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1809538
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Patent number 1,809,538
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Issue date Jun 9, 1931
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F24 - HEATING RANGES VENTILATING
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756970
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Patent number 756,970
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Issue date Apr 12, 1904
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F24 - HEATING RANGES VENTILATING
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730386
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Patent number 730,386
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Issue date Jun 9, 1903
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F24 - HEATING RANGES VENTILATING
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705110
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Patent number 705,110
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Issue date Jul 22, 1902
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F24 - HEATING RANGES VENTILATING
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635735
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Patent number 635,735
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Issue date Oct 31, 1899
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F28 - HEAT EXCHANGE IN GENERAL
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621115
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Patent number 621,115
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Issue date Mar 14, 1899
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F24 - HEATING RANGES VENTILATING
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608360
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Patent number 608,360
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Issue date Aug 2, 1898
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F28 - HEAT EXCHANGE IN GENERAL
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564464
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Patent number 564,464
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Issue date Jul 21, 1896
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F24 - HEATING RANGES VENTILATING
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543560
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Patent number 543,560
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Issue date Jul 30, 1895
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F28 - HEAT EXCHANGE IN GENERAL
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398115
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Patent number 398,115
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Issue date Feb 19, 1889
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F28 - HEAT EXCHANGE IN GENERAL
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391541
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Patent number 391,541
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Issue date Oct 23, 1888
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F24 - HEATING RANGES VENTILATING
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365391
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Patent number 365,391
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Issue date Jun 28, 1887
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F24 - HEATING RANGES VENTILATING
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344414
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Patent number 344,414
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Issue date Jun 29, 1886
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F24 - HEATING RANGES VENTILATING
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318541
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Patent number 318,541
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Issue date May 19, 1885
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F24 - HEATING RANGES VENTILATING
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242406
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Patent number 242,406
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Issue date May 31, 1881
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F24 - HEATING RANGES VENTILATING
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204475
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Patent number 204,475
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Issue date Jun 4, 1878
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F24 - HEATING RANGES VENTILATING
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194590
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Patent number 194,590
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Issue date Aug 28, 1877
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F24 - HEATING RANGES VENTILATING
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187274
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Patent number 187,274
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Issue date Feb 13, 1877
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F24 - HEATING RANGES VENTILATING
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174393
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Patent number 174,393
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Issue date Mar 7, 1876
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F24 - HEATING RANGES VENTILATING
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171378
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Patent number 171,378
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Issue date Dec 21, 1875
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F28 - HEAT EXCHANGE IN GENERAL
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165517
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Patent number 165,517
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Issue date Jul 13, 1875
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F24 - HEATING RANGES VENTILATING
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159888
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Patent number 159,888
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Issue date Feb 16, 1875
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F24 - HEATING RANGES VENTILATING
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140999
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Patent number 140,999
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Issue date Jul 22, 1873
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F24 - HEATING RANGES VENTILATING
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102053
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Patent number 102,053
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Issue date Apr 19, 1870
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F24 - HEATING RANGES VENTILATING
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85196
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Patent number 85,196
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Issue date Dec 22, 1868
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F24 - HEATING RANGES VENTILATING
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84989
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Patent number 84,989
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Issue date Dec 15, 1868
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F28 - HEAT EXCHANGE IN GENERAL
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80076
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Patent number 80,076
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Issue date Jul 21, 1868
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F28 - HEAT EXCHANGE IN GENERAL
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76564
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Patent number 76,564
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Issue date Apr 7, 1868
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F28 - HEAT EXCHANGE IN GENERAL
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62627
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Patent number 62,627
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Issue date Mar 5, 1867
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F24 - HEATING RANGES VENTILATING
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57778
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Patent number 57,778
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Issue date Sep 4, 1866
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F28 - HEAT EXCHANGE IN GENERAL