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3487374
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Patent number 3,487,374
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Issue date Dec 30, 1969
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G11 - INFORMATION STORAGE
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3448211
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Patent number 3,448,211
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Issue date Jun 3, 1969
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G02 - OPTICS
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3293627
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Patent number 3,293,627
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Issue date Dec 20, 1966
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G11 - INFORMATION STORAGE
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2856462
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Patent number 2,856,462
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Issue date Oct 14, 1958
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G11 - INFORMATION STORAGE