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2028349
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Patent number 2,028,349
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Issue date Jan 21, 1936
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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1998350
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Patent number 1,998,350
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Issue date Apr 16, 1935
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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1657380
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Patent number 1,657,380
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Issue date Jan 24, 1928
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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1619964
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Patent number 1,619,964
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Issue date Mar 8, 1927
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...