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1494721
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Patent number 1,494,721
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Issue date May 20, 1924
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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1459576
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Patent number 1,459,576
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Issue date Jun 19, 1923
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...