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3849768
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Patent number 3,849,768
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Issue date Nov 19, 1974
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G11 - INFORMATION STORAGE
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3474426
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Patent number 3,474,426
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Issue date Oct 21, 1969
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G11 - INFORMATION STORAGE
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3471516
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Patent number 3,471,516
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Issue date Oct 7, 1969
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G11 - INFORMATION STORAGE
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3372385
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Patent number 3,372,385
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Issue date Mar 5, 1968
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G06 - COMPUTING CALCULATING COUNTING
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3366940
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Patent number 3,366,940
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Issue date Jan 30, 1968
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G11 - INFORMATION STORAGE
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3264713
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Patent number 3,264,713
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Issue date Aug 9, 1966
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G11 - INFORMATION STORAGE
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3054092
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Patent number 3,054,092
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Issue date Sep 11, 1962
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G11 - INFORMATION STORAGE
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2884621
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Patent number 2,884,621
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Issue date Apr 28, 1959
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G11 - INFORMATION STORAGE