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3897955
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Patent number 3,897,955
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Issue date Aug 5, 1975
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G11 - INFORMATION STORAGE
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3417999
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Patent number 3,417,999
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Issue date Dec 24, 1968
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G11 - INFORMATION STORAGE
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3384380
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Patent number 3,384,380
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Issue date May 21, 1968
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G11 - INFORMATION STORAGE
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2906537
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Patent number 2,906,537
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Issue date Sep 29, 1959
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G11 - INFORMATION STORAGE
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2660437
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Patent number 2,660,437
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Issue date Nov 24, 1953
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G11 - INFORMATION STORAGE