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3430005
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Patent number 3,430,005
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Issue date Feb 25, 1969
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G11 - INFORMATION STORAGE
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3373997
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Patent number 3,373,997
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Issue date Mar 19, 1968
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G11 - INFORMATION STORAGE
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2721906
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Patent number 2,721,906
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Issue date Oct 25, 1955
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G11 - INFORMATION STORAGE
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2517440
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Patent number 2,517,440
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Issue date Aug 1, 1950
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G11 - INFORMATION STORAGE