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3624621
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Patent number 3,624,621
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Issue date Nov 30, 1971
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G11 - INFORMATION STORAGE
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3509552
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Patent number 3,509,552
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Issue date Apr 28, 1970
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G11 - INFORMATION STORAGE
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3435426
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Patent number 3,435,426
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Issue date Mar 25, 1969
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G11 - INFORMATION STORAGE
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3428956
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Patent number 3,428,956
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Issue date Feb 18, 1969
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G11 - INFORMATION STORAGE
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3307161
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Patent number 3,307,161
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Issue date Feb 28, 1967
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G11 - INFORMATION STORAGE
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3268876
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Patent number 3,268,876
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Issue date Aug 23, 1966
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G11 - INFORMATION STORAGE
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3267446
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Patent number 3,267,446
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G11 - INFORMATION STORAGE
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3259888
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Patent number 3,259,888
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G11 - INFORMATION STORAGE
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3238517
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Patent number 3,238,517
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G11 - INFORMATION STORAGE
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Patent number 3,222,656
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G11 - INFORMATION STORAGE
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3142048
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G11 - INFORMATION STORAGE
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G11 - INFORMATION STORAGE
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3126532
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G11 - INFORMATION STORAGE
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3069661
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Patent number 3,069,661
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G11 - INFORMATION STORAGE
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3056118
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Patent number 3,056,118
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G11 - INFORMATION STORAGE