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977666
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Patent number 977,666
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Issue date Dec 6, 1910
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F28 - HEAT EXCHANGE IN GENERAL
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800002
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Patent number 800,002
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Issue date Sep 19, 1905
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F28 - HEAT EXCHANGE IN GENERAL
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756202
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Patent number 756,202
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Issue date Apr 5, 1904
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F28 - HEAT EXCHANGE IN GENERAL
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474694
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Patent number 474,694
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Issue date May 10, 1892
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F28 - HEAT EXCHANGE IN GENERAL
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451375
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Patent number 451,375
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Issue date Apr 28, 1891
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F28 - HEAT EXCHANGE IN GENERAL
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436452
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Patent number 436,452
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Issue date Sep 16, 1890
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F28 - HEAT EXCHANGE IN GENERAL
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387715
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Patent number 387,715
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Issue date Aug 14, 1888
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F28 - HEAT EXCHANGE IN GENERAL
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162100
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Patent number 162,100
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Issue date Apr 13, 1875
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F28 - HEAT EXCHANGE IN GENERAL
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92114
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Patent number 92,114
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Issue date Jun 29, 1869
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F28 - HEAT EXCHANGE IN GENERAL
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67251
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Patent number 67,251
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Issue date Jul 30, 1867
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F28 - HEAT EXCHANGE IN GENERAL