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3402031
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Patent number 3,402,031
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Issue date Sep 17, 1968
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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1893417
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Patent number 1,893,417
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Issue date Jan 3, 1933
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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1589561
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Patent number 1,589,561
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Issue date Jun 22, 1926
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...