4.11. Transactions with Affiliates..................................................................42
     Section 4.12. Liens.........................................................................................42
     Section 4.13. Additional Subsidiary Guarantees..............................................................42
     Section 4.14. Offer to Purchase Upon Change of Control......................................................43
     Section 4.15. Corporate Existence...........................................................................45
     Section 4.16. Certain Senior Subordinated Debt..............................................................45
     Section 4.17. Designation of unrestricted subsidiaries......................................................45
     Section 4.18. Limitation on Sale and Leaseback Transactions.................................................46

ARTICLE 5. SUCCESSORS............................................................................................46
     Section 5.01. Merger, Consolidation, or Sale of Assets......................................................46
     Section 5.02. Successor Corporation Substituted.............................................................47

ARTICLE 6. CERTAIN DEFAULT PROVISIONS............................................................................47
     Section 6.01. Events of Default.............................................................................47
     Section 6.02. Acceleration..................................................................................49
     Section 6.03. Other Remedies................................................................................50
     Section 6.04. Waiver of Past Defaults.......................................................................50
     Section 6.05. Control by Majority...........................................................................50
     Section 6.06. Limitation on Suits...........................................................................50
     Section 6.07. Rights of Holders of Notes to Receive Payment.................................................51
     Section 6.08. Collection Suit by Trustee....................................................................51
     Section 6.09. Trustee May File Proofs of Claim..............................................................51
     Section 6.10. Priorities....................................................................................52
     Section 6.11. Undertaking for Costs.........................................................................53

ARTICLE 7. TRUSTEE...............................................................................................53
     Section 7.01. Duties of Trustee.............................................................................53
     Section 7.02. Rights of Trustee.............................................................................54
     Section 7.03. Individual Rights of Trustee..................................................................55
     Section 7.04. Trustee's Disclaimer..........................................................................55
     Section 7.05. Notice of Defaults............................................................................55
     Section 7.06. Reports by Trustee to Holders of the Notes....................................................56
     Section 7.07. Compensation and Indemnity....................................................................56
     Section 7.08. Replacement of Trustee........................................................................57
     Section 7.09. Successor Trustee by Merger, etc..............................................................58

                                       iii

<PAGE>

     Section 7.10. Eligibility; Disqualification.................................................................58
     Section 7.11. Preferential Collection of Claims Against Company.............................................58

ARTICLE 8. LEGAL DEFEASANCE AND COVENANT DEFEASANCE..............................................................58
     Section 8.01. Option to Effect Legal Defeasance or Covenant Defeasance......................................58
     Section 8.02. Legal Defeasance and Discharge................................................................59
     Section 8.03. Covenant Defeasance...........................................................................59
     Section 8.04. Conditions to Legal or Covenant Defeasance....................................................60
     Section 8.05. Deposited Money and Government Securities to be Held in Trust; Other
                         Miscellaneous Provisions................................................................61
     Section 8.06. Repayment to Company..........................................................................62
     Section 8.07. Reinstatement.................................................................................62

ARTICLE 9. AMENDMENT, SUPPLEMENT AND WAIVER......................................................................62
     Section 9.01. Without Consent of Holders of Notes...........................................................62
     Section 9.02. With Consent of Holders of Notes..............................................................63
     Section 9.03. Compliance with Trust Indenture Act...........................................................65
     Section 9.04. Revocation and Effect of Consents.............................................................65
     Section 9.05. Notation on or Exchange of Notes..............................................................65
     Section 9.06. Trustee to Sign Amendments, etc...............................................................65

ARTICLE 10. SUBORDINATION........................................................................................65
     Section 10.01. Agreement to Subordinate.....................................................................65
     Section 10.02. Liquidation; Dissolution; Bankruptcy.........................................................66
     Section 10.03. Default on Designated Senior Debt............................................................66
     Section 10.04. Acceleration of Notes........................................................................67
     Section 10.05. When Distribution Must be Paid Over..........................................................67
     Section 10.06. Notice By Company............................................................................68
     Section 10.07. Subrogation..................................................................................68
     Section 10.08. Relative Rights..............................................................................68
     Section 10.09. Subordination May Not Be Impaired by Company.................................................68
     Section 10.10. Distribution or Notice to Representative.....................................................69
     Section 10.11. Rights of Trustee and Paying Agent...........................................................69
     Section 10.12. Authorization to Effect Subordination........................................................69
     Section 10.13. Amendments...................................................................................69

ARTICLE 11. SUBSIDIARY GUARANTEES................................................................................70
     Section 11.01. Subsidiary Guarantee.........................................................................70
     Section 11.02. Subordination................................................................................71
     Section 11.03. Liquidation; Dissolution; Bankruptcy.........................................................71
     Section 11.04. Default on Senior Debt of the Guarantor......................................................72
     Section 11.05. Acceleration of Notes........................................................................73
     Section 11.06. When Distribution Must Be Paid Over..........................................................73
     Section 11.07. Notice by a Guarantor........................................................................73
     Section 11.08. Subrogation..................................................................................74

                                       iv

<PAGE>

     Section 11.09. Relative Rights..............................................................................74
     Section 11.10. Subordination May Not Be Impaired By Any Guarantor...........................................74
     Section 11.11. Distribution or Notice to Representative.....................................................74
     Section 11.12. Rights of Trustee and Paying Agent...........................................................75
     Section 11.13. Authorization to Effect Subordination........................................................75
     Section 11.14. Amendments...................................................................................75
     Section 11.15. Limitation of Guarantor's Liability..........................................................75
     Section 11.16. Restricted Subsidiaries May Consolidate, etc., on Certain Terms..............................76
     Section 11.17. Releases Following Sale of Assets or Designation as Unrestricted Subsidiary..................76

ARTICLE 12. MISCELLANEOUS........................................................................................77
     Section 12.01. Trust Indenture Act Controls.................................................................77
     Section 12.02. Notices......................................................................................77
     Section 12.03. Communication by Holders of Notes with Other Holders of Notes................................78
     Section 12.04. Certificate and Opinion as to Conditions Precedent...........................................78
     Section 12.05. Statements Required in Certificate or Opinion................................................79
     Section 12.06. Rules by Trustee and Agents..................................................................79
     Section 12.07. No Personal Liability of Directors, Officers, Employees and Stockholders.....................79
     Section 12.08. Governing Law................................................................................79
     Section 12.09. No Adverse Interpretation of Other Agreements................................................80
     Section 12.10. Successors...................................................................................80
     Section 12.11. Severability.................................................................................80
     Section 12.12. Counterpart Originals........................................................................80
     Section 12.13. Table of Contents, Headings, etc.............................................................80
</TABLE>


                                    EXHIBITS

Exhibit A.........FORM OF NOTE
Exhibit B.........FORM OF SUPPLEMENTAL INDENTURE
Exhibit C.........FORM OF NOTATION ON NOTE RELATING TO GUARANTEE
Exhibit D.........CERTIFICATE OF TRANSFEROR
Exhibit E.........PURCHASER LETTER



                                        v
<PAGE>


                    8 1/4% Senior Subordinated Notes due 2011

                                    INDENTURE

                           Dated as of April 26, 1999

                                      among

                           IRON MOUNTAIN INCORPORATED,

                           THE RESTRICTED SUBSIDIARIES

                                       and

                        THE BANK OF NEW YORK, as Trustee



<PAGE>



                  INDENTURE  dated as of April  26,  1999  among  Iron  Mountain
Incorporated,   a  Delaware   corporation   (the   "Company"),   the  Restricted
Subsidiaries  signatories  hereto and The Bank of New York,  a New York  banking
corporation, as trustee (the "Trustee").

                  The Company, the Restricted  Subsidiaries signatory hereto and
the Trustee agree as follows for the benefit of each other and for the equal and
ratable benefit of the Holders of the 8 1/4% Senior Subordinated Notes due 2011:


                                   ARTICLE 1.

                          DEFINITIONS AND INCORPORATION
                                  BY REFERENCE

SECTION 1.01.       DEFINITIONS.

                  "Acquired Debt" means,  with respect to any specified  Person,
(a)  Indebtedness  of any other  Person  existing at the time such other  Person
merged with or into or became a Subsidiary of such specified  Person,  including
Indebtedness  incurred in connection  with, or in  contemplation  of, such other
Person  merging with or into or becoming a Subsidiary of such  specified  Person
and (b) Indebtedness encumbering any asset acquired by such specified Person.

                  "Acquisition  EBITDA" means, as of any date of  determination,
with  respect to an  Acquisition  EBITDA  Entity,  the sum of (a) EBITDA of such
Acquisition  EBITDA  Entity  for its last  fiscal  quarter  for which  financial
statements  are  available at such date of  determination  (adjusted to give pro
forma effect to any  acquisition  or disposition of a business or Person by such
Acquisition EBITDA Entity consummated during the period covered by, or after the
date of, such quarterly  financial  statements),  multiplied by four (or if such
quarterly  statements are not available,  EBITDA for the most recent fiscal year
for which financial statements are available),  plus (b) projected  quantifiable
improvements  in  operating  results  (on  an  annualized  basis)  due  to  cost
reductions  calculated  in good faith by the  Company  or one of its  Restricted
Subsidiaries,  as certified by an Officers'  Certificate filed with the Trustee,
without giving effect to any operating losses of the acquired Person.

                  "Acquisition   EBITDA  Entity"  means,   as  of  any  date  of
determination,  a business or Person (a) which has been  acquired by the Company
or one of its  Restricted  Subsidiaries  and with  respect  to  which  financial
results on a  consolidated  basis with the Company have not been made  available
for an entire fiscal  quarter or (b) which is to be acquired in whole or in part
with Indebtedness,  the incurrence of which will require the calculation on such
date of the Acquisition EBITDA of such Acquisition EBITDA Entity for purposes of
Section 4.09 hereof.

                  "Adjusted  EBITDA" means, as of any date of determination  and
without  duplication,  the sum of (a) EBITDA of the Company  and its  Restricted
Subsidiaries  for the most recent fiscal  quarter for which  internal  financial
statements are available at such date of determination,  multiplied by four, and
(b) Acquisition  EBITDA of each business or Person that is an Acquisition EBITDA
Entity as of such  date of  determination,  multiplied  by a  fraction,  (i) 

                                       1
<PAGE>

the  numerator of which is three minus the number of months  (and/or any portion
thereof ) in such most recent fiscal quarter for which the financial  results of
such Acquisition EBITDA Entity are included in the EBITDA of the Company and its
Restricted  Subsidiaries  under clause (a) above,  and (ii) the  denominator  of
which is three. The effects of unusual or non-recurring  items in respect of the
Company,  a Restricted  Subsidiary or an Acquisition  EBITDA Entity occurring in
any period shall be excluded in the calculation of Adjusted EBITDA.

                  "Affiliate"  of any  specified  Person  means any other Person
directly or indirectly  controlling or controlled by or under direct or indirect
common  control with such  specified  Person.  For purposes of this  definition,
"control"  (including,  with  correlative  meanings,  the  terms  "controlling,"
"controlled  by" and "under common control  with"),  as used with respect to any
Person, will mean the possession, directly or indirectly, of the power to direct
or cause the  direction of the  management  or policies of such Person,  whether
through the ownership of voting securities, by agreement or otherwise; provided,
however,  that beneficial ownership of 10% or more of the voting securities of a
Person shall be deemed to be control.

                  "Agent" means any Registrar, Paying Agent or co-registrar.

                  "Attributable Indebtedness" in respect of a Sale and Leaseback
Transaction means, as of the time of determination,  the greater of (a) the fair
market value of the property  subject to such  arrangement (as determined by the
Board of Directors of the Company) and (b) the present value  (discounted at the
rate of interest  implicit in such  transaction) of the total obligations of the
lessee for rental  payments  during the remaining terms of the lease included in
such Sale and Leaseback  Transaction  (including any period for which such lease
has been extended).

                  "Bankruptcy  Law" means  Title 11,  U.S.  Code or any  similar
federal or state law for the relief of debtors.

                  "Board  of  Directors"  means the  Board of  Directors  of the
Company, or any authorized committee of the Board of Directors.

                  "Business Day" means any day other than a Legal Holiday.

                  "Capital   Lease   Obligation"   means,   at  the   time   any
determination thereof is to be made, the amount of the liability in respect of a
capital  lease that would at such time be so required to be  capitalized  on the
balance sheet in accordance with GAAP.

                  "Capital   Stock"   means  any  and  all  shares,   interests,
participations,  rights or other equivalents  (however  designated) of corporate
stock, including, without limitation, with respect to partnerships,  partnership
interests  (whether  general or limited) and any other interest or participation
that  confers on a Person the right to receive a share of the profits and losses
of, or distributions of assets of, such partnership.

                  "Cash Equivalents" means (a) securities with maturities of one
year or less from the date of acquisition,  issued,  fully guaranteed or insured
by the United  States  Government or 

                                       2
<PAGE>

any agency thereof, (b) certificates of deposit,  time deposits,  overnight bank
deposits,  bankers  acceptances and repurchase  agreements issued by a Qualified
Issuer having  maturities of 270 days or less from the date of acquisition,  (c)
commercial  paper of an issuer  rated at least A-2 by  Standard & Poor's  Rating
Group, a division of McGraw Hill, Inc., or P-2 by Moody's Investors Service,  or
carrying an equivalent  rating by a nationally  recognized rating agency if both
of the two named rating  agencies cease  publishing  ratings of investments  and
having  maturities of 270 days or less from the date of  acquisition,  (d) money
market accounts or funds with or issued by Qualified Issuers and (e) Investments
in money market funds  substantially all of the assets of which are comprised of
securities and other  obligations of the types  described in clauses (a) through
(c) above.

                  "Change  of  Control"  means  the  occurrence  of  any  of the
following events:

                           (a) any  "person"  or "group" (as such terms are used
                  in Sections 13(d) and 14(d) of the Exchange  Act),  other than
                  the Principal Stockholders (or any of them), is or becomes the
                  "beneficial  owner" (as defined in Rules 13d-3 and 13d-5 under
                  the  Exchange  Act),  directly or  indirectly,  of more than a
                  majority of the voting power of all classes of Voting Stock of
                  the Company;

                           (b) the Company  consolidates with, or merges with or
                  into,  another  Person  or  conveys,   transfers,   leases  or
                  otherwise  disposes of all or substantially  all of its assets
                  to any Person, or any Person consolidates with, or merges with
                  or  into,  the  Company,  in  any  such  event  pursuant  to a
                  transaction  in  which  the  outstanding  Voting  Stock of the
                  Company is converted into or exchanged for cash, securities or
                  other property,  other than any such transaction where (i) the
                  outstanding  Voting  Stock of the Company is not  converted or
                  exchanged at all (except to the extent  necessary to reflect a
                  change in the jurisdiction of  incorporation)  or is converted
                  into  or   exchanged   for  (A)  Voting   Stock   (other  than
                  Disqualified  Stock) of the surviving or transferee  Person or
                  (B) cash,  securities and other  property  (other than Capital
                  Stock described in the foregoing  clause (A)) of the surviving
                  or  transferee  Person  in an amount  that  could be paid as a
                  Restricted  Payment  pursuant to Section  4.07 hereof and (ii)
                  immediately after such transaction, no "person" or "group" (as
                  such  terms  are  used in  Sections  13(d)  and  14(d)  of the
                  Exchange Act),  other than the Principal  Stockholders (or any
                  of them), is the "beneficial owner" (as defined in Rules 13d-3
                  and 13d-5 under the Exchange Act), directly or indirectly,  of
                  more than a majority of the total outstanding  Voting Stock of
                  the surviving or transferee Person;

                           (c)   during   any   consecutive   two-year   period,
                  individuals  who at the  beginning of such period  constituted
                  the Board of Directors  (together with any new directors whose
                  election to such Board of Directors,  or whose  nomination for
                  election by the stockholders of the Company, was approved by a
                  vote of 66 2/3% of the directors then still in office who were
                  either  directors  at the  beginning  of such  period or whose
                  election  or  nomination   for  election  was   previously  so
                  approved) 

                                       3
<PAGE>

                  cease for any reason to  constitute a majority of the Board of
                  Directors then in office; or

                           (d) the Company is  liquidated or dissolved or adopts
                  a  plan  of  liquidation  or  dissolution   other  than  in  a
                  transaction which complies with the provisions of Section 5.01
                  hereof.

                  "Company"  means  the  party  named as such in this  Indenture
until a successor  replaces it pursuant to this Indenture and  thereafter  means
the successor.

                  "Consolidated  Adjusted Net Income" means, for any period, the
net income (or net loss) of the Company and its Restricted Subsidiaries for such
period as determined on a consolidated  basis in accordance with GAAP,  adjusted
to the extent  included in calculating  such net income or loss by excluding (a)
any net  after-tax  extraordinary  gains or losses  (less all fees and  expenses
relating  thereto),  (b) any net  after-tax  gains or losses  (less all fees and
expenses relating  thereto)  attributable to Asset Sales, (c) the portion of net
income  (or  loss)  of any  Person  (other  than  the  Company  or a  Restricted
Subsidiary),  including Unrestricted  Subsidiaries,  in which the Company or any
Restricted  Subsidiary  has an ownership  interest,  except to the extent of the
amount of dividends or other  distributions  actually paid to the Company or any
Restricted  Subsidiary in cash dividends or  distributions by such Person during
such period,  and (d) the net income (or loss) of any Person  combined  with the
Company  or  any  Restricted  Subsidiary  on  a  "pooling  of  interests"  basis
attributable to any period prior to the date of combination.

                  "Consolidated  Income Tax Expense" means, for any period,  the
provision for federal,  state, local and foreign income taxes of the Company and
its  Restricted  Subsidiaries  for such period as determined  on a  consolidated
basis in accordance with GAAP.

                  "Consolidated Interest Expense" means, for any period, without
duplication,  the sum of (a) the amount which, in conformity with GAAP, would be
set forth  opposite the caption  "interest  expense" (or any like  caption) on a
consolidated   statement  of  operations  of  the  Company  and  its  Restricted
Subsidiaries for such period, including, without limitation, (i) amortization of
debt  discount,  (ii)  the  net  cost  of  interest  rate  contracts  (including
amortization of discounts),  (iii) the interest  portion of any deferred payment
obligation,  (iv)  amortization  of debt  issuance  costs  and (v) the  interest
component  of  Capital  Lease  Obligations  of the  Company  and its  Restricted
Subsidiaries,  plus (b) all  interest on any  Indebtedness  of any other  Person
guaranteed  and  paid  by the  Company  or any of its  Restricted  Subsidiaries;
provided,  however, that Consolidated Interest Expense will not include any gain
or loss from extinguishment of debt, including write-off of debt issuance costs.

                  "Consolidated  Non-Cash  Charges" means,  for any period,  the
aggregate depreciation,  amortization and other non-cash expenses of the Company
and its  Restricted  Subsidiaries  (including  without  limitation  any minority
interest) reducing Consolidated Adjusted Net Income for such period,  determined
on a  consolidated  basis in accordance  with GAAP  (excluding any such non-cash
charge that  requires  an accrual of or reserve for cash  charges for any future
period).

                                       4
<PAGE>

                  "Corporate Trust Office of the Trustee" will be at the address
of the Trustee  specified in Section  12.02  hereof or such other  address as to
which the Trustee may give notice to the Company.

                  "Credit Agent" means The Chase Manhattan Bank, in its capacity
as administrative  agent for the lenders party to the Credit  Agreement,  or any
successor or successors party thereto.

                  "Credit  Agreement"  means that  certain  Second  Amended  and
Restated Credit Agreement dated as of September 26, 1997, as amended,  among the
Company,  the lenders party thereto and the Credit  Agent,  as further  amended,
restated,  supplemented,   modified,  renewed,  refunded,  increased,  extended,
replaced or refinanced from time to time.

                  "Custodian" means any receiver, trustee, assignee,  liquidator
or similar official under any Bankruptcy Law.

                  "Default"  means any event that is or with the passage of time
or the giving of notice or both would be an Event of Default.

                  "Definitive  Note"  means a Note that  evidences a part of the
Notes and is  authenticated  and delivered to, and registered in the name of the
Holder thereof,  in the form of the Note attached hereto as Exhibit A, that does
not contain the paragraph referred to in footnotes 1, 2 and 3 and the additional
schedule referred to in footnote 4 thereof.

                  "Depositary" means, with respect to Notes issuable in whole or
in part in the form of the Global Note, a clearing agency  registered  under the
Exchange  Act  that  is  designated  to act as  Depositary  for  such  Notes  as
contemplated by Section 2.01.

                  "Designated  Senior  Debt"  means (a) Senior Bank Debt and (b)
other Senior Debt the principal  amount of which is $50.0 million or more at the
date of  designation  by the Company in a written  instrument  delivered  to the
Trustee; provided that Senior Debt designated as Designated Senior Debt pursuant
to clause  (b) shall  cease to be  Designated  Senior  Debt at any time that the
aggregate principal amount thereof outstanding is $10.0 million or less.

                  "Disqualified  Stock" means any Capital  Stock  which,  by its
terms (or by the terms of any security into which it is convertible or for which
it is  exchangeable),  or  upon  the  happening  of  any  event,  matures  or is
mandatorily  redeemable,  for cash or other  property  (other than Capital Stock
that is not  Disqualified  Stock)  pursuant  to a  sinking  fund  obligation  or
otherwise,  or is redeemable at the option of the Holder thereof, in whole or in
part, in each case on or prior to the stated maturity of the Notes.

                  "distribution"  means,  for  purposes of Articles 10 and 11, a
distribution  consisting of cash,  securities or other  property,  by set-off or
otherwise.

                  "Dollars"  and "$" mean lawful  money of the United  States of
America.

                                       5
<PAGE>

                  "DTC" means The Depository Trust Company.

                  "EBITDA" means for any period Consolidated Adjusted Net Income
for such period increased by (a) Consolidated  Interest Expense for such period,
plus (b) Consolidated  Income Tax Expense for such period, plus (c) Consolidated
Non-Cash Charges for such period.

                  "Equity  Interests"  means  Capital  Stock  and all  warrants,
options  or other  rights to  acquire  Capital  Stock  (but  excluding  any debt
security that is convertible into, or exchangeable for, Capital Stock).

                  "Equity  Proceeds" means (a) with respect to Equity  Interests
(or debt  securities  converted into Equity  Interests)  issued or sold for cash
Dollars,  the  aggregate  amount of such cash  Dollars  and (b) with  respect to
Equity Interests (or debt securities  converted into Equity Interests) issued or
sold for any consideration  other than cash Dollars,  the aggregate Market Price
thereof computed on the date of the issuance or sale thereof.

                  "Exchange Act" means the  Securities  Exchange Act of 1934, as
amended.

                  "Exchange  Offer"  means  the  offer  that  may be made by the
Company pursuant to the Registration Rights Agreement to exchange Series B Notes
for Series A Notes.

                  "Excluded   Restricted   Subsidiary"   means  any   Restricted
Subsidiary  organized  under the laws of a  jurisdiction  other  than the United
States (as defined in Regulation S under the  Securities  Act) and which has not
delivered a Subsidiary Guarantee.

                  "Existing  Indebtedness" means Indebtedness of the Company and
its  Subsidiaries  (other than under the Credit  Agreement)  in existence on the
date of this Indenture, until such amounts are repaid.

                  "GAAP" means  generally  accepted  accounting  principles  set
forth in the opinions and  pronouncements of the Accounting  Principles Board of
the American  Institute of  Certified  Public  Accountants  and  statements  and
pronouncements  of the  Financial  Accounting  Standards  Board or in such other
statements by such other entity as have been  approved by a significant  segment
of the accounting profession, which are in effect on the date of this Indenture.

                  "Global  Note" means a Note that  evidences all or part of the
Notes and is authenticated  and delivered to, and registered in the name of, the
Depositary for the Notes or a nominee thereof,  in the form of the Note attached
hereto as Exhibit A, that contains the  paragraph  referred to in footnotes 1, 2
and 3 and the additional schedule referred to in footnote 4 thereof.

                  "Government   Securities"  means  direct  obligations  of,  or
obligations guaranteed by, the United States of America for the payment of which
guarantee  or  obligations  the full faith and  credit of the  United  States of
America is pledged.

                                       6
<PAGE>

                  "Guarantee"  means,  as  applied  to  any  obligation,  (a)  a
guarantee (other than by endorsement of negotiable instruments for collection in
the ordinary course of business), direct or indirect, in any manner, of any part
or all of such obligation and (b) an agreement,  direct or indirect,  contingent
or otherwise,  the practical effect of which is to assure in any way the payment
or performance (or payment of damages in the event of non-performance) of all or
any part of such  obligation,  including,  without  limiting the foregoing,  the
obligation to reimburse amounts drawn down under letters of credit securing such
obligations.

                  "Hedging  Obligations"  means, with respect to any Person, the
obligations  of such Person under (a) interest  rate swap  agreements,  interest
rate cap agreements and interest rate collar agreements and (b) other agreements
or arrangements designed to protect such Person against fluctuations in interest
rates.

                  "Holder" means a Person in whose name a Note is registered.

                  "IAI" means an institutional  "accredited investor" as defined
in Rule 501(A)(1), (2), (3) or (7) of Regulation D under the Securities Act.

                  "Indebtedness"  means (without  duplication),  with respect to
any  Person,  whether  recourse  is to all or a  portion  of the  assets of such
Person,  and whether or not contingent,  (a) every obligation of such Person for
money  borrowed,  (b)  every  obligation  of such  Person  evidenced  by  bonds,
debentures,   notes  or  other  similar  instruments,  (c)  every  reimbursement
obligation  of  such  Person  with  respect  to  letters  of  credit,   bankers'
acceptances  or similar  facilities  issued for the account of such Person,  (d)
every obligation of such Person issued or assumed as the deferred purchase price
of property or services, (e) every Capital Lease Obligation and every obligation
of such  Person in  respect  of Sale and  Leaseback  Transactions  that would be
required to be capitalized on the balance sheet in accordance with GAAP, (f) all
Disqualified  Stock of such  Person  valued at the greater of its  voluntary  or
involuntary  maximum fixed repurchase  price,  plus accrued and unpaid dividends
(unless included in such maximum  repurchase price), (g) all obligations of such
Person under or with respect to Hedging  Obligations  which would be required to
be  reflected on the balance  sheet as a liability of such Person in  accordance
with  GAAP and (h) every  obligation  of the type  referred  to in  clauses  (a)
through (g) of another  Person and  dividends  of another  Person the payment of
which,  in either  case,  such  Person  has  guaranteed.  For  purposes  of this
definition,  the "maximum fixed repurchase price" of any Disqualified Stock that
does not have a fixed repurchase price will be calculated in accordance with the
terms of such Disqualified  Stock as if such Disqualified Stock were repurchased
on any date on which Indebtedness is required to be determined  pursuant to this
Indenture,  and if such price is based  upon,  or  measured  by, the fair market
value of such  Disqualified  Stock, such fair market value will be determined in
good faith by the board of directors of the issuer of such  Disqualified  Stock.
Notwithstanding  the foregoing,  trade accounts payable and accrued  liabilities
arising in the ordinary course of business and any liability for federal,  state
or  local  taxes or  other  taxes  owed by such  Person  will not be  considered
Indebtedness for purposes of this definition. The amount outstanding at any time
of any  Indebtedness  issued  with  original  issue  discount  is the  aggregate
principal  amount  at  maturity  of  

                                       7
<PAGE>

such Indebtedness,  less the remaining unamortized portion of the original issue
discount of such  Indebtedness  at such time, as  determined in accordance  with
GAAP.

                  "Indenture"  means this Indenture,  as amended or supplemented
from time to time.

                  "Initial  Purchasers"  means Bear,  Stearns & Co. Inc.,  Chase
Securities Inc., BNY Capital Markets,  Inc., Fleet Securities,  Inc., Prudential
Securities Incorporated and Scotia Capital Markers (USA) Inc.

                  "Investments"   means,   with  respect  to  any  Person,   all
investments by such Person in other Persons (including  Affiliates) in the forms
of loans (including  Guarantees),  advances or capital contributions  (excluding
commission,  travel and similar  advances to officers and employees  made in the
ordinary course of business),  purchases or other acquisitions for consideration
of  Indebtedness,  Equity Interests or other securities and all other items that
are or would be  classified  as  investments  on a  balance  sheet  prepared  in
accordance with GAAP.

                  "Issuance  Date"  means  the  closing  date  for the  sale and
original issuance of the Series A Notes.

                  "Legal  Holiday" means a Saturday,  a Sunday or a day on which
banking  institutions  in the  City of New  York or at a place  of  payment  are
authorized by law,  regulation or executive order to remain closed. If a payment
date is a Legal Holiday at a place of payment, payment may be made at that place
on the next  succeeding  day that is not a Legal  Holiday,  and no interest will
accrue for the intervening period.

                  "Leverage  Ratio"  means,  at any  date,  the ratio of (a) the
aggregate  principal  amount of  Indebtedness  of the Company and its Restricted
Subsidiaries  outstanding  as of the most recent  available  quarterly or annual
balance sheet to (b) Adjusted  EBITDA,  after giving pro forma  effect,  without
duplication, to (i) the incurrence,  repayment or retirement of any Indebtedness
by the  Company or its  Restricted  Subsidiaries  since the last day of the most
recent full fiscal  quarter of the Company,  (ii) if the Leverage Ratio is being
determined in connection with the incurrence of Indebtedness by the Company or a
Restricted  Subsidiary,   such  Indebtedness  to  be  incurred,  and  (iii)  the
Indebtedness   to  be  incurred  in  connection  with  the  acquisition  of  any
Acquisition EBITDA Entity.

                  "Lien" means,  with respect to any asset, any mortgage,  lien,
pledge, charge,  security interest or encumbrance of any kind in respect of such
asset,  whether or not filed,  recorded or otherwise  perfected under applicable
law (including any  conditional  sale or other title  retention  agreement,  any
lease in the nature  thereof,  any option or other  agreement  to sell or give a
security  interest  in and any  filing  of or  agreement  to give any  financing
statement  under the Uniform  Commercial  Code, or equivalent  statutes,  of any
jurisdiction).

                  "Liquidated   Damages"   has  the   meaning  set  out  in  the
Registration Rights Agreement.

                                       8
<PAGE>

                  "Make-Whole Amount" means, with respect to any Note, an amount
equal  to the  excess,  if  any,  of (a)  the  present  value  of the  remaining
principal,  premium and interest  payments that would be payable with respect to
such Note if such Note were redeemed on July 1, 2004,  computed using a discount
rate equal to the Treasury Rate plus 75 basis points,  over (b) the  outstanding
principal amount of such Note.

                  "Make-Whole  Average Life" means,  with respect to any date of
redemption of Notes, the number of years (calculated to the nearest one-twelfth)
from such redemption date to July 1, 2004.

                  "Make-Whole  Price"  means,  with  respect  to any  Note,  the
greater of (a) the sum of the  principal  amount of and  Make-Whole  Amount with
respect to such Note, and (b) the redemption price of such Note on July 1, 2004.

                  "Market Price" means,  (a) with respect to the  calculation of
Equity  Proceeds  from the issuance or sale of debt  securities  which have been
converted into Equity  Interests,  the value received upon the original issuance
or sale of such converted debt securities,  as determined reasonably and in good
faith by the Board of  Directors,  and (b) with  respect to the  calculation  of
Equity  Proceeds from the issuance or sale of Equity  Interests,  the average of
the daily  closing  prices  for such  Equity  Interests  for the 20  consecutive
trading days preceding the date of such computation.  The closing price for each
day  will be (a)  such  closing  price  on the  NYSE  Consolidated  Tape (or any
successor  consolidated  tape  reporting  transactions  on the  New  York  Stock
Exchange)  or,  if  such  composite  tape  is  not in use  or  does  not  report
transactions in such Equity Interests, or if such Equity Interests are listed on
a stock  exchange  other than the New York Stock  Exchange  (including  for this
purpose the Nasdaq  National  Market),  the last reported sale price regular way
for such day,  or in case no such  reported  sale takes  place on such day,  the
average of the  closing bid and asked  prices  regular way for such day, in each
case  on the  principal  national  securities  exchange  on  which  such  Equity
Interests  are  listed  or  admitted  to  trading  (which  will be the  national
securities  exchange on which the greatest number of such Equity  Interests have
been traded  during such 20  consecutive  trading  days),  or (b) if such Equity
Interests  are not  listed or  admitted  to trading  on any such  exchange,  the
average of the  closing  bid and asked  prices  thereof in the  over-the-counter
market as reported by the National  Association of Securities  Dealers Automated
Quotation  System or any  successor  system,  or if not  included  therein,  the
average of the closing bid and asked prices thereof  furnished by two members of
the National  Association of Securities Dealers selected  reasonably and in good
faith by the Board of Directors for that purpose.  In the absence of one or more
such  quotations,  the Market Price for such Equity Interests will be determined
reasonably and in good faith by the Board of Directors.

                  "Net Proceeds"  means the aggregate cash proceeds  received by
the Company or any of its Restricted  Subsidiaries in respect of any Asset Sale,
which  amount is equal to the excess,  if any,  of (a) the cash  received by the
Company or such Restricted  Subsidiary  (including any cash payments received by
way of deferred  payment  pursuant to, or monetization of, a note or installment
receivable or otherwise,  but only as and when received) in connection with such
disposition  over (b) the sum of (i) the  amount  of any  Indebtedness  which is
secured by such asset 

                                        9
<PAGE>

and which is required to be repaid in connection with the  disposition  thereof,
plus (ii) the reasonable  out-of-pocket expenses incurred by the Company or such
Restricted  Subsidiary,  as the case may be, in connection with such disposition
or in  connection  with  the  transfer  of  such  amount  from  such  Restricted
Subsidiary to the Company,  plus (iii)  provisions for taxes,  including  income
taxes, attributable to the disposition of such asset or attributable to required
prepayments or repayments of Indebtedness with the proceeds  thereof,  plus (iv)
if the  Company  does not  first  receive a  transfer  of such  amount  from the
relevant  Restricted  Subsidiary  with respect to the disposition of an asset by
such Restricted  Subsidiary and such Restricted  Subsidiary intends to make such
transfer as soon as practicable,  the out-of-pocket  expenses and taxes that the
Company reasonably  estimates will be incurred by the Company or such Restricted
Subsidiary  in  connection  with  such  transfer  at the time such  transfer  is
expected  to  be  received  by  the  Company  (including,   without  limitation,
withholding taxes on the remittance of such amount).

                  "1996  Indenture"  means the Indenture  dated as of October 1,
1996  among  the  Company,  the  Restricted   Subsidiaries  parties  thereto  as
guarantors and First Bank National  Association,  as trustee,  pursuant to which
the 1996 Notes were issued.

                  "1996 Notes" means the 10 1/8%  Senior Subordinated  Notes due
2006 issued under the 1996 Indenture.

                  "1997  Indenture"  means the Indenture dated as of October 24,
1997  among  the  Company,  the  Restricted   Subsidiaries  parties  thereto  as
guarantors  and The Bank of New York,  as  trustee,  pursuant  to which the 1997
Notes were issued.

                  "1997  Notes" means the 8 3/4% Senior  Subordinated  Notes due
2009 issued under the 1997 Indenture.

                  "Notes" means, collectively, the Series A Notes and the Series
B Notes.

                  "Obligations"   means  any  principal,   interest   (including
post-petition  interest,  whether or not allowed as a claim in any  proceeding),
penalties, fees, costs, expenses, indemnifications,  reimbursements, damages and
other liabilities payable under or in connection with any Indebtedness.

                  "Officer" means,  with respect to any Person,  the Chairman of
the Board,  the Chief  Executive  Officer,  the President,  the Chief  Operating
Officer,  the Chief Financial Officer,  the Treasurer,  any Assistant Treasurer,
the Controller, the Secretary or any Vice-President of such Person.

                  "Officers'  Certificate"  means a certificate  signed,  unless
otherwise specified, by any two of the Chairman of the Board, a Vice Chairman of
the Board,  the President,  the Chief  Financial  Officer,  the Controller or an
Executive  Vice  President of the Company,  and  delivered to the Trustee,  that
meets the requirements of Section 12.05 hereof.

                                       10
<PAGE>

                  "Opinion of Counsel"  means an opinion from legal  counsel who
is reasonably  acceptable to the Trustee, that meets the requirements of Section
12.05 hereof.  The counsel may be an employee of or counsel to the Company,  any
Subsidiary of the Company or the Trustee.

                  "Permitted  Investments"  means  (a)  any  Investments  in the
Company  or in a  Restricted  Subsidiary  (other  than  an  Excluded  Restricted
Subsidiary)  of the  Company,  including  without  limitation  the  Guarantee of
Indebtedness  permitted  under Section 4.09 hereof;  (b) any Investments in Cash
Equivalents;  (c) Investments by the Company or any Restricted Subsidiary of the
Company in a Person, if as a result of such Investment (i) such Person becomes a
Restricted  Subsidiary  (other than an Excluded  Restricted  Subsidiary)  of the
Company or (ii) such Person is merged, consolidated or amalgamated with or into,
or transfers  or conveys  substantially  all of its assets to, or is  liquidated
into, the Company or a Restricted  Subsidiary (other than an Excluded Restricted
Subsidiary) of the Company;  (d) Investments in assets  (including  accounts and
notes  receivable)  owned  or used  in the  ordinary  course  of  business;  (e)
Investments for any purpose related to the Company's records management business
(including,   without  limitation,   the  Company's   outsourcing  and  staffing
businesses)  in an aggregate  outstanding  principal  amount not to exceed $10.0
million;  and (f) Investments by the Company or a Restricted  Subsidiary  (other
than an  Excluded  Restricted  Subsidiary)  in one or more  Excluded  Restricted
Subsidiaries,  the aggregate  outstanding amount of which does not exceed 10% of
the consolidated assets of the Company and its Restricted Subsidiaries.

                  "Permitted Liens" means:

                           (a) Liens existing as of the Issuance Date;

                           (b) Liens on property or assets of the Company or any
                  Restricted Subsidiary securing Senior Debt;

                           (c) Liens on any  property or assets of a  Restricted
                  Subsidiary granted in favor of the Company or any Wholly Owned
                  Restricted Subsidiary;

                           (d)  Liens  securing  the  Notes  or  the  Subsidiary
                  Guarantees;

                           (e) any  interest  or  title of a  lessor  under  any
                  Capital Lease Obligation or Sale and Leaseback  Transaction so
                  long as the  Indebtedness,  if any,  secured by such Lien does
                  not  exceed the  principal  amount of  Indebtedness  permitted
                  under Section 4.09 hereof;

                                       11
<PAGE>

                           (f) Liens  securing  Acquired  Debt created  prior to
                  (and  not in  connection  with  or in  contemplation  of)  the
                  incurrence  of  such   Indebtedness  by  the  Company  or  any
                  Restricted Subsidiary; provided that such Lien does not extend
                  to any  property  or assets of the  Company or any  Restricted
                  Subsidiary  other than the assets  acquired in connection with
                  the incurrence of such Acquired Debt;

                           (g) Liens securing Hedging  Obligations  permitted to
                  be incurred pursuant to clause (g) of Section 4.09 hereof;

                           (h) Liens arising from purchase  money  mortgages and
                  purchase  money  security  interests,  or in  respect  of  the
                  construction  of property or assets,  incurred in the ordinary
                  course  of  the  business  of  the  Company  or  a  Restricted
                  Subsidiary;  provided that (i) the related Indebtedness is not
                  secured  by any  property  or  assets  of the  Company  or any
                  Restricted  Subsidiary  other than the  property and assets so
                  acquired  or  constructed  and  (ii) the  Lien  securing  such
                  Indebtedness is created within 60 days of such  acquisition or
                  construction;

                           (i)  statutory  Liens or  landlords'  and  carriers',
                  warehousemen's,    mechanics',   suppliers',    materialmen's,
                  repairmen's or other like Liens arising in the ordinary course
                  of business and with respect to amounts not yet  delinquent or
                  being contested in good faith by appropriate proceedings, if a
                  reserve or other  appropriate  provision,  if any,  as is then
                  required in conformity with GAAP has been made therefor;

                           (j) Liens for taxes, assessments,  government charges
                  or claims with respect to amounts not yet  delinquent  or that
                  are being  contested in good faith by appropriate  proceedings
                  diligently  conducted,  if  a  reserve  or  other  appropriate
                  provision,  if any, as is required in conformity with GAAP has
                  been made therefor;

                           (k) Liens  incurred  or  deposits  made to secure the
                  performance of tenders,  bids, leases,  statutory obligations,
                  surety and appeal  bonds,  government  contracts,  performance
                  bonds and other  obligations of a like nature  incurred in the
                  ordinary  course of  business  (other than  contracts  for the
                  payment of money);

                           (l) easements, rights-of-way,  restrictions and other
                  similar  charges  or  encumbrances   not  interfering  in  any
                  material  respect  with the  business  of the  Company  or any
                  Restricted  Subsidiary  incurred  in the  ordinary  course  of
                  business;

                           (m) Liens arising by reason of any  judgment,  decree
                  or  order  of any  court  so long as such  Lien is  adequately
                  bonded and any  appropriate  legal  proceedings  that may have
                  been duly initiated for the review of such judgment, decree or
                  order  shall not have been  finally  terminated  or the period
                  within which such  proceedings may be initiated shall not have
                  expired;

                           (n) Liens arising under options or agreements to sell
                  assets;

                           (o) other Liens securing  obligations incurred in the
                  ordinary course of business,  which  obligations do not exceed
                  $10.0  million in the  aggregate at any one time  outstanding;
                  and

                                       12
<PAGE>

                           (p) any extension,  renewal or replacement,  in whole
                  or in part, of any Lien described in the foregoing clauses (a)
                  through  (o);  provided  that any such  extension,  renewal or
                  replacement  does not  extend to any  additional  property  or
                  assets.

                  "Person" means any individual,  corporation, limited liability
company, partnership,  joint venture,  association,  joint-stock company, trust,
unincorporated  organization,  or any  government  or any  agency  or  political
subdivision thereof.

                  "Principal  Stockholders"  means  each  of  Vincent  J.  Ryan,
Schooner  Capital LLC, C. Richard  Reese,  Kent P. Dauten,  B. Thomas  Golisano,
Eugene B. Doggett and their respective Affiliates.

                  "QIB" means "qualified institutional buyer" as defined in Rule
144A.

                  "Qualified  Equity  Offering"  means an  offering  of  Capital
Stock,  other than  Disqualified  Stock,  of the  Company for  Dollars,  whether
registered or exempt from registration under the Securities Act.

                  "Qualified  Issuer"  means (a) any lender  party to the Credit
Agreement or (b) any commercial bank (i) which has capital and surplus in excess
of $500,000,000 and (ii) the outstanding short-term debt securities of which are
rated at least A-2 by Standard & Poor's Rating Group, a division of McGraw-Hill,
Inc. or at least P-2 by Moody's Investors Service, or carry an equivalent rating
by a  nationally  recognized  rating  agency  if both of the  two  named  rating
agencies cease publishing ratings of investments.

                  "Qualifying Sale and Leaseback Transaction" means any Sale and
Leaseback Transaction between the Company or any of its Restricted  Subsidiaries
and any bank,  insurance  company or other lender or investor  providing for the
leasing to the Company or such  Restricted  Subsidiary of any property  (real or
personal)  which has been or is to be sold or transferred by the Company or such
Restricted  Subsidiary to such lender or investor or to any Person to whom funds
have  been or are to be  advanced  by such  lender  or  investor  and  where the
property in question  has been  constructed  or acquired  after the date of this
Indenture.

