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2940735
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Patent number 2,940,735
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Issue date Jun 14, 1960
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F28 - HEAT EXCHANGE IN GENERAL
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2554130
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Issue date May 22, 1951
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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1912432
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Patent number 1,912,432
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Issue date Jun 6, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1853000
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Patent number 1,853,000
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Issue date Apr 5, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1674131
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Patent number 1,674,131
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Issue date Jun 19, 1928
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B61 - RAILWAYS
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Patent number 826,966
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Issue date Jul 24, 1906
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F28 - HEAT EXCHANGE IN GENERAL