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2223897
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Patent number 2,223,897
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Issue date Dec 3, 1940
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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1749641
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Patent number 1,749,641
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Issue date Mar 4, 1930
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...