                  "Refinancing  Indebtedness" means new Indebtedness incurred or
given in  exchange  for,  or the  proceeds  of which are used to repay,  redeem,
defease,  extend,  refinance,  renew,  replace  or refund,  other  Indebtedness;
provided,  however, that (a) the principal amount of such new Indebtedness shall
not exceed the principal amount of Indebtedness so repaid,  redeemed,  defeased,
extended,  refinanced,  renewed,  replaced or refunded (plus the amount of fees,
premiums, consent fees, prepayment penalties and expenses incurred in connection
therewith); (b) such Refinancing Indebtedness shall have a Weighted Average Life
to Maturity  equal to or greater than the  Weighted  Average Life to Maturity of
the Indebtedness so repaid, redeemed, defeased, extended,  refinanced,  renewed,
replaced or refunded or shall mature after the maturity  date of the Notes;  (c)
to the extent such Refinancing  Indebtedness  refinances Indebtedness that has a
final  maturity date  occurring  after the maturity date of the Notes,  such new
Indebtedness  shall have a final  scheduled  

                                       13
<PAGE>

maturity not earlier than the final  scheduled  maturity of the  Indebtedness so
repaid, redeemed, defeased, extended, refinanced,  renewed, replaced or refunded
and shall not permit  redemption  at the option of the holder  earlier  than the
earliest date of redemption at the option of the holder of the  Indebtedness  so
repaid, redeemed, defeased, extended, refinanced, renewed, replaced or refunded;
(d)  to  the  extent  such  Refinancing   Indebtedness  refinances  Indebtedness
subordinate to the Notes, such Refinancing Indebtedness shall be subordinated in
right of payment to the Notes and to the extent  such  Refinancing  Indebtedness
refinances  Notes or Indebtedness  pari passu with the Notes,  such  Refinancing
Indebtedness shall be pari passu with or subordinated in right of payment to the
Notes,  in each case on terms at least as  favorable  to the holders of Notes as
those  contained in the  documentation  governing  the  Indebtedness  so repaid,
redeemed, defeased, extended, refinanced, renewed, replaced or refunded; and (e)
with respect to Refinancing  Indebtedness  incurred by a Restricted  Subsidiary,
such Refinancing  Indebtedness  shall rank no more senior, and shall be at least
as  subordinated,  in right  of  payment  to the  Subsidiary  Guarantee  of such
Restricted  Subsidiary as the  Indebtedness  being repaid,  redeemed,  defeased,
extended, refinanced, renewed, replaced or refunded.

                  "Registration  Rights Agreement" means the Registration Rights
Agreement,  dated  as of the  Issuance  Date,  by and  among  the  Company,  the
Guarantors and the Initial  Purchasers,  as amended or supplemented from time to
time.

                  "Regulation S" means Regulation S under the Securities Act.

                  "Representative"  means,  for  purposes of Articles 10 and 11,
the Credit Agent or other agent,  trustee or representative  for any Senior Debt
of the Company or, with  respect to any  Restricted  Subsidiary,  for any Senior
Debt of such Restricted Subsidiary.

                  "Responsible  Officer"  when used with respect to the Trustee,
means any officer within the corporate  trust  department of the Trustee (or any
successor group of the Trustee) or any other officer of the Trustee  customarily
performing  functions  similar to those performed by any of the above designated
officers and also means,  with respect to a particular  corporate  trust matter,
any other  officer to whom such matter is referred  because of his  knowledge of
and familiarity with the particular subject.

                  "Restricted  Securities" means Notes that bear or are required
to bear the legends set forth in Exhibit A hereto.

                  "Restricted  Subsidiary"  means (a) each  direct  or  indirect
Subsidiary  of the  Company,  other  than Iron  Mountain  Global,  Inc.  and its
Subsidiaries (including Britannia Data Management Limited and its Subsidiaries),
existing  on the date of this  Indenture  and (b) any other  direct or  indirect
Subsidiary of the Company  formed,  acquired or existing  after the date of this
Indenture (including any Excluded Restricted Subsidiaries), which in the case of
(a) or (b), is not  designated  by the Board of  Directors  as an  "Unrestricted
Subsidiary."

                                       14
<PAGE>

                  "Rule 144A" means Rule 144A under the Securities  Act, as such
Rule  may be  amended  from  time to time,  or any  similar  rule or  regulation
hereafter adopted by the SEC.

                  "Sale and  Leaseback  Transaction"  means any  transaction  or
series of related transactions pursuant to which a Person sells or transfers any
property  or asset  in  connection  with  the  leasing,  or the  resale  against
installment payments, of such property or asset to the seller or transferor.

                  "SEC" means the Securities and Exchange Commission.

                  "Securities Act" means the Securities Act of 1933, as amended.

                  "Senior Bank Debt" means all Obligations  outstanding under or
in  connection  with  the  Credit  Agreement   (including   Guarantees  of  such
Obligations by Subsidiaries of the Company).

                  "Senior Debt" means (a) the Senior Bank Debt and (b) any other
Indebtedness  permitted  to  be  incurred  by  the  Company  or  any  Restricted
Subsidiary,  as the case may be, under the terms of this  Indenture,  unless the
instrument under which such Indebtedness is incurred  expressly provides that it
is on a  parity  with or  subordinated  in  right  of  payment  to the  Notes or
subordinated  to  Senior  Debt on terms  substantially  similar  to those of the
Notes.  Notwithstanding  anything to the contrary in the foregoing,  Senior Debt
shall not include (i) any  liability  for federal,  state,  local or other taxes
owed or owing by the Company, (ii) any Indebtedness of the Company to any of its
Subsidiaries  or  other  Affiliates,  (iii)  any  trade  payables  or  (iv)  any
Indebtedness that is incurred in violation of this Indenture  provided that such
Indebtedness  shall be deemed  not to have been  incurred  in  violation  of the
Indenture  for  purposes of this clause (iv) if, in the case of any  obligations
under the Credit  Agreement,  the holders of such  obligations or their agent or
representative  shall have  received a  representation  from the  Company to the
effect that the incurrence of such  Indebtedness does not violate the provisions
of this Indenture.

                  "Series A Notes"  means the  Company's  8 1/4% Series A Senior
Subordinated  Notes due  2011,  as  amended  or  supplemented  from time to time
pursuant to the terms hereof, that are issued under this Indenture.

                  "Series B Notes"  means the  Company's  8 1/4% Series B Senior
Subordinated  Notes due  2011,  as  amended  or  supplemented  from time to time
pursuant to the terms hereof, that are issued under this Indenture.

                  "Significant  Subsidiary" means any Subsidiary that would be a
"significant  subsidiary" as defined in Article 1, Rule 1-02 of Regulation  S-X,
promulgated  pursuant to the Securities  Act, as such Regulation is in effect on
the date hereof.

                  "Subsidiary"   means,   with   respect  to  any  Person,   any
corporation,  association or other business entity of which more than 50% of the
total voting power of shares of Capital 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
such  Person  or one or more of the  other  Subsidiaries  of  such  Person  or a
combination thereof.

                                       15
<PAGE>

                  "Subsidiary  Guarantee"  means  a  Guarantee  of  a  Guarantor
pursuant to Article 11 hereof.

                  "TIA" means the Trust  Indenture  Act of 1939,  as amended (15
U.S.C. ss.ss.  77aaa-77bbbb) as in effect on the date on which this Indenture is
qualified under the TIA, except as provided in Section 9.03.

                  "Treasury Rate" means,  at any time of computation,  the yield
to  maturity  at such time (as  compiled  by and  published  in the most  recent
Federal  Reserve  Statistical  Release  H.15(519),  which  has  become  publicly
available at least two business days prior to the date of the redemption  notice
or if such Statistical  Release is no longer published,  any publicly  available
source of similar  market  data) of United  States  Treasury  securities  with a
constant  maturity most nearly equal to the Make-Whole  Average Life;  provided,
however,  that if the  Make-Whole  Average  Life is not  equal  to the  constant
maturity of the United States Treasury security for which a weekly average yield
is  given,  the  Treasury  Rate  shall  be  obtained  by  linear   interpolation
(calculated to the nearest one-twelfth of a year) from the weekly average yields
of United States  Treasury  securities  for which such yields are given,  except
that if the  Make-Whole  Average Life is less than one year,  the weekly average
yield on  actually  traded  United  States  Treasury  securities  adjusted  to a
constant maturity of one year shall be used.

                  "Trustee"  means  the  party  named  as  such  above  until  a
successor  replaces it in  accordance  with the  applicable  provisions  of this
Indenture and thereafter means the successor serving hereunder.

                  "Unrestricted  Subsidiary"  means (a) any  Subsidiary  that is
designated by the Board of Directors as an Unrestricted Subsidiary in accordance
with Section 4.17 hereof and (b) any Subsidiary of an Unrestricted Subsidiary.

                  "U.S. person" means U.S. person as defined in Regulation S.

                  "Voting  Stock"  means any class or classes  of Capital  Stock
pursuant  to which the  holders  thereof  have the  general  voting  power under
ordinary  circumstances  to elect at least a majority of the board of directors,
managers or trustees of any Person (irrespective of whether or not, at the time,
stock of any other class or classes  has, or might have,  voting power by reason
of the happening of any contingency).

                  "Weighted Average Life to Maturity" means, when applied to any
Indebtedness  at any date,  the number of years obtained by dividing (a) the sum
of the products  obtained by  multiplying  (x) the amount of each then remaining
installment,  sinking  fund,  serial  maturity  or  other  required  payment  of
principal,  including payment at final maturity,  in respect thereof, by (y) the
number of years (calculated to the nearest one-twelfth) that will elapse between
such date and the making of such payment, by (b) the then outstanding  principal
amount of such Indebtedness.

                  "Wholly  Owned  Restricted  Subsidiary"  means any  Restricted
Subsidiary  of the  Company  all of  the  outstanding  Capital  Stock  or  other
ownership interests of which (other than 

                                       16
<PAGE>

director's  qualifying shares) shall at
the time be owned  by the  Company  or by one of more  Wholly  Owned  Restricted
Subsidiaries of the Company.

SECTION 1.02.       OTHER DEFINITIONS.

                                                                      Defined in
                               Term                                     Section
                    "Affiliate Transaction"................................4.11
                    "Asset Sale"...........................................4.10
                    "Asset Sale Offer".....................................4.10
                    "Benefited Party".....................................11.01
                    "Change of Control Offer"..............................4.14
                    "Change of Control Payment"............................4.14
                    "Change of Control Payment Date".......................4.14
                    "Covenant Defeasance"..................................8.03
                    "Commencement Date"....................................4.10
                    "Company Order"........................................2.02
                    "Event of Default".....................................6.01
                    "Excess Proceeds"......................................4.10
                    "Guarantor"...........................................11.01
                    "incur"................................................4.09
                    "Legal Defeasance" ....................................8.02
                    "Non-Monetary Default"................................10.03
                    "Offer Amount".........................................3.09
                    "Offer Period".........................................3.09
                    "Paying Agent".........................................2.03
                    "Payment Blockage Notice".............................10.03
                    "Payment Default".....................................10.03
                    "Purchase Date"........................................3.09
                    "Registrar"............................................2.03
                    "Restricted Payments"..................................4.07
                    "Separation Date"......................................2.06

SECTION 1.03.       INCORPORATION BY REFERENCE OF TRUST INDENTURE ACT.

                  Whenever this Indenture  refers to a provision of the TIA, the
provision is  incorporated  by  reference in and made a part of this  Indenture,
other  than  those  provisions  of the TIA that may be  excluded  herein,  which
provision  shall  be  excluded  to the  extent  specifically  excluded  in  this
Indenture.

                  The  following  TIA  terms  used in this  Indenture  have  the
following meanings:

                  "indenture  securities"  means the  Notes  and the  Subsidiary
Guarantees, if any;

                  "indenture security holder" means a Holder of a Note;

                                       17
<PAGE>

                  "indenture to be qualified" means this Indenture;

                  "indenture  trustee"  or  "institutional  trustee"  means  the
Trustee;

                  "obligor" on the Notes means the Company,  the  Guarantors and
any successor  obligor upon the Notes or any Subsidiary  Guarantee,  as the case
may be.

                  All other terms used in this Indenture that are defined by the
TIA,  defined  by TIA  reference  to  another  statute  or  defined by a rule or
regulation promulgated by the SEC under the TIA have the meanings so assigned to
them.

SECTION 1.04.       RULES OF CONSTRUCTION.

                  Unless the context otherwise requires:

                  (1) a term has the meaning assigned to it;

                  (2) an accounting  term not otherwise  defined has the meaning
         assigned to it in accordance with GAAP;

                  (3) "or" is not exclusive;

                  (4)  words in the  singular  include  the  plural,  and in the
         plural include the singular;

                  (5) provisions  apply to successive  events and  transactions;
         and

                  (6)  references  to sections of or rules under the  Securities
         Act  or the  Exchange  Act  shall  be  deemed  to  include  substitute,
         replacement or successor sections or rules adopted by the SEC from time
         to time.


                                   ARTICLE 2.
                                    THE NOTES

SECTION 2.01.       FORM AND DATING.

                  The  Notes and the  Trustee's  certificate  of  authentication
shall be substantially  in the form of Exhibit A hereto,  the terms of which are
incorporated  in and made a part of this  Indenture.  The  notation on each Note
relating to the Subsidiary  Guarantees  shall be  substantially  in the form set
forth  on  Exhibit  C,  which  is part of this  Indenture.  The  Notes  may have
notations,  legends  or  endorsements  approved  as to form by the  Company  and
required by law, stock  exchange  rule,  agreements to which the Company or each
Restricted Subsidiary is subject, or usage. Each Note shall be dated the date of
its authentication.  The Notes shall be issuable only in denominations of $1,000
and integral multiples thereof.

                                       18
<PAGE>

                  The Notes shall, in accordance with the following  provisions,
be issuable  (i) in whole or in part in the form of the Global Note and, in such
case,  the Depositary for such Global Note shall be designated by the Company in
an  Officers'  Certificate  delivered to the Trustee on or prior to the Issuance
Date and (ii) in definitive  form in the form of one or more  Definitive  Notes.
The Global Note shall represent the aggregate amount of outstanding Notes of all
Holders other than, in the case of Notes that are Restricted Securities, Holders
that are IAIs, from time to time endorsed thereon;  provided, that the aggregate
amount of outstanding Notes represented thereby may from time to time be reduced
or increased, as appropriate,  to reflect exchanges and redemptions. In the case
of Notes that are Restricted Securities, Definitive Notes shall be issued to all
Holders that are IAIs in the aggregate amount of outstanding  Notes held by such
Holders.  Any  endorsement  of the  Global  Note to  reflect  the  amount of any
increase or  decrease in the amount of  outstanding  Notes  represented  thereby
shall be made by the  Trustee,  in  accordance  with  instructions  given by the
Holder   thereof  as  required  by  Section  2.06  hereof.   Every  Global  Note
authenticated  and delivered  hereunder will bear a legend  substantially in the
form thereof set forth on Exhibit A hereto.

SECTION 2.02.       EXECUTION AND AUTHENTICATION.

                  Two  Officers  of the  Company  shall  sign the  Notes for the
Company by manual or facsimile signature. The Company's seal shall be reproduced
on the Notes and may be in facsimile  form. An Officer of each  Guarantor  shall
sign the  Subsidiary  Guarantee  for  such  Guarantor  by  manual  or  facsimile
signature.

                  If an Officer of the Company or a Guarantor whose signature is
on a Note or a  Subsidiary  Guarantee,  as the case may be, no longer holds that
office  at the  time  the  Note is  authenticated,  the  Note or the  Subsidiary
Guarantee, as the case may be, shall nevertheless be valid.

                  A Note shall not be valid  until  authenticated  by the manual
signature  of the Trustee.  The  signature  of the Trustee  shall be  conclusive
evidence that the Note has been authenticated under this Indenture.  The form of
Trustee's  certificate  of  authentication  to be  borne by the  Notes  shall be
substantially as set forth in Exhibit A hereto.

                  The Trustee shall,  upon a written order of the Company signed
by two  Officers  of the  Company (a "Company  Order"),  authenticate  Notes for
original issue up to an aggregate  principal amount stated in paragraph 4 of the
Notes. The aggregate principal amount of Notes outstanding at any time shall not
exceed $150,000,000 except as provided in Section 2.07 hereof.

                  The Trustee may appoint an authenticating  agent acceptable to
the  Company  to  authenticate  Notes.  Unless  limited  by the  terms  of  such
appointment, an authenticating agent may authenticate Notes whenever the Trustee
may do so. Each  reference in this  Indenture to  authentication  by the Trustee
includes  authentication  by such agent.  An  authenticating  agent has the same
rights as an Agent to deal with the Company or any  Guarantor or an Affiliate of
the Company or any Guarantor.

                                       19
<PAGE>

SECTION 2.03.       REGISTRAR, PAYING AGENT AND DEPOSITARY.

                  The Company shall maintain (i) an office or agency where Notes
may be presented for  registration  of transfer or for exchange  (including  any
co-registrar,  the  "Registrar") and (ii) an office or agency where Notes may be
presented for payment ("Paying  Agent").  The Registrar shall keep a register of
the Notes and of their  transfer  and  exchange.  The Company may appoint one or
more  co-registrars and one or more additional  paying agents.  The term "Paying
Agent" includes any additional  paying agent.  The Company may change any Paying
Agent,  Registrar or co-registrar  without prior notice to any Holder of a Note.
The Company shall notify the Trustee and the Trustee shall notify the Holders of
the Notes of the name and  address  of any Agent not a party to this  Indenture.
The Company or any Guarantor may act as Paying Agent, Registrar or co-registrar.
The Company shall enter into an appropriate  agency agreement with any Agent not
a party to this Indenture,  which shall be subject to any obligations imposed by
the provisions of the TIA. The agreement  shall implement the provisions of this
Indenture that relate to such Agent. The Company shall notify the Trustee of the
name and address of any such Agent. If the Company fails to maintain a Registrar
or Paying Agent, or fails to give the foregoing notice, the Trustee shall act as
such,  and shall be entitled to  appropriate  compensation  in  accordance  with
Section 7.07 hereof.

                  The  Company  initially  appoints  the  Trustee as  Registrar,
Paying Agent and agent for service of notices and demands in connection with the
Notes.

                  The Company  initially  appoints DTC to act as Depositary with
respect  to the  Global  Note.  The  Trustee  shall  act as  custodian  for  the
Depositary with respect to the Global Note.

SECTION 2.04.       PAYING AGENT TO HOLD MONEY IN TRUST.

                  The Company  shall  require  each Paying  Agent other than the
Trustee to agree in writing  that the Paying  Agent  shall hold in trust for the
benefit of the  Holders of the Notes or the Trustee all money held by the Paying
Agent for the payment of  principal  of,  premium,  if any,  and interest on the
Notes,  and shall  promptly  notify the Trustee of any Default by the Company or
the Guarantors in making any such payment. While any such Default continues, the
Trustee may require a Paying  Agent to pay all money held by it to the  Trustee.
The Company at any time may  require a Paying  Agent to pay all money held by it
to the Trustee.  Upon  payment  over to the Trustee,  the Paying Agent (if other
than the Company or a Guarantor)  shall have no further  liability for the money
delivered to the Trustee. If the Company or a Guarantor acts as Paying Agent, it
shall segregate and hold in a separate trust fund for the benefit of the Holders
of the Notes,  subject  to  Article  10  hereof,  all money held by it as Paying
Agent. Upon any bankruptcy or reorganization  proceeding relating to the Company
or a Guarantor, the Trustee shall serve as Paying Agent for the Notes.

SECTION 2.05.       LISTS OF HOLDERS OF THE NOTES.

                  The  Trustee  shall  preserve  in  as  current  a  form  as is
reasonably  practicable  the most recent list  available  to it of the names and
addresses  of  Holders  of the  Notes and shall  

                                       20
<PAGE>

otherwise comply with TIA ss. 312(a).  If the Trustee is not the Registrar,  the
Company  and/or  the  Guarantors  shall  furnish to the  Trustee at least  seven
Business Days before each  interest  payment date and at such other times as the
Trustee  may  request  in writing a list in such form and as of such date as the
Trustee  may  reasonably  require of the names and  addresses  of Holders of the
Notes,  including  the  aggregate  principal  amount of the  Notes  held by each
thereof,  and the Company and each Guarantor shall otherwise comply with TIA ss.
312(a).

SECTION 2.06.       TRANSFER AND EXCHANGE.

                  (a) Transfer and Exchange of Definitive Notes. When Definitive
Notes are presented by a Holder to the Registrar  with a request (1) to register
the transfer of the Definitive  Notes or (2) to exchange such  Definitive  Notes
for  an  equal  principal   amount  of  Definitive  Notes  of  other  authorized
denominations, the Registrar shall register the transfer or make the exchange as
requested if its requirements for such  transactions are met;  provided that any
Definitive  Notes  presented  or  surrendered  for  registration  of transfer or
exchange (A) shall be duly endorsed or accompanied  by a written  instruction of
transfer  in form  satisfactory  to the  Registrar  duly  executed by the Holder
thereof or by his attorney  duly  authorized  in writing;  (B) unless the Global
Note has previously been exchanged in whole for Definitive Notes,  shall only be
exchanged for an interest in the Global Note in accordance  with Section 2.06(b)
if such  Definitive  Notes are being  transferred  (i)  pursuant to an effective
registration  statement  under the Securities  Act; (ii) to a QIB in reliance on
Rule 144A; or (iii)  outside the United States to a non-U.S.  person in reliance
on  Regulation  S; and (C) in the case of a  Restricted  Security,  such request
shall  be  accompanied  by the  following  additional  documents:  (i)  if  such
Restricted  Security  is  being  delivered  to the  Registrar  by a  Holder  for
registration in the name of such Holder,  without  transfer,  a certification to
that  effect (in  substantially  the form of Exhibit D  attached  hereto)  and a
letter containing certain  representations  and agreements (in substantially the
form of Exhibit E attached hereto); or (ii) if such Restricted Security is being
transferred  to an  IAI  in  reliance  on an  exemption  from  the  registration
requirements of the Securities Act, other than to a QIB in reliance on Rule 144A
or outside the United States to a non-U.S. person in reliance on Regulation S, a
certification  to that effect (in  substantially  the form of Exhibit D attached
hereto),  and a letter  containing  certain  representations  and agreements (in
substantially  the form of Exhibit E attached  hereto)  and, if requested by the
Company or the  Trustee,  an opinion of  counsel  reasonably  acceptable  to the
Company and the Trustee to the effect that such transfer is in  compliance  with
the Securities Act.

                  (b) Transfer of a Definitive Note for a Beneficial Interest in
the Global Note. A Definitive Note may be exchanged for a beneficial interest in
the Global Note only upon  receipt by the  Trustee of a  Definitive  Note,  duly
endorsed  or  accompanied  by  appropriate  instruments  of  transfer,  in  form
satisfactory to the Trustee,  together with: (i) written instructions  directing
the Trustee to make an  endorsement on the Global Note to reflect an increase in
the aggregate  principal amount of the Notes represented by the Global Note, and
(ii) if such  Definitive  Note is a Restricted  Security,  a  certification  (in
substantially  the form of  Exhibit D attached  hereto) to the effect  that such
Definitive Note is either being transferred to a QIB in reliance on Rule 144A or
outside the United  States to a non-U.S.  person in reliance on Regulation S; in
which case the Trustee shall cancel such Definitive Note and cause the 

                                       21
<PAGE>

aggregate  principal  amount  of  Notes  represented  by the  Global  Note to be
increased accordingly. If no Global Note is then outstanding,  the Company shall
issue and the Trustee shall  authenticate  a new Global Note in the  appropriate
principal amount.

                  (c) Transfer of a  Beneficial  Interest in a Global Note for a
Definitive Note. A beneficial interest in the Global Note may be exchanged for a
Definitive Note only in the case of a Restricted  Security,  and upon receipt by
the Trustee of written transfer instructions (or such other form of instructions
as is customary  for the  Depositary)  from the  Depositary  (or its nominee) on
behalf of any Person  having a  beneficial  interest  in a Global Note that such
Restricted  Security is being  transferred to an IAI in reliance on an exemption
from the registration requirements of the Securities Act, other than to a QIB in
reliance  on Rule 144A or  outside  the United  States to a  non-U.S.  person in
reliance on Regulation S, provided however that such request is accompanied by a
certification  to that effect (in  substantially  the form of Exhibit D attached
hereto) and a letter  containing  certain  representations  and  agreements  (in
substantially  the form of Exhibit E attached  hereto)  and, if requested by the
Company or the  Trustee,  an opinion of  counsel  reasonably  acceptable  to the
Company and the Trustee to the effect that such transfer is in  compliance  with
the  Securities  Act, in which case the Trustee  shall,  in accordance  with the
standing  instructions  and procedures  existing  between the Depositary and the
Trustee,  cause the aggregate  principal amount of the Global Note to be reduced
accordingly  and,  following such  reduction,  the Company shall execute and the
Trustee shall  authenticate  and make available for delivery to the transferee a
Definitive Note in the appropriate principal amount.

                  Definitive Notes issued in exchange for a beneficial  interest
in a Global  Note  shall be  registered  in such  names  and in such  authorized
denominations as the Depositary shall instruct the Trustee.

                  (d)  Transfer  and  Exchange of  beneficial  interests  in the
Global Note.  The transfer  and exchange of  beneficial  interests in the Global
Note shall be effected  through the Depositary in accordance with this Indenture
and the procedures of the Depositary therefor,  which shall include restrictions
on transfer  comparable to those set forth herein to the extent  required by the
Securities Act.

                  When a  Global  Note  is  presented  to the  Registrar  with a
request (1) to register the transfer of the Global Note or (2) to exchange  such
Global Notes for an equal principal amount of Notes of other denominations,  the
Registrar  shall register the transfer or make the exchange if its  requirements
for such  transactions are met;  provided,  however,  that any Note presented or
surrendered for  registration of transfer or exchange (A) shall be duly endorsed
or accompanied by a written  instruction of transfer in form satisfactory to the
Registrar and the Trustee duly executed by the Holder thereof or by his attorney
duly  authorized in writing and (B) in the case of a Restricted  Security,  such
request shall be accompanied by the following additional documents:  (i) if such
Restricted  Security  is  being  transferred  to the  Person  designated  by the
Depositary as being the  beneficial  owner, a  certification  to that effect (in
substantially  the form of Exhibit D attached  hereto),  (ii) if such Restricted
Security is being  transferred to a QIB in accordance with Rule 144A or pursuant
to an effective registration statement under the Securities 

                                       22
<PAGE>

Act, a  certification  to that  effect (in  substantially  the form of Exhibit D
attached hereto),  or (iii) if such Restricted  Security is being transferred in
reliance  on  another  exemption  from  the  registration  requirements  of  the
Securities Act, a  certification  to that effect (in  substantially  the form of
Exhibit D attached  hereto) and, if requested by the Company or the Trustee,  an
opinion of counsel  reasonably  acceptable  to the Company and to the Trustee to
the effect  that such  transfer is in  compliance  with the  Securities  Act. To
permit registrations of transfer and exchanges,  the Company shall issue and the
Trustee shall  authenticate  Notes at the Registrar's  request,  subject to such
rules as the Trustee may reasonably require.

                  (e) Cancellation and/or Adjustment of the Global Note. At such
time as all  beneficial  interests in the Global Note have either been exchanged
for Definitive Notes, redeemed,  repurchased or cancelled, the Global Note shall
be returned to or retained and  cancelled  by the Trustee.  At any time prior to
such  cancellation,  if any beneficial  interest in the Global Note is exchanged
for  Definitive  Notes,  redeemed,   repurchased  or  cancelled,  the  aggregate
principal  amount of Notes  represented  by such  Global  Note  shall be reduced
accordingly and an endorsement  shall be made on such Global Note by the Trustee
to reflect such reduction.

                  (f) General Provisions Relating to Transfers and Exchanges. To
permit registrations of transfers and exchanges effected in accordance with this
Indenture,  the Company  shall execute and the Trustee  shall  authenticate  the
Global Note and any Definitive Notes at the Registrar's request. The Global Note
and any Definitive Notes issued upon any registration of transfer or exchange of
beneficial  interests in the Global Note or the Definitive Notes shall be legal,
valid and binding  obligations  of the Company,  evidencing  the same debt,  and
entitled to the same benefits under this Indenture,  as the Definitive  Notes or
Global Notes surrendered upon such registration of transfer or exchange.

                  Neither the Company nor the Registrar shall be required to (a)
issue,  register the transfer of or exchange Notes during a period  beginning at
the opening of  business on a Business  Day 15 days before the day of mailing of
any notice of  redemption  of Notes under  Section 3.02 hereof and ending at the
close of business on the day of such  mailing or (b) register the transfer of or
exchange any Note so selected  for  redemption  in whole or in part,  except the
unredeemed portion of any Note being redeemed in part.

                  No  service  fee shall be  charged to any Holder of a Note for
any  registration  of  transfer  or  exchange  (except  as  otherwise  expressly
permitted  herein),  but the Company may require  payment of a sum sufficient to
cover any  transfer tax or similar  governmental  charge  payable in  connection
therewith (other than such transfer tax or similar  governmental  charge payable
upon exchanges  pursuant to Sections 2.10,  3.06 or 9.05 hereof,  which shall be
paid by the Company).

                  Prior to due  presentment to the Trustee for  registration  of
the transfer of any Note, the Trustee, any Agent, the Company and each Guarantor
may deem and  treat  the  Person  in whose  name any Note is  registered  as the
absolute  owner of such Note for the purpose of  receiving  payment of principal
of,  premium,  if any,  and  interest  on such Note and for all  other  

                                       23
<PAGE>

purposes  whatsoever,  whether  or not  such  Note is  overdue,  and none of the
Trustee,  any Agent, the Company or any Guarantor shall be affected by notice to
the contrary.

                  (g)  General   Provisions   Relating   to  the  Global   Note.
Notwithstanding  any other  provision in this  Indenture,  no Global Note may be
transferred to, or registered or exchanged for Notes  registered in the name of,
any  Person  other  than the  Depositary  for such  Global  Note or any  nominee
thereof, and no such transfer may be registered,  unless (i) such Depositary (A)
notifies the Company  that it is  unwilling or unable to continue as  Depositary
for such Global Note or (B) ceases to be a clearing agency  registered under the
Exchange Act, (ii) the Company delivers to the Trustee an Officers'  Certificate
stating  that  such  Global  Note  shall be so  transferable,  registrable,  and
exchangeable, and such transfers shall be registrable, or (iii) there shall have
occurred  and be  continuing  an Event of  Default  with  respect  to the  Notes
evidenced  by such Global  Note.  Notwithstanding  any other  provision  in this
Indenture,  a Global Note to which the  restriction  set forth in the  preceding
sentence  shall  have  ceased to apply may be  transferred  only to,  and may be
registered and exchanged for Notes registered only in the name or names of, such
Person or Persons as the Depositary for such Global Note shall have directed and
no transfer  thereof  other than such a transfer may be  registered.  Every Note
authenticated and delivered upon registration of transfer of, or in exchange for
or in lieu of, a Global  Note to which  the  restriction  set forth in the first
sentence of this paragraph shall apply, whether pursuant to this Section 2.06 or
otherwise,  shall be authenticated and delivered in the form of, and shall be, a
Global Note.

                  (h) Exchange of Series A Notes for Series B Notes.  The Series
A Notes  may be  exchanged  for  Series  B Notes  pursuant  to the  terms of the
Exchange  Offer in  accordance  with the  procedures  set out under Section 2.16
hereof.

SECTION 2.07.       REPLACEMENT NOTES.

                  If any mutilated Note is  surrendered  to the Trustee,  or the
Company  and  the  Trustee  receive  evidence  to  their   satisfaction  of  the
destruction, loss or theft of any Note, the Company shall issue and the Trustee,
upon the written  order of the Company  signed by two  Officers of the  Company,
shall  authenticate  a  replacement  Note  (accompanied  by a  notation  of  the
Subsidiary  Guarantees  duly  endorsed  by  each  Guarantor)  if  the  Trustee's
requirements  for  replacements  of Notes  are met.  An  indemnity  bond must be
supplied by the Holder that is  sufficient  in the judgment of the Trustee,  the
Company and the Guarantors to protect the Company, the Guarantors,  the Trustee,
any Agent or any authenticating agent from any loss which any of them may suffer
if a Note is replaced.  Each of the Company,  the Guarantors and the Trustee may
charge for its expenses in replacing a Note.

                  Every  replacement  Note is an  additional  obligation  of the
Company and the  Guarantors and shall be entitled to all of the benefits of this
Indenture equally and ratably with all other Notes duly issued hereunder.

                                       24
<PAGE>

SECTION 2.08.       OUTSTANDING NOTES.

                  The  Notes   outstanding   at  any  time  are  all  the  Notes
authenticated by the Trustee except for those canceled by it, those delivered to
it for cancellation and those described in this Section 2.08 as not outstanding.
If a Note  is  replaced  pursuant  to  Section  2.07  hereof,  it  ceases  to be
outstanding  unless  the  Trustee  receives  proof  satisfactory  to it that the
replaced Note is held by a bona fide purchaser.  If the principal  amount of any
Note is considered  paid under Section 4.01 hereof,  it ceases to be outstanding
and interest on it ceases to accrue. Subject to Section 2.09 hereof, a Note does
not cease to be outstanding  because the Company,  a Guarantor,  a Subsidiary of
the Company or a Guarantor or an  Affiliate of the Company or a Guarantor  holds
the Note.

SECTION 2.09.       TREASURY NOTES.

                  In determining  whether the Holders of the required  principal
amount of Notes have concurred in any direction,  waiver or consent, Notes owned
by the Company,  any  Guarantor,  any of their  respective  Subsidiaries  or any
Affiliate  of the Company or any  Guarantor  shall be  considered  as though not
outstanding,  except that for purposes of determining  whether the Trustee shall
be protected  in relying on any such  direction,  waiver or consent,  only Notes
which a Responsible  Officer of the Trustee  actually knows to be so owned shall
be so considered.  Notwithstanding the foregoing,  Notes that are to be acquired
by the Company, any Guarantor, any Subsidiary of the Company or any Guarantor or
an  Affiliate  of the Company or any  Guarantor  pursuant to an exchange  offer,
tender offer or other  agreement shall not be deemed to be owned by the Company,
such Guarantor, a Subsidiary of the Company or such Guarantor or an Affiliate of
the Company or such  Guarantor  until  legal  title to such Notes  passes to the
Company, such Guarantor, such Subsidiary or such Affiliate, as the case may be.

SECTION 2.10.       TEMPORARY NOTES.

                  Until definitive Notes are ready for delivery, the Company may
prepare and the Trustee shall  authenticate  temporary  Notes  (accompanied by a
notation  of  the  Subsidiary  Guarantees  duly  endorsed  by  each  Guarantor).
Temporary Notes shall be  substantially  in the form of definitive Notes but may
have  variations  that the  Company  and the Trustee  consider  appropriate  for
temporary Notes.  Without  unreasonable delay, the Company shall prepare and the
Trustee, upon receipt of the written order of the Company signed by two Officers
of the Company,  shall authenticate  definitive Notes (accompanied by a notation
of the Subsidiary  Guarantees  duly endorsed by each  Guarantor) in exchange for
temporary Notes.  Until such exchange,  temporary Notes shall be entitled to the
same rights, benefits and privileges as definitive Notes.

SECTION 2.11.       CANCELLATION.

                  The Company at any time may  deliver  Notes to the Trustee for
cancellation.  The  Registrar  and Paying Agent shall forward to the Trustee any
Notes surrendered to them for registration of transfer, exchange or payment. The
Trustee  shall  cancel  all Notes  surrendered  for  registration  of  transfer,
exchange,  payment,  replacement or cancellation and shall return canceled 

                                       25
<PAGE>

Notes to the Company.  The Company may not issue new Notes to replace Notes that
it has  redeemed  or  paid  or that  have  been  delivered  to the  Trustee  for
cancellation.

SECTION 2.12.       DEFAULTED INTEREST.

                  If the  Company  and the  Guarantors  default  in a payment of
interest on the Notes,  the Company or any such  Guarantor (to the extent of its
obligations under its Subsidiary  Guarantee) shall pay the defaulted interest in
any lawful manner plus, to the extent lawful,  interest payable on the defaulted
interest,  to the Persons who are Holders of the Notes on a  subsequent  special
record  date,  which date shall be at the earliest  practicable  date but in all
events at least five  Business  Days prior to the payment  date, in each case at
the rate provided in the Notes and in Section 4.01 hereof. The Company shall fix
or cause to be fixed each such special  record date and payment date, and shall,
promptly  thereafter,  notify the  Trustee  of any such  date.  At least 15 days
before the special record date, the Company (or the Trustee,  in the name of and
at the expense of the Company)  shall mail to Holders of the Notes a notice that
states the special record date, the related  payment date and the amount of such
interest to be paid.

SECTION 2.13.       RECORD DATE.

                  The record date for  purposes of  determining  the identity of
Holders  of the  Notes  entitled  to vote or  consent  to any  action by vote or
consent  authorized  or permitted  under this  Indenture  shall be determined as
provided for in TIA ss. 316(c).

SECTION 2.14.       CUSIP NUMBER.

                  The Company in issuing the Notes may use a "CUSIP" number and,
if it does so, the Trustee  shall use the CUSIP number in notices of  redemption
or exchange as a convenience to Holders; provided that any such notice may state
that no  representation  is made as to the  correctness or accuracy of the CUSIP
number  printed  in the notice or on the Notes and that  reliance  may be placed
only on the other identification  numbers printed on the Notes. The Company will
promptly notify the Trustee of any change in the CUSIP number.

SECTION 2.15.       COMPUTATION OF INTEREST.

                  Interest  will be  computed  on the  basis of a  360-day  year
consisting of twelve 30-day months.

SECTION 2.16.       EXCHANGE OF SERIES A NOTES FOR SERIES B NOTES

                  The  Series  A  Notes  may be  exchanged  for  Series  B Notes
pursuant to the terms of the Exchange  Offer.  The Trustee and  Registrar  shall
make the exchange as follows:

                  The  Company  shall  present  the  Trustee  with an  Officers'
Certificate certifying the following:

                  (a) upon  issuance  of the  Series B Notes,  the  transactions
         contemplated by the Exchange Offer have been consummated;

                                       26
<PAGE>

                  (b) the principal  amount of Series A Notes properly  tendered
         in the Exchange Offer that are  represented by a Global Note for Series
         B Notes shall be registered and sent for each such Holder; and

                  (c) the principal  amount of Series A Notes properly  tendered
         in the Exchange  Offer that are  represented by Definitive  Notes,  the
         name of each Holder of such Definitive  Notes,  the principal amount at
         maturity  properly  tendered in the Exchange Offer by each such Holder,
         and the name and address to which  Definitive  Notes for Series B Notes
         shall be registered and sent for each such Holder.

                  The Trustee,  upon receipt of (i) such Officers'  Certificate,
(ii) an Opinion of Counsel  (x) to the effect  that the Series B Notes have been
registered  under Section 5 of the  Securities  Act and this  Indenture has been
qualified  under the TIA and (iii) a Company  Order,  shall  authenticate  (A) a
Global Note for Series B Notes in an  aggregate  principal  amount  equal to the
aggregate  principal  amount  of  Series A Notes  represented  by a Global  Note
indicated in such Officers' Certificate as having been properly tendered and (B)
Definitive  Notes for Series B Notes in an aggregate  principal  amount equal to
the aggregate  principal amount of Series A Notes registered in the names of the
Holders and  represented  by the  Definitive  Notes  indicated in such Officers'
Certificate as having been properly tendered.

                  If the principal amount at maturity of the Global Note for the
Series B Notes is less than the principal  amount at maturity of the Global Note
for the Series A Notes,  the Trustee  shall make an  endorsement  on such Global
Note for  Series A Notes  indicating  a  reduction  in the  principal  amount at
maturity represented thereby.

                  The Trustee shall deliver such  Definitive  Notes for Series B
Notes to the Holders thereof as indicated in such Officers' Certificate.

SECTION 2.17.       LEGENDS.

                  (a) Except as permitted by subsections (b) or (c) hereof, each
Note shall bear legends  relating to  restrictions  on transfer  pursuant to the
securities  laws in  substantially  the form set  forth on  Exhibit  A  attached
hereto.

                  (b)  Upon  any  sale  or  transfer  of a  Restricted  Security
(including  any  Restricted  Security  represented by a Global Note) pursuant to
Rule 144 under the  Securities  Act or  pursuant  to an  effective  registration
statement under the Securities  Act: (i) in the case of any Restricted  Security
that is a Definitive  Note,  the  Registrar  shall permit the Holder  thereof to
exchange such  Restricted  Security for a Definitive Note that does not bear the
legends required by subsection (a) above; and (ii) in the case of any Restricted
Security  represented by a Global Note,  such  Restricted  Security shall not be
required  to bear the  legends  required  by  subsection  (a)  above,  but shall
continue to be subject to the  provisions of Section  2.06(d)  hereof;  provided
however,  that with  respect to any  request  for an  exchange  of a  Restricted
Security that is  represented  by a Global Note for a Definitive  Note that does
not bear the legends required by subsection (a) above,  which request is made in
reliance  upon Rule 144,  the  Holder  thereof  shall  certify in writing to the
Registrar that such request is being made pursuant to Rule 144.

                                       27
<PAGE>

                  (c) The Company (and the Restricted  Subsidiaries) shall issue
and the Trustee shall authenticate Series B Notes in exchange for Series A Notes
accepted for exchange in the Exchange  Offer.  The Series B Notes shall not bear
the legends  required by subsection (a) above unless the Holder of such Series A
Notes is either (i) a  broker-dealer  who purchased such Series A Notes directly
from  the  Company  to  resell  pursuant  to Rule  144A or any  other  available
exemption  under  the  Securities  Act,  (ii)  a  Person  participating  in  the
distribution  of the  Series A Notes or (iii) a Person who is an  affiliate  (as
defined in Rule 144A) of the Company.


                                   ARTICLE 3.
                        REDEMPTION AND OFFERS TO PURCHASE

SECTION 3.01.       NOTICES TO TRUSTEE.

                  If the Company elects to redeem Notes pursuant to the optional
redemption  provisions of Section 3.07 hereof,  it shall furnish to the Trustee,
at least  45 days  but not  more  than 60 days  before  a  redemption  date,  an
Officers'  Certificate  setting forth (i) the Section of this Indenture pursuant
to which  the  redemption  shall  occur,  (ii) the  redemption  date,  (iii) the
principal amount of Notes to be redeemed and (iv) the redemption price.

SECTION 3.02.       SELECTION OF NOTES TO BE REDEEMED.

                  If less than all of the Notes are to be  redeemed at any time,
the Trustee shall select the Notes to be redeemed among the  applicable  Holders
of the Notes in  compliance  with the  requirements  of the  principal  national
securities exchange,  if any, on which the Notes are listed or, if the Notes are
not so  listed,  on a pro rata  basis,  by lot or in  accordance  with any other
method the Trustee  considers  fair and  appropriate,  provided that no Notes of
$1,000 or less shall be redeemed in part. In the event of partial  redemption by
lot, the  particular  Notes to be redeemed shall be selected,  unless  otherwise
provided herein,  not less than 30 nor more than 60 days prior to the redemption
date by the  Trustee  from the  outstanding  Notes  not  previously  called  for
redemption.

                  The Trustee  shall  promptly  notify the Company in writing of
the Notes  selected  for  redemption  and, in the case of any Note  selected for
partial  redemption,  the  principal  amount  thereof to be redeemed.  Notes and
portions of Notes selected  shall be in amounts of $1,000 or whole  multiples of
$1,000;  except  that if all of the Notes of a Holder  are to be  redeemed,  the
entire outstanding  amount of Notes held by such Holder,  even if not a multiple
of $1,000,  shall be  redeemed.  Except as provided in the  preceding  sentence,
provisions  of this  Indenture  that apply to Notes called for  redemption  also
apply to portions of Notes called for redemption.

SECTION 3.03.       NOTICE OF REDEMPTION.

                  At least 30 days but not more than 60 days before a redemption
date,  the Company  shall mail or cause to be mailed,  by first  class  mail,  a
notice of  redemption  to each  Holder  whose  Notes are to be  redeemed  at its
registered address.

