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3183175
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Patent number 3,183,175
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Issue date May 11, 1965
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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2158139
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Patent number 2,158,139
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Issue date May 16, 1939
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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1999514
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Patent number 1,999,514
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Issue date Apr 30, 1935
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...