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1911197
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Patent number 1,911,197
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Issue date May 30, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1895075
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Patent number 1,895,075
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Issue date Jan 24, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1721149
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Patent number 1,721,149
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Issue date Jul 16, 1929
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F28 - HEAT EXCHANGE IN GENERAL
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1111242
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Patent number 1,111,242
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Issue date Sep 22, 1914
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F28 - HEAT EXCHANGE IN GENERAL
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1039927
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Patent number 1,039,927
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Issue date Oct 1, 1912
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F28 - HEAT EXCHANGE IN GENERAL
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898932
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Patent number 898,932
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Issue date Sep 15, 1908
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F28 - HEAT EXCHANGE IN GENERAL
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601368
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Patent number 601,368
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Issue date Mar 29, 1898
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F28 - HEAT EXCHANGE IN GENERAL
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551489
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Patent number 551,489
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Issue date Dec 17, 1895
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F28 - HEAT EXCHANGE IN GENERAL
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538519
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Patent number 538,519
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Issue date Apr 30, 1895
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F24 - HEATING RANGES VENTILATING
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525931
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Patent number 525,931
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Issue date Sep 11, 1894
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F28 - HEAT EXCHANGE IN GENERAL
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488764
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Patent number 488,764
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Issue date Dec 27, 1892
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F28 - HEAT EXCHANGE IN GENERAL
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476794
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Patent number 476,794
-
Issue date Jun 14, 1892
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F28 - HEAT EXCHANGE IN GENERAL
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444078
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Patent number 444,078
-
Issue date Jan 6, 1891
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F28 - HEAT EXCHANGE IN GENERAL
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416601
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Patent number 416,601
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Issue date Dec 3, 1889
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F28 - HEAT EXCHANGE IN GENERAL
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403349
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Patent number 403,349
-
Issue date May 14, 1889
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F28 - HEAT EXCHANGE IN GENERAL
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260512
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Patent number 260,512
-
Issue date Jul 4, 1882
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F28 - HEAT EXCHANGE IN GENERAL
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205018
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Patent number 205,018
-
Issue date Jun 18, 1878
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F28 - HEAT EXCHANGE IN GENERAL
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167129
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Patent number 167,129
-
Issue date Aug 24, 1875
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F28 - HEAT EXCHANGE IN GENERAL
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147794
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Patent number 147,794
-
Issue date Feb 24, 1874
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F28 - HEAT EXCHANGE IN GENERAL
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117675
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Patent number 117,675
-
Issue date Aug 1, 1871
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F28 - HEAT EXCHANGE IN GENERAL
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97915
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Patent number 97,915
-
Issue date Dec 14, 1869
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F28 - HEAT EXCHANGE IN GENERAL
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86362
-
Patent number 86,362
-
Issue date Feb 2, 1869
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F28 - HEAT EXCHANGE IN GENERAL
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66369
-
Patent number 66,369
-
Issue date Jul 2, 1867
-
F28 - HEAT EXCHANGE IN GENERAL
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64293
-
Patent number 64,293
-
Issue date Apr 30, 1867
-
F24 - HEATING RANGES VENTILATING
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53029
-
Patent number 53,029
-
Issue date Mar 6, 1866
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F28 - HEAT EXCHANGE IN GENERAL
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46941
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Patent number 46,941
-
Issue date Mar 21, 1865
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F28 - HEAT EXCHANGE IN GENERAL
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36068
-
Patent number 36,068
-
Issue date Aug 5, 1862
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F28 - HEAT EXCHANGE IN GENERAL
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28493
-
Patent number 28,493
-
Issue date May 29, 1860
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F28 - HEAT EXCHANGE IN GENERAL
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9690
-
Patent number 9,690
-
Issue date Apr 26, 1853
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F28 - HEAT EXCHANGE IN GENERAL