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1978639
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Patent number 1,978,639
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F28 - HEAT EXCHANGE IN GENERAL
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1492696
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A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
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1431400
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Patent number 1,431,400
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A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
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1248179
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Patent number 1,248,179
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Issue date Nov 27, 1917
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F28 - HEAT EXCHANGE IN GENERAL
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1172877
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Patent number 1,172,877
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F28 - HEAT EXCHANGE IN GENERAL
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1089692
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Patent number 1,089,692
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F28 - HEAT EXCHANGE IN GENERAL
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995129
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Patent number 995,129
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F28 - HEAT EXCHANGE IN GENERAL
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955481
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Patent number 955,481
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F28 - HEAT EXCHANGE IN GENERAL
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888048
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Patent number 888,048
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F28 - HEAT EXCHANGE IN GENERAL
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673180
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Patent number 673,180
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F28 - HEAT EXCHANGE IN GENERAL
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640122
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F28 - HEAT EXCHANGE IN GENERAL
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553437
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F28 - HEAT EXCHANGE IN GENERAL
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373242
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F28 - HEAT EXCHANGE IN GENERAL
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292949
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Patent number 292,949
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F28 - HEAT EXCHANGE IN GENERAL
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250694
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Patent number 250,694
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F28 - HEAT EXCHANGE IN GENERAL
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106686
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Patent number 106,686
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F28 - HEAT EXCHANGE IN GENERAL
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77732
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F28 - HEAT EXCHANGE IN GENERAL
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55071
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F28 - HEAT EXCHANGE IN GENERAL