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3909517
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Patent number 3,909,517
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Issue date Sep 30, 1975
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G11 - INFORMATION STORAGE
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3842217
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Patent number 3,842,217
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Issue date Oct 15, 1974
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G11 - INFORMATION STORAGE
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3842194
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Patent number 3,842,194
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Issue date Oct 15, 1974
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G11 - INFORMATION STORAGE
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3833408
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Patent number 3,833,408
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Issue date Sep 3, 1974
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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3806668
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Patent number 3,806,668
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Issue date Apr 23, 1974
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3783196
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Patent number 3,783,196
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Issue date Jan 1, 1974
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G11 - INFORMATION STORAGE