EXHIBIT 4.1 FORM OF 6 3/8% DEBENTURES DUE 2028 [Face of Debenture] Unless this certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation ("DTC"), to the Issuer or its agent for registration of transfer, exchange or payment, and any certificate issued is registered in the name of Cede & Co. or in such other name as requested by an authorized representative of DTC (and any payment is made to Cede & Co. or such other entity as is requested by an authorized representative of DTC), 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. CUSIP NO. 604059 AE 5 PRINCIPAL AMOUNT: $200,000,000 REGISTERED NO. 1 MINNESOTA MINING AND MANUFACTURING COMPANY 6 3/8% DEBENTURES DUE 2028 Minnesota Mining and Manufacturing Company, a corporation duly organized and existing under the laws of the State of Delaware (hereinafter called the "Company", which term includes any successor corporation under the Indenture hereinafter referred to), for value received, hereby promises to pay to CEDE & Co., or registered assigns, the principal sum of Two Hundred Million Dollars ($200,000,000) on February 15, 2028 and to pay interest thereon from February 18, 1998 or from the most recent Interest Payment Date to which interest has been paid or duly provided for semi-annually on February 15 and August 15 of each year commencing August 15, 1998 at the rate of 6 3/8% per annum, until the principal hereof is paid or made available for payment. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in the Indenture, be paid to the Person in whose name this Security (or one or more Predecessor Securities) is registered at the close of business on the Regular Record Date for such interest, which shall be the February 1 or August 1 (whether or not a Business Day), as the case may be, next preceding such Interest Payment Date. Any interest not punctually paid or duly provided for will forthwith cease to be payable to the Holder on such Regular Record Date and may either be paid to the Person in whose name this Security (or one or more Predecessor Securities) is registered at the close of business on a Special Record Date for the payment of such Defaulted Interest to be fixed by the Trustee, notice whereof shall be given to Holders of Securities of this series not less than 10 days prior to such Special Record Date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Securities of this series may be listed, and upon such notice as may be required by such exchange, all as more fully provided in the Indenture. Payment of interest on this Security will be made at the office or agency of the Company maintained for that purpose in the Borough of Manhattan, The City of New York, in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts; provided, however, that, at the option of the Company, payment of interest may be paid by check mailed to the Person entitled thereto at such Person's last address as it appears in the Security Register or by wire transfer to such account as may have been designated by such Person. Payment of principal of and interest on this Security at Maturity will be made against presentation of this Security at the office or agency of the Company maintained for that purpose in the Borough of Manhattan, The City of New York. Reference is hereby made to the further provisions of this Security set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as if set forth at this place. Unless the certificate of authentication hereon has been executed by the Trustee referred to on the reverse hereof by manual signature, this Security shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose. IN WITNESS WHEREOF, the Company has caused this instrument to be signed by its duly authorized officer, and has caused a facsimile of its corporate seal to be affixed hereto or imprinted herein. DATED: February 18, 1998 MINNESOTA MINING AND MANUFACTURING COMPANY By: ------------------------------------- Giulio Agostiri Senior Vice President, Finance and Administrative Services [SEAL] Attest: ---------------------------- Janet L. Yeomans Vice President and Treasurer TRUSTEE'S CERTIFICATE OF AUTHENTICATION This is one of the Securities of the series designated therein referred to in the within-mentioned Indenture. CITIBANK, N.A., as Trustee By: ------------------------------------ Authorized Signatory [Reverse of Debenture] MINNESOTA MINING AND MANUFACTURING COMPANY 6 3/8% DEBENTURES DUE 2028 This Security is one of a duly authorized issue of securities of the Company (herein called the "Securities"), issued and to be issued in one or more series under an indenture dated as of June 1, 1989, as amended or supplemented from time to time (herein called the "Indenture"), between the Company and Citibank, N.A., as Trustee (herein called the "Trustee", which term includes any successor trustee under the Indenture), to which Indenture and all indentures supplemental thereto reference is hereby made for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Trustee and the Holders of the Securities, and of the terms upon which the Securities are, and are to be, authenticated and delivered. This Security is one of the series designated on the face hereof, limited in aggregate principal amount to $330,000,000. The Securities will be redeemable as a whole or in part, at the option of the Company at any time (a "Company Redemption Date"), at a redemption price equal to the greater of (i) 100% of the principal amount of the Securities to be redeemed or (ii) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the Company Redemption Date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 10 basis points, plus, in either case, accrued and unpaid interest on the principal amount being redeemed to the Company Redemption Date. "Treasury Rate" means, with respect to any Company Redemption Date, the rate per annum equal to the semi-annual equivalent yield to maturity of the Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for such Company Redemption Date. "Comparable Treasury Issue" means the United States Treasury security selected by an Independent Investment Banker as having a maturity comparable to the remaining terms of the Securities to be redeemed that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of the Securities. "Independent Investment Banker" means one of the Reference Treasury Dealers appointed by the Trustee after consultation with the Company. "Comparable Treasury Price" means, with respect to any Company Redemption Date, (i) the average of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) on the third business day preceding such Company Redemption Date, as set forth in the daily statistical release (or any successor release) published by the Federal Reserve Bank of New York and designated "Composite 3:30 p.m. Quotations for U.S. Government Securities" or (ii) if such release (or any successor release) is not published or does not contain such prices on such business day, (A) the average of the Reference Treasury Dealer Quotations for such Company Redemption Date, after excluding the highest and lowest such Reference Treasury Dealer Quotations, or (B) if the Trustee obtains fewer than four such Reference Treasury