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1953324
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Patent number 1,953,324
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Issue date Apr 3, 1934
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F28 - HEAT EXCHANGE IN GENERAL
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1947913
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Patent number 1,947,913
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Issue date Feb 20, 1934
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F28 - HEAT EXCHANGE IN GENERAL
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1927079
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Patent number 1,927,079
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Issue date Sep 19, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1894436
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Patent number 1,894,436
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Issue date Jan 17, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1888545
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Patent number 1,888,545
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Issue date Nov 22, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1880248
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Patent number 1,880,248
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Issue date Oct 4, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1855644
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Patent number 1,855,644
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Issue date Apr 26, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1818226
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Patent number 1,818,226
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Issue date Aug 11, 1931
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F28 - HEAT EXCHANGE IN GENERAL
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1747159
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Patent number 1,747,159
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Issue date Feb 18, 1930
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F28 - HEAT EXCHANGE IN GENERAL
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1635656
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Patent number 1,635,656
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Issue date Jul 12, 1927
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F28 - HEAT EXCHANGE IN GENERAL
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1607171
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Patent number 1,607,171
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Issue date Nov 16, 1926
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F28 - HEAT EXCHANGE IN GENERAL
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1607172
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Patent number 1,607,172
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Issue date Nov 16, 1926
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F28 - HEAT EXCHANGE IN GENERAL
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1385450
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Patent number 1,385,450
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Issue date Jul 26, 1921
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F28 - HEAT EXCHANGE IN GENERAL
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1371031
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Patent number 1,371,031
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Issue date Mar 8, 1921
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F28 - HEAT EXCHANGE IN GENERAL
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1370406
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Patent number 1,370,406
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Issue date Mar 1, 1921
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F28 - HEAT EXCHANGE IN GENERAL
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1329198
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Patent number 1,329,198
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Issue date Jan 27, 1920
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F28 - HEAT EXCHANGE IN GENERAL
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1057404
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Patent number 1,057,404
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Issue date Apr 1, 1913
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F24 - HEATING RANGES VENTILATING
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828937
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Patent number 828,937
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Issue date Aug 21, 1906
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F28 - HEAT EXCHANGE IN GENERAL
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731224
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Patent number 731,224
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Issue date Jun 16, 1903
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F28 - HEAT EXCHANGE IN GENERAL
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565495
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Patent number 565,495
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Issue date Aug 11, 1896
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F28 - HEAT EXCHANGE IN GENERAL
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446580
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Patent number 446,580
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Issue date Feb 17, 1891
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F28 - HEAT EXCHANGE IN GENERAL
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325405
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Patent number 325,405
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Issue date Sep 1, 1885
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F28 - HEAT EXCHANGE IN GENERAL
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238609
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Patent number 238,609
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Issue date Mar 8, 1881
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F28 - HEAT EXCHANGE IN GENERAL
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200948
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Patent number 200,948
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Issue date Mar 5, 1878
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F28 - HEAT EXCHANGE IN GENERAL
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190205
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Patent number 190,205
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Issue date May 1, 1877
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F28 - HEAT EXCHANGE IN GENERAL
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72074
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Patent number 72,074
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Issue date Dec 10, 1867
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F28 - HEAT EXCHANGE IN GENERAL