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3866192
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Patent number 3,866,192
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Issue date Feb 11, 1975
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G11 - INFORMATION STORAGE
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3852725
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Patent number 3,852,725
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Issue date Dec 3, 1974
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G11 - INFORMATION STORAGE
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3832766
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Patent number 3,832,766
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Issue date Sep 3, 1974
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G11 - INFORMATION STORAGE
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3824566
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Patent number 3,824,566
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Issue date Jul 16, 1974
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G11 - INFORMATION STORAGE
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3803565
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Patent number 3,803,565
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Issue date Apr 9, 1974
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G11 - INFORMATION STORAGE
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3789376
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Patent number 3,789,376
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Issue date Jan 29, 1974
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G11 - INFORMATION STORAGE
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3786450
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Patent number 3,786,450
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Issue date Jan 15, 1974
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G11 - INFORMATION STORAGE
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3771220
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Patent number 3,771,220
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Issue date Nov 13, 1973
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G11 - INFORMATION STORAGE
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3768155
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Patent number 3,768,155
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Issue date Oct 30, 1973
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G11 - INFORMATION STORAGE