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3309681
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Patent number 3,309,681
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Issue date Mar 14, 1967
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G11 - INFORMATION STORAGE
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3308446
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Patent number 3,308,446
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Issue date Mar 7, 1967
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G11 - INFORMATION STORAGE
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3278912
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Patent number 3,278,912
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Issue date Oct 11, 1966
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G11 - INFORMATION STORAGE
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3171103
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Patent number 3,171,103
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Issue date Feb 23, 1965
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G11 - INFORMATION STORAGE
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3015092
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Patent number 3,015,092
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Issue date Dec 26, 1961
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G06 - COMPUTING CALCULATING COUNTING
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2998594
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Patent number 2,998,594
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Issue date Aug 29, 1961
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G11 - INFORMATION STORAGE
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2988732
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Patent number 2,988,732
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Issue date Jun 13, 1961
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G11 - INFORMATION STORAGE
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2960685
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Patent number 2,960,685
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Issue date Nov 15, 1960
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G11 - INFORMATION STORAGE