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This excerpt taken from the SIAL 10-Q filed Nov 8, 2006. Item 6. Exhibits (a) Exhibits 3 (a) Certificate of Incorporation, as Amended Incorporated by reference to Exhibit 3(a) of Form 10-Q filed for the period ended June 30, 2004, Commission File number 0-8135 (b) By-Laws, as amended - Incorporated by reference to Exhibit 3(b) of Form 10-Q for the quarter ended September 30, 2003, Commission File number 0-8135. 4 (a) Rights Agreement, dated as of August 8, 2000 between Sigma-Aldrich Corporation and Computershare Investor Services, LLC, as Rights Agent, which includes the form of Rights Certificate as Exhibit A and the Summary of Common Stock Purchase Rights as Exhibit B. Incorporated by reference to Exhibit 1 of Form 8-A12(g) filed on August 10, 2000, Commission File number 0-8135. 31.1 CEO Certification pursuant to Exchange Act Rule 13a-14(a). 31.2 CFO Certification pursuant to Exchange Act Rule 13a-14(a). 32.1 CEO Certification pursuant to 18 U.S.C. Section 1350 and Exchange Act Rule 13a-14(b). 32.2 CFO Certification pursuant to 18 U.S.C. Section 1350 and Exchange Act Rule 13a-14(b).
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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 thereunto duly authorized. SIGMA-ALDRICH CORPORATION (Registrant)
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