摘要：

Nov. 26, 1968 w. K. FRENCH TAMPER-PROOF RECORD STRUCTURE Filed May 2, 1966 United States Patent 3,412,493 TAMPER-PROOF RECORD STRUCTURE Walter K. French, Montrose, N.Y., assignor to International Business Machines Corporation, Armonk, N.Y., a corporation of New York Filed May 2, 1966, Ser. No. 546,793 7 Claims. (Cl. 402.2)

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