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3078100
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Patent number 3,078,100
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Issue date Feb 19, 1963
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G11 - INFORMATION STORAGE
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2972484
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Patent number 2,972,484
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Issue date Feb 21, 1961
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G11 - INFORMATION STORAGE
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2676807
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Patent number 2,676,807
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Issue date Apr 27, 1954
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G11 - INFORMATION STORAGE
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2545363
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Patent number 2,545,363
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Issue date Mar 13, 1951
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G11 - INFORMATION STORAGE
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2434033
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Patent number 2,434,033
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Issue date Jan 6, 1948
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G11 - INFORMATION STORAGE