                                       28
<PAGE>

                  The notice shall identify the Notes  (including  CUSIP number)
to be redeemed and shall state:

                           (a) the redemption date;

                           (b) the redemption price (including  accrued interest
                  and Liquidated Damages, if any, to the redemption date);

                           (c) if any  Note  is  being  redeemed  in  part,  the
                  portion of the  principal  amount of such Note to be  redeemed
                  and that,  after the  redemption  date upon  surrender of such
                  Note,  a new Note or Notes in  principal  amount  equal to the
                  unredeemed  portion shall be issued upon  cancellation  of the
                  original Note;

                           (d) the name and address of the Paying Agent;

                           (e)  that  Notes  called  for   redemption   must  be
                  surrendered  to the  Paying  Agent to collect  the  redemption
                  price;

                           (f) that,  unless the Company defaults in making such
                  redemption  payment,  interest and Liquidated Damages, if any,
                  on Notes  called for  redemption  shall cease to accrue on and
                  after the redemption date;

                           (g) the paragraph of the Notes and/or Section of this
                  Indenture  pursuant to which the Notes  called for  redemption
                  are being redeemed; and

                           (h)  that  no   representation  is  made  as  to  the
                  correctness or accuracy of the CUSIP number, if any, listed in
                  such notice or printed on the Notes.

                  At the Company's request, the Trustee shall give the notice of
redemption in the Company's name and at its expense; provided, however, that the
Company  shall  have  delivered  to the  Trustee,  at least 45 days prior to the
redemption date, an Officers' Certificate  requesting that the Trustee give such
notice and setting forth the information to be stated in such notice as provided
in the preceding paragraph.

SECTION 3.04.       EFFECT OF NOTICE OF REDEMPTION.

                  Once notice of redemption is mailed in accordance with Section
3.03 hereof,  Notes called for redemption become  irrevocably due and payable on
the redemption  date at the redemption  price. A notice of redemption may not be
conditional.  On and after the redemption  date,  unless the Company defaults in
the payment of the redemption price,  interest and Liquidated  Damages,  if any,
will cease to accrue on the Notes or portions  thereof called for redemption and
all rights of Holders with respect to such Notes will  terminate  except for the
right to receive payment of the redemption price upon surrender for redemption.

                                       29
<PAGE>

SECTION 3.05.       DEPOSIT OF REDEMPTION PRICE.

                  One Business  Day prior to the  redemption  date,  the Company
shall deposit with the Trustee or with the Paying Agent money  sufficient to pay
the redemption price of and accrued interest and Liquidated  Damages, if any, on
all Notes to be  redeemed on that date.  The  Trustee or the Paying  Agent shall
promptly  return to the  Company  any money  deposited  with the  Trustee or the
Paying  Agent by the  Company  in excess  of the  amounts  necessary  to pay the
redemption  price of, and accrued interest and Liquidated  Damages,  if any, on,
all Notes to be redeemed.

                  If the Company  complies with the  provisions of the preceding
paragraph, on and after the redemption date, interest and Liquidated Damages, if
any,  shall  cease to accrue on the Notes or the  portions  of Notes  called for
redemption,  whether or not such Notes are presented  for payment.  If a Note is
redeemed  on or after an  interest  record  date but on or prior to the  related
interest  payment  date,  then any accrued and unpaid  interest  and  Liquidated
Damages,  if any,  shall be paid to the  Person  in  whose  name  such  Note was
registered  at the close of business on such record date. If any Note called for
redemption  shall not be so paid upon  surrender for  redemption  because of the
failure of the  Company to comply with the  preceding  paragraph,  interest  and
Liquidated  Damages,  if any,  shall be paid on the unpaid  principal,  from the
redemption  date until such  principal is paid,  and to the extent lawful on any
interest not paid on such unpaid principal, in each case at the rate provided in
the Notes and in Section 4.01 hereof.

SECTION 3.06.       NOTES REDEEMED IN PART.

                  Upon surrender of a Note that is redeemed in part, the Company
shall  issue  and,  upon  the  Company's  written  request,  the  Trustee  shall
authenticate  for  the  Holder  at  the  expense  of  the  Company  a  new  Note
(accompanied  by a notation of the Subsidiary  Guarantees  duly endorsed by each
Guarantor)  equal in  principal  amount to the  unredeemed  portion  of the Note
surrendered.

SECTION 3.07.       OPTIONAL REDEMPTION.

                  Prior to July 1, 2004, the Notes will be subject to redemption
at any time at the  option of the  Company,  in whole or in part,  upon not less
than 30 nor more than 60 day's notice, at the Make-Whole Price, plus accrued and
unpaid interest and Liquidated  Damages, if any, to but excluding the applicable
redemption  date.  On and after  July 1,  2004,  the Notes  will be  subject  to
redemption at any time at the option of the Company,  in whole or in part,  upon
not  less  than 30 nor more  than 60  days'  notice,  at the  redemption  prices
(expressed as percentages of principal amount) set forth below, plus accrued and
unpaid interest and Liquidated  Damages, if any, to but excluding the applicable
redemption date, if redeemed during the twelve-month  period beginning on July 1
of the years indicated below:

                                       30
<PAGE>

Year                                                         Percentage

2004.............................................              104.125%
2005.............................................              102.750%
2006.............................................              101.375%
2007 and thereafter .............................              100.000%

                  Notwithstanding  the  foregoing,  at any time prior to July 1,
2002,  the Company may redeem up to 35% of the initial  principal  amount of the
Notes  originally  issued with the net proceeds of one or more Qualified  Equity
Offerings at a redemption price equal to 108.25% of the principal amount of such
Notes, plus accrued and unpaid interest and Liquidated  Damages,  if any, to but
excluding  the  redemption  date;  provided,  that at least 65% of the principal
amount of Notes  originally  issued remains  outstanding  immediately  after the
occurrence of any such redemption and that such redemption occurs within 60 days
following the closing of any such Qualified Equity Offering.

SECTION 3.08.       MANDATORY REDEMPTION.

                  Except as set forth below under  Section 4.10 and Section 4.14
hereof,  the Company  shall not be required to make sinking  fund or  redemption
payments with respect to the Notes.

SECTION 3.09.       ASSET SALE OFFERS.

                  In the event that the  Company  shall  commence  an Asset Sale
Offer pursuant to Section 4.10 hereof, it shall follow the procedures  specified
below:

                  The Asset Sale Offer shall  remain  open for 20 Business  Days
after the  Commencement  Date  relating to such Asset Sale Offer,  except to the
extent  required to be extended by  applicable  law (as so extended,  the "Offer
Period").  No later than one  Business  Day after the  termination  of the Offer
Period (the "Purchase  Date"),  the Company shall purchase the principal  amount
(the "Offer  Amount") of Notes required to be purchased in such Asset Sale Offer
pursuant to Sections  3.02 and 4.10 hereof or, if less than the Offer Amount has
been tendered, all Notes tendered in response to the Asset Sale Offer.

                  If the Purchase Date is on or after an interest payment record
date and on or before the  related  interest  payment  date,  any  interest  and
Liquidated  Damages accrued to such Purchase Date shall be paid to the Person in
whose name a Note is  registered  at the close of business on such record  date,
and no additional interest or Liquidated Damages shall be payable to Holders who
tender Notes pursuant to the Asset Sale Offer.

                  On the Commencement  Date of any Asset Sale Offer, the Company
shall send or cause to be sent,  by first  class  mail,  a notice to each of the
Holders,  with a copy to the Trustee.  Such notice, which shall govern the terms
of the Asset Sale Offer, shall contain all instructions and materials  necessary
to enable the Holders to tender Notes pursuant to the Asset Sale Offer and shall
state:

                                       31
<PAGE>

                  (1)      that the Asset Sale Offer is being made  pursuant  to
                           this  Section  3.09 and  Section  4.10 hereof and the
                           length  of time the Asset  Sale  Offer  shall  remain
                           open;

                  (2)      the Offer Amount, the purchase price and the Purchase
                           Date;

                  (3)      that any Note not  tendered or  accepted  for payment
                           shall  continue  to accrue  interest  and  Liquidated
                           Damages, if any;

                  (4)      that,  unless the Company  defaults in the payment of
                           the  purchase  price,  any Note  accepted for payment
                           pursuant  to the  Asset  Sale  Offer  shall  cease to
                           accrue interest and Liquidated Damages, if any, after
                           the Purchase Date;

                  (5)      that  Holders  electing  to  have  a  Note  purchased
                           pursuant to any Asset Sale Offer shall be required to
                           surrender the Note, with the form entitled "Option of
                           Holder to Elect  Purchase" on the reverse of the Note
                           completed, to the Company, a depositary, if appointed
                           by the  Company,  or a Paying  Agent  at the  address
                           specified  in  the  notice  prior  to  the  close  of
                           business on the Business Day  preceding  the Purchase
                           Date;

                  (6)      that  Holders  shall be entitled  to  withdraw  their
                           election if the Company,  depositary or Paying Agent,
                           as the  case may be,  receives,  not  later  than the
                           close of business on the Business Day  preceding  the
                           termination   of  the  Offer   Period,   a  facsimile
                           transmission  or letter setting forth the name of the
                           Holder,  the principal  amount of the Note the Holder
                           delivered  for  purchase  and a  statement  that such
                           Holder is  withdrawing  his election to have the Note
                           purchased;

                  (7)      that,  if the  aggregate  principal  amount  of Notes
                           surrendered by Holders exceeds the Offer Amount,  the
                           Trustee  shall  select the Notes to be purchased on a
                           pro  rata  basis  (with  such  adjustments  as may be
                           deemed  appropriate by the Company so that only Notes
                           in  denominations  of $1,000,  or integral  multiples
                           thereof, shall be purchased); and

                  (8)      that Holders whose Notes were  purchased only in part
                           shall be issued new Notes equal in  principal  amount
                           to the unpurchased portion of the Notes surrendered.

                  On or before  12:00 p.m. on each  Purchase  Date,  the Company
shall  irrevocably  deposit  with the  Trustee  or Paying  Agent in  immediately
available funds the aggregate  purchase price with respect to a principal amount
of  Notes  equal  to the  Offer  Amount,  together  with  accrued  interest  and
Liquidated  Damages,  if any, thereon, to be held for payment in accordance with
the terms of this Section 3.09. On the Purchase Date, the Company shall,  to the
extent  lawful,  (i)  accept  for  payment,  on a pro rata  basis to the  extent
necessary,  an  aggregate  principal  amount  equal to the Offer Amount of Notes
tendered  pursuant to the Asset Sale Offer, or if less 

                                       32
<PAGE>

than the Offer Amount has been tendered, all Notes or portions thereof tendered,
(ii)  deliver or cause the Paying  Agent or  depositary,  as the case may be, to
deliver to the  Trustee  Notes so accepted  and (iii)  deliver to the Trustee an
Officers'  Certificate stating that such Notes or portions thereof were accepted
for payment by the Company in  accordance  with the terms of this Section  3.09.
The Company, depositary or Paying Agent, as the case may be, shall promptly (but
in any case not later than three  Business Days after the Purchase Date) mail or
deliver to each  tendering  Holder an amount  equal to the  purchase  price with
respect to the Notes  tendered  by such  Holder and  accepted by the Company for
purchase, and the Company shall promptly issue a new Note, and the Trustee shall
authenticate  and  mail or  deliver  such new  Note,  to such  Holder,  equal in
principal amount to any unpurchased  portion of such Holder's Notes surrendered.
Any Note not  accepted  in the Asset  Sale  Offer  shall be  promptly  mailed or
delivered  by the  Company to the Holder  thereof.  The Company  shall  publicly
announce in a  newspaper  of general  circulation  the results of the Asset Sale
Offer on the Purchase Date.

                  The  Asset  Sale  Offer  shall  be  made  by  the  Company  in
compliance with all applicable laws, including,  without limitation,  Regulation
14E of the Exchange Act and the rules thereunder, to the extent applicable,  and
all other applicable federal and state securities laws.

                  Each  purchase  pursuant  to this  Section  3.09 shall be made
pursuant to the provisions of the second paragraph of Section 3.05 hereof to the
extent applicable.

                  In the event the amount of Excess Proceeds to be applied to an
Asset Sale Offer would  result in the  purchase  of a principal  amount of Notes
which is not evenly  divisible by $1,000,  the Trustee shall promptly  refund to
the  Company  the  portion of such  Excess  Proceeds  that is not  necessary  to
purchase the immediately lesser principal amount of Notes that is so divisible.


                                   ARTICLE 4.
                                    COVENANTS

SECTION 4.01.       PAYMENT OF NOTES.

                  The Company  shall pay or cause to be paid the  principal  of,
premium,  if any,  and  interest  on the Notes on the  dates  and in the  manner
provided  in the  Notes.  Principal,  premium,  if any,  and  interest  shall be
considered  paid on the date due if the Paying Agent,  if other than the Company
or a Restricted Subsidiary,  holds as of 10:00 a.m. Eastern Time on the due date
money deposited by the Company in immediately available funds and designated for
and sufficient to pay all principal, premium, if any, and interest then due. The
Company shall pay any and all amounts,  including without limitation  Liquidated
Damages,  if any, on the dates and in the manner required under the Registration
Rights Agreement.

                  The  Company  shall  pay  interest  (including   post-petition
interest in any proceeding under any Bankruptcy Law) on overdue principal at the
rate equal to 1% per annum in excess of the then applicable interest rate on the
Notes to the  extent  lawful;  it shall pay  interest  (including  

                                       33
<PAGE>

post-petition  interest in any proceeding  under any Bankruptcy  Law) on overdue
installments of interest  (without regard to any applicable grace period) at the
same rate to the extent lawful.

SECTION 4.02.       MAINTENANCE OF OFFICE OR AGENCY.

                  The Company shall  maintain in the Borough of  Manhattan,  the
City of New York,  an office or agency (which may be an office of the Trustee or
an  affiliate  of the Trustee,  Registrar  or  co-registrar)  where Notes may be
surrendered  for  registration of transfer or for exchange and where notices and
demands to or upon the Company or any  Restricted  Subsidiary  in respect of the
Notes and this  Indenture may be served.  The Company shall give prompt  written
notice to the Trustee of the location,  and any change in the location,  of such
office or agency.  If at any time the Company  shall fail to  maintain  any such
required  office or agency or shall fail to furnish the Trustee with the address
thereof,  such  presentations,  surrenders,  notices  and demands may be made or
served at the Corporate Trust Office of the Trustee.

                  The Company may also from time to time  designate  one or more
other offices or agencies  where the Notes may be presented or  surrendered  for
any or all such  purposes and may from time to time  rescind such  designations;
provided,  however,  that no such  designation or rescission shall in any manner
relieve  the  Company of its  obligation  to maintain an office or agency in the
Borough of Manhattan,  the City of New York for such purposes. The Company shall
give prompt written notice to the Trustee of any such  designation or rescission
and of any change in the location of any such other office or agency.

                  The Company hereby  designates  the Corporate  Trust Office of
the  Trustee  as one such  office or agency of the  Company in  accordance  with
Section 2.03 hereof.

SECTION 4.03.       REPORTS.

                  (a) Whether or not  required by the rules and  regulations  of
the SEC, so long as any Notes are  outstanding,  the Company will furnish to the
Holders of Notes (i) all quarterly and annual  financial  information that would
be required to be  contained  in a filing with the SEC on Forms 10-Q and 10-K if
the  Company  were  required  to file  such  Forms,  including  a  "Management's
Discussion and Analysis of Financial  Condition and Results of Operations"  and,
with respect to the annual  information  only, a report thereon by the Company's
certified independent  accountants and (ii) all financial information that would
be required to be included in a Form 8-K filed with the SEC if the Company  were
required to file such reports. In addition, whether or not required by the rules
and regulations of the SEC, the Company will file a copy of all such information
and reports with the SEC for public availability (unless the SEC will not accept
such a filing) and make such  information  available to investors who request it
in writing.  Notwithstanding  anything to the  contrary  contained  herein,  the
Trustee shall have no duty to review such  documents for purposes of determining
compliance with any provisions of this Indenture.

                  (b) So long as is  required  for an offer or sale of the Notes
to qualify for an exemption  under Rule 144A,  the Company  (and the  Restricted
Subsidiaries)  shall, upon request,  provide the information  required by clause
(d)(4)  thereunder to each 

                                       34
<PAGE>

Holder  and  to  each  beneficial  owner  and  prospective  purchaser  of  Notes
identified by any Holder of Restricted Securities.

                  (c) Delivery of such reports, information and documents to the
Trustee is for  informational  purposes only and the  Trustee's  receipt of such
shall not constitute constructive notice of any information contained therein or
determinable  from  information  contained  therein,   including  the  Company's
compliance  with any of its  covenants  hereunder  (as to which the  Trustee  is
entitled to rely exclusively on Officers' Certificates).

SECTION 4.04.       COMPLIANCE CERTIFICATE.

                  (a) The Company shall  deliver to the Trustee,  within 90 days
after the end of each fiscal year, an Officers' Certificate,  one of the signers
of which shall be the  principal  executive,  principal  financial  or principal
accounting  officer of the Company,  stating that a review of the  activities of
the Company and its Subsidiaries  during the preceding fiscal year has been made
under the supervision of the signing Officers with a view to determining whether
the Company and each  Restricted  Subsidiary has kept,  observed,  performed and
fulfilled its  obligations  under this Indenture  (including with respect to any
Restricted Payments made during such year, the basis upon which the calculations
required by Section 4.07 hereof were computed,  which  calculations may be based
on the Company's latest available financial statements), and further stating, as
to each such Officer  signing such  certificate,  that to the best of his or her
knowledge,  the  Company  and each  Restricted  Subsidiary  has kept,  observed,
performed and fulfilled each and every covenant  contained in this Indenture and
is  not in  default  in  the  performance  or  observance  of any of the  terms,
provisions  and  conditions  of this  Indenture  (or,  if a Default  or Event of
Default shall have  occurred,  describing all such Defaults or Events of Default
of which he or she may have  knowledge  and what  action  the  Company  and each
Restricted  Subsidiary,  as the case may be, is taking or  proposes to take with
respect  thereto)  and that to the  best of his or her  knowledge  no event  has
occurred and remains in existence by reason of which  payments on account of the
principal of or interest,  if any, on the Notes is  prohibited  or if such event
has occurred,  a  description  of the event and what action the Company and each
Restricted  Subsidiary,  as the case may be, is taking or  proposes to take with
respect thereto.

                  (b) So long as not contrary to the then  current  professional
standards  of the  American  Institute  of  Certified  Public  Accountants,  the
year-end financial statements delivered pursuant to Section 4.03 hereof shall be
accompanied  by  a  written  statement  of  the  Company's   independent  public
accountants  (who shall be a firm of established  national  reputation)  that in
conducting their audit of such financial  statements,  nothing has come to their
attention  that would lead them to believe  that the  Company has  violated  any
provisions  of  Article  4 or  Article  5  hereof  insofar  as they  pertain  to
accounting matters or, if any such violation has occurred, specifying the nature
and period of existence thereof, it being understood that such accountants shall
not be liable  directly  or  indirectly  to any Person for any failure to obtain
knowledge of any such violation.

                  (c)  The  Company  shall,  so  long  as any of the  Notes  are
outstanding,  deliver to the Trustee,  forthwith upon any Officer becoming aware
of any Default or Event of Default,  an 

                                       35
<PAGE>

Officers'  Certificate  specifying  such  Default or Event of  Default  and what
action the Company is taking or proposes to take with respect  thereto.  SECTION
4.05. TAXES.

                  The   Company   shall  pay,   and  shall  cause  each  of  its
Subsidiaries to pay, prior to delinquency,  all material taxes, assessments, and
governmental  levies  except  (i) such as are  contested  in good  faith  and by
appropriate  proceedings  or (ii) the  nonpayment of which would not  materially
adversely affect the business,  condition (financial or otherwise),  operations,
performance or properties of the Company and its Subsidiaries, taken as a whole.

SECTION 4.06.       STAY, EXTENSION AND USURY LAWS.

                  Each of the  Company  and  the  Guarantors  covenants  (to the
extent that it may  lawfully  do so) that it shall not at any time insist  upon,
plead,  or in any manner  whatsoever  claim or take the benefit or advantage of,
any stay,  extension or usury law wherever enacted, now or at any time hereafter
in force,  that may affect the covenants or the  performance of this  Indenture;
and each of the Company and the  Guarantors  (to the extent that it may lawfully
do so) hereby  expressly  waives all benefit or  advantage  of any such law, and
covenants that it shall not, by resort to any such law, hinder,  delay or impede
the execution of any power herein  granted to the Trustee,  but shall suffer and
permit the execution of every such power as though no such law has been enacted.

SECTION 4.07.       RESTRICTED PAYMENTS.

                  The  Company  will  not,  and  will  not  permit  any  of  its
Restricted  Subsidiaries  to,  directly  or  indirectly:  (a) declare or pay any
dividend  or make any  distribution  on account of the  Company's  or any of its
Restricted Subsidiaries' Equity Interests (other than dividends or distributions
payable in Equity  Interests (other than  Disqualified  Stock) of the Company or
such Restricted  Subsidiary or dividends or distributions payable to the Company
or any  Restricted  Subsidiary);  (b) purchase,  redeem or otherwise  acquire or
retire  for  value  any  Equity  Interests  of the  Company  or  any  Restricted
Subsidiary  or other  Affiliate  of the  Company  (other  than  any such  Equity
Interests  owned by the Company or any  Restricted  Subsidiary);  (c)  purchase,
redeem or otherwise acquire or retire prior to scheduled  maturity for value any
Indebtedness  that is subordinated in right of payment to the Notes; or (d) make
any Investment  other than a Permitted  Investment  (all such payments and other
actions set forth in clauses (a) through (d) above being  collectively  referred
to as "Restricted Payments"), unless, at the time of such Restricted Payment:

                  (i) no Default or Event of Default  shall have occurred and be
         continuing or would occur as a consequence thereof; and

                  (ii) the Company would, at the time of such Restricted Payment
         and after giving pro forma effect thereto, have been permitted to incur
         at least  $1.00 of  additional  Indebtedness  pursuant  to the test set
         forth in the first paragraph of Section 4.09 hereof; and

                                       36
<PAGE>

                  (iii) such Restricted Payment,  together with the aggregate of
         all other  Restricted  Payments made by the Company and its  Restricted
         Subsidiaries  after the date of the 1996 Indenture is less than (x) the
         cumulative  EBITDA of the  Company  minus  1.75  times  the  cumulative
         Consolidated  Interest  Expense  of the  Company,  in each case for the
         period (taken as one accounting  period) from June 30, 1996, to the end
         of the Company's  most recently ended fiscal quarter for which internal
         financial  statements  are  available  at the  time of such  Restricted
         Payment,  plus (y) the  aggregate net Equity  Proceeds  received by the
         Company from the issuance or sale since the date of the 1996  Indenture
         of Equity Interests of the Company or of debt securities of the Company
         that have been converted into such Equity  Interests (other than Equity
         Interests  or  convertible   debt   securities  sold  to  a  Restricted
         Subsidiary  of the  Company and other than  Disqualified  Stock or debt
         securities that have been converted into Disqualified  Stock), plus (z)
         $2.0 million.

                  The foregoing  provisions will not prohibit (A) the payment of
any dividend  within 60 days after the date of declaration  thereof,  if at said
date of declaration such payment would have complied with the provisions of this
Indenture;  (B) the redemption,  repurchase,  retirement or other acquisition or
retirement for value of any Equity  Interests of the Company in exchange for, or
with the net cash proceeds of, the substantially  concurrent sale (other than to
a Restricted Subsidiary of the Company) of other Equity Interests of the Company
(other than any Disqualified Stock); (C) the defeasance, redemption, repurchase,
retirement or other  acquisition or retirement for value of Indebtedness that is
subordinated  or pari passu in right of payment to the Notes in exchange for, or
with the net cash  proceeds  of, a  substantially  concurrent  issuance and sale
(other than to a Restricted  Subsidiary  of the Company) of Equity  Interests of
the Company (other than  Disqualified  Stock);  (D) the defeasance,  redemption,
repurchase,   retirement  or  other  acquisition  or  retirement  for  value  of
Indebtedness that is subordinated or pari passu in right of payment to the Notes
in exchange  for, or with the net cash proceeds of, a  substantially  concurrent
issue and sale (other than to the Company or any of its Restricted Subsidiaries)
of Refinancing Indebtedness; (E) the repurchase of any Indebtedness subordinated
or pari passu in right of payment to the Notes at a purchase  price not  greater
than 101% of the principal amount of such  Indebtedness in the event of a Change
of Control in accordance  with  provisions  similar to the covenant set forth in
Section  4.14  hereof,  provided  that prior to or  contemporaneously  with such
repurchase  the Company has made the Change of Control Offer as provided in such
covenant  with  respect  to the Notes  and has  repurchased  all  Notes  validly
tendered for payment in connection  with such Change of Control  Offer;  and (F)
additional  payments to current or former  employees or directors of the Company
for repurchases of stock, stock options or other equity interests, provided that
the aggregate  amount of all such payments under this clause (F) does not exceed
$500,000 in any year and $2.0 million in the aggregate.

                  The Restricted Payments described in clauses (B), (C), (E) and
(F) of the immediately preceding paragraph will be Restricted Payments that will
be permitted to be taken in accordance  with such  paragraph but will reduce the
amount that would  otherwise be available for  Restricted  Payments under clause
(iii) of the  first  paragraph  of this  section,  and the  Restricted  Payments
described in clauses (A) and (D) of the immediately  preceding paragraph will be
Restricted  Payments that will be permitted to be taken in accordance  with such
paragraph  and 

                                       37
<PAGE>

will not reduce the amount that would  otherwise  be  available  for  Restricted
Payments under clause (iii) of the first paragraph of this section.

                  If  an  Investment  results  in  the  making  of a  Restricted
Payment,  the aggregate  amount of all Restricted  Payments  deemed to have been
made as calculated  under the foregoing  provision will be reduced by the amount
of any net reduction in such Investment  (resulting from the payment of interest
or  dividends,  loan  repayment,  transfer of assets or otherwise) to the extent
such net reduction is not included in the Company's EBITDA;  provided,  however,
that the total amount by which the aggregate  amount of all Restricted  Payments
may be reduced  may not exceed the lesser of (a) the cash  proceeds  received by
the  Company  and its  Restricted  Subsidiaries  in  connection  with  such  net
reduction and (b) the initial amount of such Investment.

                  If the aggregate amount of all Restricted  Payments calculated
under  the  foregoing  provision  includes  an  Investment  in  an  Unrestricted
Subsidiary or other Person that thereafter becomes a Restricted Subsidiary, such
Investment  will no longer be counted as a  Restricted  Payment for  purposes of
calculating  the  aggregate  amount of Restricted  Payments.  For the purpose of
making any calculations under this Indenture, (a) an Investment will include the
fair market  value of the net assets of any  Restricted  Subsidiary  at the time
that such  Restricted  Subsidiary is designated an  Unrestricted  Subsidiary and
will  exclude  the fair  market  value  of the net  assets  of any  Unrestricted
Subsidiary  that is  designated  as a  Restricted  Subsidiary,  (b) any property
transferred to or from an Unrestricted  Subsidiary will be valued at fair market
value at the time of such transfer, provided that, in each case, the fair market
value of an asset or property is as determined by the Board of Directors in good
faith, and (c) subject to the foregoing,  the amount of any Restricted  Payment,
if other than cash,  will be determined  by the Board of  Directors,  whose good
faith determination will be conclusive.

                  The Board of Directors may  designate a Restricted  Subsidiary
to be an Unrestricted  Subsidiary in compliance  with Section 4.17 hereof.  Upon
such designation,  all outstanding Investments by the Company and its Restricted
Subsidiaries  (except  to the  extent  repaid  in  cash)  in the  Subsidiary  so
designated  will be deemed to be  Restricted  Payments  made at the time of such
designation and will reduce the amount  available for Restricted  Payments under
the  first  paragraph  of this  Section  4.07.  Such  designation  will  only be
permitted if such Restricted Payment would be permitted at such time and if such
Restricted   Subsidiary  otherwise  meets  the  definition  of  an  Unrestricted
Subsidiary.

SECTION 4.08.       DIVIDEND AND OTHER PAYMENT RESTRICTIONS AFFECTING RESTRICTED
                    SUBSIDIARIES.

                  The  Company  will  not,  and  will  not  permit  any  of  its
Restricted Subsidiaries to, directly or indirectly, create or otherwise cause or
suffer  to exist or become  effective  any  encumbrance  or  restriction  on the
ability of any Restricted  Subsidiary to (a) (i) pay dividends or make any other
distributions  to the Company or any of its Restricted  Subsidiaries  (A) on its
Capital Stock or (B) with respect to any other interest or participation  in, or
measured by, its profits,  or (ii) pay any  Indebtedness  owed to the Company or
any of its Restricted Subsidiaries, (b) make loans or advances to the Company or
any of its  Restricted  Subsidiaries  or (c) transfer 

                                       38
<PAGE>

any  of  its  properties  or  assets  to the  Company  or any of its  Restricted
Subsidiaries,  except for such encumbrances or restrictions existing under or by
reason of (1) Existing  Indebtedness as in effect on the date of this Indenture,
(2) the Credit Agreement as in effect as of the date of this Indenture,  and any
amendments,  modifications,   restatements,  renewals,  increases,  supplements,
refundings,  replacements or refinancing thereof, provided that such amendments,
modifications,   restatements,  renewals,  increases,  supplements,  refundings,
replacements  or  refinancings  are no more  restrictive  in the aggregate  with
respect to such dividend and other payment  restrictions than those contained in
the  Credit  Agreement  as in  effect  on the date of this  Indenture,  (3) this
Indenture  and the Notes,  (4)  applicable  law,  (5) any  instrument  governing
Indebtedness  or Capital Stock of a Person acquired by the Company or any of its
Restricted  Subsidiaries as in effect at the time of such acquisition (except to
the extent such Indebtedness was incurred in connection with or in contemplation
of such acquisition),  which encumbrance or restriction is not applicable to any
Person, or the properties or assets of any Person, other than the Person, or the
property or assets of the Person, so acquired,  provided that the EBITDA of such
Person is not taken into account in  determining  whether such  acquisition  was
permitted  by  the  terms  of  this  Indenture,   (6)  customary  non-assignment
provisions  in  leases  entered  into in the  ordinary  course of  business  and
consistent  with past  practices,  (7)  restrictions on the transfer of property
subject to purchase  money  obligations or Capital Lease  Obligations  otherwise
permitted  by clause (e) of  Section  4.09  hereof,  (8)  permitted  Refinancing
Indebtedness,  provided  that  the  restrictions  contained  in  the  agreements
governing such Refinancing Indebtedness are no more restrictive in the aggregate
than  those  contained  in  the  agreements  governing  the  Indebtedness  being
refinanced,  or (9) any agreement or  instrument  governing  Indebtedness  of an
Excluded  Restricted  Subsidiary provided that (i) at the time such agreement or
instrument  is  entered  into,  such  Excluded  Restricted  Subsidiary  and  its
Restricted  Subsidiaries  have a Leverage Ratio of less than 6.5 to 1.0 and (ii)
neither  such  Excluded   Restricted   Subsidiary  nor  any  of  its  Restricted
Subsidiaries shall,  directly or indirectly,  incur any Indebtedness  (including
Acquired  Debt) unless at the time of such  incurrence  and after giving  effect
thereto,  the Leverage  Ratio for such Excluded  Restricted  Subsidiary  and its
Restricted  Subsidiaries  would  be  less  than  6.5 to  1.0.  For  purposes  of
determining the Leverage Ratio under this clause (9) only, all references to the
"Company"  and  its  "Restricted  Subsidiaries"  or  similar  references  in the
definition of "Leverage  Ratio" and other  defined terms  necessary to determine
the  Leverage  Ratio  shall  be  deemed  to refer  to such  Excluded  Restricted
Subsidiary and its Restricted Subsidiaries, respectively.

SECTION 4.09.       INCURRENCE OF INDEBTEDNESS AND ISSUANCE OF PREFERRED STOCK.

                  The  Company  will  not,  and  will  not  permit  any  of  its
Restricted  Subsidiaries  to,  directly or  indirectly,  create,  incur,  issue,
assume,  guaranty or otherwise become directly or indirectly liable with respect
to (collectively,  "incur") any Indebtedness  (including  Acquired Debt) and the
Company will not permit any of its Restricted  Subsidiaries  to issue any shares
of preferred stock;  provided,  however, that the Company may incur Indebtedness
and may permit a Restricted  Subsidiary to incur  Indebtedness if at the time of
such incurrence and after giving effect thereto the Leverage Ratio would be less
than 6.5 to 1.0.

                  The foregoing limitations will not apply to (a) the incurrence
by the Company or any Restricted  Subsidiary of Senior Bank Debt in an aggregate
amount  not to  exceed  $100.0  

                                       39
<PAGE>

million  at any  one  time  outstanding,  (b)  the  issuance  by the  Restricted
Subsidiaries of Subsidiary Guarantees, (c) the incurrence by the Company and its
Restricted  Subsidiaries of the Existing  Indebtedness,  (d) the issuance by the
Company of the Notes,  (e) the  incurrence  by the  Company  and its  Restricted
Subsidiaries  of  Capital  Lease  Obligations  and/or  additional   Indebtedness
constituting  purchase  money  obligations up to an aggregate of $5.0 million at
any one time  outstanding,  provided that the Liens  securing such  Indebtedness
constitute  Permitted Liens, (f) the incurrence of Indebtedness  between (i) the
Company and its Restricted  Subsidiaries  and (ii) the Restricted  Subsidiaries,
(g) Hedging  Obligations  that are incurred for the purpose of fixing or hedging
interest  rate risk with  respect  to any  floating  rate  Indebtedness  that is
permitted by the terms of this Indenture to be  outstanding,  (h) the incurrence
by the Company and its Restricted  Subsidiaries of  Indebtedness  arising out of
letters of credit,  performance  bonds,  surety bonds and  bankers'  acceptances
incurred in the  ordinary  course of business up to an aggregate of $5.0 million
at any  one  time  outstanding,  (i)  the  incurrence  by the  Company  and  its
Restricted Subsidiaries of Indebtedness consisting of guarantees, indemnities or
obligations  in respect of purchase  price  adjustments  in connection  with the
acquisition or disposition of assets, including,  without limitation,  shares of
Capital  Stock,  and (j)  the  incurrence  by the  Company  and  its  Restricted
Subsidiaries of Refinancing Indebtedness issued in exchange for, or the proceeds
of which are used to repay, redeem, defease, extend,  refinance,  renew, replace
or refund,  Indebtedness  referred to in clauses (b) through (e) above, and this
clause (j).

SECTION 4.10.       ASSET SALES.

                  The  Company  will  not,  and  will  not  permit  any  of  its
Restricted  Subsidiaries to, (a) sell, lease, convey or otherwise dispose of any
assets  (including by way of a Sale and Leaseback  Transaction,  but excluding a
Qualifying Sale and Leaseback  Transaction) other than sales of inventory in the
ordinary course of business (provided that the sale, lease,  conveyance or other
disposition  of all or  substantially  all of the assets of the Company  will be
governed by the  provisions  of Section  4.14 hereof  and/or the  provisions  of
Section 5.01 hereof,  and not by the  provisions of this Section  4.10),  or (b)
issue or sell Equity Interests of any of its Restricted  Subsidiaries,  that, in
the case of either clause (a) or (b) above, whether in a single transaction or a
series of related  transactions,  (i) have a fair market value in excess of $2.0
million,  or (ii) result in Net Proceeds in excess of $2.0 million  (each of the
foregoing,  an  "Asset  Sale"),  unless  (x)  the  Company  (or  the  Restricted
Subsidiary, as the case may be) receives consideration at the time of such Asset
Sale at  least  equal  to the  fair  market  value  (evidenced  by an  Officers'
Certificate  delivered to the Trustee,  and for Asset Sales having a fair market
value or resulting in net  proceeds in excess of $10.0  million,  evidenced by a
resolution  of the  Board of  Directors  set forth in an  Officers'  Certificate
delivered to the Trustee) of the assets sold or otherwise disposed of and (y) at
least  75%  of the  consideration  therefor  received  by the  Company  or  such
Restricted  Subsidiary is in the form of cash or like-kind  assets (in each case
as  determined  in good faith by the Company,  evidenced by a resolution  of the
Board of Directors  and certified by an Officers'  Certificate  delivered to the
Trustee); provided, however, that the amount of (A) any liabilities (as shown on
the Company's or such  Restricted  Subsidiary's  most recent balance sheet or in
the notes  thereto) of the  Company or such  Restricted  Subsidiary  (other than
liabilities that are by their terms  subordinated to the Notes or any Subsidiary
Guarantee)  that are  assumed by the  transferee  of any such assets and (B) any
notes or other obligations received by the Company or such 

                                       40
<PAGE>

Restricted Subsidiary from such transferee that are immediately converted by the
Company  or such  Restricted  Subsidiary  into  cash (to the  extent of the cash
received) or Cash  Equivalents,  shall be deemed to be cash for purposes of this
provision;  and provided,  further,  that the 75% limitation  referred to in the
foregoing clause (y) shall not apply to any Asset Sale in which the cash portion
of the  consideration  received  therefrom  is equal to or greater than what the
after-tax  proceeds  would  have  been had such  Asset  Sale  complied  with the
aforementioned  75%  limitation.  A  transfer  of assets or  issuance  of Equity
Interests by the Company to a Wholly Owned Restricted  Subsidiary or by a Wholly
Owned Restricted Subsidiary to the Company or to another Wholly Owned Restricted
Subsidiary will not be deemed to be an Asset Sale.

                  Within 360 days of any Asset  Sale,  the  Company  may, at its
option,  apply an amount equal to the Net  Proceeds  from such Asset Sale either
(a) to  permanently  reduce Senior Debt, or (b) to an investment in a Restricted
Subsidiary   or  in   another   business   or  capital   expenditure   or  other
long-term/tangible  assets,  in each case,  in the same line of  business as the
Company or any of its Restricted Subsidiaries was engaged in on the date of this
Indenture or in businesses  similar or reasonably  related thereto.  Pending the
final application of any such Net Proceeds,  the Company may temporarily  reduce
Senior Bank Debt or otherwise invest such Net Proceeds in any manner that is not
prohibited by this Indenture. Any Net Proceeds from such Asset Sale that are not
applied or invested as provided in the first  sentence of this paragraph will be
deemed to constitute  "Excess  Proceeds."  When the  aggregate  amount of Excess
Proceeds  exceeds $10.0 million,  the Company shall make an offer to all Holders
of Notes and the holders of the 1997 Notes and any future  Indebtedness  ranking
pari  passu with the  Notes,  which  Indebtedness  contains  similar  provisions
requiring the Company to repurchase such  Indebtedness  (an "Asset Sale Offer"),
to purchase the maximum  principal  amount of Notes and such other  Indebtedness
that may be purchased out of the Excess  Proceeds,  at an offer price in cash in
an amount equal to 100% of the principal  amount thereof plus accrued and unpaid
interest, if any, to the date of purchase, in accordance with the procedures set
forth in this Indenture;  provided, however, that prior to making any such Asset
Sale Offer,  the Company may, to the extent required by the 1996 Indenture,  use
such  Excess  Proceeds  to  repurchase  the 1996  Notes.  To the extent that the
aggregate amount of Notes and other pari passu Indebtedness  (including the 1997
Notes)  tendered  pursuant  to an  Asset  Sale  Offer is less  than  the  Excess
Proceeds,  the  Company  may use  any  remaining  Excess  Proceeds  for  general
corporate  purposes.  If the aggregate  principal amount of Notes and such other
Indebtedness  surrendered  by  Holders  thereof  exceeds  the  amount  of Excess
Proceeds,  the Trustee shall select the Notes and such other  Indebtedness to be
purchased on a pro rata basis.  Upon  completion of such offer to purchase,  the
amount of Excess Proceeds shall be reset at zero.

                  An Asset Sale Offer shall be made  pursuant to the  provisions
of Section 3.09 hereof. No later than the date which is five Business Days after
the date on which the aggregate amount of Excess Proceeds exceeds $10.0 million,
the  Company  shall  notify the Trustee of such Asset Sale Offer and provide the
Trustee with an Officers'  Certificate  setting forth the  calculations  used in
determining  the amount of Net  Proceeds to be applied to the purchase of Notes.
The Company  shall  commence or cause to be commenced  the Asset Sale Offer on a
date no later than 15 Business Days after such notice (the "Commencement Date").

                                       41
<PAGE>

SECTION 4.11.       TRANSACTIONS WITH AFFILIATES.

                  The  Company  will  not,  and  will  not  permit  any  of  its
Restricted Subsidiaries to, sell, lease, transfer or otherwise dispose of any of
its  properties  or assets to, or purchase any property or assets from, or enter
into any contract, agreement, understanding, loan, advance or guarantee with, or
for the  benefit  of,  any  Affiliate  (each  of the  foregoing,  an  "Affiliate
Transaction"),  unless (a) such  Affiliate  Transaction  is on terms that are no
less favorable to the Company or the relevant  Restricted  Subsidiary than those
that would have been obtained in a comparable transaction by the Company or such
Restricted  Subsidiary with a non-Affiliated Person and (b) the Company delivers
to the Trustee (i) with respect to any Affiliate Transaction involving aggregate
payments in excess of $5.0  million,  a resolution of the Board of Directors set
forth in an Officers'  Certificate  certifying  that such Affiliate  Transaction
complies with clause (a) above and such  Affiliate  Transaction is approved by a
majority of the  disinterested  members of the Board of Directors  and (ii) with
respect to any Affiliate  Transaction  involving aggregate payments in excess of
$10.0 million,  an opinion as to the fairness to the Company or such  Restricted
Subsidiary from a financial  point of view issued by an investment  banking firm
of national  standing;  provided,  however,  that (A) any  employment  agreement
entered  into  by the  Company  or any of  its  Restricted  Subsidiaries  in the
ordinary course of business and consistent with the past practice of the Company
or such Restricted  Subsidiary,  (B)  transactions  between or among the Company
and/or its Restricted Subsidiaries, (C) transactions permitted by the provisions
of Section 4.07 hereof and (D) the grant of stock, stock options or other equity
interests  to  employees  and  directors  of  the  Company  and  any  Restricted
Subsidiary in accordance with duly adopted Company stock grant, stock option and
similar plans, in each case,  shall not be deemed  Affiliate  Transactions;  and
further  provided that (1) the provisions of clause (b) shall not apply to sales
of inventory by the Company or any Restricted Subsidiary to any Affiliate in the
ordinary  course of business and (2) the  provisions of clause (b)(ii) shall not
apply to loans or advances to the Company or any Restricted  Subsidiary from, or
equity investments in the Company or any Restricted Subsidiary by, any Affiliate
to the extent permitted by Section 4.09 hereof.

SECTION 4.12.       LIENS.

                  The  Company  shall  not,  and  shall  not  permit  any of its
Restricted  Subsidiaries to, directly or indirectly,  create,  incur,  assume or
suffer to exist any Lien  (other  than a  Permitted  Lien) upon any  property or
assets now owned or  hereafter  acquired,  or any  income,  profits or  proceeds
therefrom,  or assign or otherwise convey any right to receive income therefrom,
unless (a) in the case of any Lien securing any Indebtedness that is subordinate
to the  Notes,  the  Notes are  secured  by a Lien on such  property,  assets or
proceeds  that is  senior  in  priority  to such Lien and (b) in the case of any
other Lien,  the Notes are equally and ratably  secured with the  obligation  or
liability secured by such Lien.

SECTION 4.13.       ADDITIONAL SUBSIDIARY GUARANTEES.

                  If any entity (other than an Excluded  Restricted  Subsidiary)
shall become a Restricted Subsidiary after the date of this Indenture, then such
Restricted  Subsidiary  shall  

                                       42
<PAGE>

execute a  Subsidiary  Guarantee  and deliver an opinion of counsel with respect
thereto, in accordance with the terms of this Indenture.

