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3872505
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Patent number 3,872,505
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Issue date Mar 18, 1975
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G11 - INFORMATION STORAGE
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3816851
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Patent number 3,816,851
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Issue date Jun 11, 1974
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G11 - INFORMATION STORAGE
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3810239
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Patent number 3,810,239
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Issue date May 7, 1974
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G11 - INFORMATION STORAGE
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3774915
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Patent number 3,774,915
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Issue date Nov 27, 1973
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G11 - INFORMATION STORAGE
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3749410
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Patent number 3,749,410
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Issue date Jul 31, 1973
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G11 - INFORMATION STORAGE
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3682483
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Patent number 3,682,483
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Issue date Aug 8, 1972
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G11 - INFORMATION STORAGE
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3643962
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Patent number 3,643,962
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Issue date Feb 22, 1972
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G11 - INFORMATION STORAGE
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3127179
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Patent number 3,127,179
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Issue date Mar 31, 1964
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G11 - INFORMATION STORAGE
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3127178
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Patent number 3,127,178
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Issue date Mar 31, 1964
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G11 - INFORMATION STORAGE