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3394199
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Patent number 3,394,199
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Issue date Jul 23, 1968
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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3316318
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Patent number 3,316,318
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Issue date Apr 25, 1967
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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3190830
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Patent number 3,190,830
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Issue date Jun 22, 1965
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C07 - ORGANIC CHEMISTRY