                  No Restricted  Subsidiary  (including any Excluded  Restricted
Subsidiary)  shall  consolidate  with or merge with or into (whether or not such
Restricted  Subsidiary is the surviving Person),  another Person (other than the
Company)  whether or not affiliated with such Restricted  Subsidiary  unless (a)
subject to the  provisions of the following  paragraph,  the Person formed by or
surviving  any such  consolidation  or  merger  (if other  than such  Restricted
Subsidiary) assumes all the obligations of such Restricted  Subsidiary under its
Subsidiary  Guarantee (except in the case of an Excluded Restricted  Subsidiary)
pursuant  to  a  supplemental   indenture  in  form  and  substance   reasonably
satisfactory  to the  Trustee;  (b)  immediately  after  giving  effect  to such
transaction,  no  Default or Event of Default  exists;  and (c) such  Restricted
Subsidiary,  or any Person  formed by or  surviving  any such  consolidation  or
merger,  would be permitted to incur,  immediately  after giving  effect to such
transaction,  at least $1.00 of additional Indebtedness pursuant to Section 4.09
hereof.

                  In the event of (a) a sale or other  disposition of all of the
assets  of  any  Restricted  Subsidiary  by  way  of  merger,  consolidation  or
otherwise,  (b) a sale or other  disposition  of all of the capital stock of any
Restricted  Subsidiary,  or (c) the designation of a Restricted Subsidiary as an
Unrestricted  Subsidiary in accordance with the terms of Section 4.17, then such
Subsidiary  (in the  event  of a sale  or  other  disposition,  by way of such a
merger,  consolidation  or  otherwise,  of all  of the  capital  stock  of  such
Restricted  Subsidiary,  or in the event of the  designation of such  Restricted
Subsidiary  as an  Unrestricted  Subsidiary)  or the  corporation  acquiring the
property  (in the event of a sale or other  disposition  of all of the assets of
such  Restricted  Subsidiary)  shall be released and relieved of any obligations
under its Subsidiary  Guarantee;  provided that the Net Proceeds of such sale or
other  disposition are applied in accordance  with the applicable  provisions of
this Indenture.

SECTION 4.14.       OFFER TO PURCHASE UPON CHANGE OF CONTROL.

                  Upon the  occurrence  of a Change of  Control,  each Holder of
Notes will have the right to require the Company to  repurchase  all or any part
(equal  to  $1,000 or an  integral  multiple  thereof)  of such  Holder's  Notes
pursuant  to the offer  described  below (the  "Change of Control  Offer") at an
offer price in cash equal to 101% of the aggregate principal amount thereof plus
accrued and unpaid interest and Liquidated Damages, if any, to but excluding the
date of purchase  (the  "Change of Control  Payment").  Within 30 calendar  days
following  any Change of Control,  the Company will mail a notice to each Holder
stating:

                           (a) that the  Change of  Control  Offer is being made
                  pursuant to this Section 4.14 and that all Notes tendered will
                  be accepted for payment;

                           (b) the purchase price and the purchase  date,  which
                  will be no  earlier  than 30  calendar  days nor later than 60
                  calendar days from the date such notice is mailed (the "Change
                  of Control Payment Date");

                           (c)  that  any Note not  tendered  will  continue  to
                  accrue interest;

                                       43
<PAGE>

                           (d) that,  unless the Company defaults in the payment
                  of the  Change of  Control  Payment,  all Notes  accepted  for
                  payment  pursuant to the Change of Control Offer will cease to
                  accrue interest and Liquidated  Damages,  if any, on and after
                  the Change of Control Payment Date;

                           (e) that Holders electing to have any Notes purchased
                  pursuant  to a Change of  Control  Offer will be  required  to
                  surrender the Notes,  with the form entitled "Option of Holder
                  to Elect Purchase" on the reverse of the Notes  completed,  to
                  the Paying Agent at the address specified in such notice prior
                  to the close of business on the fifth  Business Day  preceding
                  the Change of Control Payment Date;

                           (f) that Holders  will be entitled to withdraw  their
                  election  if the  Paying  Agent  receives,  not later than the
                  close of business on the second  Business  Day  preceding  the
                  Change of Control  Payment  Date,  facsimile  transmission  or
                  letter  setting  forth the name of the Holder,  the  principal
                  amount of Notes  delivered for purchase,  and a statement that
                  such  Holder is  withdrawing  his  election to have such Notes
                  purchased; and

                           (g) that Holders whose Notes are being purchased only
                  in part will be issued new Notes equal in principal  amount to
                  the  unpurchased  portion  of  the  Notes  surrendered,  which
                  unpurchased  portion  must be equal  to  $1,000  in  principal
                  amount or an integral multiple thereof.

The Company will comply with the  requirements  of Rule 14e-1 under the Exchange
Act and any other securities laws and regulations  thereunder to the extent such
laws and regulations are applicable to the repurchase of the Notes in connection
with a Change of Control.

                  On the Change of Control  Payment  Date,  the Company will, to
the extent  lawful,  (a) accept for payment Notes or portions  thereof  tendered
pursuant to the Change of Control  Offer,  (b) deposit  with the Paying Agent an
amount  equal to the  Change  of  Control  Payment  in  respect  of all Notes or
portions  thereof so tendered  and (c) deliver or cause to be  delivered  to the
Trustee the Notes so accepted together with an Officers' Certificate stating the
Notes or  portions  thereof  tendered  to the  Company.  The  Paying  Agent will
promptly mail to each Holder of Notes so accepted the Change of Control  Payment
for such Notes,  and the Trustee  will  promptly  authenticate  and mail to each
Holder a new Note equal in principal  amount to any  unpurchased  portion of the
Notes  surrendered,  if any;  provided  that  each  such new  Note  will be in a
principal amount of $1,000 or an integral multiple  thereof.  Prior to complying
with the  provisions of this Section  4.14,  but in any event within 90 calendar
days  following  a Change  of  Control,  the  Company  shall  either  repay  all
outstanding  Senior Debt or obtain the  requisite  consents,  if any,  under all
agreements  governing  outstanding Senior Debt to permit the repurchase of Notes
required by this Section 4.14. The Company shall  publicly  announce in The Wall
Street  Journal,  or if no longer  published,  a national  newspaper  of general
circulation,  the  results  of the  Change  of  Control  Offer  on or as soon as
practicable after the Change of Control Payment Date.

                                       44
<PAGE>

SECTION 4.15.       CORPORATE EXISTENCE.

                  Subject  to Article 5 and  Article 11 hereof,  as the case may
be, the Company and each of the Restricted  Subsidiaries shall do or cause to be
done all things  necessary to preserve and keep in full force and effect (i) its
corporate existence,  and the corporate,  partnership or other existence of each
of  their  Subsidiaries,   in  accordance  with  the  respective  organizational
documents  (as the same may be amended  from time to time) of the  Company,  any
such Restricted Subsidiary or any such Subsidiary,  as the case may be, and (ii)
the rights (charter and statutory),  licenses and franchises of the Company, the
Restricted Subsidiaries and their respective  Subsidiaries;  provided,  however,
that the  Company  and the  Restricted  Subsidiaries  shall not be  required  to
preserve any such right, license or franchise, or the corporate,  partnership or
other existence of any of their  respective  Subsidiaries,  if an officer of the
Company shall determine that the preservation  thereof is no longer desirable in
the conduct of the  business of the Company,  the  Restricted  Subsidiaries  and
their  Subsidiaries,  taken as a whole, and that the loss thereof is not adverse
in any material respect to the Holders of the Notes.

SECTION 4.16.       CERTAIN SENIOR SUBORDINATED DEBT.

                  Notwithstanding the provisions of Section 4.09 hereof, (a) the
Company shall not incur any Indebtedness that is subordinated or junior in right
of payment to any Senior  Debt of the Company and senior in any respect in right
of payment to the Notes,  and (b) the  Company  shall not permit any  Restricted
Subsidiary to incur any Indebtedness  that is subordinated or junior in right of
payment to its Senior  Debt and senior in any respect in right of payment to its
Subsidiary Guarantee.

SECTION 4.17.       DESIGNATION OF UNRESTRICTED SUBSIDIARIES.

                  The Board of Directors may designate any Subsidiary (including
any Restricted  Subsidiary or any newly acquired or newly formed  Subsidiary) to
be an  Unrestricted  Subsidiary  so long as: (i)  neither  the  Company  nor any
Restricted  Subsidiary is directly or indirectly  liable for any Indebtedness of
such  Subsidiary;  (ii) no  default  with  respect to any  Indebtedness  of such
Subsidiary would permit (upon notice,  lapse of time or otherwise) any holder of
any other Indebtedness of the Company or any Restricted  Subsidiary to declare a
default  on  such  other  Indebtedness  or  cause  the  payment  thereof  to  be
accelerated  or payable prior to its stated  maturity;  (iii) any  Investment in
such Subsidiary  deemed to be made as a result of designating such Subsidiary an
Unrestricted  Subsidiary will not violate the provisions of Section 4.07 hereof;
(iv)  neither  the  Company  nor  any  Restricted  Subsidiary  has  a  contract,
agreement, arrangement, understanding or obligation of any kind, whether written
or oral, with such Subsidiary other than (A) those that might be obtained at the
time from Persons who are not  Affiliates of the Company or (B)  administrative,
tax sharing and other ordinary course  contracts,  agreements,  arrangements and
understandings  or obligations  entered into in the ordinary course of business;
and (v) neither the Company nor any Restricted  Subsidiary has any obligation to
subscribe for  additional  shares of Capital Stock or other Equity  Interests in
such  Subsidiary,  or  to  maintain  or  preserve  such  Subsidiary's  financial
condition or to cause such  Subsidiary  to achieve  certain  levels of operating
results, other than as permitted under Section 4.07 hereof.  Notwithstanding the
foregoing,  the 

                                       45
<PAGE>

Company may not designate as an Unrestricted Subsidiary any Subsidiary which, on
the date of this  Indenture,  is a  Significant  Subsidiary,  and may not  sell,
transfer  or  otherwise  dispose  of  any  properties  or  assets  of  any  such
Significant Subsidiary to an Unrestricted Subsidiary, other than in the ordinary
course of business,  in each case, other than Iron Mountain Global, Inc. and its
Subsidiaries (including,  without limitation,  Britannia Data Management Limited
and its Subsidiaries).

                  The  Board  of  Directors  may   designate  any   Unrestricted
Subsidiary as a Restricted  Subsidiary;  provided that such  designation will be
deemed to be an incurrence  of  Indebtedness  by a Restricted  Subsidiary of any
outstanding  Indebtedness of such  Unrestricted  Subsidiary and such designation
will only be permitted if (i) such  Indebtedness is permitted under Section 4.09
hereof and (ii) no Default or Event of Default  would  occur as a result of such
designation.

SECTION 4.18.       LIMITATION ON SALE AND LEASEBACK TRANSACTIONS.

                  The  Company  will not,  and will not  permit  any  Restricted
Subsidiary  to,  enter into any Sale and  Leaseback  Transaction  unless (a) the
consideration  received in such Sale and Leaseback Transaction is at least equal
to the fair market value of the property  sold, as determined by a resolution of
the Board of Directors,  and (b) the Company or such Restricted Subsidiary could
incur the  Attributable  Indebtedness  in  respect  of such  Sale and  Leaseback
Transaction in compliance with Section 4.09 hereof.


                                   ARTICLE 5.
                                   SUCCESSORS

SECTION 5.01.       MERGER, CONSOLIDATION, OR SALE OF ASSETS.

                  The  Company  shall  not  consolidate  or  merge  with or into
(whether  or not the Company is the  surviving  corporation),  or sell,  assign,
transfer,  lease, convey or otherwise dispose of all or substantially all of its
properties  or assets in one or more  related  transactions,  to another  Person
unless (a) the Company is the surviving  corporation or the entity or the Person
formed by or  surviving  any such  consolidation  or merger  (if other  than the
Company) or to which such sale, assignment, transfer, lease, conveyance or other
disposition  shall have been made is a corporation  organized or existing  under
the laws of the United  States,  any state  thereof or the District of Columbia;
(b) the Person formed by or surviving any such consolidation or merger (if other
than the Company) or the Person to which such sale, assignment, transfer, lease,
conveyance or other disposition shall have been made assumes all the obligations
of the Company  under the Notes,  this  Indenture  (pursuant  to a  supplemental
indenture in a form reasonably satisfactory to the Trustee) and the Registration
Rights Agreement;  (c) immediately after such transaction no Default or Event of
Default  exists;  and (d) the Company or any Person  formed by or surviving  any
such  consolidation  or merger,  or to which such  sale,  assignment,  transfer,
lease, conveyance or other disposition shall have been made will, at the time of
such  transaction  and after  giving pro forma effect  thereto,  be permitted to
incur at least $1.00 of additional  Indebtedness pursuant to the first paragraph
of Section 4.09 hereof.

                                       46
<PAGE>

SECTION 5.02.       SUCCESSOR CORPORATION SUBSTITUTED.

                  Upon any  consolidation  or merger,  or any sale,  assignment,
transfer,  lease, conveyance or other disposition of all or substantially all of
the assets of the Company or the Company and its  Subsidiaries on a consolidated
basis in accordance with Section 5.01 hereof,  the successor  corporation formed
by such  consolidation  or into or with which the  Company is merged or to which
such sale, assignment,  transfer, lease, conveyance or other disposition is made
shall  succeed  to, and be  substituted  for (so that from and after the date of
such consolidation,  merger, sale, lease,  conveyance or other disposition,  the
provisions of this Indenture and the Registration  Rights Agreement referring to
the "Company"  shall refer instead to the successor  corporation  and not to the
Company),  and may  exercise  every  right and power of the  Company  under this
Indenture,  the Notes and the Registration Rights Agreement with the same effect
as if such  successor  Person had been named as the  Company  herein;  provided,
however,  that the predecessor Company shall not be relieved from the obligation
to pay the  principal  of and interest on the Notes except in the case of a sale
of all of the  Company's  assets  that meets the  requirements  of Section  5.01
hereof.


                                   ARTICLE 6.
                           CERTAIN DEFAULT PROVISIONS

SECTION 6.01.       EVENTS OF DEFAULT.

                  An "Event of Default" occurs if:

                  (a)  the  Company  defaults  in the  payment  of  interest  or
         Liquidated  Damages  on the Notes  (whether  or not  prohibited  by the
         subordination  provisions  of Article 10 hereof)  when the same becomes
         due and payable and such default continues for a period of 30 days;

                  (b) the Company  defaults in the  payment of  principal  of or
         premium  (including  any  Make-Whole  Amount),  if  any,  on the  Notes
         (whether or not prohibited by the  subordination  provisions of Article
         10 hereof)  when the same  becomes  due and payable at  maturity,  upon
         redemption  (including  in  connection  with an offer to  purchase)  or
         otherwise;

                  (c) the Company fails to comply with the provisions of Section
         4.14 hereof;

                  (d) the Company or any  Guarantor  fails to comply with any of
         its other respective  agreements or covenants in, or provisions of, the
         Notes,  the  Subsidiary  Guarantees  or this  Indenture and the Default
         continues for the period and after the notice specified below;

                  (e)  a  default  occurs  under  any  mortgage,   indenture  or
         instrument  under  which  there may be issued or by which  there may be
         secured or evidenced any Indebtedness for money borrowed by the Company
         or any of its  Restricted  Subsidiaries  (or the  payment  of  

                                       47
<PAGE>

         which  is  Guaranteed   by  the  Company  or  any  of  its   Restricted
         Subsidiaries),  whether such  Indebtedness  or Guarantee  now exists or
         shall  be  created  hereafter  if  (i)  such  default  results  in  the
         acceleration  of such  Indebtedness  prior to its  express  maturity or
         shall constitute a default in the payment of such Indebtedness at final
         maturity of such  Indebtedness  and (ii) the  principal  amount of such
         Indebtedness  that  has  been  accelerated  or not  paid  at  maturity,
         together with the principal amount of any other  Indebtedness  that has
         been accelerated or not paid at maturity, exceeds $10.0 million;

                  (f) a final  judgment  or final  judgments  for the payment of
         money  are  entered  by a court or  courts  of  competent  jurisdiction
         against  the  Company or any of its  Restricted  Subsidiaries  and such
         judgments  remain unpaid,  undischarged  or unstayed for a period of 60
         days,  provided that the aggregate of all such unpaid,  undischarged or
         unstayed judgments exceeds $10.0 million;

                  (g) except as otherwise  permitted  hereunder,  any Subsidiary
         Guarantee  issued  by a  Restricted  Subsidiary  shall  be  held in any
         judicial  proceeding to be  unenforceable or invalid or shall cease for
         any reason to be in full force and effect or any Restricted  Subsidiary
         (or its  successors or assigns),  or any Person acting on behalf of any
         Restricted  Subsidiary  (or its  successors or assigns),  shall deny or
         disaffirm its obligations in writing under its Subsidiary Guarantee;

                  (h) the Company or any of its Restricted  Subsidiaries that is
         a Significant Subsidiary:

                           (i) commences a voluntary case,

                           (ii)  consents  to the entry of an order  for  relief
                  against it in an involuntary case,

                           (iii)  consents to the  appointment of a Custodian of
                  it or for all or substantially all of its property,

                           (iv) makes a general  assignment  for the  benefit of
                  its creditors, or

                           (v) admits in writing its inability  generally to pay
                  its debts as the same become due,

                  in  each  case,  pursuant  to or  within  the  meaning  of any
         Bankruptcy Law; or

                  (i) a court  of  competent  jurisdiction  enters  an  order or
         decree under any Bankruptcy Law that:

                           (i)  is  for  relief   against  the  Company  or  any
                  Restricted Subsidiary that is a Significant  Subsidiary of the
                  Company in an involuntary case,

                           (ii)  appoints  a  Custodian  of the  Company  or any
                  Restricted Subsidiary that is a Significant  Subsidiary of the
                  Company or for all or substantially all of the 

                                       48
<PAGE>

                  property of the Company or any Restricted Subsidiary that is a
                  Significant Subsidiary of the Company, or

                           (iii)  orders the  liquidation  of the Company or any
                  Restricted Subsidiary that is a Significant  Subsidiary of the
                  Company,  and such  order or decree  remains  unstayed  and in
                  effect for 60 consecutive days.

                  A Default  under  clause (d) is not an Event of Default  until
the Trustee  notifies the  Company,  or the Holders of at least 25% in principal
amount of the then outstanding Notes notify the Company and the Trustee,  of the
Default and the Company does not cure the Default  within 60 days after  receipt
of the notice. The notice must be in writing,  must specify the Default,  demand
that it be remedied and state that the notice is a "Notice of Default."

                  In the case of any Event of Default pursuant to the provisions
of this Section 6.01  occurring  by reason of any willful  action (or  inaction)
taken  (or not  taken)  by or on behalf of the  Company  with the  intention  of
avoiding  payment of the Make-Whole  Price or premium,  as applicable,  that the
Company  would  have had to pay if the  Company  then had  elected to redeem the
Notes pursuant to Section 3.07 hereof,  the applicable  Make-Whole  Price, or an
equivalent  premium, as the case may be, shall become and be immediately due and
payable  to the  extent  permitted  by law  upon  acceleration  of the  Notes as
provided  below,  anything  in this  Indenture  or in the Notes to the  contrary
notwithstanding.

SECTION 6.02.       ACCELERATION.

                  If an  Event  of  Default  (other  than an  Event  of  Default
specified  in clauses  (h)(i)  through  (h)(v) and (i) of  Section  6.01  hereof
relating to the Company or any Significant Subsidiary) occurs and is continuing,
the  Trustee  by  notice  to the  Company,  or the  Holders  of at least  25% in
principal amount of the then outstanding  Notes by notice to the Company and the
Trustee  may  declare  the unpaid  principal  of and any  accrued  interest  and
Liquidated  Damages,  if any, on all the Notes to be due and payable.  Upon such
declaration the principal and interest and Liquidated  Damages, if any, shall be
due and payable  immediately  (together with the premium  referred to in Section
6.01 hereof,  if  applicable);  provided,  however,  that if any Obligation with
respect to Senior Bank Debt is outstanding pursuant to the Credit Agreement upon
a declaration of acceleration of the Notes, the principal,  premium, if any, and
interest and Liquidated  Damages, if any, on the Notes will not be payable until
the earlier of (1) the day which is five Business  Days after written  notice of
acceleration  is received by the Company and the Credit Agent,  and (2) the date
of acceleration of the Indebtedness  under the Credit Agreement.  If an Event of
Default specified in clauses (h)(i) through (h)(v) or (i) of Section 6.01 hereof
relating to the Company or any  Significant  Subsidiary  occurs,  such an amount
shall  ipso  facto  become  and be  immediately  due  and  payable  without  any
declaration or other act on the part of the Trustee or any Holder.  In the event
of a declaration  of  acceleration  of the Notes because an Event of Default has
occurred and is continuing as a result of the  acceleration of any  Indebtedness
described in Section  6.01(e)  hereof,  the  declaration of  acceleration of the
Notes  shall  be  automatically  annulled  if the  holders  of any  Indebtedness
described in Section  6.01(e) have rescinded the  declaration of acceleration in
respect of such Indebtedness  within 30 days of the 

                                       49
<PAGE>

date of such  declaration  and if (a) the annulment of the  acceleration  of the
Notes  would  not   conflict   with  any  judgment  or  decree  of  a  competent
jurisdiction,  and (b) all existing  Events of Default,  except  non-payment  of
principal  or  interest  on the Notes  that  became  due  solely  because of the
acceleration of the Notes, have been cured or waived.

SECTION 6.03.       OTHER REMEDIES.

                  If an Event of Default occurs and is  continuing,  the Trustee
may pursue any available remedy to collect the payment of principal, premium, if
any, and interest on the Notes or to enforce the performance of any provision of
the Notes or this Indenture.

                  The  Trustee  may  maintain a  proceeding  even if it does not
possess any of the Notes or does not produce  any of them in the  proceeding.  A
delay or omission by the Trustee or any Holder of a Note in exercising any right
or  remedy  upon an Event of  Default  shall not  impair  the right or remedy or
constitute a waiver of or acquiescence in the Event of Default. All remedies are
cumulative to the extent permitted by law.

SECTION 6.04.       WAIVER OF PAST DEFAULTS.

                  Holders of not less than a  majority  in  aggregate  principal
amount of the Notes then  outstanding  by notice to the Trustee may on behalf of
the Holders of all of the Notes waive any  existing  Default or Event of Default
and its consequences hereunder,  except a continuing Default or Event of Default
in the payment of the premium,  if any, interest and Liquidated Damages, if any,
on, or the  principal of the Notes  (including  in  connection  with an offer to
purchase)  (provided,  however,  that the  Holders  of a majority  in  aggregate
principal amount of the then  outstanding  Notes may rescind an acceleration and
its consequences,  including any related payment default that resulted from such
acceleration).  Upon any such waiver, such Default shall cease to exist, and any
Event of Default arising  therefrom shall be deemed to have been cured for every
purpose of this Indenture;  but no such waiver shall extend to any subsequent or
other Default or impair any right consequent thereon.

SECTION 6.05.       CONTROL BY MAJORITY.

                  Holders  of  a  majority  in  principal  amount  of  the  then
outstanding  Notes may  direct  the time,  method  and place of  conducting  any
proceeding for exercising any remedy  available to the Trustee or exercising any
trust or power  conferred on it.  However,  the Trustee may refuse to follow any
direction that conflicts with law or this Indenture that the Trustee  determines
may be unduly  prejudicial  to the rights of other  Holders of Notes or that may
involve the Trustee in personal liability.

SECTION 6.06.       LIMITATION ON SUITS.

                  A Holder of a Note  may  pursue a remedy with  respect to this
Indenture or the Notes if, and only if:

                                       50
<PAGE>

                  (a) the Holder of a Note gives to the Trustee  written  notice
         of a continuing  Event of Default or the Trustee  receives  such notice
         from the Company;

                  (b) the  Holders  of at least 25% in  principal  amount of the
         then outstanding  Notes make a written request to the Trustee to pursue
         the remedy;

                  (c) such  Holder of a Note or Holders of Notes  offer and,  if
         requested, provide to the Trustee indemnity satisfactory to the Trustee
         against any loss, liability or expense;

                  (d) the Trustee  does not comply  with the  request  within 60
         days after receipt of the request and the offer and, if requested,  the
         provision of indemnity; and

                  (e) during  such  60-day  period the  Holders of a majority in
         principal amount of the then outstanding  Notes do not give the Trustee
         a direction inconsistent with the request.

A Holder of a Note may not use this Indenture to prejudice the rights of another
Holder of a Note or to obtain a preference or priority over another  Holder of a
Note.  Nothing contained in this Section 6.06 shall affect the right of a Holder
of a Note to sue for enforcement of any overdue payment thereon.

SECTION 6.07.       RIGHTS OF HOLDERS OF NOTES TO RECEIVE PAYMENT.

                  Subject  to  Articles  10 and 11 hereof,  notwithstanding  any
other provision of this Indenture,  the right of any Holder of a Note to receive
payment of principal of, premium,  if any, and interest and Liquidated  Damages,
if any, on the Note, on or after the respective due dates  expressed in the Note
(including  in  connection  with a  Purchase  Offer),  or to bring  suit for the
enforcement of any such payment on or after such respective dates,  shall not be
impaired or affected without the consent of such Holder.

SECTION 6.08.       COLLECTION SUIT BY TRUSTEE.

                  If an Event of Default  specified  in  Section  6.01(a) or (b)
hereof occurs and is continuing,  the Trustee is authorized to recover  judgment
in its own name and as trustee of an express  trust  against the Company for the
whole amount of principal of, premium,  if any, interest and Liquidated Damages,
if any,  remaining unpaid on the Notes and interest on overdue principal and, to
the extent  lawful,  interest and such further  amount as shall be sufficient to
cover  the  costs  and  expenses  of   collection,   including  the   reasonable
compensation,  expenses,  disbursements and advances of the Trustee,  its agents
and counsel.

SECTION 6.09.       TRUSTEE MAY FILE PROOFS OF CLAIM.

                  The  Trustee is  authorized  to file such  proofs of claim and
other  papers or documents as may be necessary or advisable in order to have the
claims of the  Trustee  (including  any claim for the  reasonable  compensation,
expenses, disbursements and advances of the Trustee, its agents and counsel) and
the Holders of the Notes  allowed in any  judicial  proceedings  

                                       51
<PAGE>

relative to the  Company (or any other  obligor  upon the Notes,  including  the
Guarantors),  its  creditors or its property and shall be entitled and empowered
to  collect,  receive  and  distribute  any money or other  property  payable or
deliverable on any such claims and any custodian in any such judicial proceeding
is hereby authorized by each Holder to make such payments to the Trustee, and in
the event that the Trustee shall consent to the making of such payments directly
to the  Holders,  to pay to the Trustee any amount due to it for the  reasonable
compensation,  expenses,  disbursements and advances of the Trustee,  its agents
and counsel, and any other amounts due the Trustee under Section 7.07 hereof. To
the extent that the payment of any such  compensation,  expenses,  disbursements
and advances of the Trustee,  its agents and counsel,  and any other amounts due
the Trustee under Section 7.07 hereof out of the estate in any such  proceeding,
shall be denied for any  reason,  payment of the same shall be secured by a Lien
on,  and  shall be paid out of,  any and all  distributions,  dividends,  money,
securities and other  properties  that the Holders may be entitled to receive in
such proceeding  whether in liquidation or under any plan of  reorganization  or
arrangement or otherwise.  Nothing herein contained shall be deemed to authorize
the  Trustee  to  authorize  or  consent  to or accept or adopt on behalf of any
Holder  any  plan of  reorganization,  arrangement,  adjustment  or  composition
affecting the Notes or the rights of any Holder,  or to authorize the Trustee to
vote in respect of the claim of any Holder in any such proceeding.

SECTION 6.10.       PRIORITIES.

                  If the Trustee collects any money pursuant to this Article, it
shall pay out the money in the following order:

                  First:  to the Trustee,  its agents and  attorneys for amounts
         due under Section 7.07 hereof,  including  payment of all compensation,
         expense and liabilities incurred, and all advances made, by the Trustee
         and the costs and expenses of collection;

                  Second:  to the  holders of Senior  Debt of the Company or the
         Restricted Subsidiaries,  as the case may be, to the extent required by
         Article 10 or Article 11 hereof, as applicable;

                  Third:  to Holders of Notes for  amounts due and unpaid on the
         Notes for principal,  premium, if any, interest and Liquidated Damages,
         if any, ratably,  without preference or priority of any kind, according
         to the amounts due and payable on the Notes for principal,  premium, if
         any, interest and Liquidated Damages, respectively; and

                  Fourth:  to  the  Company  or to  such  party  as a  court  of
         competent jurisdiction shall direct.

                  The Trustee  may fix a record  date and  payment  date for any
payment to Holders of Notes pursuant to this Section 6.10.

                                       52
<PAGE>

SECTION 6.11.       UNDERTAKING FOR COSTS.

                  In any suit for the  enforcement  of any right or remedy under
this  Indenture  or in any suit  against  the  Trustee  for any action  taken or
omitted by it as a Trustee,  a court in its discretion may require the filing by
any party  litigant in the suit of an  undertaking to pay the costs of the suit,
and  the  court  in  its  discretion  may  assess  reasonable  costs,  including
reasonable attorneys' fees and expenses, against any party litigant in the suit,
having due regard to the merits and good faith of the claims or defenses made by
the party litigant. This Section does not apply to a suit by the Trustee, a suit
by a Holder of a Note  pursuant to Section 6.07 hereof,  or a suit by Holders of
more than 10% in principal amount of the then outstanding Notes.


                                   ARTICLE 7.
                                     TRUSTEE

SECTION 7.01.       DUTIES OF TRUSTEE.

                  (a) If an Event of Default has occurred and is continuing, the
Trustee  shall  exercise  such of the  rights  and  powers  vested in it by this
Indenture,  and use the same  degree  of care and  skill in its  exercise,  as a
prudent man would exercise or use under the  circumstances in the conduct of his
own affairs.

                  (b) Except during the continuance of an Event of Default:

                           (i) the  duties of the  Trustee  shall be  determined
                  solely by the express  provisions  of this  Indenture  and the
                  Trustee need  perform only those duties that are  specifically
                  set forth in this  Indenture  and no  others,  and no  implied
                  covenants  or  obligations  shall be read into this  Indenture
                  against the Trustee; and

                           (ii) in the  absence  of bad faith on its  part,  the
                  Trustee  may  conclusively  rely,  as  to  the  truth  of  the
                  statements  and  the  correctness  of the  opinions  expressed
                  therein,  upon  certificates  or  opinions  furnished  to  the
                  Trustee and conforming to the  requirements of this Indenture.
                  However,  in the case of any  such  certificates  or  opinions
                  which by any provision hereof are specifically  required to be
                  furnished to the Trustee, the Trustee shall be under a duty to
                  examine the same to  determine  whether or not they conform to
                  the  requirements  of this  Indenture (but need not confirm or
                  investigate the accuracy of mathematical calculations or other
                  facts stated therein).

                  (c) The Trustee may not be relieved from liability for its own
negligent  action,  its  own  negligent  failure  to  act,  or its  own  willful
misconduct, except that:

                           (i) this  paragraph  does not  limit  the  effect  of
                  paragraph (b) of this Section;

                                       53
<PAGE>

                           (ii) the Trustee shall not be liable for any error of
                  judgment made in good faith by a Responsible  Officer,  unless
                  it is proved that the Trustee was  negligent  in  ascertaining
                  the pertinent facts; and

                           (iii) the Trustee shall not be liable with respect to
                  any  action  it  takes  or  omits  to take in  good  faith  in
                  accordance with a direction received by it pursuant to Section
                  6.05 hereof.

                  (d)  Whether  or not  therein  expressly  so  provided,  every
provision of this Indenture that in any way relates to the Trustee is subject to
paragraphs (a), (b), and (c) of this Section.

                  (e) No provision of this  Indenture  shall require the Trustee
to expend or risk its own funds or incur any  liability.  The  Trustee  shall be
under no  obligation  to  exercise  any of its  rights  and  powers  under  this
Indenture at the request of any  Holders,  unless such Holder shall have offered
to the  Trustee  security  and  indemnity  satisfactory  to it against any loss,
liability or expense.

                  (f) The Trustee  shall not be liable for interest on any money
received  by it except as the  Trustee  may agree in writing  with the  Company.
Money held in trust by the  Trustee  need not be  segregated  from  other  funds
except to the extent required by law.

                  (g) Except with respect to Sections 4.01 and 4.04 herein,  the
Trustee  shall have no duty to inquire as to the  performance  of the  Company's
covenants in Article 4 hereof.  In addition,  the Trustee shall not be deemed to
have  knowledge  of any  Default  or Event of  Default  except  (i) any Event of
Default occurring pursuant to Sections 6.01(a), 6.01(b), 4.01 and 4.04 herein or
(ii) any  Default  or Event of  Default  of which a  Responsible  Officer of the
Trustee shall have received written notification or obtained actual knowledge.

SECTION 7.02.       RIGHTS OF TRUSTEE.

                  (a) The  Trustee  may  conclusively  rely  upon  any  document
believed by it to be genuine and to have been signed or  presented by the proper
Person.  The  Trustee  need not  investigate  any fact or  matter  stated in the
document.

                  (b) Before the Trustee acts or refrains  from  acting,  it may
require an Officers'  Certificate  or an Opinion of Counsel or both. The Trustee
shall not be liable  for any  action it takes or omits to take in good  faith in
reliance on such Officers'  Certificate  or Opinion of Counsel.  The Trustee may
consult with counsel of its choice and the advice of such counsel or any Opinion
of  Counsel  shall  be full  and  complete  authorization  and  protection  from
liability in respect of any action taken, suffered or omitted by it hereunder in
good faith and in reliance thereon.

                  (c) The Trustee may act through its  attorneys  and agents and
shall not be responsible for the misconduct or negligence of any agent appointed
with due care.

                                       54
<PAGE>

                  (d) The Trustee shall not be liable for any action it takes or
omits to take in good  faith that it  believes  to be  authorized  or within the
rights or powers conferred upon it by this Indenture.

                  (e) Unless otherwise  specifically provided in this Indenture,
any demand, request, direction or notice from the Company shall be sufficient if
signed by an Officer of the Company.

                  (f) The Trustee  shall be under no  obligation to exercise any
of the  rights  or powers  vested  in it by this  Indenture  at the  request  or
direction of any of the Holders  unless such  Holders  shall have offered to the
Trustee  reasonable  security  or  indemnity  against  the costs,  expenses  and
liabilities  that might be incurred  by it in  compliance  with such  request or
direction.

SECTION 7.03.       INDIVIDUAL RIGHTS OF TRUSTEE.

                  The Trustee in its individual or any other capacity may become
the owner or  pledgee  of Notes and may  otherwise  deal with the  Company,  any
Restricted  Subsidiary  or any  Affiliate  of  the  Company  or  any  Restricted
Subsidiary  with the same rights it would have if it were not Trustee.  However,
in the  event  that  the  Trustee  acquires  any  conflicting  interest  it must
eliminate  such  conflict  within 90 days,  apply to the SEC for  permission  to
continue  as trustee or resign.  Any Agent may do the same with like  rights and
duties. The Trustee is also subject to Sections 7.10 and 7.11 hereof.

SECTION 7.04.       TRUSTEE'S DISCLAIMER.

                  The  Trustee  shall  not  be  responsible  for  and  makes  no
representation as to the validity or adequacy of this Indenture or the Notes, it
shall not be accountable for the Company's use of the proceeds from the Notes or
any  money  paid to the  Company  or upon  the  Company's  direction  under  any
provision  of  this  Indenture,  it  shall  not be  responsible  for  the use or
application  of any money  received by any Paying  Agent other than the Trustee,
and it shall not be  responsible  for any  statement  or  recital  herein or any
statement in the Notes or any other document in connection  with the sale of the
Notes  or   pursuant  to  this   Indenture   other  than  its   certificate   of
authentication.

SECTION 7.05.       NOTICE OF DEFAULTS.

                  If a Default or Event of Default  occurs and is continuing and
if it is actually known to the Trustee, the Trustee shall mail to the Holders of
the Notes a notice of the  Default or Event of  Default  within 90 days after it
occurs.  Except in the case of a  Default  or Event of  Default  in  payment  of
principal of, premium,  if any, interest or Liquidated  Damages,  if any, on any
Note,  the Trustee may  withhold the notice if and so long as a committee of its
Responsible  Officers in good faith determines that withholding the notice is in
the interests of the Holders of the Notes.

                                       55
<PAGE>

SECTION 7.06.       REPORTS BY TRUSTEE TO HOLDERS OF THE NOTES.

                  Within 60 days after each April 15 beginning with the April 15
following  the  date  of  this  Indenture,  and  for so  long  as  Notes  remain
outstanding,  the Trustee  shall mail to the Holders of the Notes a brief report
dated as of such  reporting  date that  complies  with TIA ss. 313(a) (but if no
event  described  in TIA ss.  313(a)  has  occurred  within  the  twelve  months
preceding the reporting date, no report need be  transmitted).  The Trustee also
shall comply with TIA ss. 313(b)(2). The Trustee shall also transmit by mail all
reports as required by TIA ss. 313(c).

                  A copy of  each  report  at the  time  of its  mailing  to the
Holders of Notes  shall be mailed to the Company and filed with the SEC and each
stock exchange on which the Notes are listed in accordance  with TIA ss. 313(d).
The Company shall  promptly  notify the Trustee when the Notes are listed on any
stock exchange or of any delisting thereof.

SECTION 7.07.       COMPENSATION AND INDEMNITY.

                  The Company and the Restricted  Subsidiaries  shall be jointly
and  severally  obligated  to  pay  to  the  Trustee  from  time  to  time  such
compensation  as the Company  and the  Trustee  shall from time to time agree in
writing  for its  acceptance  of this  Indenture  and  services  hereunder.  The
Trustee's  compensation  shall not be  limited by any law on  compensation  of a
trustee of an express trust. The Company and the Restricted  Subsidiaries  shall
reimburse the Trustee  promptly upon request for all  reasonable  disbursements,
advances and expenses incurred or made by it in addition to the compensation for
its  services.   Such  expenses  shall  include  the  reasonable   compensation,
disbursements and expenses of the Trustee's agents and counsel.

                  The Company and the Restricted  Subsidiaries  shall  indemnify
each of the  Trustee  and any  predecessor  Trustee  against any and all losses,
liabilities,  damages,  claims or  expenses,  including  taxes (other than taxes
based  on the  income  of the  Trustee),  incurred  by it  arising  out of or in
connection  with the  acceptance  or  administration  of its  duties  under this
Indenture,  including the costs and expenses of enforcing this Indenture against
the Company and the Restricted  Subsidiaries  (including this Section 7.07), and
defending  itself  against  any claim  (whether  asserted  by the  Company,  any
Restricted  Subsidiary  or any  Holder  or any other  person)  or  liability  in
connection  with the  exercise  or  performance  of any of its  powers or duties
hereunder,  except to the  extent  any such loss,  liability  or expense  may be
attributable  to its  negligence  or bad faith.  The  Trustee  shall  notify the
Company  promptly of any claim for which it may seek  indemnity.  Failure by the
Trustee  to so  notify  the  Company  shall  not  relieve  the  Company  and the
Restricted  Subsidiaries  of their  obligations  hereunder.  The Company and the
Restricted  Subsidiaries  shall defend the claim and the Trustee shall cooperate
in the defense.  The Trustee may have  separate  counsel and the Company and the
Restricted  Subsidiaries  shall pay the  reasonable  fees and  expenses  of such
counsel.  The  Company  and the  Restricted  Subsidiaries  need  not pay for any
settlement  made without their consent,  which consent shall not be unreasonably
withheld.

                  The obligations of the Company and the Restricted Subsidiaries
under this Section 7.07 shall  survive the  satisfaction  and  discharge of this
Indenture.

                                       56
<PAGE>

                  To  secure  the  Company's  and the  Restricted  Subsidiaries'
payment obligations in this Section,  the Trustee shall have a Lien prior to the
Notes on all money or property  held or collected  by the  Trustee,  except that
held in trust to pay principal and interest on particular Notes. Such Lien shall
survive the satisfaction and discharge of this Indenture.

                  When the Trustee incurs expenses or renders  services after an
Event of Default specified in Section 6.01(h) or (i) hereof occurs, the expenses
and the  compensation  for the services  (including the fees and expenses of its
agents and counsel) are intended to constitute expenses of administration  under
any Bankruptcy Law.

                  The  Trustee  shall  comply  with  the  provisions  of TIA ss.
313(b)(2) to the extent applicable.

SECTION 7.08.       REPLACEMENT OF TRUSTEE.

                  A resignation  or removal of the Trustee and  appointment of a
successor  Trustee  shall become  effective  only upon the  successor  Trustee's
acceptance of appointment as provided in this Section.

                  The  Trustee  may  resign  in  writing  at  any  time  and  be
discharged  from the trust  hereby  created by so  notifying  the  Company.  The
Holders of Notes of a majority in principal amount of the then outstanding Notes
may remove the Trustee by so  notifying  the Trustee and the Company in writing.
The Company may remove the Trustee if:

                  (a) the Trustee fails to comply with Section 7.10 hereof;

                  (b) the Trustee is adjudged a bankrupt or an  insolvent  or an
         order for  relief is entered  with  respect  to the  Trustee  under any
         Bankruptcy Law;

                  (c) a Custodian or public  officer takes charge of the Trustee
         or its property; or

                  (d) the Trustee becomes incapable of acting.

                  If the Trustee resigns or is removed or if a vacancy exists in
the office of Trustee  for any  reason,  the Company  shall  promptly  appoint a
successor Trustee. Within one year after the successor Trustee takes office, the
Holders of a majority  in  principal  amount of the then  outstanding  Notes may
appoint a successor  Trustee to replace the successor  Trustee  appointed by the
Company.

                  If a successor  Trustee  does not take  office  within 60 days
after the retiring  Trustee  resigns or is removed,  the retiring  Trustee,  the
Company, any Restricted  Subsidiary,  or the Holders of Notes of at least 10% in
principal  amount of the then  outstanding  Notes  may,  at the  expense  of the
Company,  petition any court of competent  jurisdiction for the appointment of a
successor Trustee.

                  If the Trustee,  after written request by any Holder of a Note
who has been a Holder of a Note for at least six  months,  fails to comply  with
Section 7.10  hereof,  such Holder of 

                                       57
<PAGE>

a Note may petition any court of competent  jurisdiction  for the removal of the
Trustee and the appointment of a successor Trustee.

                  A successor Trustee shall deliver a written  acceptance of its
appointment  to  the  retiring  Trustee  and  to  the  Company.  Thereupon,  the
resignation or removal of the retiring Trustee shall become  effective,  and the
successor  Trustee  shall have all the rights,  powers and duties of the Trustee
under  this  Indenture.  The  successor  Trustee  shall  mail  a  notice  of its
succession to Holders of the Notes. The retiring Trustee shall promptly transfer
all property held by it as Trustee to the successor  Trustee,  provided all sums
owing to the Trustee  hereunder  have been paid and subject to the Lien provided
for in Section 7.07 hereof.  Notwithstanding replacement of the Trustee pursuant
to this Section 7.08, the Company's and the Restricted Subsidiaries' obligations
under  Section  7.07  hereof  shall  continue  for the  benefit of the  retiring
Trustee.

SECTION 7.09.       SUCCESSOR TRUSTEE BY MERGER, ETC.

                  If the  Trustee  consolidates,  merges or  converts  into,  or
transfers all or  substantially  all of its corporate trust business to, another
corporation,  the  successor  corporation  without  any further act shall be the
successor Trustee.

SECTION 7.10.       ELIGIBILITY; DISQUALIFICATION.