Dealer Quotations, the average of all such Quotations. "Reference Treasury Dealer Quotations" means, with respect to each Reference Treasury Dealer and any Company Redemption Date, the average, as determined by the Trustee, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the Trustee by such Reference Treasury Dealer at 5:00 p.m. on the third business day preceding such Company Redemption Date. "Reference Treasury Dealer" means Merrill Lynch, Pierce, Fenner & Smith Incorporated and any additional reference dealers appointed by the Company at the sole discretion of the Company, and their respective successors; provided, however, that if any of the foregoing shall cease to be a primary U.S. Government securities dealer in New York City (a "Primary Treasury Dealer"), the Company will substitute therefor another Primary Treasury Dealer. Notice of any redemption by the Company will be mailed at least 30 days but not more than 60 days before any Company Redemption Date to each holder of Securities to be redeemed. Unless the Company defaults in payment of the redemption price, on and after any Company Redemption Date interest will cease to accrue on the Securities or portions thereof called for redemption. The Securities will not be entitled to any sinking fund. If an Event of Default, as defined in the Indenture, with respect to Securities of this series shall occur and be continuing, the principal of the Securities of this series may be declared due and payable in the manner and with the effect provided in the Indenture. The Indenture permits, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company and the rights of the Holders of the Securities of each series to be affected under the Indenture at any time by the Company and the Trustee with the consent of the Holders of not less than 66 2/3% in principal amount of the Securities at the time Outstanding of each series to be affected. The Indenture also contains provisions permitting the Holders of specified percentages in principal amount of the Securities of each series at the time Outstanding, on behalf of the Holders of all Securities of such series, to waive compliance by the Company with certain provisions of the Indenture and certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder of this Security shall be conclusive and binding upon such Holder and upon all future Holders of this Security and of any Security issued upon the registration of transfer hereof or in exchange hereof or in lieu hereof, whether or not notation of such consent or waiver is made upon this Security. Upon due presentment for registration of transfer of this Security at the office or agency of the Company in the Borough of Manhattan, The City of New York, a new Security or Securities of this series in authorized denominations for an equal aggregate principal amount will be issued to the transferee in exchange hereof, as provided in the Indenture and subject to the limitations provided therein and to the limitations described below, without charge except for any tax or other governmental charge imposed in connection therewith. This Security is exchangeable for definitive Securities in registered form only if (x) the Depositary notifies the Company that it is unwilling or unable to continue as Depositary for this Security or if at any time the Depositary ceases to be a clearing agency registered under the Securities Exchange Act of 1934, as amended, (y) the Company in its sole discretion determines that this Security shall be exchangeable for definitive Securities in registered form and notifies the Trustee thereof or (z) an Event of Default with respect to the Securities represented hereby has occurred and is continuing. If this Security is exchangeable pursuant to the preceding sentence, it shall be exchangeable for definitive Securities in registered form, bearing interest at the same rate, having the same date of issuance, redemption provisions, Stated Maturity and other terms and of authorized denominations aggregating a like amount. This Security may not be transferred except as a whole by 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 of the Depositary or a nominee of such successor. Except as provided above, owners of beneficial interests in this global Security will not be entitled to receive physical delivery of Securities in definitive form and will not be considered the Holders hereof for any purpose under the Indenture. No reference herein to the Indenture and no provision of this Security or of the Indenture shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of and interest on this Security at the times, place and rate, and in the coin or currency, herein prescribed. Prior to due presentment of this Security for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the Person in whose name this Security is registered as the owner hereof for all purposes, whether or not this Security be overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary. No recourse shall be had for the payment of the principal of or the interest on this Security, or for any claim based hereon, or otherwise in respect hereof, or based on or in respect of the Indenture or any indenture supplemental thereto, against any incorporator, stockholder, officer or director, as such, past, present or future, of the Company or any successor corporation, whether by virtue of any constitution, statute or rule of law, or by the enforcement of any assessment or penalty or otherwise, all such liability being, by the acceptance hereof and as part of the consideration for the issuance hereof, expressly waived and released. All terms used in this Security which are defined in the Indenture shall have the meanings assigned to them in the Indenture. ABBREVIATIONS The following abbreviations, when used in the inscription on the face of this instrument, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM -- as tenants in common TEN ENT -- as tenants by the entireties JT TEN -- as joint tenants with right of survivorship and not as tenants in common UNIF GIFT MIN ACT -- _____________________ Custodian _________________________ (Cust) (Minor) Under Uniform Gifts to Minors Act - --------------------------------- (State) Additional abbreviations may also be used though not in the above list. FOR VALUE RECEIVED, the undersigned hereby sell(s) and transfer(s) unto Please Insert Social Security or Other Identifying Number of Assignee - --------------------------------- - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- (PLEASE PRINT OR TYPE NAME AND ADDRESS INCLUDING POSTAL ZIP CODE OF ASSIGNEE) the within Security of MINNESOTA MINING AND MANUFACTURING COMPANY and does hereby irrevocably constitute and appoint __________________ attorney to transfer the said Security on the books of the Company, with full power of substitution in the premises. Dated: ------------------------- --------------------------------------- --------------------------------------- NOTICE: The signature to this assignment must correspond with the name as written upon the face of the within instrument in every particular, without alteration or enlargement or any change whatever.