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3870320
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Patent number 3,870,320
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Issue date Mar 11, 1975
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G11 - INFORMATION STORAGE
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3540739
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Patent number 3,540,739
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Issue date Nov 17, 1970
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G11 - INFORMATION STORAGE
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3425701
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Patent number 3,425,701
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Issue date Feb 4, 1969
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G11 - INFORMATION STORAGE
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3409303
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Patent number 3,409,303
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Issue date Nov 5, 1968
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G11 - INFORMATION STORAGE
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3129946
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Patent number 3,129,946
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Issue date Apr 21, 1964
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G11 - INFORMATION STORAGE