                  There  shall at all  times be a  Trustee  hereunder  that is a
corporation  organized and doing business under the laws of the United States of
America or of any state thereof that is  authorized  under such laws to exercise
corporate  trustee  power,  that is subject to  supervision  or  examination  by
federal or state  authorities and that has a combined  capital and surplus of at
least $50 million as set forth in its most  recent  published  annual  report of
condition.

                  This  Indenture  shall always have a Trustee who satisfies the
requirements  of TIA ss.  310(a)(1),  (2) and (5). The Trustee is subject to TIA
ss. 310(b).

SECTION 7.11.       PREFERENTIAL COLLECTION OF CLAIMS AGAINST COMPANY.

                  The  Trustee  is  subject  to TIA ss.  311(a),  excluding  any
creditor  relationship  listed in TIA ss. 311(b).  A Trustee who has resigned or
been removed shall be subject to TIA ss. 311(a) to the extent indicated therein.


                                   ARTICLE 8.
                    LEGAL DEFEASANCE AND COVENANT DEFEASANCE

SECTION 8.01.       OPTION TO EFFECT LEGAL DEFEASANCE OR COVENANT DEFEASANCE.

                  The  Company  may,  at the  option of its  Board of  Directors
evidenced by a resolution  set forth in an Officers'  Certificate,  at any time,
elect to have either  Section 8.02 or 8.03 hereof be applied to all  outstanding
Notes upon compliance with the conditions set forth below in this Article Eight.

                                       58
<PAGE>

SECTION 8.02.       LEGAL DEFEASANCE AND DISCHARGE.

                  Upon the Company's  exercise  under Section 8.01 hereof of the
option  applicable to this Section 8.02, each of the Company and the Guarantors,
if any,  shall,  subject  to the  satisfaction  of the  conditions  set forth in
Section 8.04 hereof, be deemed to have been discharged from its obligations with
respect  to all  outstanding  Notes and  Subsidiary  Guarantees  on the date the
conditions set forth below are satisfied (hereinafter,  "Legal Defeasance"). For
this purpose,  Legal  Defeasance  means that the Company shall be deemed to have
paid and  discharged  the entire  Indebtedness  represented  by the  outstanding
Notes,  which  shall  thereafter  be  deemed  to be  "outstanding"  only for the
purposes  of  Section  8.05  hereof  and the other  Sections  of this  Indenture
referred  to in (a)  and  (b)  below,  and  to  have  satisfied  all  its  other
obligations  under such Notes and this Indenture (and the Trustee,  on demand of
and  at  the  expense  of  the  Company,   shall  execute   proper   instruments
acknowledging the same), except for the following provisions which shall survive
until otherwise terminated or discharged hereunder: (a) the rights of Holders of
outstanding  Notes to receive  solely from the trust fund  described  in Section
8.04 hereof, and as more fully set forth in such Section, payments in respect of
the principal of, premium, if any, and interest on such Notes when such payments
are due, (b) the  Company's  and  Guarantors'  obligations  with respect to such
Notes under Article 2 and Section 4.02 hereof, (c) the rights,  powers,  trusts,
duties  and  immunities  of the  Trustee  hereunder  and the  Company's  and the
Guarantors'  obligations in connection therewith and (d) this Article 8. Subject
to  compliance  with this  Article 8, the Company may  exercise its option under
this Section 8.02 notwithstanding the prior exercise of its option under Section
8.03 hereof.

SECTION 8.03.       COVENANT DEFEASANCE.

                  Upon the Company's  exercise  under Section 8.01 hereof of the
option  applicable to this Section 8.03, each of the Company and the Guarantors,
if any,  shall,  subject  to the  satisfaction  of the  conditions  set forth in
Section  8.04  hereof,  be released  from its  obligations  under the  covenants
contained in Sections 4.05,  4.07,  4.08,  4.09,  4.10,  4.11, 4.12, 4.13, 4.14,
4.15, 4.16, 4.17 and Article V hereof with respect to the outstanding  Notes and
Subsidiary  Guarantees on and after the date the  conditions set forth below are
satisfied (hereinafter,  "Covenant Defeasance"),  and the Notes shall thereafter
be deemed not "outstanding" for the purposes of any direction,  waiver,  consent
or  declaration  or act of Holders  (and the  consequences  of any  thereof)  in
connection  with such covenants,  but shall continue to be deemed  "outstanding"
for all other purposes  hereunder (it being understood that such Notes shall not
be deemed  outstanding  for  accounting  purposes).  For this purpose,  Covenant
Defeasance  means that, with respect to the outstanding  Notes,  the Company may
omit to  comply  with and  shall  have no  liability  in  respect  of any  term,
condition or  limitation  set forth in any such  covenant,  whether  directly or
indirectly,  by reason of any reference elsewhere herein to any such covenant or
by reason of any reference in any such covenant to any other provision herein or
in any other document and such omission to comply shall not constitute a Default
or an Event of Default  under  Section  6.01  hereof,  but,  except as specified
above,  the  remainder  of  this  Indenture,   such  Notes  and  the  Subsidiary
Guarantees, if any, shall be unaffected thereby. In addition, upon the Company's
exercise under Section 8.01 hereof of the option applicable to this Section 8.03
hereof,  subject to the satisfaction of the conditions set forth in Section 8.04
hereof,  Sections 

                                       59
<PAGE>

6.01(c)  through  6.01(f) and  Section  6.01(h)  and  6.01(i)  hereof  shall not
constitute Events of Default.

SECTION 8.04.       CONDITIONS TO LEGAL OR COVENANT DEFEASANCE.

                  The following  shall be the  conditions to the  application of
either Section 8.02 or 8.03 hereof to the outstanding Notes:

                  In order to  exercise  either  Legal  Defeasance  or  Covenant
Defeasance:

                  (a) the Company must irrevocably  deposit with the Trustee, in
         trust,  for the benefit of the Holders,  cash in United States dollars,
         non-callable  Government Securities,  or a combination thereof, in such
         amounts  as  will  be  sufficient,  in  the  opinion  of  a  nationally
         recognized firm of independent public accountants, to pay the principal
         of, premium,  if any, and interest and Liquidated  Damages,  if any, on
         the outstanding  Notes on the stated date for payment thereof or on the
         applicable  redemption  date, as the case may be, of such  principal or
         installment  of  principal  of,  premium,  if any,  or  interest on the
         outstanding Notes;

                  (b) in the case of an election under Section 8.02 hereof,  the
         Company  shall have  delivered  to the Trustee an Opinion of Counsel in
         the United States  (which  counsel may be an employee of the Company or
         any  Subsidiary  of the Company)  reasonably  acceptable to the Trustee
         confirming  that (A) the Company has received  from,  or there has been
         published  by, the Internal  Revenue  Service a ruling or (B) since the
         Issuance Date, there has been a change in the applicable federal income
         tax law,  in either case to the effect  that,  and based  thereon  such
         Opinion of Counsel shall confirm that,  the Holders of the  outstanding
         Notes will not recognize  income,  gain or loss for federal  income tax
         purposes  as a result of such Legal  Defeasance  and will be subject to
         federal  income tax on the same amounts,  in the same manner and at the
         same times as would have been the case if such Legal Defeasance had not
         occurred;

                  (c) in the case of an election under Section 8.03 hereof,  the
         Company  shall have  delivered  to the Trustee an Opinion of Counsel in
         the United States  (which  counsel may be an employee of the Company or
         any  Subsidiary  of the Company)  reasonably  acceptable to the Trustee
         confirming that the Holders of the outstanding Notes will not recognize
         income,  gain or loss for  federal  income tax  purposes as a result of
         such Covenant  Defeasance  and will be subject to federal income tax on
         the same  amounts,  in the same  manner  and at the same times as would
         have been the case if such Covenant Defeasance had not occurred;

                  (d) no Default or Event of Default  shall have occurred and be
         continuing on the date of such deposit or, insofar as Sections  6.01(h)
         and 6.01(i) hereof are  concerned,  at any time in the period ending on
         the 91st day after the date of deposit  (or  greater  period of time in
         which any such deposit of trust funds may remain  subject to Bankruptcy
         Law insofar as those apply to the deposit by the Company);

                                       60
<PAGE>

                  (e) such Legal  Defeasance  or Covenant  Defeasance  shall not
         result in a breach or violation of, or constitute a default under,  any
         material  agreement or instrument  (other than this Indenture) to which
         the  Company  or any of its  Subsidiaries  is a party or by  which  the
         Company or any of its Subsidiaries is bound;

                  (f) the Company shall have delivered to the Trustee an Opinion
         of Counsel to the effect that after the 91st day following the deposit,
         the trust  funds will not be  subject  to the effect of any  applicable
         bankruptcy,  insolvency,   reorganization  or  similar  laws  affecting
         creditors' rights generally;

                  (g)  the  Company  shall  have  delivered  to the  Trustee  an
         Officers'  Certificate  stating  that the  deposit  was not made by the
         Company  with the intent of  preferring  the  Holders of Notes over any
         other creditors of the Company with the intent of defeating, hindering,
         delaying or defrauding creditors of the Company or others; and

                  (h)  the  Company  shall  have  delivered  to the  Trustee  an
         Officers'  Certificate and an Opinion of Counsel, each stating that all
         conditions  precedent  provided for or relating to the Legal Defeasance
         or the Covenant Defeasance have been complied with.

SECTION 8.05.       DEPOSITED MONEY  AND  GOVERNMENT SECURITIES  TO  BE  HELD IN
                    TRUST; OTHER MISCELLANEOUS PROVISIONS.

                  Subject to Section  8.06  hereof,  all money and  non-callable
Government  Securities  (including  the  proceeds  thereof)  deposited  with the
Trustee (or other qualifying trustee,  collectively for purposes of this Section
8.05,  the  "Trustee")  pursuant  to  Section  8.04  hereof  in  respect  of the
outstanding  Notes  shall  be held in  trust  and  applied  by the  Trustee,  in
accordance with the provisions of such Notes and this Indenture, to the payment,
either  directly or through any Paying Agent  (including  the Company  acting as
Paying Agent) as the Trustee may determine,  to the Holders of such Notes of all
sums due and to become due thereon in respect of principal, premium, if any, and
interest and Liquidated  Damages,  if any, but such money need not be segregated
from other funds except to the extent required by law.

                  The Company and the  Guarantors  shall pay and  indemnify  the
Trustee against any tax, fee or other charge imposed on or assessed  against the
cash or non-callable  Government  Securities  deposited pursuant to Section 8.04
hereof or the principal and interest  received in respect thereof other than any
such tax,  fee or other charge which by law is for the account of the Holders of
the outstanding Notes.

                  Anything   in   this    Article    Eight   to   the   contrary
notwithstanding,  the Trustee  shall  deliver or pay to the Company from time to
time  upon the  request  of the  Company  any money or  non-callable  Government
Securities  held by it as provided in Section 8.04 hereof which,  in the opinion
of a nationally recognized firm of independent public accountants expressed in a
written certification thereof delivered to the Trustee (which may be the opinion
delivered  under Section  8.04(a)  hereof),  are in excess of the amount thereof
that  would then be  required  to be  deposited  to effect an  equivalent  Legal
Defeasance or Covenant Defeasance.

                                       61
<PAGE>

SECTION 8.06.       REPAYMENT TO COMPANY.

                  Any money  deposited with the Trustee or any Paying Agent,  or
then held by the Company, in trust for the payment of the principal of, premium,
if any, or interest,  if any, on any Note and remaining  unclaimed for two years
after such principal,  and premium, if any, or interest, if any, have become due
and payable  shall be paid to the Company on its request or (if then held by the
Company) shall be discharged from such trust;  and the Holder of such Note shall
thereafter,  as an  unsecured  general  creditor,  look only to the  Company for
payment  thereof,  and all  liability  of the Trustee or such Paying  Agent with
respect  to such  trust  money,  and all  liability  of the  Company  as trustee
thereof,  shall thereupon  cease;  provided,  however,  that the Trustee or such
Paying  Agent,  before  being  required to make any such  repayment,  may at the
expense of the Company cause to be published once, in The New York Times and The
Wall Street Journal (national edition), notice that such money remains unclaimed
and that, after a date specified  therein,  which shall not be less than 30 days
from the date of such notification or publication, any unclaimed balance of such
money then remaining will be repaid to the Company.

SECTION 8.07.       REINSTATEMENT.

                  If the  Trustee or Paying  Agent is unable to apply any United
States dollars or non-callable  Government Securities in accordance with Section
8.02 or 8.03  hereof,  as the case may be, by reason of any order or judgment of
any  court  or  governmental  authority  enjoining,   restraining  or  otherwise
prohibiting   such   application,   then  the  Company's   and  the   Restricted
Subsidiaries'  obligations  under this  Indenture,  the Notes and the Subsidiary
Guarantees  shall be revived and  reinstated  as though no deposit had  occurred
pursuant to Section 8.02 or 8.03 hereof until such time as the Trustee or Paying
Agent is  permitted to apply all such money in  accordance  with Section 8.02 or
8.03 hereof, as the case may be; provided, however, that, if the Company and the
Restricted  Subsidiaries  make any payment of principal of, premium,  if any, or
interest,  if any, on any Note following the  reinstatement  of its obligations,
the Company and the Restricted Subsidiaries shall be subrogated to the rights of
the  Holders of such Notes to receive  such  payment  from the money held by the
Trustee or Paying Agent.


                                   ARTICLE 9.
                        AMENDMENT, SUPPLEMENT AND WAIVER

SECTION 9.01.       WITHOUT CONSENT OF HOLDERS OF NOTES.

                  Notwithstanding  Section 9.02 of this Indenture,  the Company,
the  Guarantors  and the Trustee may amend or supplement  this  Indenture or the
Notes without the consent of any Holder of a Note:

                  (a) to cure any ambiguity, defect or inconsistency;

                  (b) to provide for  uncertificated  Notes in addition to or in
         place of certificated Notes;

                                       62
<PAGE>

                  (c) to provide  for the  assumption  of the  Company's  or any
         Guarantor's  obligations  to the  Holders of the Notes in the case of a
         merger or consolidation  pursuant to Article Five or Article 11 hereof,
         as the case may be;

                  (d) to make any  change  that  would  provide  any  additional
         rights or benefits to the Holders of the Notes (including providing for
         additional  Subsidiary  Guarantees  pursuant to Section 4.13 hereof) or
         that does not materially adversely affect the legal rights hereunder of
         any Holder of the Note; or

                  (e) to comply with  requirements of the SEC in order to effect
         or maintain the qualification of this Indenture under the TIA.

                  Upon the request of the Company accompanied by a resolution of
its  Board  of  Directors  authorizing  the  execution  of any such  amended  or
supplemental  Indenture,  and  upon  receipt  by the  Trustee  of the  documents
described in Section 7.02  hereof,  the Trustee  shall join with the Company and
the  Guarantors  in the  execution  of any  amended  or  supplemental  Indenture
authorized  or permitted by the terms of this  Indenture and to make any further
appropriate  agreements and stipulations that may be therein contained,  but the
Trustee  shall not be  obligated  to enter  into such  amended  or  supplemental
Indenture that affects its own rights, duties or immunities under this Indenture
or otherwise.

SECTION 9.02.       WITH CONSENT OF HOLDERS OF NOTES.

                  Except as provided  below in this Section  9.02,  the Company,
the  Guarantors  and the Trustee may amend or supplement  this  Indenture or the
Notes with the consent of the Holders of at least a majority in principal amount
of the Notes then outstanding  (including consents obtained in connection with a
tender offer or exchange offer for the Notes), and, subject to Sections 6.04 and
6.07 hereof,  any existing  Default or Event of Default (other than a Default or
Event of Default  in the  payment  of the  principal  of,  premium,  if any,  or
interest on the Notes or Liquidated  Damages,  if any,  except a payment default
resulting from an  acceleration  that has been rescinded) or compliance with any
provision  of this  Indenture or the Notes may be waived with the consent of the
Holders  of a  majority  in  principal  amount  of the  then  outstanding  Notes
(including consents obtained in connection with a tender offer or exchange offer
for the Notes).

                  Upon the request of the Company accompanied by a resolution of
its  Board  of  Directors  authorizing  the  execution  of any such  amended  or
supplemental  Indenture,  and  upon the  filing  with the  Trustee  of  evidence
reasonably satisfactory to the Trustee of the consent of the Holders of Notes as
aforesaid, and upon receipt by the Trustee of the documents described in Section
7.02 hereof,  the Trustee shall join with the Company and the  Guarantors in the
execution  of such  amended or  supplemental  Indenture  unless such  amended or
supplemental  Indenture  affects the Trustee's own rights,  duties or immunities
under  this  Indenture  or  otherwise,  in  which  case the  Trustee  may in its
discretion,  but  shall  not  be  obligated  to,  enter  into  such  amended  or
supplemental Indenture.

                                       63
<PAGE>

                  It shall not be  necessary  for the  consent of the Holders of
Notes under this  Section  9.02 to approve the  particular  form of any proposed
amendment or waiver,  but it shall be  sufficient  if such consent  approves the
substance thereof.

                  After an  amendment,  supplement  or waiver under this Section
becomes effective, the Company shall mail to Holders of Notes affected thereby a
notice briefly  describing the amendment,  supplement or waiver.  Any failure of
the Company to mail such notice, or any defect therein,  shall not, however,  in
any way  impair or affect  the  validity  of any such  amended  or  supplemental
Indenture or waiver.  Subject to Sections 6.04 and 6.07 hereof, the Holders of a
majority in aggregate  principal  amount of the Notes then outstanding may waive
compliance  in a particular  instance by the Company or any  Guarantor  with any
provision of this Indenture,  the Notes or the Subsidiary  Guarantees.  However,
without the  consent of each Holder  affected,  an  amendment  or waiver may not
(with respect to any Notes held by a non-consenting Holder):

                  (a) reduce the  principal  amount of Notes whose  Holders must
         consent to an amendment, supplement or waiver;

                  (b) reduce the  principal  of or change the fixed  maturity of
         any Note or alter any of the provisions  with respect to the redemption
         of the Notes in a manner adverse to the Holders of the Notes;

                  (c)  reduce  the rate of or  change  the time for  payment  of
         interest, including default interest, on any Note;

                  (d) waive a Default  or Event of  Default  in the  payment  of
         principal of or premium,  if any, or interest or Liquidated Damages, if
         any, on the Notes (except a rescission of  acceleration of the Notes by
         the Holders of at least a majority in aggregate principal amount of the
         then  outstanding  Notes  and a  waiver  of the  payment  default  that
         resulted from such acceleration);

                  (e) make any Note  payable in money  other than that stated in
         the Notes;

                  (f)  make  any  change  in the  provisions  of this  Indenture
         relating to waivers of past  Defaults or the rights of Holders of Notes
         to receive payments of principal of or premium,  if any, or interest or
         Liquidated Damages, if any, on the Notes;

                  (g) waive a redemption payment with respect to any Note (other
         than a payment required by Section 4.10 or Section 4.14 hereof);

                  (h) except  pursuant  to Article 4,  Article 8 and  Article 11
         hereof, release any Guarantor from its obligations under its Subsidiary
         Guarantee,  or change any Subsidiary Guarantee in any manner that would
         materially adversely affect the Holders; or

                  (i) make any change in Section  6.04 or 6.07  hereof or in the
         foregoing amendment and waiver provisions.

                                       64
<PAGE>

SECTION 9.03.       COMPLIANCE WITH TRUST INDENTURE ACT.

                  Every  amendment or supplement to this  Indenture or the Notes
shall be set forth in a amended or supplemental Indenture that complies with the
TIA as then in effect.

SECTION 9.04.       REVOCATION AND EFFECT OF CONSENTS.

                  Until an amendment,  supplement or waiver becomes effective, a
consent to it by a Holder of a Note is a  continuing  consent by the Holder of a
Note and every  subsequent  Holder of a Note or portion of a Note that evidences
the same debt as the consenting  Holder's Note,  even if notation of the consent
is not made on any Note. However, any such Holder of a Note or subsequent Holder
of a Note may revoke the consent as to its Note if the Trustee  receives written
notice of revocation before the date the waiver, supplement or amendment becomes
effective.  An amendment,  supplement or waiver becomes  effective in accordance
with its terms and thereafter binds every Holder.

SECTION 9.05.       NOTATION ON OR EXCHANGE OF NOTES.

                  The  Trustee  may  place  an  appropriate  notation  about  an
amendment,  supplement  or  waiver  on any Note  thereafter  authenticated.  The
Company in exchange for all Notes may issue and the Trustee  shall  authenticate
new Notes (accompanied by a notation of the Subsidiary  Guarantees duly endorsed
by the  Restricted  Subsidiaries)  that  reflect the  amendment,  supplement  or
waiver.

                  Failure to make the  appropriate  notation or issue a new Note
shall not  affect  the  validity  and effect of such  amendment,  supplement  or
waiver.

SECTION 9.06.       TRUSTEE TO SIGN AMENDMENTS, ETC.

                  The Trustee shall sign any amended or  supplemental  Indenture
authorized pursuant to this Article Nine if the amendment or supplement does not
adversely affect the rights,  duties,  liabilities or immunities of the Trustee.
The  Company  and the  Guarantors  may not  sign an  amendment  or  supplemental
Indenture until the Board of Directors of the Company and each of the Guarantors
approves it. In executing  any amended or  supplemental  indenture,  the Trustee
shall be entitled to receive and (subject to Section 7.01 hereof) shall be fully
protected in relying  upon, an Officers'  Certificate  and an Opinion of Counsel
stating  that  the  execution  of such  amended  or  supplemental  indenture  is
authorized or permitted by this Indenture.


                                   ARTICLE 10.
                                  SUBORDINATION

SECTION 10.01.      AGREEMENT TO SUBORDINATE.

                  The  Company,  the Trustee and each Holder by accepting a Note
agrees,  that the  indebtedness  and obligations  evidenced by the Note (a) rank
pari passu with the 1996 Notes,  (b) rank pari passu with the 1997 Notes and (c)
are  subordinated in right of payment,  to the extent 

                                       65
<PAGE>

and in the manner  provided in this  Article,  to the prior  payment in full, in
cash,  of all  Obligations  with respect to Senior Debt of the Company  (whether
outstanding  on the date  hereof or  hereafter  created,  incurred,  assumed  or
guaranteed),  and that the  subordination  is for the  benefit of the holders of
Senior Debt of the Company.

SECTION 10.02.      LIQUIDATION; DISSOLUTION; BANKRUPTCY.

                  Upon any payment or  distribution  to creditors of the Company
in  a  liquidation   or   dissolution   of  the  Company  or  in  a  bankruptcy,
reorganization,  insolvency,  receivership or similar proceeding relating to the
Company or its property,  in an  assignment  for the benefit of creditors or any
marshaling of the Company's assets and liabilities:

                           (1) holders of Senior  Debt of the  Company  shall be
                  entitled to receive payment in full in cash of all Obligations
                  due in respect of such Senior  Debt of the Company  (including
                  interest after the  commencement of any such proceeding at the
                  rate specified in the  applicable  Senior Debt of the Company,
                  whether or not allowed as a claim in such  proceeding)  before
                  Holders   shall  be   entitled   to  receive  any  payment  or
                  distribution from the Company with respect to the Notes; and

                           (2) until all Obligations with respect to Senior Debt
                  of the Company (as provided in subsection  (1) above) are paid
                  in full in cash,  any  payment  or  distribution  to which the
                  Trustee or any Holder  would be entitled  but for this Article
                  shall be made to holders  of Senior  Debt of the  Company,  as
                  their interests may appear.

SECTION 10.03.      DEFAULT ON DESIGNATED SENIOR DEBT.

                  The Company may not make any payment or  distribution  upon or
in respect of the Notes,  including,  without  limitation,  by way of set-off or
otherwise,  or redeem (or make a deposit in redemption  of),  defease or acquire
any of the Notes, for cash, properties or securities if:

                  (i) a default in the  payment of any  principal,  premium,  if
         any, or  interest  or other  Obligations  (a  "Payment  Default")  with
         respect to Senior Debt of the Company occurs and is continuing; or

                  (ii) a default  (other  than a Payment  Default)  or any event
         that,  after  notice or  passage  of time  would  become a  default  (a
         "Non-Monetary  Default"),  on Senior Debt of the Company  occurs and is
         continuing  that then permits holders of the Senior Debt of the Company
         to  accelerate  its maturity  and the Trustee  receives a notice of the
         default (a  "Payment  Blockage  Notice")  from a Person who may give it
         pursuant to Section 10.11 hereof.  Any number of such Payment  Blockage
         Notices  may be given,  provided,  however,  that (i) not more than one
         Payment  Blockage  Notice  may be  commenced  during  any period of 360
         consecutive days and (ii) any Non-Monetary  Default that existed or was
         continuing  on the date of  delivery  of any such notice to the Trustee
         (to the extent the holder of Designated Senior Debt, or such trustee or
         agent,  giving such Payment  

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         Blockage Notice had knowledge of the same) shall not be the basis for a
         subsequent Payment Blockage Notice,  unless such default has been cured
         or waived for a period of not less than 90 days.

                  The Company may and shall resume payments on and distributions
in  respect  of the Notes and all  Obligations  with  respect  thereto,  and may
acquire such Notes or Obligations upon the earlier of:

                           (1) in the case of a payment  default,  the date upon
                  which such default is cured or waived, or

                           (2) in the  case of a  Non-Monetary  Default,  on the
                  earlier  of the date on which  such  Non-Monetary  Default  is
                  cured or  waived  or 179  days  after  the  date on which  the
                  applicable  Payment  Blockage  Notice  is  received,   if  the
                  maturity  of such  Senior  Debt of the  Company  has not  been
                  accelerated,

if this Article 10 otherwise permits the payment, distribution or acquisition at
the time thereof.

SECTION 10.04.      ACCELERATION OF NOTES.

                  If payment of the Notes is accelerated  because of an Event of
Default,  the Company shall promptly  notify  Representatives  of the holders of
Senior Debt of the Company of the acceleration.

SECTION 10.05.      WHEN DISTRIBUTION MUST BE PAID OVER.

                  In the event that the Trustee or any Holder  receives from the
Company any payment of any Obligations  with respect to the Notes at a time when
the  Trustee or such  Holder,  as  applicable,  has actual  knowledge  that such
payment is prohibited  by Section  10.02 or 10.03 hereof,  such payment shall be
held by the  Trustee or such  Holder in trust for the  benefit  of, and shall be
paid forthwith over and delivered upon written request to, the holders of Senior
Debt of the Company,  as their  interests  may appear,  or their  Representative
under the indenture or other agreement (if any) pursuant to which Senior Debt of
the Company may have been issued, as their respective  interests may appear, for
application to the payment of all Obligations with respect to Senior Debt of the
Company remaining unpaid to the extent necessary to pay such Obligations in full
in accordance with their terms, after giving effect to any concurrent payment or
distribution to or for the holders of Senior Debt of the Company.

                  With respect to the holders of Senior Debt of the Company, the
Trustee  undertakes to perform only such  obligations on the part of the Trustee
as are  specifically  set forth in this Article 10, and no implied  covenants or
obligations  with respect to the holders of Senior Debt of the Company  shall be
read into this Indenture against the Trustee. The Trustee shall not be deemed to
owe any fiduciary  duty to the holders of Senior Debt of the Company,  and shall
not be liable to any such holders if the Trustee shall pay over or distribute to
or on behalf of Holders or the  Company or any other  Person  money or assets to
which any holders of Senior  Debt of the 

                                       67
<PAGE>

Company  shall be entitled by virtue of this Article 10,  except if such payment
is made as a  result  of the  willful  misconduct  or  gross  negligence  of the
Trustee.

SECTION 10.06.      NOTICE BY COMPANY.

                  The Company shall  promptly  notify the Trustee and the Paying
Agent of any facts  known to the  Company  that  would  cause a  payment  of any
Obligations  with respect to the Notes to violate this  Article,  but failure to
give such notice shall not affect the  subordination  of the Notes to the Senior
Debt of the Company as provided in this Article.

SECTION 10.07.      SUBROGATION.

                  After all  Obligations  with  respect  to  Senior  Debt of the
Company are paid in full, in cash, and until the Notes are paid in full, Holders
shall be subrogated  (equally and ratably with all other Indebtedness pari passu
with the  Notes) to the  rights of  holders  of Senior  Debt of the  Company  to
receive  distributions  applicable  to Senior  Debt of the Company to the extent
that  distributions  otherwise  payable to the Holders  have been applied to the
payment of Senior Debt of the Company. A distribution made under this Article to
holders of Senior Debt of the  Company  that  otherwise  would have been made to
Holders is not, as between the Company and Holders,  a payment by the Company on
the Notes.

SECTION 10.08.      RELATIVE RIGHTS.

                  This  Article  defines  the  relative  rights of  Holders  and
holders of Senior Debt of the Company. Nothing in this Indenture shall:

                           (1) impair,  as between the Company and Holders,  the
                  obligation   of   the   Company,   which   is   absolute   and
                  unconditional,  to pay  principal of and interest on the Notes
                  in accordance with their terms;

                           (2)  affect  the  relative   rights  of  Holders  and
                  creditors  of the Company  other than their rights in relation
                  to holders of Senior Debt of the Company; or

                           (3) prevent the Trustee or any Holder from exercising
                  its  available  remedies  upon a Default or Event of  Default,
                  subject to the rights of holders  and owners of Senior Debt of
                  the Company to receive  distributions  and payments  otherwise
                  payable to Holders.

                  If  the  Company  fails  because  of  this  Article  10 to pay
principal  of,  premium or  interest  on a Note on the due date,  the failure is
still a Default or Event of Default.

SECTION 10.09.      SUBORDINATION MAY NOT BE IMPAIRED BY COMPANY.

                  No  right of any  holder  of  Senior  Debt of the  Company  to
enforce the  subordination of the  Indebtedness  evidenced by the Notes shall be
impaired  by any act or  failure  to act by the  Company or any Holder or by the
failure of the Company or any Holder to comply with this Indenture.

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SECTION 10.10.      DISTRIBUTION OR NOTICE TO REPRESENTATIVE.

                  Whenever  a  distribution  is to be made or a notice  given to
holders of Senior  Debt of the  Company,  the  distribution  may be made and the
notice given to their Representative.

                  Upon any  payment  or  distribution  of assets of the  Company
referred to in this Article 10, the Trustee and the Holders shall be entitled to
rely upon any order or decree  made by any court of  competent  jurisdiction  or
upon any certificate of such  Representative  or of the  liquidating  trustee or
agent or other Person making any  distribution  to the Trustee or to the Holders
for the purpose of  ascertaining  the Persons  entitled to  participate  in such
distribution,  the  holders  of  the  Senior  Debt  of  the  Company  and  other
Indebtedness of the Company,  the amount or amounts thereof or payable  thereon,
the amount or amounts paid or distributed  thereon and all other facts pertinent
thereto or to this Article 10.

SECTION 10.11.      RIGHTS OF TRUSTEE AND PAYING AGENT.

                  Notwithstanding the provisions of this Article 10 or any other
provision of this Indenture,  the Trustee shall not be charged with knowledge of
the  existence  of any facts that would  prohibit  the making of any  payment or
distribution  by the Trustee,  and the Trustee and the Paying Agent may continue
to make  payments on the Notes,  unless the Trustee  shall have  received at its
Corporate  Trust  Office  at least  one  Business  Day prior to the date of such
payment a Payment Blockage  Notice.  Only the holders or the  Representative  of
holders of  Designated  Senior Debt of the  Company may give a Payment  Blockage
Notice.  Nothing in this  Article 10 shall impair the claims of, or payments to,
the Trustee under or pursuant to Section 7.07 hereof.

                  The Trustee in its  individual or any other  capacity may hold
Senior  Debt of the  Company  with the same  rights it would have if it were not
Trustee. Any Agent may do the same with like rights.

SECTION 10.12.      AUTHORIZATION TO EFFECT SUBORDINATION.

                  Each  Holder  of a Note  by the  Holder's  acceptance  thereof
authorizes and directs the Trustee on the Holder's behalf to take such action as
may be necessary or appropriate to effectuate the  subordination  as provided in
this   Article  10,  and   appoints   the   Trustee  to  act  as  the   Holder's
attorney-in-fact  for any and all such purposes.  If the Trustee does not file a
proper  proof of claim or proof of debt in the form  required in any  proceeding
referred to in Section 6.09 hereof at least 30 days before the expiration of the
time to file such claim, the  Representatives  of the Senior Debt of the Company
are  hereby  authorized  to file an  appropriate  claim for and on behalf of the
Holders of the Notes.

SECTION 10.13.      AMENDMENTS.

                  The  provisions  of this  Article  10 shall not be  amended or
modified  without the  written  consent of the holders of all Senior Debt of the
Company.


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                                   ARTICLE 11.
                              SUBSIDIARY GUARANTEES

SECTION 11.01.      SUBSIDIARY GUARANTEE.

                  Each Subsidiary that is a signatory hereto and each Restricted
Subsidiary  of the  Company  which in  accordance  with  Section  4.13 hereof is
required to guarantee the  obligations  of the Company under the Notes (each,  a
"Guarantor"),  upon  execution of a supplemental  indenture,  hereby jointly and
severally unconditionally  guarantees to each Holder of a Note authenticated and
delivered by the Trustee  irrespective of the validity or enforceability of this
Indenture,  the Notes or the  obligations of the Company under this Indenture or
the Notes, that: (i) the principal of and interest on and Liquidated Damages, if
any,  with  respect to the Notes  will be paid in full when due,  whether at the
maturity or interest payment or mandatory redemption date, by acceleration, call
for  redemption  or  otherwise,  and  interest on the overdue  principal  of and
interest,  if any, on the Notes and all other  obligations of the Company to the
Holders or the Trustee  under this  Indenture or the Notes will be promptly paid
in full or performed, all in accordance with the terms of this Indenture and the
Notes;  and (ii) in case of any  extension  of time of payment or renewal of any
Notes or any of such  other  obligations,  they will be paid in full when due or
performed in accordance  with the terms of the extension or renewal,  whether at
maturity,  by acceleration or otherwise.  Failing payment when due of any amount
so guaranteed for whatever  reason,  each Guarantor will be obligated to pay the
same  whether or not such  failure  to pay has become an Event of Default  which
could cause acceleration  pursuant to Section 6.02 hereof. Each Guarantor agrees
that this is a guarantee of payment not a guarantee of collection.

                  Each Guarantor  hereby agrees that its obligations with regard
to this  Subsidiary  Guarantee  shall be joint and  several  and  unconditional,
irrespective of the validity or  enforceability  of the Notes or the obligations
of the Company  under this  Indenture,  the absence of any action to enforce the
same, the recovery of any judgment against the Company or any other obligor with
respect to this  Indenture,  the Notes or the  obligations  of the Company under
this  Indenture  or the  Notes,  any  action  to  enforce  the same or any other
circumstances (other than complete performance) which might otherwise constitute
a legal or  equitable  discharge  or  defense  of a  Guarantor.  Each  Guarantor
further,  to the extent  permitted by law, waives and  relinquishes  all claims,
rights and remedies  accorded by applicable  law to guarantors and agrees not to
assert or take advantage of any such claims,  rights or remedies,  including but
not limited to: (a) any right to require the Trustee, the Holders or the Company
(each, a "Benefited  Party") to proceed  against the Company or any other Person
or to proceed  against or exhaust any security held by a Benefited  Party at any
time or to  pursue  any other  remedy  in any  Benefited  Party's  power  before
proceeding against such Guarantor; (b) the defense of the statute of limitations
in any action  hereunder or in any action for the collection of any Indebtedness
or the performance of any obligation hereby guaranteed; (c) any defense that may
arise by reason of the incapacity, lack of authority, death or disability of any
other  Person or the  failure  of a  Benefited  Party to file or enforce a claim
against the estate (in  administration,  bankruptcy or any other  proceeding) of
any other Person;  (d) demand,  protest and notice of any kind including but not
limited  to  notice  of the  existence,  creation  or  incurring  of any  new or
additional Indebtedness or obligation or of any action or non-action on the part
of such  Guarantor,  the  Company,  any  Benefited  Party,  any 

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<PAGE>

creditor  of such  Guarantor,  the  Company  or on the part of any other  Person
whomsoever in connection with any Indebtedness or obligations hereby guaranteed;
(e) any  defense  based upon an  election  of  remedies  by a  Benefited  Party,
including but not limited to an election to proceed  against such  Guarantor for
reimbursement;  (f) any  defense  based  upon any  statute  or rule of law which
provides that the obligation of a surety must be neither larger in amount nor in
other  respects  more  burdensome  than that of the  principal;  (g) any defense
arising because of a Benefited  Party's election,  in any proceeding  instituted
under Bankruptcy Law, of the application of 11 U.S.C. Section 1111(b)(2); or (h)
any defense  based on any  borrowing  or grant of a security  interest  under 11
U.S.C.  Section  364.  Each  Guarantor  hereby  covenants  that  its  Subsidiary
Guarantee  will  not  be  discharged  except  by  complete  performance  of  the
obligations contained in its Subsidiary Guarantee and this Indenture.

                  If any  Holder  or the  Trustee  is  required  by any court or
otherwise  to return to either the Company or any  Guarantor,  or any  Custodian
acting in relation to either the Company or such  Guarantor,  any amount paid by
the Company or such  Guarantor  to the Trustee or such  Holder,  the  applicable
Subsidiary Guarantees, to the extent theretofore discharged, shall be reinstated
and be in full  force and  effect.  Each  Guarantor  agrees  that it will not be
entitled  to any right of  subrogation  in relation to the Holders in respect of
any  obligations  guaranteed  hereby  until  payment in full of all  obligations
guaranteed hereby.

                  Each Guarantor further agrees that, as between such Guarantor,
on the one hand,  and the Holders and the  Trustee,  on the other hand,  (i) the
maturity of the obligations  guaranteed hereby may be accelerated as provided in
Section   6.02   hereof  for  the   purposes  of  this   Subsidiary   Guarantee,
notwithstanding  any  stay,  injunction  or other  prohibition  preventing  such
acceleration  as to the  Company  or any  other  obligor  on  the  Notes  of the
obligations  guaranteed  hereby,  and (ii) in the  event of any  declaration  of
acceleration  of those  obligations  as provided in Section 6.02  hereof,  those
obligations  (whether  or not due and  payable)  will  forthwith  become due and
payable by such Guarantor for the purpose of this Subsidiary Guarantee.

SECTION 11.02.      SUBORDINATION.

                  Each  Guarantor,  the Trustee,  and each Holder by accepting a
Note  agrees,  that  the  indebtedness  and  obligations  under  the  Subsidiary
Guarantees  (a) rank pari passu with the  guarantees of the 1996 Notes  provided
under the 1996  Indenture,  (b) rank pari passu with the  guarantees of the 1997
Notes  provided under the 1997  Indenture and (c) are  subordinated  in right of
payment,  to the extent and in the manner  provided  in this  Article 11, to the
prior payment in full, in cash, of all  Obligations  with respect to Senior Debt
of such Guarantor (whether  outstanding on the date hereof or hereafter created,
incurred, assumed or guaranteed),  and that the subordination is for the benefit
of the holders of Senior Debt of such Guarantor.

SECTION 11.03.      LIQUIDATION; DISSOLUTION; BANKRUPTCY.

                  Upon any payment or distribution to creditors of any Guarantor
in  a  liquidation  or  dissolution  of  such  Guarantor  or  in  a  bankruptcy,
reorganization,  insolvency, receivership or similar proceeding relating to such
Guarantor or its property,  in an assignment for the benefit of creditors or any
marshaling of such Guarantor's assets and liabilities:

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<PAGE>

                           (1) holders of Senior Debt of such Guarantor shall be
                  entitled to receive payment in full in cash of all Obligations
                  due  in  respect  of  such  Senior  Debt  of  such   Guarantor
                  (including   interest  after  the  commencement  of  any  such
                  proceeding at the rate specified in the applicable Senior Debt
                  of such  Guarantor,  whether or not allowed as a claim in such
                  proceeding)  before the  Holders  shall be entitled to receive
                  any payment or distribution from the Guarantor with respect to
                  such Guarantor's Subsidiary Guarantee; and

                           (2) until all Obligations with respect to Senior Debt
                  of such  Guarantor (as provided in  subsection  (1) above) are
                  paid in full in cash, any payment or distribution to which the
                  Trustee or any Holder  would be entitled  but for this Article
                  shall be made to holders of Senior Debt of such Guarantor,  as
                  their interests may appear.

SECTION 11.04.      DEFAULT ON SENIOR DEBT OF THE GUARANTOR.

                  No Guarantor shall make any payment or distribution upon or in
respect of the Notes or its Subsidiary Guarantee, including, without limitation,
by way of set-off or otherwise,  or redeem (or make a deposit in redemption of),
defease or acquire any of the Notes, for cash, properties or securities if:

                  (i) a Payment  Default  with  respect  to Senior  Debt of such
         Guarantor occurs and is continuing; or

                  (ii) a  Non-Monetary  Default on Senior Debt of such Guarantor
         occurs and is continuing  that then permits  holders of the Senior Debt
         of such Guarantor to accelerate its maturity and the Trustee receives a
         Payment  Blockage  Notice  from a Person  who may give it  pursuant  to
         Section 11.12 hereof.  Any number of such Payment  Blockage Notices may
         be  given,  provided,  however,  that  (i) not more  than  one  Payment
         Blockage  Notice may be commenced  during any period of 360 consecutive
         days and (ii) any  default  or event of  default  that  existed  or was
         continuing  on the date of delivery of any Payment  Blockage  Notice to
         the Trustee (to the extent the holder of  Designated  Senior  Debt,  or
         such  trustee  or  agent,  giving  such  Payment  Blockage  Notice  had
         knowledge of the same) shall not be the basis for a subsequent  Payment
         Blockage Notice  pursuant to Section 11.12 herein,  unless such default
         has been cured or waived  for a period of not less than 90  consecutive
         days.

                  Each   Guarantor   may  and  shall  resume   payments  on  and
distributions  in  respect  of its  Subsidiary  Guarantee,  the  Notes  and  all
Obligations with respect thereto, and may acquire such Notes or Obligations upon
the earlier of:

                           (1) in the case of a payment  default,  the date upon
                  which such default is cured or waived, or

                           (2) in the  case of a  Non-Monetary  Default,  on the
                  earlier  of the date on which  such  Non-Monetary  Default  is
                  cured or  waived  or 179  days  after  the  date 

                                       72
<PAGE>

                  on which the applicable  Payment  Blockage Notice is received,
                  if the maturity of such Senior Debt of such  Guarantor has not
                  been accelerated,

if this Article 11 otherwise permits the payment, distribution or acquisition at
the time thereof.

SECTION 11.05.      ACCELERATION OF NOTES.

                  If payment of the Notes is accelerated  because of an Event of
Default,  each Guarantor shall promptly notify the Representative of the holders
of Senior Debt of such Guarantor of the acceleration.

SECTION 11.06.      WHEN DISTRIBUTION MUST BE PAID OVER.

                  In the event that the  Trustee or any Holder  receives  from a
Guarantor  any  payment  of any  Obligations  with  respect  to the Notes or the
Subsidiary  Guarantees at a time when the Trustee or such Holder, as applicable,
has actual  knowledge  that such payment is prohibited by Section 11.03 or 11.04
hereof,  such payment shall be held by the Trustee or such Holder,  in trust for
the benefit of, and shall be paid  forthwith  over and  delivered  upon  written
request to, the holders of Senior Debt of such Guarantor, as their interests may
appear, or their  Representative under the indenture or other agreement (if any)
pursuant to which Senior Debt of such  Guarantor may have been issued,  as their
respective  interests  may  appear,  for  application  to  the  payment  of  all
Obligations  with respect to Senior Debt of such Guarantor  remaining  unpaid to
the extent  necessary to pay such  Obligations in full in accordance  with their
terms,  after giving effect to any concurrent  payment or distribution to or for
the holders of Senior Debt of such Guarantor.

