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3207888
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Patent number 3,207,888
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Issue date Sep 21, 1965
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G06 - COMPUTING CALCULATING COUNTING
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Patent number 2,920,820
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Issue date Jan 12, 1960
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G06 - COMPUTING CALCULATING COUNTING
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2799450
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Patent number 2,799,450
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Issue date Jul 16, 1957
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G06 - COMPUTING CALCULATING COUNTING
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2798667
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Patent number 2,798,667
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Issue date Jul 9, 1957
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G06 - COMPUTING CALCULATING COUNTING