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1551076
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Patent number 1,551,076
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Issue date Aug 25, 1925
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F28 - HEAT EXCHANGE IN GENERAL
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1141200
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Patent number 1,141,200
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Issue date Jun 1, 1915
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F24 - HEATING RANGES VENTILATING
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809486
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Patent number 809,486
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Issue date Jan 9, 1906
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F24 - HEATING RANGES VENTILATING
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727668
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Patent number 727,668
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Issue date May 12, 1903
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F28 - HEAT EXCHANGE IN GENERAL
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656230
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Patent number 656,230
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Issue date Aug 21, 1900
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F24 - HEATING RANGES VENTILATING
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525990
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Patent number 525,990
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Issue date Sep 11, 1894
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F24 - HEATING RANGES VENTILATING
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451944
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Patent number 451,944
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Issue date May 12, 1891
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F24 - HEATING RANGES VENTILATING
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395013
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Patent number 395,013
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Issue date Dec 25, 1888
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F24 - HEATING RANGES VENTILATING
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374284
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Patent number 374,284
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Issue date Dec 6, 1887
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F28 - HEAT EXCHANGE IN GENERAL
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374436
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Patent number 374,436
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Issue date Dec 6, 1887
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F24 - HEATING RANGES VENTILATING
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314413
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Patent number 314,413
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Issue date Mar 24, 1885
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F24 - HEATING RANGES VENTILATING
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281219
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Patent number 281,219
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Issue date Jul 10, 1883
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F24 - HEATING RANGES VENTILATING
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272048
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Patent number 272,048
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Issue date Feb 13, 1883
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F24 - HEATING RANGES VENTILATING
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248049
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Patent number 248,049
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Issue date Oct 11, 1881
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F28 - HEAT EXCHANGE IN GENERAL
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210933
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Patent number 210,933
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Issue date Dec 17, 1878
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F28 - HEAT EXCHANGE IN GENERAL
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205953
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Patent number 205,953
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Issue date Jul 16, 1878
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F24 - HEATING RANGES VENTILATING
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188622
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Patent number 188,622
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Issue date Mar 20, 1877
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F24 - HEATING RANGES VENTILATING
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187534
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Patent number 187,534
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Issue date Feb 20, 1877
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F24 - HEATING RANGES VENTILATING
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140939
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Patent number 140,939
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Issue date Jul 15, 1873
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F24 - HEATING RANGES VENTILATING
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140454
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Patent number 140,454
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Issue date Jul 1, 1873
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F24 - HEATING RANGES VENTILATING
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73842
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Patent number 73,842
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Issue date Jan 28, 1868
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F24 - HEATING RANGES VENTILATING
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62699
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Patent number 62,699
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Issue date Mar 5, 1867
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F24 - HEATING RANGES VENTILATING
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47887
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Patent number 47,887
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Issue date May 23, 1865
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F28 - HEAT EXCHANGE IN GENERAL
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47535
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Patent number 47,535
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Issue date May 2, 1865
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F24 - HEATING RANGES VENTILATING
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45404
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Patent number 45,404
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Issue date Dec 13, 1864
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F24 - HEATING RANGES VENTILATING
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44197
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Patent number 44,197
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Issue date Sep 13, 1864
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F24 - HEATING RANGES VENTILATING