                  With  respect to the holders of Senior Debt of any  Guarantor,
the  Trustee  undertakes  to perform  only such  obligations  on the part of the
Trustee  as are  specifically  set  forth in this  Article  11,  and no  implied
covenants  or  obligations  with  respect to the  holders of Senior Debt of such
Guarantor  shall be read into this  Indenture  against the Trustee.  The Trustee
shall not be deemed to owe any  fiduciary  duty to the holders of Senior Debt of
such Guarantor, and shall not be liable to any such holders if the Trustee shall
pay over or  distribute  to or on behalf of Holders or the  Company or any other
Person  money or assets to which any  holders of Senior  Debt of such  Guarantor
shall be entitled by virtue of this  Article 11,  except if such payment is made
as a result of the willful misconduct or gross negligence of the Trustee.

SECTION 11.07.      NOTICE BY A GUARANTOR.

                  Each  Guarantor  shall  promptly  notify the  Trustee  and the
Paying Agent of any facts known to such  Guarantor that would cause a payment of
any Obligations with respect to the Notes or its Subsidiary Guarantee to violate
this Article, but failure to give such notice shall not affect the subordination
of its Subsidiary Guarantee or of the Notes to the Senior Debt of such Guarantor
as provided in this Article 11.

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<PAGE>

SECTION 11.08.      SUBROGATION.

                  With  respect to any  Guarantor,  after all  Obligations  with
respect to Senior Debt of such Guarantor is paid in full, in cash, and until the
Notes are paid in full,  Holders shall be  subrogated  (equally and ratably with
all other Indebtedness pari passu with such Guarantor's Subsidiary Guarantee) to
the rights of holders of Senior Debt of such Guarantor to receive  distributions
applicable  to Senior Debt of such  Guarantor  to the extent that  distributions
otherwise payable to the Holders have been applied to the payment of Senior Debt
of such Guarantor.  A distribution  made under this Article to holders of Senior
Debt of such Guarantor that otherwise would have been made to Holders is not, as
between such Guarantor and Holders,  a payment by such Guarantor on the Notes or
the Subsidiary Guarantee.

SECTION 11.09.      RELATIVE RIGHTS.

                  This  Article  defines  the  relative  rights of  Holders  and
holders of Senior Debt of each Guarantor. Nothing in this Indenture shall:

                           (1)  impair,   as  between  such  Guarantor  and  the
                  Holders,  the obligation of such Guarantor,  which is absolute
                  and  unconditional,  to  pay  principal  of and  interest  and
                  Liquidated  Damages,  if any, on the Notes in accordance  with
                  the terms of its Subsidiary Guarantee;

                           (2)  affect  the  relative   rights  of  Holders  and
                  creditors  of  such  Guarantor  other  than  their  rights  in
                  relation to holders of Senior Debt of such Guarantor; or

                           (3) prevent the Trustee or any Holder from exercising
                  its  available  remedies  upon a Default or Event of  Default,
                  subject  to the  rights  of  holders  of  Senior  Debt of such
                  Guarantor  set  forth  herein  to  receive  distributions  and
                  payments otherwise payable to Holders.

                  If any  Guarantor  fails  because  of this  Article  11 to pay
principal of,  premium or interest or Liquidated  Damages,  if any, on a Note on
the due date, the failure is still a Default or Event of Default.

SECTION 11.10.      SUBORDINATION MAY NOT BE IMPAIRED BY ANY GUARANTOR.

                  With  respect  to any  Guarantor,  no right of any  holder  of
Senior Debt of such Guarantor to enforce the  subordination  of the Indebtedness
evidenced by the Subsidiary Guarantee shall be impaired by any act or failure to
act by such  Guarantor  or any  Holder or by failure  of such  Guarantor  or any
Holder to comply with this Indenture.

SECTION 11.11.      DISTRIBUTION OR NOTICE TO REPRESENTATIVE.

                  With respect to any Guarantor,  whenever a distribution  is to
be made or a notice  given to  holders  of Senior  Debt of such  Guarantor,  the
distribution may be made and the notice given to their Representative.

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<PAGE>

                  Upon any payment or  distribution  of assets of any  Guarantor
referred to in this Article 11, the Trustee and the Holders shall be entitled to
rely upon any order or decree  made by any court of  competent  jurisdiction  or
upon any certificate of such  Representative  or of the  liquidating  trustee or
agent or other Person making any  distribution  to the Trustee or to the Holders
for the purpose of  ascertaining  the Persons  entitled to  participate  in such
distribution,  the  holders  of the  Senior  Debt of such  Guarantor  and  other
Indebtedness  of such  Guarantor,  the  amount or  amounts  thereof  or  payable
thereon,  the amount or amounts paid or distributed  thereon and all other facts
pertinent thereto or to this Article 11.

SECTION 11.12.      RIGHTS OF TRUSTEE AND PAYING AGENT.

                  Notwithstanding the provisions of this Article 11 or any other
provision of this Indenture,  the Trustee shall not be charged with knowledge of
the  existence  of any facts that would  prohibit  the making of any  payment or
distribution  by the Trustee,  and the Trustee and the Paying Agent may continue
to make  payments on the Notes,  unless the Trustee  shall have  received at its
Corporate  Trust  Office  at least  one  Business  Day prior to the date of such
payment a  Payment  Blockage  Notice.  Only the  Representative  of  holders  of
Designated  Senior  Debt may give a Payment  Blockage  Notice.  Nothing  in this
Article 11 shall  impair the claims of, or  payments  to, the  Trustee  under or
pursuant to Section 7.07 hereof.

                  With respect to any  Guarantor,  the Trustee in its individual
or any other  capacity  may hold  Senior  Debt of such  Guarantor  with the same
rights it would have if it were not Trustee. Any Agent may do the same with like
rights.

SECTION 11.13.      AUTHORIZATION TO EFFECT SUBORDINATION.

                  Each  Holder  of a Note  by the  Holder's  acceptance  thereof
authorizes and directs the Trustee on the Holder's behalf to take such action as
may be necessary or appropriate to effectuate the  subordination  as provided in
this   Article  11,  and   appoints   the   Trustee  to  act  as  the   Holder's
attorney-in-fact  for any and all such purposes.  If the Trustee does not file a
proper  proof of claim or proof of debt in the form  required in any  proceeding
relative to any  Guarantor  referred to in Section  6.09 hereof at least 30 days
before the  expiration of the time to file such claim,  the  Representatives  of
Senior Debt of such Guarantor are hereby authorized to file an appropriate claim
for and on behalf of the Holders of the Notes.

SECTION 11.14.      AMENDMENTS.

                  With respect to any Guarantor, the provisions of Section 11.02
through  11.14  hereof  shall not be amended or  modified  without  the  written
consent of the holders of all Senior Debt of such Guarantor.

SECTION 11.15.      LIMITATION OF GUARANTOR'S LIABILITY.

                  Each Guarantor and, by its acceptance  hereof, the Trustee and
each  Holder  hereby  confirm  that  it is its  intention  that  the  Subsidiary
Guarantee of such Guarantor not  constitute a fraudulent  transfer or conveyance
for purposes of the Bankruptcy Law, the Uniform  Fraudulent  

                                       75
<PAGE>

Conveyance  Act, the Uniform  Fraudulent  Transfer Act or any similar federal or
state law to the extent  applicable to any Subsidiary  Guarantee.  To effectuate
the foregoing  intention,  each such person hereby  irrevocably  agrees that the
obligation of such Guarantor  under its Subsidiary  Guarantee under this Article
11 shall be limited to the maximum  amount as will,  after giving effect to such
maximum amount and all other (contingent or other) liabilities of such Guarantor
that are relevant  under such laws,  and after giving effect to any  collections
from,  rights to receive  contribution  from or payments made by or on behalf of
any other  Guarantor in respect of the obligations of such other Guarantor under
this Article 11, result in the  obligations of such Guarantor in respect of such
maximum amount not  constituting a fraudulent  transfer or conveyance under said
laws. The Trustee and each Holder by accepting the benefits hereof, confirms its
intention  that, in the event of a bankruptcy,  reorganization  or other similar
proceeding of the Company or any Guarantor in which  concurrent  claims are made
upon such  Guarantor  hereunder,  to the extent  such  claims  will not be fully
satisfied,  each such  claimant  with a valid claim against the Company shall be
entitled to a ratable share of all payments by such Guarantor in respect of such
concurrent claims. For all purposes of this Section 11.15,  Senior Debt shall be
deemed to have been  incurred  prior to the  incurrence  of the  obligations  in
respect of the Subsidiary Guarantees.

SECTION 11.16.      RESTRICTED SUBSIDIARIES MAY  CONSOLIDATE, ETC.,  ON  CERTAIN
                    TERMS.

                  No  Guarantor  shall  consolidate  with or merge  with or into
(whether or not such Guarantor is the surviving Person),  another Person whether
or not it is affiliated with such Guarantor unless (i) subject to the provisions
of  Section  11.17   hereof,   the  Person  formed  by  or  surviving  any  such
consolidation  or  merger  (if  other  than  such  Guarantor)  assumes  all  the
obligations  of such  Guarantor  pursuant to a  supplemental  indenture  in form
reasonably  satisfactory  to the Trustee,  under its Subsidiary  Guarantee,  the
Notes  and  this  Indenture,  (ii)  immediately  after  giving  effect  to  such
transaction, no Default or Event of Default exists, and (iii) such Guarantor, or
any Person  formed by or surviving  any such  consolidation  or merger,  will be
permitted to incur,  immediately  after giving  effect to such  transaction,  at
least  $1.00 of  additional  Indebtedness  pursuant  to the first  paragraph  of
Section  4.09  hereof.  In  case  of any  such  consolidation,  merger,  sale or
conveyance and upon the assumption by the successor corporation, by supplemental
indenture, executed and delivered to the Trustee and satisfactory in form to the
Trustee, of the Subsidiary  Guarantee in this Indenture and the due and punctual
performance  and  observance  of all of the  covenants  and  conditions  of this
Indenture to be performed by the  Guarantor,  such successor  corporation  shall
succeed to and be  substituted  for the Guarantor  with the same effect as if it
had been named herein as a Guarantor.

SECTION 11.17.      RELEASES  FOLLOWING  SALE  OF  ASSETS  OR   DESIGNATION   AS
                    UNRESTRICTED SUBSIDIARY.

                  In the  event  of (a) a sale or  other  disposition  of all or
substantially   all  of  the  assets  of  any  Guarantor,   by  way  of  merger,
consolidation  or otherwise,  or (b) a sale or other  disposition  of all of the
capital  stock  of  any  Guarantor,  or  (c)  the  designation  of a  Restricted
Subsidiary as an Unrestricted Subsidiary in accordance with the terms of Section
4.17 hereof,  then such Guarantor (in the event of a sale or other  disposition,
by way of such a merger, consolidation or otherwise, 

                                       76
<PAGE>

of  all of  the  capital  stock  of  such  Guarantor,  or in  the  event  of the
designation of such Guarantor as an Unrestricted  Subsidiary) or the corporation
acquiring  the property (in the event of a sale or other  disposition  of all or
substantially  all of the  assets  of such  Guarantor)  shall  be  released  and
relieved of its obligations  under its Subsidiary  Guarantee;  provided that the
Net Proceeds of such sale or other  disposition  are applied in accordance  with
Section 4.10 hereof.


                                   ARTICLE 12.
                                  MISCELLANEOUS

SECTION 12.01.      TRUST INDENTURE ACT CONTROLS.

                  If any  provision  of  this  Indenture  limits,  qualifies  or
conflicts  with the duties  imposed by TIA  ss.318(c),  the imposed duties shall
control.

SECTION 12.02.      NOTICES.

                  Any notice or communication  by the Company,  any Guarantor or
the Trustee to the others is duly given if in writing and delivered in Person or
mailed by first class mail (registered or certified,  return receipt requested),
telecopier  or overnight  air courier  guaranteeing  next day  delivery,  to the
others' address:

                  If to the Company or any Guarantor:

                           Iron Mountain Incorporated
                           745 Atlantic Avenue
                           Boston, MA 02111
                           Attention:  President
                           Telecopier No.:  (617) 350-7881

                  With a copy to:

                           Sullivan & Worcester LLP
                           One Post Office Square
                           Boston, MA  02109
                           Telecopier No.:  (617) 338-2880
                           Attention: William J. Curry, Esq.

                  If to the Trustee:

                           The Bank of New York
                           101 Barclay Street
                           21st Floor
                           New York, NY  10286
                           Telecopier No.:  (212) 815-5915
                           Attention:  Corporate Trust Trustee Administration

                                       77
<PAGE>

                  The Company,  any  Guarantor or the Trustee,  by notice to the
others may designate additional or different addresses for subsequent notices or
communications.

                  All  notices  and  communications  (other  than  those sent to
Holders) shall be deemed to have been duly given: at the time delivered by hand,
if personally  delivered;  five Business Days after being deposited in the mail,
postage prepaid, if mailed; when receipt  acknowledged,  if telecopied;  and the
next Business Day after timely delivery to the courier, if sent by overnight air
courier guaranteeing next day delivery.

                  Any  notice or  communication  to a Holder  shall be mailed by
first class mail, or by overnight air courier  guaranteeing next day delivery to
its  address  shown  on the  register  kept  by the  Registrar.  Any  notice  or
communication shall also be so mailed to any Person described in TIA ss. 313(c),
to the extent required by the TIA.  Failure to mail a notice or communication to
a Holder or any defect in it shall not affect its  sufficiency  with  respect to
other Holders.

                  If a notice or  communication is mailed in the manner provided
above within the time prescribed, it is duly given, whether or not the addressee
receives it.

                  If  the   Company   or  any   Guarantor   mails  a  notice  or
communication to Holders,  it shall mail a copy to the Trustee and each Agent at
the same time.

SECTION 12.03.      COMMUNICATION  BY  HOLDERS  OF  NOTES  WITH OTHER HOLDERS OF
                    NOTES.

                  Holders may communicate  pursuant to TIA ss. 312(b) with other
Holders  with respect to their  rights  under this  Indenture or the Notes.  The
Company, the Restricted Subsidiaries, the Trustee, the Registrar and anyone else
shall have the protection of TIA ss. 312(c).

SECTION 12.04.      CERTIFICATE AND OPINION AS TO CONDITIONS PRECEDENT.

                  Upon  any  request  or  application  by  the  Company  or  any
Guarantor to the Trustee to take any action under this Indenture, the Company or
such Guarantor shall furnish to the Trustee:

                  (a) an Officers'  Certificate in form and substance reasonably
         satisfactory  to the Trustee  (which shall include the  statements  set
         forth in Section  12.05  hereof)  stating  that,  in the opinion of the
         signers,  all conditions  precedent and covenants  provided for in this
         Indenture relating to the proposed action have been satisfied; and

                  (b) an Opinion of  Counsel  in form and  substance  reasonably
         satisfactory  to the Trustee  (which shall include the  statements  set
         forth in Section  12.05  hereof)  stating  that, in the opinion of such
         counsel,   all  such  conditions  precedent  and  covenants  have  been
         satisfied.

                                       78
<PAGE>

SECTION 12.05.      STATEMENTS REQUIRED IN CERTIFICATE OR OPINION.

                  Each  certificate or opinion with respect to compliance with a
condition or covenant  provided for in this Indenture  (other than a certificate
provided  pursuant to TIA ss. 314(a)(4)) shall comply with the provisions of TIA
ss. 314(e) and shall include:

                  (a) a statement  that the Person  making such  certificate  or
         opinion has read such covenant or condition;

                  (b) a  brief  statement  as to the  nature  and  scope  of the
         examination  or  investigation  upon which the  statements  or opinions
         contained in such certificate or opinion are based;

                  (c) a statement that, in the opinion of such Person, he or she
         has made such  examination or  investigation  as is necessary to enable
         him to express an informed  opinion as to whether or not such  covenant
         or condition has been satisfied; and

                  (d) a  statement  as to whether or not, in the opinion of such
         Person, such condition or covenant has been satisfied.

SECTION 12.06.      RULES BY TRUSTEE AND AGENTS.

                  The  Trustee may make  reasonable  rules for action by or at a
meeting of Holders.  The Registrar or Paying Agent may make reasonable rules and
set reasonable requirements for its functions.

SECTION 12.07.      NO PERSONAL LIABILITY OF DIRECTORS, OFFICERS, EMPLOYEES  AND
                    STOCKHOLDERS.

                  No  past,  present  or  future  director,  officer,  employee,
incorporator or stockholder of the Company or any Guarantor, as such, shall have
any liability  for any  obligations  of the Company or any  Guarantor  under the
Notes,  the Subsidiary  Guarantees,  this  Indenture,  the  Registration  Rights
Agreement  or for any claim  based  on, in  respect  of, or by reason  of,  such
obligations or their creation.  Each Holder of Notes by accepting a Note and the
related Subsidiary Guarantees waives and releases all such liability. The waiver
and  release  are part of the  consideration  for  issuance of the Notes and the
Subsidiary Guarantees.

SECTION 12.08.      GOVERNING LAW.

                  THE  INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE
USED TO CONSTRUE THIS INDENTURE, THE NOTES AND THE SUBSIDIARY GUARANTEES.

                                       79
<PAGE>

SECTION 12.09.      NO ADVERSE INTERPRETATION OF OTHER AGREEMENTS.

                  This  Indenture  may  not  be  used  to  interpret  any  other
indenture,  loan or debt agreement of the Company or its  Subsidiaries or of any
other  Person.  Any such  indenture,  loan or debt  agreement may not be used to
interpret this Indenture.

SECTION 12.10.      SUCCESSORS.

                  All  agreements  of the  Company  and the  Guarantors  in this
Indenture and the Notes and the Subsidiary Guarantees, as the case may be, shall
bind  their  respective  successors.  All  agreements  of the  Trustee  in  this
Indenture shall bind its successors.

SECTION 12.11.      SEVERABILITY.

                  In case any  provision in this  Indenture,  in the Notes or in
the  Subsidiary  Guarantees  shall be  invalid,  illegal or  unenforceable,  the
validity,  legality and enforceability of the remaining  provisions shall not in
any way be affected or impaired thereby.

SECTION 12.12.      COUNTERPART ORIGINALS.

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

SECTION 12.13.      TABLE OF CONTENTS, HEADINGS, ETC.

                  The Table of Contents,  Cross-Reference  Table and Headings of
the Articles and Sections of this Indenture  have been inserted for  convenience
of reference  only,  are not to be considered a part of this Indenture and shall
in no way modify or restrict any of the terms or provisions hereof.

                         [Signatures on following page]


                                       80
<PAGE>



                                   SIGNATURES

Dated as of April 26, 1999          IRON MOUNTAIN INCORPORATED


                                    By:   /S/ C. Richard Reese
                                          Name:  C. Richard Reese
                                          Title: Chairman and 
                                                 Chief Executive Officer

Dated as of April 26, 1999          Iron  Mountain  Records  Management,   Inc.,
                                    Criterion Atlantic Property,  Inc., HIMSCORP
                                    of San Diego, Inc., Iron Mountain Consulting
                                    Services,  Inc.,  Iron  Mountain of Maryland
                                    LLC,  Iron  Mountain  Records  Management of
                                    Ohio, Inc., Iron Mountain Records Management
                                    of Michigan,  Inc.,  Iron  Mountain  Records
                                    Management  of  San  Antonio,   Inc.,   Iron
                                    Mountain    Records    Management   of   San
                                    Antonio-FP,  Inc.,  Iron  Mountain/Safesite,
                                    Inc.,   IM-AEI    Acquisition    Corp.,   IM
                                    Billerica,  Inc., Arcus Data Security, Inc.,
                                    Iron Mountain/National  Underground Storage,
                                    Inc.,    Iron    Mountain    Safe    Deposit
                                    Corporation, HIMSCORP of Philadelphia, Inc.,
                                    HIMSCORP of  Pittsburgh,  Inc.,  HIMSCORP of
                                    New Orleans,  Inc., HIMSCORP of Los Angeles,
                                    Inc., HIMSCORP of Cleveland,  Inc., HIMSCORP
                                    of  Portland,  Inc.,  HIMSCORP  of  Detroit,
                                    Inc.,    HIMSCORP    of    Houston,    Inc.,
                                    Recordkeepers,  Inc.,  Arcus  Data  Security
                                    LLC, DSI Technology  Escrow Services,  Inc.,
                                    Iron  Mountain  Records  Management of Utah,
                                    Inc. and Arcus Staffing Resources, Inc.


                                    By:   /S/ C. Richard Reese
                                          Name:  C. Richard Reese
                                          Title: Chairman and 
                                                 Chief Executive Officer

Dated as of April 26, 1999          THE BANK OF NEW YORK, as Trustee


                                    By: /S/ Michael Culhane
                                        Name:  Michael Culhane
                                        Title: Vice President


                                       81
<PAGE>


                                       A-1

                                    EXHIBIT A
                                 (Face of Note)

UNLESS  AND UNTIL IT IS  EXCHANGED  IN WHOLE OR IN PART FOR NOTES IN  DEFINITIVE
FORM, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITORY TRUST
COMPANY (THE "DEPOSITARY") TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE
DEPOSITARY  TO THE  DEPOSITARY  OR ANOTHER  NOMINEE OF THE  DEPOSITARY OR BY THE
DEPOSITARY  OR ANY SUCH NOMINEE TO A SUCCESSOR  DEPOSITARY  OR A NOMINEE OF SUCH
SUCCESSOR  DEPOSITARY.  UNLESS THIS  CERTIFICATE  IS PRESENTED BY AN  AUTHORIZED
REPRESENTATIVE OF THE DEPOSITARY TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF
TRANSFER,  EXCHANGE OR PAYMENT,  AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE
NAME OF CEDE & CO.  OR SUCH  OTHER  NAME AS MAY BE  REQUESTED  BY AN  AUTHORIZED
REPRESENTATIVE  OF DEPOSITARY  (AND ANY PAYMENT  HEREON IS MADE TO CEDE & CO. OR
SUCH  OTHER  ENTITY  AS MAY BE  REQUESTED  BY AN  AUTHORIZED  REPRESENTATIVE  OF
DEPOSITARY),  ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY
OR TO ANY PERSON IS WRONGFUL  INASMUCH AS THE  REGISTERED  OWNER HEREOF,  CEDE &
CO., HAS AN INTEREST HEREIN.1

THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES SECURITIES ACT
OF 1933, AS AMENDED (THE  "SECURITIES  ACT"),  AND THESE  SECURITIES  MAY NOT BE
OFFERED,  SOLD, PLEDGED OR OTHERWISE TRANSFERRED EXCEPT PURSUANT TO AN EXEMPTION
FROM THE  REGISTRATION  REQUIREMENTS OF THE SECURITIES ACT AND, IN EACH CASE, IN
ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES
OR ANY OTHER JURISDICTION.

EACH HOLDER OF THIS SECURITY BY ITS ACCEPTANCE HEREOF AGREES TO (A) OFFER, SELL,
PLEDGE OR OTHERWISE TRANSFER THIS SECURITY ONLY (1) TO THE COMPANY, (2) PURSUANT
TO A  REGISTRATION  STATEMENT  WHICH  HAS  BEEN  DECLARED  EFFECTIVE  UNDER  THE
SECURITIES  ACT,  (3)  TO A  PERSON  IT  REASONABLY  BELIEVES  IS  A  "QUALIFIED
INSTITUTIONAL  BUYER" AS  DEFINED  IN RULE  144A IN A  TRANSACTION  MEETING  THE
REQUIREMENTS OF RULE 144A, (4) PURSUANT TO OFFERS AND SALES TO NON-U.S.  PERSONS
THAT OCCUR OUTSIDE THE UNITED STATES IN A TRANSACTION  MEETING THE  REQUIREMENTS
OF RULE 904 OF REGULATION S UNDER THE  SECURITIES  ACT, (5) TO AN  INSTITUTIONAL
"ACCREDITED  INVESTOR"  (AS  DEFINED  IN  RULE  501(A)(1),  (2),  (3)  OR (7) OF
REGULATION D UNDER THE SECURITIES  ACT (AN "IAI") THAT,  PRIOR TO SUCH TRANSFER,
EXECUTES AND DELIVERS TO THE COMPANY AND THE TRUSTEE A LETTER CONTAINING CERTAIN
REPRESENTATIONS  AND  AGREEMENTS  RELATING TO THE TRANSFER OF THIS SECURITY (THE
FORM OF WHICH LETTER CAN BE OBTAINED FROM THE TRUSTEE) AND AN OPINION OF COUNSEL
IF THE COMPANY OR THE TRUSTEE SO REQUESTS OR (6) PURSUANT TO ANY OTHER AVAILABLE
EXEMPTION FROM THE REGISTRATION REQUIREMENTS UNDER THE SECURITIES ACT (AND BASED
ON AN OPINION OF COUNSEL  IF THE  COMPANY SO  REQUESTS),  SUBJECT IN EACH OF THE
FOREGOING CASES TO APPLICABLE  SECURITIES LAWS OF ANY STATE OF THE UNITED STATES
OR ANY OTHER  APPLICABLE  JURISDICTION AND (B) THAT IT WILL, AND EACH SUBSEQUENT
HOLDER IS REQUIRED  TO,  NOTIFY ANY  PURCHASER  FROM IT OF THIS  SECURITY OF THE
RESALE RESTRICTIONS SET FORTH IN (A) ABOVE.


- -------------------  
1        This paragraph  should be included only if the Note is issued in global
         form.

                                       A-1
<PAGE>


                    8 1/4% Senior Subordinated Notes due 2011

No.                                                                  $__________

                           IRON MOUNTAIN INCORPORATED

promises  to pay  to  ___________________________  or  registered  assigns,  the
principal sum of ____________________________ Dollars on ______, 20[__].

                  Interest Payment Dates:  January 1 and July 1.
                  Record Dates:  December 15 and June 15.

                                                           CUSIP No. [_________]

[Every Global Note  authenticated and delivered  hereunder will bear a legend in
substantially the following form:]2

                  [This  Note  is a  Global  Note  within  the  meaning  of  the
Indenture  hereinafter referred to and is registered in the name of a Depositary
or a nominee  thereof.  This Note may not be  transferred  to, or  registered or
exchanged  for  Notes  registered  in the name of,  any  Person  other  than the
Depositary or a nominee thereof, and no such transfer may be registered,  except
in  the  limited   circumstances   described  in  the   Indenture.   Every  Note
authenticated  and delivered  upon  registration  of transfer of, or in exchange
for, or in lieu of, this Note will be a Global  Note  subject to the  foregoing,
except in such limited circumstances.]2

                                        IRON MOUNTAIN INCORPORATED

                                        By: ____________________________________
                                            Name:
                                            Title:

                                        By: ____________________________________
                                            Name:
                                            Title:
[SEAL]

Dated:

This is one of the Notes referred to 
in the within-mentioned Indenture:

THE BANK OF NEW YORK, as Trustee

By:   _____________________________
      Authorized Signatory

- -------------------  
2        This paragraph  should be included only if the Note is issued in global
         form.

                                      A-2
<PAGE>


                                 (Back of Note)

                         8 1/4% SENIOR SUBORDINATED NOTE
                                    DUE 2011

                  Capitalized  terms used herein have the  meanings  assigned to
them in the Indenture (as defined below) unless otherwise indicated.

                  1.   Interest.   Iron   Mountain   Incorporated,   a  Delaware
corporation (the "Company"), promises to pay interest on the principal amount of
this Note at the rate and in the manner specified below.

                  The Company shall pay in cash interest on the principal amount
of this  Note at the rate per annum of 8 1/4%.  The  Company  will pay  interest
semi-annually  in arrears on  January 1 and July 1 of each year,  commencing  on
July 1,  1999 or if any  such  day is not a  Business  Day  (as  defined  in the
Indenture),  on the next  succeeding  Business  Day (each an  "Interest  Payment
Date"), to Holders of record on the immediately  preceding  December 15 and June
15.

                  Interest  will be  computed  on the  basis of a  360-day  year
consisting of twelve 30-day  months.  Interest shall accrue from the most recent
date to which interest has been paid or, if no interest has been paid,  from the
date of the original  issuance of the Notes.  To the extent lawful,  the Company
shall pay interest on overdue principal at the rate of 1% per annum in excess of
the then applicable interest rate on the Notes; it shall pay interest on overdue
installments of interest (without regard to any applicable grace periods) at the
same rate to the extent lawful.

                  2. Method of Payment.  The  Company  will pay  interest on the
Notes (except defaulted  interest) to the Persons who are registered  Holders of
Notes at the close of business on the record date next  preceding  the  Interest
Payment Date,  even if such Notes are canceled  after such record date and on or
before such Interest  Payment Date.  The Company will pay principal and interest
in money of the United  States  that at the time of payment is legal  tender for
payment of public and private debts.  The Company,  however,  may pay principal,
premium,  if any,  and interest by check  payable in such money.  It may mail an
interest check to a Holder's registered address.

                  3. Paying Agent and Registrar. Initially, the Trustee will act
as Paying  Agent and  Registrar.  The  Company  may  change  any  Paying  Agent,
Registrar  or  co-registrar  without  notice to any  Holder.  The Company or any
Restricted Subsidiary may act in any such capacity.

                  4. Indenture.  The Company issued the Notes under an Indenture
dated as of April 26, 1999 (the "Indenture") between the Company, the Restricted
Subsidiaries named therein and the Trustee. The terms of the Notes include those
stated in the Indenture and those made part of the Indenture by reference to the
Trust Indenture Act of 1939, as amended (15 U.S. Code ss.ss. 77aaa-77bbbb) as in
effect on the date of the  Indenture.  The Notes are  subject to all such terms,
and  Holders  of the  Notes are  referred  to the  Indenture  and such act for a
statement  of  such  terms.   The  terms  of  the  Indenture  shall  govern  any
inconsistencies  between the  Indenture  and the Notes.  The Notes are unsecured
general  obligations  of  the  Company  limited  to  $150,000,000  in  aggregate
principal amount.

                                      A-3
<PAGE>

                  5. Optional Redemption.  Prior to July 1, 2004, the Notes will
be subject to redemption  at any time at the option of the Company,  in whole or
in part, upon not less than 30 nor more than 60 days' notice,  at the Make-Whole
Price, plus accrued and unpaid interest and Liquidated  Damages, if any, thereon
to the applicable  redemption  date. On and after July 1, 2004 the Notes will be
subject to redemption  at any time at the option of the Company,  in whole or in
part,  upon not less than 30 nor more than 60 days'  notice,  at the  redemption
prices  (expressed as  percentages  of principal  amount) set forth below,  plus
accrued and unpaid  interest  and  Liquidated  Damages,  if any,  thereon to the
applicable redemption date, if redeemed during the twelve-month period beginning
on July 1 of the years indicated below:

     Year                                                         Percentage

     2004.............................................              104.125%
     2005.............................................              102.750%
     2006.............................................              101.375%
     2007 and thereafter .............................              100.000%

                  Notwithstanding  the  foregoing,  at any time prior to July 1,
2002,  the Company may redeem up to 35% of the initial  principal  amount of the
Notes  originally  issued with the net proceeds of one or more Qualified  Equity
Offerings at a redemption price equal to 108.25% of the principal amount of such
Notes, plus accrued and unpaid interest and Liquidated  Damages,  if any, to the
date of redemption; provided, that at least 65% of the principal amount of Notes
originally  issued remains  outstanding  immediately after the occurrence of any
such  redemption  and that such  redemption  occurs within 60 days following the
closing of any such Qualified Equity Offering.

                  6.  Mandatory  Redemption.  Except as described in paragraph 7
below,  the Company  shall not be required to make  sinking  fund or  redemption
payments with respect to the Notes.

                  7. Redemption or Repurchase at Option of Holder.  This Note is
subject to purchase at the option of the Holder upon the circumstances set forth
in Section 3.09 and 4.14 of the Indenture.

                  8. Notice of Redemption.  Notice of redemption shall be mailed
at least 30 days but not more than 60 days  before the  redemption  date to each
Holder of Notes to be redeemed at its registered address.  Notes may be redeemed
in part but only in whole multiples of $1,000, unless all of the Notes held by a
Holder are to be redeemed.  On and after the redemption date, interest ceases to
accrue on Notes or portions of them called for redemption.

                  9. Subordination.  The Notes (a) rank pari passu with the 1996
Notes (as defined in the Indenture), (b) rank pari passu with the 1997 Notes (as
defined in the Indenture) and (c) are subordinated to Senior Debt (as defined in
the Indenture)  (whether  outstanding on the 

                                      A-4
<PAGE>

date of the Indenture or thereafter  created,  incurred,  assumed or guaranteed)
and all Obligations (as defined in the Indenture) with respect  thereto.  To the
extent  provided  in the  Indenture,  Senior  Debt  must be paid in full in cash
before the Notes may be paid. The Company agrees, and each Holder by accepting a
Note agrees, to the subordination and authorizes the Trustee to give it effect.

                  10.  Denominations,  Transfer,  Exchange.  The  Notes  are  in
registered  form  without  coupons  in  denominations  of  $1,000  and  integral
multiples of $1,000.  The transfer of Notes may be  registered  and Notes may be
exchanged  as  provided  in the  Indenture.  The  Registrar  and the Trustee may
require a Holder,  among other things, to furnish  appropriate  endorsements and
transfer documents and to pay any taxes and fees required by law or permitted by
the  Indenture.  The Registrar need not exchange or register the transfer of any
Note or portion of a Note selected for redemption. Also, it need not exchange or
register the transfer of any Notes for a period of 15 days before the mailing of
a notice of redemption of Notes,  or during the period between a record date and
the corresponding Interest Payment Date.

                  11.  Persons Deemed  Owners.  Prior to due  presentment to the
Trustee for  registration of the transfer of this Note, the Trustee,  any Agent,
the Company and the  Guarantors may deem and treat the Person in whose name this
Note is registered as its absolute owner for the purpose of receiving payment of
principal  of,  premium,  if any,  and  interest  on this Note and for all other
purposes  whatsoever,  whether  or not  this  Note is  overdue,  and none of the
Trustee,  any Agent, the Company or any Guarantor shall be affected by notice to
the contrary.  The registered holder of a Note shall be treated as its owner for
all purposes.

                  12. Amendments and Waivers. Subject to certain exceptions, the
Indenture  or the Notes may be amended  with the  consent  of the  Holders of at
least a majority in principal  amount of the then  outstanding  Notes (including
consents  obtained  in  connection  with a tender  offer or  exchange  offer for
Notes),  and any  existing  default  or  compliance  with any  provision  of the
Indenture  or the Notes may be  waived  with the  consent  of the  Holders  of a
majority in principal amount of the then outstanding  Notes (including  consents
obtained in connection with a tender offer or exchange offer for Notes). Without
the consent of any Holder, the Indenture or the Notes may be amended to cure any
ambiguity,  defect or  inconsistency,  to provide  for  uncertificated  Notes in
addition to or in place of certificated  Notes, to provide for assumption of the
Company's or any Restricted Subsidiary's obligations to Holders in the case of a
merger or  consolidation or to make any change that would provide any additional
rights or benefits to the Holders or that does not  adversely  affect the rights
of any Holder  under the  Indenture  or to comply with the  requirements  of the
Commission  in order to effect or maintain the  qualification  of the  Indenture
under the Trust Indenture Act.

                  13. Defaults and Remedies.  Events of Default include: default
for 30 days in the  payment  when due of  interest  or  Liquidated  Damages  (as
defined  in the  Indenture)  on the  Notes  (whether  or not  prohibited  by the
subordination  provisions  of the  Indenture);  default in  payment  when due of
principal of or premium,  if any, on the Notes (whether or not prohibited by the
subordination  provisions  of the  Indenture);  failure by the Company to comply
with Section  4.14 of the  Indenture;  failure by the Company or the  Restricted
Subsidiaries  for 60 days after  

                                      A-5
<PAGE>

notice  from the  Trustee or the  Holders of not less than 25% of the  aggregate
principal  amount  of the  Notes  outstanding  to  comply  with any of its other
agreements in the Indenture or the Notes; default under any mortgage,  indenture
or  instrument  under which there may be issued or by which there may be secured
or evidenced any  Indebtedness  for money  borrowed by the Company or any of its
Restricted Subsidiaries (or the payment of which is guaranteed by the Company or
any of its Restricted  Subsidiaries)  whether such Indebtedness or Guarantee now
exists,  or is  created  after the date of the  Indenture,  if (a) such  default
results in the acceleration of such  Indebtedness  prior to its express maturity
or shall  constitute  a default  in the  payment of such  Indebtedness  at final
maturity of such  Indebtedness and (b) the principal amount of such Indebtedness
that has been  accelerated or not paid at maturity,  together with the principal
amount  of any  other  Indebtedness  that  has been  accelerated  or not paid at
maturity,  exceeds  $10.0  million;  failure  by  the  Company  or  any  of  its
Subsidiaries  to pay final  judgments  aggregating  in excess of $10.0  million,
which judgments remain unpaid, undischarged or unstayed for a period of 60 days;
except as permitted  by the  Indenture,  any  Subsidiary  Guarantee  issued by a
Restricted   Subsidiary  shall  be  held  in  any  judicial   proceeding  to  be
unenforceable  or invalid or shall  cease for any reason to be in full force and
effect  or any  Restricted  Subsidiary,  or any  Person  acting on behalf of any
Restricted  Subsidiary,  shall  deny or  disaffirm  its  obligations  under  its
Subsidiary  Guarantees;  and certain  events of bankruptcy  or  insolvency  with
respect  to the  Company  or any of its  Subsidiaries.  If any Event of  Default
occurs  and is  continuing,  the  Trustee  or the  Holders  of at  least  25% in
principal amount of the then  outstanding  Notes may declare all the Notes to be
due and  payable  immediately,  except  that in the case of an Event of  Default
arising from certain events of bankruptcy or insolvency, relating to the Company
or any Significant Subsidiary, all outstanding Notes will become due and payable
without further action or notice; provided, however, that if any Obligation with
respect to Senior Bank Debt is outstanding pursuant to the Credit Agreement upon
a declaration of acceleration of the Notes, the principal,  premium, if any, and
interest on the Notes will not be payable until the earlier of (1) the day which
is five Business Days after written  notice of  acceleration  is received by the
Company  and  the  Credit  Agent,  and  (2)  the  date  of  acceleration  of the
Indebtedness  under the Credit  Agreement.  Holders of the Notes may not enforce
the  Indenture  or the Notes  except as  provided in the  Indenture.  Subject to
certain  limitations,  Holders of a  majority  in  principal  amount of the then
outstanding  Notes may direct the Trustee in its exercise of any trust or power.
The Trustee may  withhold  from  Holders of the Notes  notice of any  continuing
Default or Event of Default  (except a Default or Event of Default  relating  to
the payment of principal,  interest or Liquidated Damages) if it determines that
withholding  notice is in their  interest.  The Company  must  furnish an annual
compliance certificate to the Trustee.

                  14. Subsidiary  Guarantees.  Payment of principal of, premium,
if any, and interest (including interest on overdue principal,  premium, if any,
and interest,  if lawful) on the Notes is  guaranteed  on an  unsecured,  senior
subordinated basis by the Guarantors pursuant to Article 11 of the Indenture.

                  15.  Trustee  Dealings  with  Company.  The Trustee  under the
Indenture,  in its individual or any other  capacity,  may make loans to, accept
deposits from, and perform services for the Company,  any Restricted  Subsidiary
or their  respective  Affiliates,  and may otherwise deal 

                                      A-6
<PAGE>

with the Company, any Restricted Subsidiary or their respective  Affiliates,  as
if it were not Trustee.

                  16. No Recourse  Against  Others.  No past,  present or future
director,  officer,  employee,  incorporator  or  stockholder,  as such,  of the
Company or any Guarantor  shall have any liability  for any  obligations  of the
Company  or any  Guarantor  under the  Notes,  the  Subsidiary  Guarantees,  the
Indenture  or the  Registration  Rights  Agreement or for any claim based on, in
respect of or by reason of such  obligations or their  creation.  Each Holder by
accepting  a Note and the  related  Subsidiary  Guarantees,  if any,  waives and
releases  all  such   liability.   The  waiver  and  release  are  part  of  the
consideration for the issuance of the Notes.

                  17.  Authentication.  This  Note  shall  not  be  valid  until
authenticated by the manual signature of the Trustee or an authenticating agent.

                  18. Abbreviations.  Customary abbreviations may be used in the
name of a Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT
(=  tenants  by  the  entireties),  JT  TEN  (=  joint  tenants  with  right  of
survivorship and not as tenants in common),  CUST (= Custodian),  and U/G/M/A (=
Uniform Gifts to Minors Act).

                  19. CUSIP Numbers. Pursuant to a recommendation promulgated by
the Committee on Uniform  Security  Identification  Procedures,  the Company has
caused CUSIP  numbers to be printed on the Notes and has directed the Trustee to
use CUSIP  numbers in notices of  redemption  as a  convenience  to Holders.  No
representation  is made as to the accuracy of such numbers  either as printed on
the Notes or as contained in any notice of redemption and reliance may be placed
only on the other identification numbers placed thereon.3

                  20. Holders'  Compliance with  Registration  Rights Agreement.
Each Holder of a Note, by his acceptance thereof, acknowledges and agrees to the
provisions of the  Registration  Rights  Agreement,  dated as of April 26, 1999,
among the Company and the  parties  named on the  signature  page  thereof  (the
"Registration  Rights Agreement"),  including but not limited to the obligations
of the Holders with respect to a  registration  and the  indemnification  of the
Company and the Purchasers (as defined therein) to the extent provided therein.

                  21.  Governing  Law. THE INTERNAL LAW OF THE STATE OF NEW YORK
SHALL GOVERN AND BE USED TO CONSTRUE THE INDENTURE, THE NOTES AND THE SUBSIDIARY
GUARANTEES.

- -------------------  
3        This paragraph  should be included only if the Note is issued in global
         form.

                                      A-7
<PAGE>

                  The Company will  furnish to any Holder upon  written  request
and  without  charge a copy of the  Indenture  and/or  the  Registration  Rights
Agreement. Request may be made to:

                  Iron Mountain Incorporated
                  745 Atlantic Avenue
                  Boston, MA 02111
                  Telecopier No.:  (617) 350-7881
                  Attention:  President


                                      A-8
<PAGE>


                                 ASSIGNMENT FORM

                  To  assign  this  Note,  fill in the form  below:  (I) or (we)
assign and transfer this Note to

________________________________________________________________________________
                  (Insert assignee's soc. sec. or tax I.D. no.)

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________
              (Print or type assignee's name, address and zip code)

and  irrevocably  appoint_______________________________________________________
to  transfer  this Note on the books of the  Company.  The agent may  substitute
another to act for him.

________________________________________________________________________________


Date: __________________

                                    Your Signature:_____________________________
                                    (Sign exactly as your name appears on on the
                                    face of this Note)

Signature Guarantee:



                                       A-9
<PAGE>


                       OPTION OF HOLDER TO ELECT PURCHASE

If you want to elect to have this Note  purchased  by the  Company  pursuant  to
Section 4.10 or 4.14 of the Indenture, check the box below:

                     [ ] Section 4.10    [ ] Section 4.14

                  If you want to elect to have only  part of the Note  purchased
by the Company pursuant to Section 4.10 or Section 4.14 of the Indenture,  state
the amount you elect to have purchased: $___________

Date: __________________

                                    Your Signature:_____________________________
                                    (Sign exactly as your name appears on on the
                                    face of this Note)

                                    Tax Identification No.:_____________________
Signature Guarantee:


                                      A-10
<PAGE>


                   SCHEDULE OF EXCHANGES OF DEFINITIVE NOTES4

                  The  following  exchanges  of a part of this  Global  Note for
Definitive Notes have been made:

<TABLE>
<CAPTION>
                                                                         Principal Amount of
                          Amount of decrease     Amount of increase in   this Global Note
                          in Principal Amount    Principal Amount of     following such         Signature of
                          of this Global         this Global Note        decrease (or           authorized signatory
Date of Exchange          Note                                           increase)              of Trustee

<S>                       <C>                    <C>                     <C>                    <C>


</TABLE>

- ------------------- 
4        This should be included only if the Note is issued in global form.

