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3541532
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Patent number 3,541,532
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Issue date Nov 17, 1970
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G11 - INFORMATION STORAGE
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3504354
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Patent number 3,504,354
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Issue date Mar 31, 1970
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G11 - INFORMATION STORAGE
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3452333
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Patent number 3,452,333
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Issue date Jun 24, 1969
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G11 - INFORMATION STORAGE
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3434121
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Patent number 3,434,121
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Issue date Mar 18, 1969
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G11 - INFORMATION STORAGE
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3376560
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Patent number 3,376,560
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Issue date Apr 2, 1968
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G11 - INFORMATION STORAGE
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3222655
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Patent number 3,222,655
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Issue date Dec 7, 1965
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G11 - INFORMATION STORAGE
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3182294
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Patent number 3,182,294
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G11 - INFORMATION STORAGE
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3167748
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Patent number 3,167,748
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Issue date Jan 26, 1965
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G11 - INFORMATION STORAGE