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2239412
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Patent number 2,239,412
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Issue date Apr 22, 1941
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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1438725
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Patent number 1,438,725
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Issue date Dec 12, 1922
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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1378782
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Patent number 1,378,782
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Issue date May 17, 1921
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...