                                      A-11
<PAGE>


                                    EXHIBIT B

       FORM OF SUPPLEMENTAL INDENTURE TO BE DELIVERED BY FUTURE GUARANTORS

                  SUPPLEMENTAL INDENTURE (this "Supplemental Indenture"),  dated
as  of  ________________,   between  __________________  (the  "Guarantor"),   a
subsidiary  of  Iron  Mountain  Incorporated  (or  its  successor),  a  Delaware
corporation  (the  "Company"),  and The Bank of New  York,  a New  York  banking
corporation, as trustee under the Indenture referred to below (the "Trustee").

                               W I T N E S S E T H

                  WHEREAS,  the Company has heretofore executed and delivered to
the  Trustee  an  indenture  (the  "Indenture"),  dated  as of April  26,  1999,
providing for the issuance of an aggregate principal amount of $150,000,000 of 8
1/4% Senior Subordinated Notes due 2011 (the "Notes");

                  WHEREAS,  Section 4.13 of the  Indenture  provides  that under
certain  circumstances the Company is required to cause the Guarantor to execute
and  deliver  to the  Trustee a  supplemental  indenture  pursuant  to which the
Guarantor shall unconditionally guarantee all of the Company's obligations under
the 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  Guarantor  and the Trustee  mutually  covenant  and agree for the equal and
ratable benefit of the Holders of the 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  GUARANTEE.  The  Guarantor  hereby  agrees  that its
obligations to the Holder and the Trustee pursuant to this Subsidiary  Guarantee
shall be as expressly set forth in Article 11 of the Indenture and in such other
provisions of the Indenture as are applicable to the  Guarantors,  and reference
is made to the Indenture for the precise terms of this  Supplemental  Indenture.
The terms of  Article  11 of the  Indenture  and such  other  provisions  of the
Indenture  as are  applicable  to the  Guarantors  are  incorporated  herein  by
reference.

         3. EXECUTION AND DELIVERY OF SUBSIDIARY GUARANTEES

                  (a) To evidence  its  Subsidiary  Guarantee  set forth in this
         Supplemental Indenture,  the Guarantor hereby agrees that a notation of
         such Subsidiary Guarantee substantially in the form of Exhibit C to the
         Indenture  shall be  endorsed by an Officer of 

B-1
<PAGE>

         such Guarantor on each Note  authenticated and delivered by the Trustee
         after the date hereof.

                  (b) Notwithstanding the foregoing, the Guarantor hereby agrees
         that its  Subsidiary  Guarantee  set forth  herein shall remain in full
         force and effect  notwithstanding any failure to endorse on each Note a
         notation of such Subsidiary Guarantee.

                  (c) If an  Officer  whose  signature  is on this  Supplemental
         Indenture or on the Subsidiary Guarantee no longer holds that office at
         the  time the  Trustee  authenticates  the  Note on which a  Subsidiary
         Guarantee  is  endorsed,   the  Subsidiary  Guarantee  shall  be  valid
         nevertheless.

                  (d)  The  delivery  of any  Note  by the  Trustee,  after  the
         authentication  thereof  under  the  Indenture,  shall  constitute  due
         delivery of the  Subsidiary  Guarantee  set forth in this  Supplemental
         Indenture on behalf of the Guarantor.

         4. NO RECOURSE  AGAINST OTHERS.  No past,  present or future  director,
officer,  employee,  incorporator,  stockholder of the Guarantor, as such, shall
have any liability for any obligations of the Company or any Guarantor under the
Notes, any Subsidiary Guarantee, 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 of the Notes by accepting a Note waives and releases
all such  liability.  The waiver and release are part of the  consideration  for
issuance of the Notes.

         5. NEW YORK LAW TO GOVERN.  The  internal  law of the State of New York
shall  govern  and be used  to  construe  this  Supplemental  Indenture  and the
Subsidiary Guarantee.

         6.  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.

         7. EFFECT OF HEADINGS.  The Section headings herein are for convenience
only and shall not affect the construction hereof.


                                      B-2
<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:   _______________, _______

                                   [Guarantor]



                                   By: _________________________________________
                                       Name:
                                       Title:


Dated:   _______________, _______

                                   The Bank of New York



                                   By: _________________________________________
                                       Name:
                                       Title:




                                      B-3
<PAGE>

                                    EXHIBIT C
                  FORM OF NOTATION ON SENIOR SUBORDINATED NOTE
                        RELATING TO SUBSIDIARY GUARANTEE

         Each  Guarantor set forth below and each  Restricted  Subsidiary of the
Company  which in  accordance  with Section 4.13 of the Indenture is required to
guarantee the  obligations  of the Company under the Notes,  upon execution of a
Supplemental Indenture, jointly and severally unconditionally guarantees (i) the
due and  punctual  payment  of the  principal  of and  interest  and  Liquidated
Damages,  if any, on the Notes,  whether at the maturity or interest  payment or
mandatory  redemption date, by  acceleration,  call for redemption or otherwise,
and of interest on the overdue  principal of and interest,  if any, on the Notes
and all other obligations of the Company to the Holders or the Trustee under the
Indenture  or the Notes and (ii) in case of any  extension of time of payment or
renewal  of any Notes or any of such  other  obligations,  that the same will be
promptly paid in full when due or performed in accordance  with the terms of the
extension or renewal, whether at maturity, by acceleration or otherwise.

         The  obligations  of each  Guarantor  to the Holder and to the  Trustee
pursuant to this  Subsidiary  Guarantee  and the  Indenture are as expressly set
forth  in  Article  11 of the  Indenture  and in such  other  provisions  of the
Indenture as are applicable to Guarantors,  and reference is hereby made to such
Indenture  for the  precise  terms of this  Subsidiary  Guarantee.  The terms of
Article 11 of the  Indenture  and such other  provisions of the Indenture as are
applicable to Guarantors are incorporated  herein by reference.  This Subsidiary
Guaranty is subject to release as  described  in Sections  4.13 and 11.17 of the
Indenture,  and the obligations of each Guarantor under this Subsidiary Guaranty
and the Indenture are limited as provided in Section 11.15 of the Indenture.

         This is a  continuing  guarantee  and shall  remain  in full  force and
effect and shall be binding upon each  Guarantor and its  successors and assigns
until full and final payment of all of the Company's obligations under the Notes
and the Indenture and shall inure to the benefit of the  successors  and assigns
of the Trustee and the Holders and, in the event of any  transfer or  assignment
of rights  by any  Holder or the  Trustee,  the  rights  and  privileges  herein
conferred  upon that party shall  automatically  extend to and be vested in such
transferee or assignee,  all subject to the terms and conditions hereof. This is
a guarantee of payment and not a guarantee of collection.

         This  Subsidiary  Guarantee  shall not be valid or  obligatory  for any
purpose  until the  certificate  of  authentication  on the Note upon which this
Subsidiary  Guarantee is noted shall have been executed by the Trustee under the
Indenture by the manual signature of one of its authorized officers.


                                     [RESTRICTED SUBSIDIARY]

                                     By: _______________________________________
                                         Name:
                                         Title:

                                      C-1
<PAGE>


                                    EXHIBIT D

 CERTIFICATE TO BE DELIVERED UPON EXCHANGE OR REGISTRATION OF TRANSFER OF NOTES

Re:  [Series  A]  [Series  B] 8 1/4%  Senior  Subordinated  Notes  due 2011 (the
"Notes") of Iron Mountain Incorporated.

         This Certificate relates to $______ principal amount of Notes held in *
book-entry or * definitive form by _______________________ (the "Transferor").

The  Transferor,  by written  order,  has  requested  the Trustee to exchange or
register the transfer of a Note or Notes. In connection with such request and in
respect of each such Note, the Transferor does hereby certify that Transferor is
familiar  with the  Indenture  relating  to the  above  captioned  Notes and the
transfer of this Note does not require  registration under the Securities Act of
1933, as amended (the "Securities Act") because such Note:

[ ]      is being acquired for the Transferor's own account, without transfer;

[ ]      is being transferred pursuant to an effective registration statement;

[ ]      is being transferred to a "qualified  institutional  buyer" (as defined
         in Rule 144A under the Securities Act), in reliance on such Rule 144A;

[ ]      is being  transferred  pursuant to an exemption  from  registration  in
         accordance with Rule 904 under the Securities Act;**

[ ]      is being  transferred  pursuant to Rule 144 under the Securities Act;**
         or

[ ]      is  being   transferred   pursuant  to  another   exemption   from  the
         registration    requirements    of   the   Securities   Act   (explain:
         _______________________________________________________________________
         ___________________________________________________________________).**

                                         _______________________________________
                                         [INSERT NAME OF TRANSFEROR]
                                         By:_______________________________

Date:_____________________
         *        Check applicable box.

         **       If this box is checked,  this  certificate must be accompanied
                  by an opinion of counsel to the effect  that such  transfer is
                  in compliance with the Securities Act.



                                      D-1
<PAGE>


                                    EXHIBIT E

                            FORM OF PURCHASER LETTER

                                                                          [DATE]


THE BANK OF NEW YORK, as Trustee 
101 Barclay Street, 21st Floor 
New York, New York 10286

IRON MOUNTAIN INCORPORATED
745 Atlantic Avenue
Boston, Massachusetts 02111

[NAME OF SELLER ]

         Re: Iron Mountain  Incorporated  8 1/4% Senior  Subordinated  Notes due
2011

         We are delivering this letter in connection with our proposed  purchase
of $_______ aggregate  principal amount of 8 1/4% Senior  Subordinated Notes due
2011 (the "Notes") of Iron Mountain Incorporated (the "Company").

         We hereby confirm that:

                  1. We have received all  information  relating to the Notes as
         we deem necessary in order to make our investment decision.

                  2. We are an institutional  "accredited  investor" (as defined
         in Rule 501 (a)(1),  (2), (3) or (7) under the  Securities Act of 1933,
         as amended (the  "Securities  Act"))  purchasing for our own account or
         for the account of such an institutional  "accredited investor," and we
         are acquiring the Notes for investment purposes and not with a view to,
         or for offer or sale in connection  with, any distribution in violation
         of the Securities  Act or the laws of any state or other  jurisdiction,
         and we have such  knowledge  and  experience  in financial and business
         matters  as to be  capable  of  evaluating  the merits and risks of our
         investment  in the  Notes,  and we and any  accounts  for  which we are
         acting  are  each  able  to  bear  the  economic  risk  of  our  or its
         investment.

                  3. We understand that any subsequent  transfer of the Notes is
         subject  to  certain  restrictions  and  conditions  set  forth  in the
         Indenture  relating to the Notes (the  "Indenture") and the undersigned
         agrees to be bound by, and not to resell,  pledge or otherwise transfer
         the Notes except in compliance  with, such  restrictions and conditions
         of the Securities Act.

                  4. We understand that the offer and sale of the Notes have not
         been registered under the Securities Act, and that the Notes may not be
         offered or sold except as described  below. We agree, on our own behalf
         and on behalf of any account for which we are purchasing the Notes, and
         each  subsequent  holder of the Notes by its  acceptance  thereof  will
         agree, not to offer, sell or otherwise transfer such Notes prior to the
         date which is two years (or such shorter  period as may be  promulgated
         by the  Securities and Exchange  Commission  pursuant to Rule 144 under
         the  Securities  Act) after the later of the date of original  issue of
         such Notes and the last date on which the Company or any  affiliate  of
         the  Company  was the  owner of such  Notes  (the  "Resale  Restriction
         Termination  Date"),  except  (1) to the  Company,  (2)  pursuant  to a
         registration  statement  which has been  declared  effective  under the
         Securities  Act, (3) to a person we reasonably  believe is a "qualified
         institutional  buyer" as defined in Rule 144A in a transaction  meeting
         the  

                                      E-1
<PAGE>

         requirements of Rule 144A, (4) pursuant to offers and sales to non-U.S.
         persons that occur outside the United  States in a transaction  meeting
         the  requirements of Rule 904 of Regulation S under the Securities Act,
         (5) to an institutional  "accredited  investor" (as defined above) that
         prior to such  transfer,  executes  and delivers to the Company and the
         Trustee (as defined in the  Indenture) a signed  letter,  substantially
         identical  to  this  letter,  containing  certain  representations  and
         agreements  relating  to the  transfer  of the Notes (the form of which
         letter can be obtained  from the  Trustee),  and, if  requested  by the
         Company or the  Trustee,  an opinion of  counsel  (6)  pursuant  to the
         exemption from  registration  provided by Rule 144 under the Securities
         Act if available, or (7) pursuant to any other available exemption from
         the  registration  requirements  of the  Securities  Act (based upon an
         opinion of counsel reasonably  acceptable to the Company if the Company
         so  requests),   subject  in  each  of  the  foregoing  cases,  to  any
         requirement of law that the disposition of our property or the property
         of such  investor  account or  accounts  be at all times  within our or
         their control and to compliance with applicable  securities laws of any
         state or other jurisdiction.  The foregoing restrictions on resale will
         not apply subsequent to the Resale Restriction Termination Date, and we
         further agree to provide to any person purchasing any of the Notes from
         us a notice  advising  such  purchaser  that  resales  of the Notes are
         restricted as stated herein.  We understand  that any Notes acquired by
         us (other than pursuant to Rule 144A) will be in the form of definitive
         physical  certificates  and that such  certificates  will bear a legend
         reflecting the substance of this paragraph.

                  5. We understand  that, on any proposed  offer,  sale or other
         transfer of any Notes prior to the Resale Restriction Termination Date,
         we will be required  to furnish to the  Trustee  and the  Company  such
         certifications, legal opinions, and other information as either of them
         may  reasonably  require  to  confirm  that  the  proposed  transaction
         complies with the foregoing  restrictions.  We further  understand that
         the Notes  purchased by us will bear a legend  reflecting the substance
         of this and the preceding paragraph.

         We  acknowledge  that you,  the Trustee and others are entitled to rely
upon this letter and are irrevocably authorized to produce this letter or a copy
hereof to any interested  party in any  administrative  or legal  proceedings or
official inquiry with respect to the matters covered hereby.  We agree to notify
you  promptly  in writing if any of our  representations  or  warranties  herein
ceases to be accurate and complete.


                                      E-2
<PAGE>


         THIS LETTER SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE  WITH THE
LAWS OF THE STATE OF NEW YORK.


                                    ____________________________________________
                                    (Name of Purchaser)

                                    By: ________________________________________
                                        Name:
                                        Title:
                                        Address:



                                      E-3

                                                                    EXHIBIT 10.2


                   Exchange and Registration Rights Agreement


                  This  Exchange  and   Registration   Rights   Agreement  (this
"Agreement")  dated as of April 26, 1999 among Iron Mountain  Incorporated  (the
"Company"),  a Delaware corporation,  the Company's  subsidiaries a party hereto
(the "Guarantors") and Bear, Stearns & Co. Inc. (the "Representative") on behalf
of  itself  and  the  other  Initial   Purchasers  (the  "Initial   Purchasers")
signatories  hereto,  which Initial  Purchasers have agreed to purchase from the
Company  $150,000,000  in  aggregate  principal  amount of the  Company's 8 1/4%
Senior  Subordinated  Notes  due 2011 (the  "Notes")  pursuant  to the  Purchase
Agreement (as defined below).

                  This  Agreement is made  pursuant to the  Purchase  Agreement,
dated as of April 19, 1999 (the "Purchase  Agreement"),  among the Company,  the
Guarantors,  the  Representative and each of the other Initial  Purchasers.  The
Notes will be issued  pursuant to an Indenture (the  "Indenture") to be dated as
of April 26, 1999 between the Company,  the Guarantors and The Bank of New York,
as trustee (the "Trustee").  As an inducement to the Initial Purchasers to enter
into the Purchase Agreement, the Company agrees with the Initial Purchasers, for
the  benefit  of the  holders of the Notes and the  Registered  Notes (as herein
defined), as follows:

Section 1.        Certain Defined Terms.

                  (a) As used in this Agreement, the following capitalized terms
         shall have the following meanings:

                  "Broker-Dealer"  means any broker or dealer  registered  under
         the Exchange Act.

                  "Business  Day" means any day other than a Saturday,  a Sunday
         or a day on which the banking institutions in the State of New York are
         authorized or obligated by law or executive order to close.

                  "Commission"  means the United States  Securities and Exchange
         Commission.

                  "Consummate"  means,  with  respect to a  Registered  Exchange
         Offer,  (i) the  filing  and  declaration  of  effectiveness  under the
         Securities Act of the Exchange Offer Registration Statement relating to
         the  Registered  Notes to be issued in the Registered  Exchange  Offer,
         (ii)  maintaining the continuous  effectiveness  of such Exchange Offer
         Registration  Statement and keeping the Registered  Exchange Offer open
         for a period of not less than 20  Business  Days  after the date of the
         mailing of the Prospectus  pursuant to Section 2(d)(i) hereof and (iii)
         the delivery by the Company to the Registrar under the Indenture of the
         Registered  Notes  in  the  same  aggregate  principal  amount  as  the
         aggregate  principal  amount of the Notes  that were duly  tendered  by
         Holders  thereof  pursuant  to  the  Registered   Exchange  Offer,  and
         "Consummated" or "Consummation" shall have a correlative meaning.



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                  "Exchange Act" means the United States Securities Exchange Act
         of  1934,  as  amended,  and  the  rules  and  regulations  promulgated
         thereunder.

                  "Exchange Offer  Registration  Statement" means a registration
         statement   (together  with  the  Prospectus   included  therein,   all
         amendments   and   supplements   thereto   (including    post-effective
         amendments)  and all exhibits and materials  incorporated  by reference
         therein) with respect to the Registered Exchange Offer.

                  "Holder"  means any Person who is the registered or beneficial
         owner of the Notes or the Registered Notes, as the case may be.

                  "NASD" means the National  Association of Securities  Dealers,
         Inc.

                  "Person" means an individual, partnership,  corporation, joint
         stock company, joint venture, trust,  unincorporated  organization or a
         government,  agency or  political  subdivision  thereof,  firm or other
         entity.

                  "Prospectus" means the prospectus included in any Registration
         Statement, as amended or supplemented,  including,  without limitation,
         by any post-effective amendments thereto, and all material incorporated
         by reference into such prospectus.

                  "Registration Statement" means the Exchange Offer Registration
         Statement or the Shelf Registration Statement, as the context requires.

                  "Securities  Act" means the United  States  Securities  Act of
         1933, as amended.

                  "Shelf Registration  Statement" means a registration statement
         filed for a delayed or  continuous  period  pursuant to Rule 415 or any
         similar rule that may be adopted by the Commission under the Securities
         Act (together with the Prospectus included therein,  all amendments and
         supplements  thereto  (including  post-effective  amendments)  and  all
         exhibits and materials  incorporated by reference therein) with respect
         to a Shelf Registration.

                  "TIA" means the United States Trust  Indenture Act of 1939, as
         amended and in effect on the date of the Indenture.

                  "Transfer  Restricted  Securities"  means  each  Note and each
         Registered Note, the Holder of which is subject to prospectus  delivery
         requirements  of the  Securities  Act in  order  to sell  such  Note or
         Registered Note, until the occurrence of any of the following events:

                           (i)  the  first  date  on  which  such  Note  may  be
                  exchanged  for a Registered  Note in the  Registered  Exchange
                  Offer,  if  following  such  exchange  such  Holder  would  be
                  entitled to resell such  Registered Note to the public without
                  complying with the  prospectus  delivery  requirements  of the
                  Securities Act;

                           (ii) the date on which such Note has been  registered
                  pursuant to an effective  Shelf  Registration  Statement under
                  the  Securities  Act and  disposed of in  

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<PAGE>

                  accordance  with the  "Plan of  Distribution"  section  of the
                  Prospectus contained in such Shelf Registration Statement;

                           (iii)  the  date on  which  such  Note is sold to the
                  public  pursuant to Rule 144 under the  Securities Act or by a
                  Broker-Dealer   pursuant   to  the   "Plan  of   Distribution"
                  contemplated  by the  Exchange  Offer  Registration  Statement
                  (including delivery of the Prospectus contained therein); or

                           (iv) such Note or  Registered  Note,  as the case may
                  be, shall have ceased to be outstanding.

                  (b) Each of the following  terms is defined in the Section set
         forth opposite such term:

                  Term                                               Section
                  ----                                               -------
                  Agent                                              10(h)
                  Agreement                                          Preamble
                  Company                                            Preamble
                  Indemnified Holder                                 7(a)
                  Indenture                                          Preamble
                  Initial Purchasers                                 Preamble
                  Interest Rate Increase                             8
                  Issue Date                                         2(a)(i)
                  Losses                                             7(a)
                  Notes                                              Preamble
                  Participating Broker-Dealer                        4(a)
                  Purchase Agreement                                 Preamble
                  Registered Exchange Offer                          2(a)
                  Registered Notes                                   2(a)
                  Registration Default                               8
                  Representative                                     Preamble
                  Shelf Registration                                 3(a)
                  Trustee                                            Preamble

Section 2.        Registered Exchange Offer.

                  (a) The Company and the Guarantors shall:

                           (i)  prepare  and,  not later than 75  calendar  days
                  after the Issue Date (as defined in the Indenture),  use their
                  best  efforts to file with the  Commission  an Exchange  Offer
                  Registration  Statement  on  an  appropriate  form  under  the
                  Securities  Act with  respect to a proposed  offer to exchange
                  (the   "Registered   Exchange  Offer")  any  and  all  of  the
                  outstanding  Notes  (including,   if  permitted  by  the  then
                  prevailing interpretations of the staff of the Commission, any
                  Notes held by any of the Initial  Purchasers having the status
                  of an unsold allotment in the initial distribution) for a like
                  aggregate  principal  amount of the  Company's  8 1/4%  

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                  Senior   Subordinated   Notes  due  2011   guaranteed  by  the
                  Guarantors (the "Registered Notes");

                           (ii) unless it would be a violation of applicable law
                  or Commission staff interpretation,  use their best efforts to
                  cause the  Exchange  Offer  Registration  Statement  to become
                  effective  under  the  Securities  Act as soon as  practicable
                  thereafter, but in no event later than 180 calendar days after
                  the Issue Date,  and to keep the Exchange  Offer  Registration
                  Statement  effective  for a period of 180 calendar  days after
                  the Consummation of the Registered Exchange Offer;

                           (iii) in  connection  with the  foregoing,  use their
                  best efforts to file (A) all pre-effective  amendments to such
                  Exchange Offer  Registration  Statement as may be necessary in
                  order to cause such Exchange Offer  Registration  Statement to
                  become effective and (B) cause all necessary filings,  if any,
                  in connection with the registration  and  qualification of the
                  Registered  Notes to be made under the "blue sky" laws of such
                  jurisdictions  as are necessary to permit  Consummation of the
                  Registered  Exchange  Offer  except that in no event shall the
                  Company or the Guarantors be obligated in connection therewith
                  to  qualify as a foreign  corporation  or to execute a general
                  consent to service of process or to take any other action that
                  would subject it or them to service of process in suits in any
                  jurisdiction  other than those  arising out of the offering or
                  sale  of the  Notes  in  such  jurisdiction  pursuant  to such
                  Exchange Offer Registration Statement; and

                           (iv) upon the  effectiveness  of the  Exchange  Offer
                  Registration  Statement,   promptly  commence  the  Registered
                  Exchange  Offer to enable each Holder of the Notes (other than
                  Holders who are affiliates of the Company  (within the meaning
                  of the  Securities  Act) or  underwriters  (as  defined in the
                  Securities  Act)  with  respect  to the  Registered  Notes) to
                  exchange the Notes for Registered Notes.

                  The Company and the Guarantors  shall cause the Exchange Offer
         Registration Statement and the related Prospectus,  as of the effective
         date of such Exchange Offer Registration Statement,  (i) to comply with
         the  applicable  requirements  of the  Securities Act and the rules and
         regulations  of the  Commission  and (ii)  not to  contain  any  untrue
         statement 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 not misleading.

                  (b) The Company and the Guarantors  shall cause the Registered
         Exchange Offer to be consummated in compliance with the Securities Act,
         the  Exchange Act and all other  applicable  laws and  regulations.  No
         securities  other than the  Registered  Notes  shall be included in the
         Exchange Offer Registration  Statement.  The Company and the Guarantors
         shall use their best efforts to cause the Registered  Exchange Offer to
         be Consummated no later than 30 calendar days (or longer if required by
         applicable  law)  after  the  effective  date  of  the  Exchange  Offer
         Registration  Statement.  The Registered  Exchange Offer shall be on an
         appropriate  form  under the  Securities  Act as to permit  resales  of
         Registered Notes by delivering the Prospectus contained in the Exchange
         Offer Registration Statement.

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<PAGE>

                  (c) The  Company  and the  Guarantors  shall  use  their  best
         efforts to keep the Exchange Offer Registration  Statement continuously
         effective and to amend and supplement the Prospectus  contained therein
         in order to permit  such  Prospectus  to be lawfully  delivered  by all
         persons  subject  to  the  prospectus  delivery   requirements  of  the
         Securities  Act for a  period  of up to 180  calendar  days  after  the
         Consummation of the Registered Exchange Offer (or such longer period if
         extended pursuant to Section 4(c)(ix)).

                  (d) In connection  with the  Registered  Exchange  Offer,  the
         Company and the Guarantors shall:

                           (i) mail,  or cause to be mailed,  to each  Holder of
                  the  Notes  a copy  of the  Prospectus  forming  a part of the
                  Exchange  Offer  Registration  Statement,   together  with  an
                  appropriate letter of transmittal and related documents;

                           (ii) keep the  Registered  Exchange  Offer open for a
                  period of not less than 20 Business Days after the date notice
                  thereof  is mailed to the  Holders  of the Notes (or longer if
                  required by applicable law);

                           (iii)  utilize the services of a  depositary  for the
                  Registered  Exchange  Offer with an address in the  Borough of
                  Manhattan, The City of New York; and

                           (iv) permit Holders of the Notes to withdraw tendered
                  Notes at any time  prior to the  close of  business,  New York
                  time,  on the  last  Business  Day  on  which  the  Registered
                  Exchange Offer shall remain open (the "Exchange Date").

                  (e) As  soon as  practicable  after  the  Exchange  Date,  the
         Company and the Guarantors shall:

                           (i) accept for exchange  all Notes duly  tendered and
                  not  validly  withdrawn  pursuant to the  Registered  Exchange
                  Offer;

                           (ii)  deliver or cause to be delivered to the Trustee
                  for cancellation all Notes or portions thereof so accepted for
                  exchange by the Company;

                           (iii)   execute  and  deliver  to,  or  cause  to  be
                  delivered  to, the Trustee for  authentication  and  delivery,
                  Registered Notes in an aggregate principal amount equal to the
                  aggregate  principal  amount  of the  Notes  so  accepted  for
                  exchange; and

                           (iv) cause the  Trustee to  authenticate  and deliver
                  promptly to each Holder of the Notes  accepted  for  exchange,
                  Registered  Notes  having  an  aggregate  principal  amount at
                  maturity equal to the aggregate  principal  amount at maturity
                  of the Notes  surrendered  by such  Holder  and  accepted  for
                  exchange.

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Section 3.        Shelf Registration.

                  (a)      If:

                           (i)   because  of  any  change  in  law  or  in  then
                  prevailing interpretations of the staff of the Commission, the
                  Company is not permitted to effect a Registered Exchange Offer
                  as  contemplated  by  Section 2 hereof or Holders of the Notes
                  (other than Holders who would not be permitted to  participate
                  in the  Registered  Exchange  Offer) would not receive  freely
                  tradeable  Registered  Notes  upon  the  Consummation  of  the
                  Registered  Exchange  Offer,  other than as the result of such
                  holder being an affiliate of the company,

                           (ii) the Registered Exchange Offer is not Consummated
                  within the earlier of 210  calendar  days after the Issue Date
                  and 30 calendar days (or longer if required by applicable law)
                  after the date the Exchange  Offer  Registration  Statement is
                  declared effective by the Commission, or

                           (iii) the  Representative so requests with respect to
                  Notes  acquired and held by the Initial  Purchasers as part of
                  their initial distribution,

         the Company and the Guarantors shall take the following actions:

                                    (A)  After  the  occurrence  of  one  of the
                           events  described  in  3(a)(i),  (ii) or  (iii),  the
                           Company  and the  Guarantors  shall  use  their  best
                           efforts to prepare  and file with the  Commission  as
                           promptly   as   practicable   a  Shelf   Registration
                           Statement on an appropriate form under the Securities
                           Act  relating to the offer and sale by the Holders of
                           the  Notes  in   accordance   with  the   methods  of
                           distribution  set  forth  in the  Shelf  Registration
                           Statement  and Rule 415 under the  Securities  Act (a
                           "Shelf  Registration")  and use their best efforts to
                           cause  such  Shelf   Registration   Statement  to  be
                           declared  effective as promptly as practicable  after
                           such  filing but in no event  later than 90  calendar
                           days  after  the  occurrence  of one  of  the  events
                           described in 3(a)(i),  (ii) or (iii);  provided that,
                           with  respect  to  Notes  acquired  and  held  by the
                           Initial  Purchasers as part of an unsold allotment in
                           the  initial   distribution,   the  Company  and  the
                           Guarantors,  at their  option,  may, if  permitted by
                           then-current   interpretations  by  the  Commission's
                           staff,   file  a  post-effective   amendment  to  the
                           Exchange Offer Registration  Statement containing the
                           information  required  by  Regulation  S-K  Items 507
                           and/or 508, as  applicable,  in  satisfaction  of its
                           obligations  under  Section  3(a)(iii)  with  respect
                           thereto; and

                                    (B) The  Company  and the  Guarantors  shall
                           keep the Shelf  Registration  Statement  continuously
                           effective,  and  agrees  to amend or  supplement  the
                           prospectus  contained  therein  (and use  their  best
                           efforts  to cause any such  amendment  to become  and
                           remain  effective) in order to permit the  prospectus
                           included  therein to be available for resales of, and
                           lawfully  delivered  by the  Holders  of,  the  Notes
                           covered thereby, until the 

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<PAGE>

                           earliest of (x) the second  anniversary  of the Issue
                           Date (or for such longer period if extended  pursuant
                           to Section 4(i)(ix)),  (y) such time as all the Notes
                           covered by such  Shelf  Registration  Statement  have
                           been sold  pursuant  thereto or (z) the date on which
                           all persons  that are not  affiliates  may resell the
                           Notes  pursuant to Rule 144(k)  under the  Securities
                           Act or the date on which the Notes otherwise cease to
                           be Transfer Restricted Securities.

                  (b) The  Company  and the  Guarantors  shall  cause  any Shelf
         Registration  Statement and the related prospectus and any amendment or
         supplement thereto, as of the effective date of such Shelf Registration
         Statement,  amendment or supplement,  (i) to comply with the applicable
         requirements of the Securities Act and the rules and regulations of the
         Commission  and (ii) not to contain any untrue  statement 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 the light of the
         circumstances under which they were made not misleading.

Section 4.        Registration Procedures.

                  (a)  Registered   Exchange   Offer.  In  connection  with  the
         Registered Exchange Offer:

                           (i) the Company and the Guarantors  shall comply with
                  all of the  provisions  of Section 4(c) (other than those that
                  are not applicable);

                           (ii) prior to  effectiveness  of the  Exchange  Offer
                  Registration  Statement,  the Company shall make the following
                  representations (in substantially the form set forth below) to
                  the staff of the Commission:

                                    (A)  that the  Company  is  registering  the
                           Registered Notes and the Registered Exchange Offer in
                           reliance  on  the   position  of  the  staff  of  the
                           Commission  enunciated  in  "Exxon  Capital  Holdings
                           Corporation" SEC No-Action Letter (the "Exxon Capital
                           Letter")  (available May 13, 1988),  "Morgan  Stanley
                           and Co., Inc." SEC No-Action  Letter  (available June
                           5, 1991),  and  "Shearman & Sterling"  SEC  No-Action
                           Letter (available July 2, 1993); and

                                    (B) that the Company  has not  entered  into
                           any arrangement or  understanding  with any person to
                           distribute the Registered Notes to be received in the
                           Registered  Exchange  Offer and that,  to the best of
                           the  Company's  information  and belief,  each Person
                           participating  in the  Registered  Exchange  Offer is
                           acquiring the Registered Notes in its ordinary course
                           of business and has no arrangement  or  understanding
                           with any person to participate in the distribution of
                           the Registered Notes to be received in the Registered
                           Exchange Offer. In this regard, the Company will make
                           each person  participating in the Registered Exchange
                           Offer aware (through the  Prospectus  included in the
                           Exchange Offer  

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                           Registration  Statement or  otherwise)  that,  if the
                           Registered  Notes and the  Registered  Exchange Offer
                           are being  registered  for the  purpose of  secondary
                           resales of the Registered Notes, any Holder using the
                           Registered   Exchange   Offer  to  participate  in  a
                           distribution  of the  Registered  Notes (1) could not
                           rely on the staff  position  enunciated  in the Exxon
                           Capital Letter or similar letters and (2) must comply
                           with    registration    and    prospectus    delivery
                           requirements of the Securities Act in connection with
                           any secondary  resale  transaction  of the Registered
                           Notes. The Company acknowledges that such a secondary
                           resale  transaction should be covered by an effective
                           registration   statement   containing   the   selling
                           security holder  information  required by Item 507 of
                           Regulation S-K;

                           (iii) the Company  will require each Holder that is a
                  Broker-Dealer  and that is the beneficial owner (as defined in
                  Rule 13d-3 under the Exchange  Act) of Notes  acquired for its
                  own account as a result of  market-making  activities or other
                  trading  activities  (a  "Participating  Broker-Dealer"),   to
                  include a representation in such Participating Broker-Dealer's
                  letter of transmittal with respect to the Registered  Exchange
                  Offer that such  Participating  Broker-Dealer  has not entered
                  into any arrangement or understanding  with the Company or any
                  affiliate of the Company to distribute the  Registered  Notes;
                  and

                           (iv)  the   Company   (1)  will  make   each   Person
                  participating in the Registered  Exchange Offer aware (through
                  the  prospectus  included in the Exchange  Offer  Registration
                  Statement or otherwise) that any Broker-Dealer who holds Notes
                  acquired  for its own  account  as a result  of  market-making
                  activities  or  other  trading  activities,  and who  receives
                  Registered  Notes in exchange  for such Notes  pursuant to the
                  Registered Exchange Offer, may be a statutory  underwriter and
                  in connection  with any resale of such  Registered  Notes must
                  deliver  a  Prospectus   meeting  the   requirements   of  the
                  Securities   Act  and   describing   the   methods   by  which
                  Participating Broker-Dealers may resell such Registered Notes,
                  and (2) will  include  in the  transmittal  letter or  similar
                  documentation  to be executed by an exchange  offeree in order
                  to participate in the Registered  Exchange Offer the following
                  additional provision:

                                    "If  the   undersigned  is  a  broker-dealer
                                    holding  Notes  acquired for its own account
                                    as a result of  market-making  activities or
                                    other trading  activities,  the  undersigned
                                    hereby  acknowledges  that it will deliver a
                                    prospectus  meeting the  requirements of the
                                    Securities Act in connection with any resale
                                    of Registered  Notes  received in respect of
                                    such  Notes   pursuant  to  the   Registered
                                    Exchange Offer"

                  and the transmittal  letter or similar  documentation may also
                  include a statement to the effect that by so acknowledging and
                  by delivering a prospectus, a Broker-Dealer will not be deemed
                  to admit that it is an "underwriter" within the meaning of the
                  Securities Act;

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<PAGE>

                           (v)  as a  condition  to  its  participation  in  the
                  Registered  Exchange  Offer  pursuant  to the  terms  of  this
                  Agreement,  each  Holder of the Notes who  tenders  such Notes
                  pursuant to the  Registered  Exchange  Offer  shall  furnish a
                  written  representation to the Company (which may be contained
                  in the  letter of  transmittal  contemplated  by the  Exchange
                  Offer Registration  Statement) to the effect that by accepting
                  the Registered  Exchange Offer,  such Holder represents to the
                  Company that:

                                    (A) it is not an  affiliate  of the  Company
                           (within the meaning of the Securities Act);

                                    (B) it is not engaged in and does not intend
                           to engage in, and has no arrangement or understanding
                           with any person to participate  in, a distribution of
                           the  Registered  Notes to be issued in the Registered
                           Exchange Offer;

                                    (C) it is acquiring the Registered  Notes in
                           its ordinary course of business; and

                                    (D) if it is a  Participating  Broker-Dealer
                           holding  Notes  acquired  for  its own  account  as a
                           result of  market-making  activities or other trading
                           activities,  it  acknowledges  that it will deliver a
                           prospectus meeting the requirements of the Securities
                           Act in connection with any resale of Registered Notes
                           received  in respect of such  Notes  pursuant  to the
                           Registered Exchange Offer;

                  and the transmittal  letter or similar  documentation may also
                  include a statement to the effect that by so acknowledging and
                  by delivering a prospectus, a Broker-Dealer will not be deemed
                  to admit that it is an "underwriter" within the meaning of the
                  Securities Act; and

                           (vi) the Company shall include  within the Prospectus
                  contained  in the  Exchange  Offer  Registration  Statement  a
                  section entitled "Plan of Distribution," in form and substance
                  reasonably  acceptable  to  the  Representative,  which  shall
                  contain:

                                    (A) a statement  substantially to the effect
                           that  any  Broker-Dealer  and any  Holder  using  the
                           Registered   Exchange   Offer  to  participate  in  a
                           distribution  of the Registered  Notes to be acquired
                           in the Registered Exchange Offer:

                                            (I)  could   not  under   Commission
                                    policy  as in  effect  on the  date  of this
                                    Agreement   rely  on  the  position  of  the
                                    Commission  enunciated in Morgan Stanley and
                                    Co. Inc.  (available June 5, 1991) and Exxon
                                    Capital Holdings Corporation  (available May
                                    13,   1988),    as    interpreted   in   the
                                    Commission's  letter to  Shearman & Sterling
                                    (available   July  2,  1993),   and  similar
                                    no-action letters, and

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<PAGE>

                                            (II)    must    comply    with   the
                                    registration    and   prospectus    delivery
                                    requirements   of  the   Securities  Act  in
                                    connection    with   a   secondary    resale
                                    transaction of the Registered Notes and that
                                    such a secondary resale  transaction  should
                                    be  covered  by  an  effective  registration
                                    statement  containing  the selling  security
                                    holder  information  required by Item 507 or
                                    508, as applicable, of Regulation S-K; and

                                    (B) a  summary  statement  of the  positions
                           taken or policies made by the Staff of the Commission
                           with respect to the potential "underwriter" status of
                           any Participating Broker-Dealer.

                  Such "Plan of  Distribution"  section shall also allow the use
of the Prospectus by Participating  Broker-Dealers  for a period of 180 calendar
days from the Consummation of the Exchange Offer, or such shorter period as will
terminate when all the Notes acquired by Participating  Broker-Dealers have been
exchanged  for the  Registered  Notes  and  resold by such  broker-dealers,  and
include a  statement  to the  effect  that any  Broker-Dealer  who  holds  Notes
acquired for its own account as a result of  market-making  activities  or other
trading activities, and who receives Registered Notes in exchange for such Notes
pursuant to the Registered  Exchange Offer,  may be a statutory  underwriter and
must deliver a Prospectus  meeting the  requirements  of the  Securities  Act in
connection  with any  resale of such  Registered  Notes  and that any  profit or
commissions  received  by such  Broker-Dealer  may be deemed to be  underwriting
compensation  under  the  Securities  Act,  and  describing  the  means by which
Participating  Broker-Dealers  may resell  the  Registered  Notes.  The "Plan of
Distribution"  section  in  the  Prospectus  contained  in  the  Exchange  Offer
Registration  Statement shall not name any such  Participating  Broker-Dealer or
disclose the amount of Notes held by any such Participating Broker-Dealer except
to the extent required by Commission policy.

                  (b) Shelf Registration Statement. In connection with any Shelf
         Registration  Statement,  the Company and the  Guarantors  shall comply
         with all the  provisions of Section 4(c) (other than those that are not
         applicable) and shall effect such  registration to permit the resale of
         Notes being sold in accordance  with the intended  method or methods of
         distribution set forth in the Shelf Registration Statement.

                  (c)   Registration   Procedures.   In   connection   with  any
         Registration  Statement and any Prospectus  required by this Agreement,
         the Company and the Guarantors shall:

                           (i)   prepare   and  file  with  the   Commission   a
                  Registration  Statement  on the  appropriate  form  under  the
                  Securities  Act,  which  form  (x)  shall be  selected  by the
                  Company  and (y)  shall,  in the case of a Shelf  Registration
                  Statement,  be available  for the sale of Notes by the selling
                  Holders  thereof  and (z)  shall  comply  as to form  with the
                  requirements   of  the   Securities  Act  and  the  rules  and
                  regulations  thereunder,  and include all financial statements
                  required  by the  Commission  to be filed  therewith,  and use
                  their best  efforts to cause such  Registration  Statement  to
                  become  effective  and to  keep  such  Registration  Statement
                  continuously  effective for the period provided for in Section
                  2, in the 

                                       10
<PAGE>

                  case of an Exchange Offer Registration Statement,  and for the
                  period  provided  for in  Section  3,  in the  case of a Shelf
                  Registration Statement;

                           (ii) (A)  prepare and file with the  Commission  such
                  amendments and post-effective  amendments to such Registration
                  Statement  as may  be  necessary  to  keep  such  Registration
                  Statement  effective  for the  applicable  period set forth in
                  Section 2 or Section 3, as the case may be; and (B) cause each
                  Prospectus  to be  supplemented  by  any  required  prospectus
                  supplement,  and, as so supplemented,  cause the Prospectus to
                  be filed  pursuant to Rule 424 under the Securities Act and to
                  comply in all material respects with the applicable provisions
                  of Rules  424 and 430A  under the  Securities  Act in a timely
                  manner;

                           (iii) advise the Initial  Purchasers,  each Holder of
                  the Notes  included in the Shelf  Registration  Statement and,
                  with respect to the Exchange Offer Registration Statement, any
                  Participating Broker-Dealer from whom the Company has received
                  prior  written   notice  that  it  will  be  a   Participating
                  Broker-Dealer in the Registered Exchange Offer:

                                    (A) when each Registration  Statement or any
                           amendment  thereto has been filed with the Commission
                           and when  each  such  Registration  Statement  or any
                           post-effective  amendment  thereto has been  declared
                           effective;

                                    (B) of any  request  by the  Commission  for
                           amendments or supplements to a Registration Statement
                           or the Prospectus  included therein or for additional
                           information;

                                    (C) of the issuance by the Commission of any
                           stop  order   suspending  the   effectiveness   of  a
                           Registration   Statement   or   the   initiation   or
                           threatening of any proceedings for that purpose;

                                    (D) of the  receipt by either of the Company
                           or its legal counsel of any notification with respect
                           to the suspension of the  qualification  of the Notes
                           or the Registered  Notes for sale in any jurisdiction
                           or the  initiation or  threatening  of any proceeding
                           for such purpose;

                                    (E) when  the  prospectus  contained  in any
                           Registration  Statement may not be used for offers or
                           sales  of the  Registered  Notes  because  (x) of the
                           existence  of any fact or the  happening of any event
                           (including any material non-public  information) that
                           makes untrue any statement of a material fact made in
                           the  Registration  Statement,  the  Prospectus,   any
                           amendment  or  supplement  thereto  or  any  document
                           incorporated by reference  therein,  or that requires
                           the  making of any  additions  to or  changes  in the
                           Registration  Statement or the Prospectus in order to
                           make the  statements  therein not  misleading  or (y)
                           such   prospectus   shall  not  contain  the  current
                           information  required by the  Securities  Act and the
                           rules and  regulations  of the  Commission or (z) the
                           Company  

                                       11
<PAGE>

                           determines that it is advisable to suspend the use of
                           the Prospectus for no more than 15 days, no more than
                           twice  in  any  given  twelve  month  period,  due to
                           pending  material  corporate  developments or similar
                           material  events  that  have  not yet  been  publicly
                           disclosed and as to which the Company believes public
                           disclosure  will be  prejudicial  to the Company;  it
                           being understood that any notice  delivered  pursuant
                           to this subparagraph need not specifically recite the
                           reasons for its  delivery,  provided that the Company
                           consults  with  the  Representative   prior  to  such
                           notice's  delivery as to the reasons  underlying such
                           notice;

                           (iv) use their best  efforts to prevent the  issuance
                  of any order of the Commission suspending the effectiveness of
                  a  Registration  Statement;  and if at any time the Commission
                  shall issue any stop order suspending the effectiveness of the
                  Registration  Statement, or any state securities commission or
                  other regulatory authority shall issue an order suspending the
                  qualification or exemption from  qualification of the Notes or
                  the  Registered  Notes  under state  securities  or "blue sky"
                  laws,  the  Company  and the  Guarantors  shall use their best
                  efforts to obtain the withdrawal of such order at the earliest
                  possible  time, and provide prompt notice of the withdrawal of
                  any such  order to each  Holder of any Notes  included  in the
                  Shelf  Registration  Statement,   and,  with  respect  to  the
                  Exchange Offer  Registration  Statement,  to any Participating
                  Broker-Dealer participating in the Registered Exchange Offer;

                           (v) furnish to the Initial Purchasers,  upon request,
                  and,  in the case of a Shelf  Registration,  to each Holder of
                  any Notes included in the Shelf  Registration  Statement,  and
                  counsel to the Initial Purchasers  referred to in Section 5, a
                  reasonable time prior to filing with the Commission, copies of
                  any Registration  Statement or any Prospectus included therein
                  and any  amendments  or  supplements  thereto  (including  all
                  documents incorporated by reference prior to the effectiveness
                  of such Registration Statement),  which documents,  other than
                  documents  incorporated  by reference,  will be subject to the
                  review  of such  Initial  Purchasers  for a period of at least
                  five Business Days, and the Company shall use its best efforts
                  to  reflect  in each  such  document  when so  filed  with the
                  Commission,  such  comments  as  the  Representative  or  such
                  Holders reasonably may propose within five Business Days after
                  the receipt thereof;

                           (vi)  promptly  prior to the  filing of any  document
                  that is to be  incorporated  by reference  into a Registration
                  Statement  or  Prospectus   subsequent  to  the  effectiveness
                  thereof (A) if requested,  provide  copies of such document to
                  any  Holder  of  any  Notes  included  in  such   Registration
                  Statement,   to  the   Initial   Purchasers   and   (B)   make
                  representatives  of the Company  available  for  discussion of
                  such document and other customary due diligence  matters,  and
                  (C) use its best efforts to include such  information  in such
                  document prior to the filing thereof as Holders or the Initial
                  Purchasers may reasonably request;

                           (vii)  (A) make  available  at  reasonable  times for
                  inspection  by the  Initial  Purchasers  and, in the case of a
                  Shelf  Registration,  Holders  of any Notes  included  

                                       12
<PAGE>

                  in such Registration Statement, and any attorney or accountant
                  retained  by such  Holder or the  Initial  Purchasers,  or any
                  underwriter  participating  in any  disposition  pursuant to a
                  Shelf Registration Statement, all relevant financial and other
                  records,  pertinent  corporate documents and properties of the
                  Company  and  the  Guarantors  and  (B)  cause  the  officers,
                  directors   and   employees  of  the  Company  to  supply  all
                  information  reasonably requested by any such Holder,  Initial
                  Purchaser,  attorney,  accountant or underwriter in connection
                  with such  Registration  Statement  subsequent  to the  filing
                  thereof and prior to its  effectiveness,  in each case,  as is
                  customary  for similar due diligence  examinations;  provided,
                  however,   that  the  foregoing   inspection  and  information
                  gathering   shall,  to  the  greatest  extent   possible,   be
                  coordinated  by  and  on  behalf  of  such  Holders,   Initial
                  Purchasers  and other  parties and be limited to a  reasonable
                  number  of  inspections  in  any  12-month  period;  it  being
                  recognized that any such inspections  undertaken in connection
                  with the release of quarterly or annual financial  information
                  of the  Company  or  other  material  event  shall  be  deemed
                  reasonable;  (viii) if  requested by the Holders of a majority
                  of the  principal  amount  of the  Notes  included  in a Shelf
                  Registration Statement or the Initial Purchasers, (A) promptly
                  incorporate  in  any  Registration  Statement  or  Prospectus,
                  pursuant  to  a  supplement  or  post-effective  amendment  if
                  necessary,  such  information  as such  Holders or the Initial
                  Purchasers  may reasonably  request,  and to which the Company
                  does  not  reasonably   object,   to  have  included  therein,
                  including,  without  limitation,  information  relating to the
                  "Plan of  Distribution" of the Notes, the purchase price being
                  paid therefor and any other terms of the offering of the Notes
                  to be sold in such offering, and (B) make all required filings
                  of any such Prospectus supplement or post-effective  amendment
                  as  promptly as  practicable  after the Company is notified of
                  the matters to be incorporated  in such Prospectus  supplement
                  or post-effective amendment;

                           (ix)  upon the  occurrence  of any  event of the kind
                  described  in  Section  4(c)(iii)(E)  or any other  event that
                  would  cause such  Registration  Statement  or the  Prospectus
                  contained  therein not to be effective  and usable for resales
                  of Notes or  Registered  Notes  during the period  required by
                  this  Agreement,  promptly  (except as contemplated by Section
                  2(c)  or  3(a)(iii)(B)   hereof)   prepare  a   post-effective
                  amendment  to  the  applicable  Registration  Statement  or  a
                  supplement  to the  related  Prospectus  and  use  their  best
                  efforts to cause such amendment to be declared  effective,  or
                  file any  other  required  document  so that the  Registration
                  Statement  and the  Prospectus,  as  thereafter  delivered  to
                  Holders  of  the  Transfer   Restricted   Securities   or  the
                  purchasers  of Transfer  Restricted  Securities,  (A) will not
                  contain  an untrue  statement  of a  material  fact or omit to
                  state  any  material  fact  necessary  to make the  statements
                  therein,  in light of the circumstances  under which they were
                  made,   not  misleading  and  (B)  will  contain  all  current
                  information  required  by the  Securities  Act. If the Initial
                  Purchasers,  the  Holders  of any  Notes or  Registered  Notes
                  covered by a Registration Statement or any known Participating
                  Broker-Dealer  is required by the terms of this  Agreement  to
                  suspend the use of a Prospectus until the requisite changes to
                  such   Prospectus   have  been   made,   then  

                                       13
<PAGE>

                  the  period  of   effectiveness   of  the   applicable   Shelf
                  Registration  Statement  provided  for in  Section  3 and  the
                  Exchange Offer Registration  Statement provided for in Section
                  2 shall  each be  extended  by the  number of days  during the
                  period from and  including the date such notice is required to
                  be given under this  Agreement to and  including the date when
                  the Initial  Purchasers,  each selling  Holder covered by such
                  Registration   Statement,    and   any   known   Participating
                  Broker-Dealer  shall have received an amended or  supplemented
                  Prospectus  contemplated  by this  clause  (ix) or shall  have
                  received Advice (as defined below) from the Company;

                           (x) in  the  case  of a  Registered  Exchange  Offer,
                  deliver (A) to the  Representative one manually signed copy of
                  the Exchange Offer  Registration  Statement and (B) to each of
                  the other Initial Purchasers at least one copy of the Exchange
                  Offer Registration  Statement, in each case without charge and
                  with  and  any  post-effective  amendment  thereto,  including
                  financial  statements  and  schedules,  and, if the  recipient
                  requests,  all exhibits (including those, if any, incorporated
                  by reference);

                           (xi) in the  case  of a  Registered  Exchange  Offer,
                  deliver  to  the   Initial   Purchasers,   any   Participating
                  Broker-Dealer  and such other  persons  required  to deliver a
                  Prospectus  in  connection  with the  offering and sale of the
                  Registered  Notes  following the  Registered  Exchange  Offer,
                  without  charge,  as  many  copies  of  the  final  Prospectus
                  included in the Exchange Offer Registration  Statement and any
                  amendment or supplement thereto as such persons may reasonably
                  request, and, in connection therewith, the Company and each of
                  the Guarantors  hereby consents,  subject to any notice by the
                  Company in accordance  with this Section 4(c) of the existence
                  of  any  fact  or  event  of the  kind  described  in  Section
                  4(c)(iii)(E), to the use of the Prospectus or any amendment or
                  supplement  thereto by the Initial  Purchasers,  if necessary,
                  any Participating  Broker-Dealer and such other persons as are
                  required  to deliver a  Prospectus  following  the  Registered
                  Exchange Offer in connection with the offering and sale of the
                  Registered  Notes covered by the Prospectus,  or any amendment
                  or  supplement  thereto,   included  in  such  Exchange  Offer
                  Registration Statement;

                           (xii) in the case of a Shelf Registration, furnish to
                  the  Representative,  without charge, one manually signed copy
                  of the Shelf  Registration  Statement  and any  post-effective
                  amendment   thereto,   including   financial   statements  and
                  schedules,  and,  if the  recipient  Holder so  requests,  all
                  exhibits (including those, if any, incorporated by reference);

                           (xiii) in the case of a Shelf Registration,  deliver,
                  without charge,  to the Initial  Purchasers and each Holder of
                  the Notes included within the coverage of a Shelf Registration
                  Statement  which was declared  effective by the  Commission as
                  many  copies of the  Prospectus  (including  each  preliminary
                  prospectus) included in such Shelf Registration  Statement and
                  any  amendment  or  supplement  thereto  as  such  person  may
                  reasonably request, and, in connection therewith,  the Company
                  and each of the  Guarantors  hereby  consents,  subject to any
                  notice by the Company in accordance  with this Section 4(c) of
                  the  existence  of any fact or event of the 

                                       14
<PAGE>

                  kind  described  in  Section  4(c)(iii)(E),  to the use of the
                  Prospectus or any  amendment or supplement  thereto by each of
                  the  selling  Holders  of the  Notes  in  connection  with the
                  offering and sale of the Notes covered by the  Prospectus,  or
                  any  amendment or supplement  thereto,  included in such Shelf
                  Registration Statement,

                           (xiv) in the case of a Shelf Registration,  (A) enter
                  into such customary agreements and take all such other actions
                  in connection therewith in order to expedite or facilitate the
                  offering  or  disposition  of the Notes  included in the Shelf
                  Registration  Statement,   including,   but  not  limited  to,
                  furnishing  to each Initial  Purchaser  and each Holder of any
                  Notes included in the Shelf  Registration  Statement,  in such
                  substance and scope as they may request and as are customarily
                  made  by  issuers  to  underwriters  in  primary  underwritten
                  offerings,  upon the date of the  effectiveness  of the  Shelf
                  Registration Statement:

                                            (1) a certificate, dated the date of
                                    effectiveness  of  the  Shelf   Registration
                                    Statement,  signed by (x) the  president  or
                                    chief  executive  officer of the Company and
                                    (y)  the  chief  financial  officer  or  the
                                    principal financial or accounting officer of
                                    the  Company,  confirming,  as of  the  date
                                    thereof,   that   the   Shelf   Registration
                                    Statement and the related  Prospectus do not
                                    contain any untrue  statement  of a material
                                    fact  or  omit  to  state  a  material  fact
                                    required to be stated  therein or  necessary
                                    to   make   the   statements   therein   not
                                    misleading  and as to such other  matters as
                                    such parties may reasonably request;

                                            (2)  opinions,  dated  the  date  of
                                    effectiveness  of  the  Shelf   Registration
                                    Statement,   of  outside   counsel  for  the
                                    Company,   covering   such  matters  as  are
                                    customarily    included   in   opinions   to
                                    underwriters    in   primary    underwritten
                                    offerings and as are reasonably requested by
                                    such parties; and

                                            (3)  a  customary   comfort  letter,
                                    dated as of the date of effectiveness of the
                                    Shelf  Registration   Statement,   from  the
                                    independent  certified public accountants of
                                    the Company,  in customary form and covering
                                    matters of the type  customarily  covered in
                                    comfort    letters   by    underwriters   in
                                    connection    with   primary    underwritten
                                    offerings,  and  addressing,  to the  extent
                                    relevant,  the  matters  set  forth  in  the
                                    comfort   letters   delivered   pursuant  to
                                    Section 6(h) of the Purchase Agreement;

                                    (B) in the case of an underwriting agreement
                           entered into in connection with a Shelf Registration,
                           set  forth  in full  indemnification  provisions  and
                           procedures  substantially  in the form of  those  set
                           forth in Section 7 hereof with respect to all parties
                           required to be  indemnified  pursuant to such Section
                           7; and

                                     15
<PAGE>

                                    (C)  deliver   such  other   documents   and
                           certificates  as may be reasonably  requested by such
                           parties to evidence compliance with clause (A) above.

                           The Company shall be required to make an underwritten
                  offering  only upon the  request of Holders of at least 20% of
                  the  aggregate   principal  amount  of  the  Registered  Notes
                  outstanding  at the time  such  request  is  delivered  to the
                  Company.

                           (xv)  prior  to any  public  offering  of  any  Notes
                  pursuant to a Shelf Registration Statement, (A) cooperate with
                  the selling Holders participating in a Shelf Registration, and
                  their respective  counsel, in connection with the registration
                  and  qualification  of the Notes under the securities or "blue
                  sky" laws of such  jurisdictions  as the  selling  Holders may
                  request, and (B) do any and all other acts or things necessary
                  or  advisable to enable the  offering or  disposition  in such
                  jurisdictions of the Notes, as the case may be, covered by the
                  Shelf  Registration  Statement;  except that in no event shall
                  Company or any Guarantor be obligated in connection  therewith
                  to  qualify as a foreign  corporation  or to execute a general
                  consent to service of process or to take any other action that
                  would  subject  it to  service  of  process  in  suits  in any
                  jurisdiction  other than those  arising out of the offering or
                  sale  of  Notes  in  such   jurisdiction   pursuant   to  such
                  Registration Statement;

                           (xvi)  to the  extent  that  any  Notes  are  held in
                  certificated   form  and  are  not   represented   by   global
                  certificates,  cooperate  with the holders of such  Notes,  in
                  connection  with the Registered  Exchange Offer, to include an
                  aggregate   principal   amount  of  such  Notes  in  a  global
                  certificate  representing  the Registered  Notes,  and, to the
                  extent that any Notes or Registered  Notes are not eligible to
                  be held in  book-entry  form,  prepare  and  deliver  Notes or
                  Registered  Notes  in  certificated  form as the  Holders  may
                  request;  provided,  in either case,  that the Company and the
                  Guarantors  will cooperate with  participating  Broker Dealers
                  (in the case of a Registered  Exchange  Offer) and any Holders
                  selling Notes pursuant to a Shelf Registration  Statement,  to
                  facilitate the timely delivery of such  certificates  (whether
                  in  book-entry  or   certificated   form  as  provided  above)
                  representing  such Registered  Notes or Notes, as the case may
                  be,  to be sold  which  do not bear  any  restrictive  legends
                  (other than any customary  legend  required by the  applicable
                  depository  or any legend  that would be required by a Note or
                  Registered Note held by an affiliate of the Company);

                           (xvii) use their  best  efforts to cause the Notes or
                  Registered Notes covered by the  Registration  Statement to be
                  registered  with  or  approved  by  such  other   governmental
                  agencies or authorities  (except as may be required  solely as
                  consequence  of a Holder's  business)  as may be  necessary to
                  enable the  Consummation of the Registered  Exchange Offer or,
                  in the case of a Shelf  Registration,  as may be applicable to
                  the  Company  with  respect  to  filing  and  having  declared
                  effective the Shelf Registration Statement;

                                       16
<PAGE>

                           (xviii)  obtain  appropriate  CUSIP  numbers for each
                  series of Registered  Notes not later than the effective  date
                  of the  Registration  Statement  and provide the Trustee  with
                  printed certificates for the Notes or Registered Notes, as the
                  case  may  be,  in  a  form  eligible  for  deposit  with  The
                  Depository  Trust  Company,  or  with  Morgan  Guaranty  Trust
                  Company  of New York,  Brussels  Office,  as  operator  of the
                  Euroclear System ("Euroclear") and Cedel Bank, Societe Anonyme
                  ("CEDEL");

                           (xix) otherwise use their best efforts to comply with
                  all applicable  rules and regulations of the  Commission,  and
                  make  generally  available to its security  holders,  no later
                  than 45 days after the end of any fiscal  quarter  (or 90 days
                  after the end of any fiscal  year),  a  consolidated  earnings
                  statement   (which  need  not  be  audited)   satisfying   the
                  requirements   of  Section   11(a)  of  the   Securities   Act
                  (including,  at the option of the Company,  Rule 158 under the
                  Securities  Act)  for a  period  of  at  least  twelve  months
                  beginning   after  the  effective   date  of  a   Registration
                  Statement; and

                           (xx) cause the  Indenture to be  qualified  under the
                  TIA  not  later   than  the   effective   date  of  the  first
                  Registration Statement required to be filed by this Agreement,
                  and, in connection  therewith:  (A) cooperate with the Trustee
                  and the  Holders  of  Notes  to  effect  such  changes  to the
                  Indenture  as may be  required  for  such  Indenture  to be so
                  qualified  in  accordance  with the terms of the TIA;  and (B)
                  execute,  and use all reasonable  efforts to cause the Trustee
                  to execute,  all documents that may be required to effect such
                  changes and all other forms and documents required to be filed
                  with  the  Commission  to  enable  such  Indenture  to  be  so
                  qualified in a timely manner.

                  Each  Initial  Purchaser,  each Holder of Notes  included in a
Shelf  Registration  Statement and each  Participating  Broker-Dealer  using the
prospectus included in the Exchange Offer Registration  Statement for the resale
of Registered  Notes, by its acquisition of a Note or a Registered Note,  agrees
that,  upon receipt of any notice from the Company of the  existence of any fact
or event of the kind described in Section 4(c)(iii)(E),  such Initial Purchaser,
Holder or Participating  Broker-Dealer will forthwith discontinue disposition of
the Notes or the Registered  Notes,  as  applicable,  and suspend the use of the
Prospectus until such Initial Purchaser,  Holder or Participating  Broker-Dealer
has received copies of a supplemented  or amended  Prospectus as contemplated by
Section  4(c)(ix),  or until it is  advised  in writing  (the  "Advice")  by the
Company that the use of the Prospectus may be resumed,  and has received  copies
of any additional or supplemental  filings that are incorporated by reference in
the Prospectus. If so directed by the Company, each such Initial Purchaser, each
such selling Holder of Notes or each such  Participating  Broker-Dealer,  as the
case may be, will  deliver to the Company  (at the expense of the  Company)  all
copies,  other  than  permanent  file  copies  then  in such  Holder's,  Initial
Purchaser's  or  Participating  Broker-Dealer's  possession,  of the  Prospectus
covering such Notes or Registered Notes, as applicable,  that was current at the
time of receipt of such notice.

                                       17
<PAGE>

Section 5.        Hold-Back Agreements.

                  The Company  agrees,  without the prior written consent of the
Representative, not to offer, sell, contract to sell or otherwise dispose of any
debt  securities  of the Company or any  Guarantor or warrants to purchase  debt
securities  of the Company or any Guarantor  substantially  similar to the Notes
(other than (i) the Notes, (ii) the Registered  Notes,  (iii) the Guarantees (as
defined in the Purchase Agreement),  (iv) the Registered  Guarantees (as defined
in the  Purchase  Agreement)  and (v)  commercial  paper  issued in the ordinary
course of business),  from the date of this Agreement through the earlier of (i)
45 calendar days after the  Consummation  of the  Registered  Exchange Offer and
(ii) 210 calendar days after the Issue Date.

Section 6.        Registration Expenses.

                  All  expenses  incident  to the  Company's  performance  of or
compliance with its obligations under Sections 2, 3 and 4 of this Agreement will
be borne by the Company  regardless of whether a Registration  Statement becomes
effective,  and, in the case of a Shelf Registration Statement, the Company will
reimburse the Holders covered thereby for the reasonable fees and  disbursements
of one counsel  designated by the Holders of a majority of the principal  amount
of the Notes or Registered Notes included in any such Registration  Statement to
act as counsel for the Holders in connection therewith.

Section 7.        Indemnification and Contribution.

                  (a) In connection with any Registration Statement, the Company
         and each of the Guarantors,  jointly and severally, agrees to indemnify
         and  hold  harmless  (i) each  Initial  Purchaser,  each  Participating
         Broker-Dealer  and  each  Holder  of  Notes  to  be  included  in  such
         Registration Statement,  (ii) each person, if any, who controls (within
         the  meaning of Section 15 of the  Securities  Act or Section 20 of the
         Exchange Act) any such Initial Purchaser,  Participating  Broker-Dealer
         or Holder  (any of the  persons  referred  to in this clause (ii) being
         hereinafter  referred  to as a  "controlling  person")  and  (iii)  the
         respective officers, directors,  partners,  employees,  representatives
         and agents of any such Initial Purchaser,  Participating  Broker-Dealer
         or Holder or controlling  person (any person referred to in clause (i),
         (ii)  or  (iii)  may  hereinafter  be  referred  to as an  "Indemnified
         Holder")  from and  against any and all  losses,  liabilities,  claims,
         damages and expenses whatsoever as incurred (including, but not limited
         to,  reasonable  attorneys  fees  and any and all  reasonable  expenses
         whatsoever  incurred in  investigating,  preparing or defending against
         any litigation,  commenced or threatened, or any claim whatsoever, and,
         subject to Section 6(c),  any and all amounts paid in settlement of any
         claim or litigation),  joint or several,  to which any such Indemnified
         Holder may become subject under the Securities Act, the Exchange Act or
         otherwise (collectively,  "Losses"), insofar as such Losses (or actions
         or proceedings  in respect  thereof) arise out of or are based upon any
         untrue  statement  or  alleged  untrue  statement  of a  material  fact
         contained in any Registration Statement or Prospectus, or any amendment
         or  supplement  thereto,  or any omission or alleged  omission to state
         therein a material fact  required to be stated  therein or necessary to
         make the statements  therein,  in the light of the circumstances  under
         which they were  made,  not  misleading;  provided,  however,  that the
         Company and the Guarantors  shall not be liable in any such case to the
         extent,  but  only to the  extent,  that any such  Loss (or  

                                       18
<PAGE>

         action or proceeding in respect thereof) arises out of or is based upon
         an untrue  statement  or alleged  untrue  statement  in or  omission or
         alleged  omission  from  the   Registration   Statement  or  Prospectus
         contained  therein made in reliance upon and in conformity with written
         information   furnished  to  the  Company  by  or  on  behalf  of  such
         Indemnified Holder expressly for use therein. This indemnity obligation
         will  be in  addition  to any  liability  which  the  Company  and  the
         Guarantors may otherwise  have to such  Indemnified  Holder,  including
         under this Agreement.

                  (b) The Company hereby also agrees that in connection with any
         underwritten  offering of Transfer  Restricted  Securities  pursuant to
         Section  3,  the  Company  and  each  of the  Guarantors,  jointly  and
         severally,  will also  indemnify  any  underwriters,  selling  brokers,
         dealers and similar securities industry professionals  participating in
         the  distribution,   their  officers,  directors,   employees,  agents,
         advisors and  representatives,  and each  controlling  person  thereof,
         substantially  to the same  extent as  provided  in  Section  6(a) with
         respect to the  indemnification of each Initial Purchaser and Holder of
         Transfer  Restricted  Securities  (and such Persons will  indemnify the
         Company and the Guarantors and each  controlling  person thereof to the
         same extent as provided in Section 6(c)).

                  (c) Each Indemnified  Holder will,  severally and not jointly,
         indemnify  and hold  harmless  the Company and the  Guarantors  and any
         person  controlling the Company and the Guarantors  (within the meaning
         of Section 15 of the Securities Act or Section 20 of the Exchange Act),
         each  Initial  Purchaser  and the  other  selling  Holders,  and  their
         respective officers, directors,  partners,  employees,  representatives
         and agents, and any controlling  person thereof,  against any Losses to
         which the Company, any Guarantor any Initial Purchaser or other selling
         Holder,   or   any   such   officer,   director,   partner,   employee,
         representative,  agent  or  controlling  persons  thereof,  may  become
         subject under the Securities  Act, the Exchange Act or otherwise,  from
         and  against  any  Losses   insofar  as  such  Losses  (or  actions  or
         proceedings  in  respect  thereof)  arise out of or are based  upon any
         untrue  statement  or  alleged  untrue  statement  of a  material  fact
         contained in any Registration Statement or Prospectus contained therein
         or any  amendment  or  supplement  thereto or the  omission  or alleged
         omission to state therein a material fact required to be stated therein
         or  necessary  to  make  the  statements   therein,  in  light  of  the
         circumstances  under which they were made, not misleading,  but in each
         case only to the extent  that the untrue  statement  or alleged  untrue
         statement or omission or alleged omission was made in reliance upon and
         in conformity with written  information  furnished to the Company by or
         on  behalf  of such  Holder  specifically  for use  therein,  and shall
         reimburse  the  Company  and the  Guarantors  for any  legal  or  other
         expenses  reasonably  incurred  by the Company  and the  Guarantors  in
         connection  with  investigating  or  preparing  to defend or  defending
         against or appearing as third party witness in connection with any such
         Loss as such expenses are incurred.

                  (d)  Promptly  after  receipt by an  indemnified  party  under
         subsection  (a) or (c) of this Section 7 of notice of the  commencement
         of any action,  such  indemnified  party  shall,  if a claim in respect
         thereof  is to be  made  against  the  indemnifying  party  under  such
         subsection,  notify each party  against whom  indemnification  is to be
         sought in writing of the  commencement  thereof  (but the failure so to
         notify an  indemnifying  party shall not relieve it from any  liability
         which it may have under  this  Section  6). In case any such  

                                       19
<PAGE>

         action is brought against any indemnified  party,  and such indemnified
         party notifies an indemnifying party of the commencement  thereof,  the
         indemnifying  party will be entitled to  participate  in the defense of
         such  action,  and to the extent such  indemnifying  party may elect by
         written  notice  delivered  to the  indemnified  party  promptly  after
         receiving the aforesaid  notice from such  indemnified  party to assume
         the defense  thereof  with  counsel  satisfactory  to such  indemnified
         party.  Notwithstanding the foregoing, the indemnified party or parties
         shall  have the right to employ  its or their own  counsel  in any such
         case, but the fees and expenses of such counsel shall be at the expense
         of such indemnified  party or parties unless (a) the employment of such
         counsel   shall  have  been   authorized  in  writing  by  one  of  the
         indemnifying parties in connection with the defense of such action, (b)
         the indemnifying parties shall not have employed counsel to have charge
         of the defense of such action within a reasonable  time after notice of
         commencement of the action,  or (c) such  indemnified  party or parties
         shall have reasonably concluded that there may be defenses available to
         it or them which are different from or additional to those available to
         one or all of the indemnifying  parties (in which case the indemnifying
         parties  shall not have the right to direct the  defense of such action
         on behalf of the indemnified party or parties),  in any of which events
         such fees and expenses shall be borne by the  indemnifying  parties (it
         being  understood,  however,  that the indemnifying  party shall not be
         liable  for the  expenses  of more than one  separate  counsel  and one
         additional local counsel for each relevant  jurisdiction).  Anything in
         this subsection to the contrary notwithstanding,  an indemnifying party
         shall not be liable for any settlement of any claim or action  effected
         without  its written  consent  (which  consent may not be  unreasonably
         withheld).

                  (e)  If  the  foregoing   indemnification  is  unavailable  or
         insufficient  to an indemnified  party for any reason in respect to any
         Losses or reimbursable  expenses  referred to therein,  then in lieu of
         indemnification, each indemnifying party shall contribute to the amount
         paid or payable,  including expenses, by such indemnified party in such
         proportion as is appropriate to reflect the relative  benefits received
         (or anticipated to be received) by the indemnifying party or parties on
         the one hand and the  indemnified  party on the other from the offering
         of the  Notes or  Registered  Notes,  as the case may be,  or,  if such
         allocation is not permitted by applicable  law, then in such proportion
         as is  appropriate to reflect not only the relative  benefits  received
         (or  anticipated to be received) but also the relative fault of each of
         the parties in connection  with the  statements or omissions or alleged
         statements or omissions  that  resulted in such Losses,  as well as any
         other  relevant  equitable  considerations.  The relative  fault of the
         parties shall be  determined  by reference to, among other things,  (i)
         whether  any  losses,   claims,   damages  or  liabilities   relate  to
         information  supplied  by the  Company or such  Holder of Notes or such
         other  indemnified  person,  as the  case  may be,  (ii)  the  parties'
         relative  intent,  knowledge,  access to information and opportunity to
         correct or prevent  such  statement  or  omission,  and (iii) any other
         equitable considerations appropriate in the circumstances. The Company,
         the Guarantors and each  indemnified  party agrees that it would not be
         just and equitable if the amount of such  contribution  were determined
         by pro rata  allocation or by any other method of allocation  that does
         not take into account the equitable  considerations  referred to in the
         first  sentence  of  this  paragraph  (e).  Notwithstanding  any  other
         provision of this  paragraph (e), the Holders of the Notes shall not be
         obligated  to make  contributions  hereunder in any amount in excess of
         the amount by which the net 

                                       20
<PAGE>

         proceeds  received by such Holders  from the sale of the Notes  exceeds
         the amount of damages which such Holders have  otherwise  been required
         to pay in respect of the same or any  substantially  similar claim, and
         no person guilty of fraudulent misrepresentation (within the meaning of
         Section 11(f) of the Securities  Act) shall be entitled to contribution
         from   any   person   who   was   not   guilty   of   such   fraudulent
         misrepresentation.   The  obligations  of  the  Holders  to  contribute
         pursuant  to  this  Section  7(e)  are  several  in  proportion  to the
         respective  principal  amount  of  Notes  held by  each of the  Holders
         hereunder  and not joint.  For  purposes  of this  Section  7(e),  each
         director, officer, employee and agent of any indemnified party and each
         person, if any, who controls such indemnified party (within the meaning
         of Section 15 of the  Securities Act or Section 20 of the Exchange Act)
         shall have the same rights to  contribution as such  indemnified  party
         and each director and officer of the Company,  and each person, if any,
         who  controls  the  Company  (within  the  meaning of Section 15 of the
         Securities  Act or Section 20 of the Exchange  Act) shall have the same
         rights to contribution as the Company.

                  (f) The  foregoing  provisions  are in  addition to any rights
         that an  indemnified  party may have at common  law or  otherwise.  The
         agreements  contained in this  Section 7 shall  survive the sale of the
         Notes or the Registered Notes pursuant to a Registration  Statement and
         shall remain in full force and effect, regardless of any termination or
         cancellation  of  this  Agreement  or any  investigation  made by or on
         behalf of any indemnified party.

Section 8.        Liquidated Damages.

                  The Company,  the Guarantors and the Initial  Purchasers agree
that the Holders of Transfer  Restricted  Securities  will suffer damages if the
Company  and the  Guarantors  fail  to  fulfill  their  obligations  under  this
Agreement  and that it would not be  feasible  to  ascertain  the extent of such
damages  with  precision.  Accordingly,  in  the  event  that,  for  any  reason
whatsoever,  (i) the  Company  has not filed  the  Exchange  Offer  Registration
Statement with the Commission on or prior to the 75th calendar day following the
Issue  Date,  (ii)  such  Exchange  Offer  Registration  Statement  has not been
declared  effective  by the  Commission  on or prior to the 180th  calendar  day
following  the Issue  Date,  (iii) the  Registered  Exchange  Offer has not been
Consummated  on or prior to the 30th  calendar  day (or  longer if  required  by
applicable  law)  following  the date on which the Exchange  Offer  Registration
Statement  is declared  effective  by the  Commission  or (iv) any  Registration
Statement  required  by the  terms  of this  Agreement  is  filed  and  declared
effective but shall  thereafter  cease to be effective  (except as  specifically
permitted   herein)  without  being  succeeded   immediately  by  an  additional
Registration  Statement filed and declared effective (any such event referred to
in clauses (i)  through  (iv),  a  "Registration  Default"),  then the per annum
interest rate borne by the Notes (and, if applicable, the Registered Notes) will
increase  with  respect to the first 90-day  period  immediately  following  the
occurrence of such Registration  Default by 0.25% per annum over the rate stated
on the  face of the  Notes  (and,  if  applicable,  the  Registered  Notes),  as
liquidated  damages  and  not  as a  penalty,  commencing  on  the  date  of the
occurrence of a Registration  Default,  and will increase by an additional 0.25%
per annum,  as  liquidated  damages and not as a penalty,  with  respect to each
subsequent  90-day period (the aggregate of such interest rate  increases  being
the "Interest Rate  Increase");  provided,  however,  (1) upon the filing of the
Exchange Offer Registration  Statement or a Shelf Registration Statement (in the
case of clause (i) above),  (2) upon the  effectiveness  of 

                                       21
<PAGE>

the Exchange Offer Registration  Statement or a Shelf Registration Statement (in
the case of clause (ii)  above),  (3) upon the  Consummation  of the  Registered
Exchange  Offer (in the case of clause (iii) above),  or (4) at such time as the
Registration  Statement  that has  ceased  to  remain  effective  again  becomes
effective,  Liquidated  Damages  shall  cease  to  accrue  as a  result  of  the
Registration  Default.  Notwithstanding  the  foregoing,  at no time  shall  the
maximum  interest  rate  borne by the Notes  exceed 10 1/4%,  which  rate is two
percentage points greater than the per annum interest rate borne by the Notes on
the Issue  Date.  At such time as no  Registration  Default is  continuing,  the
interest  rate borne by the Notes (and, if  applicable,  the  Registered  Notes)
shall be reduced by the amount of the Interest Rate Increase and such additional
interest will cease to accrue.  In the event of any Interest Rate Increase,  the
Company will provide notice to the Trustee of such Interest Rate  Increase,  and
will cause the Trustee to provide  appropriate  notice thereof to the Holders of
the Notes (or, if applicable, the Registered Notes).

Section 9.        Rule 144.

                  The Company  agrees that to the extent it shall be required to
do so under the Exchange Act, the Company shall timely file the reports required
to be filed by it under the Exchange Act or the Securities Act  (including,  but
not limited  to, the  reports  under  Section 13 and 15(d) of the  Exchange  Act
referred to in  subparagraph  (c)(1) of Rule 144 under the Securities  Act), and
shall take such further action as any Holder of Transfer  Restricted  Securities
may reasonably  request,  all to the extent required from time to time to enable
such Holder to sell Transfer  Restricted  Securities without  registration under
the  Securities Act within the  limitations  of the exemptions  provided by Rule
144, as such Rule may be amended from time to time,  or any similar or successor
rule or regulation hereafter adopted by the Commission.  Upon the request of any
Holder of Transfer  Restricted  Securities in connection  with the Holder's sale
pursuant  to Rule  144,  the  Company  shall  deliver  to such  Holder a written
statement as to whether it has complied with such requirements.

Section 10.       Miscellaneous.

                  (a) Amendments  and Waivers.  The provisions of this Agreement
         may not be amended,  modified or supplemented,  and waivers or consents
         to departures from the provisions  hereof may not be given,  unless the
         Company has  obtained  the written  consent of Holders of a majority in
         aggregate principal amount of Transfer Restricted Securities;  provided
         that the  provisions of Section 7 of this Agreement may not be amended,
         modified or  supplemented,  and waivers or consents to departures  from
         the  provisions  thereof  may not be  given,  unless  the  Company  has
         obtained  the  written  consent of each  Indemnified  Holder  adversely
         affected thereby.

                  (b) No  Inconsistent  Agreements.  The Company will not, on or
         after the date of this Agreement, enter into any agreement with respect
         to its securities that is  inconsistent  with the rights granted to the
         Holders in this  Agreement or otherwise  conflicts  with the provisions
         hereof.   The  rights   granted  to  the  Holders   hereunder  are  not
         inconsistent  with the rights  granted to the holders of the  Company's
         securities under any agreement in effect on the date hereof.

                                       22
<PAGE>

                  (c) Notices. All notices and other communications provided for
         or  permitted  hereunder  shall be made in  writing  by  hand-delivery,
         first-class mail (registered or certified,  return receipt  requested),
         or courier guaranteeing overnight delivery:

                           (i) if to a Holder,  at the  address set forth on the
                  records of the Registrar  under the Indenture,  with a copy to
                  the Registrar under the Indenture; and

                           (ii) if to the Representative,  the Company or any of
                  the Guarantors, at their respective addresses set forth in the
                  Purchase Agreement.

                           All such notices and  communications  shall be deemed
                  to have been duly given:  at the time  delivered  by hand,  if
                  personally   delivered;   three   Business  Days  after  being
                  deposited in the mail, postage prepaid,  if mailed; and on the
                  day delivered,  if sent by overnight air courier  guaranteeing
                  next day delivery.

                           Copies  of  all  such   notices.   demands  or  other
                  communications  shall be concurrently  delivered by the Person
                  giving the same to the Trustee at the address specified in the
                  Indenture.

                  (d) Successors and Assigns.  This Agreement shall inure to the
         benefit of and be binding  upon the  successors  and assigns of each of
         the parties, including,  without limitation and without the need for an
         express   assignment,   subsequent   Holders  of  Transfer   Restricted
         Securities.

                  (e) Counterparts. This Agreement may be executed in any number
         of  counterparts  and by the parties  hereto in separate  counterparts,
         each of which when so executed  shall be deemed to be an  original  and
         all  of  which  taken  together  shall  constitute  one  and  the  same
         agreement.

                  (f)  Headings.   The  headings  in  this   Agreement  are  for
         convenience of reference  only and shall not limit or otherwise  affect
         the meaning hereof.

                  (g)  Governing  Law. THIS  AGREEMENT  SHALL BE GOVERNED BY AND
         CONSTRUED  IN  ACCORDANCE  WITH THE  LAWS OF THE  STATE OF NEW YORK FOR
         CONTRACTS  MADE AND TO BE FULLY  PERFORMED  IN SUCH  STATE AND  WITHOUT
         REGARD TO THE PRINCIPLES OF CONFLICT OF LAWS THEREOF.

                  (h) Agent for Service; Submission to Jurisdiction. (i) Each of
         the Company and the Guarantors:

                           (x)  irrevocably  submits to the  jurisdiction of any
                  New York State or federal  court  sitting in New York City and
                  any  appellate  court  from  any  thereof  in  any  action  or
                  proceeding arising out of or relating to this Agreement or any
                  other document delivered hereunder;

                                       23
<PAGE>

                           (y) irrevocably  agrees that all claims in respect of
                  any such action or proceeding  may be heard and  determined in
                  such New York State court or in such federal court; and

                           (z)  irrevocably   waives,   to  the  fullest  extent
                  permitted by law, the defense of an inconvenient  forum to the
                  maintenance  of such  action  or  proceeding  and  irrevocably
                  consents,  to the fullest extent  permitted by law, to service
                  of  process  of any of the  aforementioned  courts in any such
                  action or  proceeding  by the  mailing  of copies  thereof  by
                  registered or certified mail, postage prepaid,  to the Company
                  or any of the Guarantors at its address as provided in Section
                  10(c) of this Agreement, such service to become effective five
                  days after such mailing;

                           (ii) Nothing in this  Section  shall affect the right
                  of any  person to serve  legal  process  in any  other  manner
                  permitted  by law or affect  the right of any  person to bring
                  any action or proceeding  against the Company or any Guarantor
                  or their properties in the courts of other jurisdictions.

                  (i)  Severability.  In the  event  that any one or more of the
         provisions   contained  herein,  or  the  application  thereof  in  any
         circumstance, is held invalid, illegal or unenforceable,  the validity,
         legality  and  enforceability  of any such  provision  in  every  other
         respect and the remaining provisions contained herein shall not, to the
         fullest extent permitted by law, be affected or impaired thereby.

                  (j)  Third  Party  Beneficiaries.  Holders  of the  Notes  and
         Registered Notes and each  Indemnified  Holder are intended third party
         beneficiaries  of this  Agreement and this Agreement may be enforced by
         such persons.

                  (k) Entire Agreement. This Agreement,  together with the other
         transaction documents described in the Purchase Agreement,  is intended
         by the parties as a final expression of their agreement and is intended
         to  be  a  complete  and  exclusive  statement  of  the  agreement  and
         understanding  of the parties  hereto in respect of the subject  matter
         contained herein.  There are no restrictions,  promises.  warranties or
         undertakings,  other than those set forth or referred  to herein,  with
         respect to the registration  rights granted by the Company with respect
         to the Transfer Restricted  Securities.  This Agreement  supersedes all
         prior agreements and understandings between the parties with respect to
         such subject matter.


                                       24
<PAGE>








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

                           Very truly yours,

                           IRON MOUNTAIN INCORPORATED


                           By:   /S/  C. Richard Reese
                                 Name:   C. Richard Reese
                                 Title:  Chairman and Chief Executive Officer






                           Iron Mountain  Records  Management,  Inc.,  Criterion
                           Atlantic Property, Inc., HIMSCORP of San Diego, Inc.,
                           Iron  Mountain   Consulting   Services,   Inc.,  Iron
                           Mountain  of  Maryland  LLC,  Iron  Mountain  Records
                           Management  of  Ohio,  Inc.,  Iron  Mountain  Records
                           Management of Michigan,  Inc., Iron Mountain  Records
                           Management  of  San  Antonio,   Inc.,  Iron  Mountain
                           Records  Management  of San  Antonio-FP,  Inc.,  Iron
                           Mountain/Safesite, Inc., IM-AEI Acquisition Corp., IM
                           Billerica,  Inc.,  Arcus Data  Security,  Inc.,  Iron
                           Mountain/National  Underground  Storage,  Inc.,  Iron
                           Mountain  Safe  Deposit   Corporation,   HIMSCORP  of
                           Philadelphia,  Inc.,  HIMSCORP of  Pittsburgh,  Inc.,
                           HIMSCORP  of  New  Orleans,  Inc.,  HIMSCORP  of  Los
                           Angeles, Inc., HIMSCORP of Cleveland,  Inc., HIMSCORP
                           of  Portland,   Inc.,  HIMSCORP  of  Detroit,   Inc.,
                           HIMSCORP of Houston, Inc., Recordkeepers, Inc., Arcus
                           Data Security LLC, DSI  Technology  Escrow  Services,
                           Inc., Iron Mountain Records  Management of Utah, Inc.
                           and Arcus Staffing Resources, Inc.



                           By:   /S/  C. Richard Reese
                                 Name:   C. Richard Reese
                                 Title:  Chairman and Chief Executive Officer






  
<PAGE>



Accepted as of the date first above written:


BEAR, STEARNS & CO. INC.


By:   /S/ Daniel A. Celentano                  
      Name:  Daniel A. Celentano
      Title: Senior Managing Director


CHASE SECURITIES INC.


By:   /S/ David Fass                           
      Name:  David Fass
      Title: Managing Director


BNY CAPITAL MARKETS, INC.


By:   /S/ Bennett Leichman                     
      Name:  Bennett Leichman
      Title: Vice President


FLEET SECURITIES, INC.


By:   /S/  Scott Vallar                        
      Name:  Scott Vallar
      Title: Managing Director


PRUDENTIAL SECURITIES INCORPORATED


By:   /S/ John E. Stuart                       
      Name:  John E. Stuart
      Title: Managing Director


SCOTIA CAPITAL MARKETS (USA) INC.


By:   /S/  Ted Price                           
      Name:  Ted Price
      Title: CEO






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