-
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1813221
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Patent number 1,813,221
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Issue date Jul 7, 1931
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F28 - HEAT EXCHANGE IN GENERAL
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1707454
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Patent number 1,707,454
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Issue date Apr 2, 1929
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F28 - HEAT EXCHANGE IN GENERAL
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1695519
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Patent number 1,695,519
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Issue date Dec 18, 1928
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F28 - HEAT EXCHANGE IN GENERAL
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1694352
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Patent number 1,694,352
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Issue date Dec 4, 1928
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F28 - HEAT EXCHANGE IN GENERAL
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1606204
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Patent number 1,606,204
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Issue date Nov 9, 1926
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F28 - HEAT EXCHANGE IN GENERAL
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1575727
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Patent number 1,575,727
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Issue date Mar 9, 1926
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F28 - HEAT EXCHANGE IN GENERAL
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1572792
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Patent number 1,572,792
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Issue date Feb 9, 1926
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F28 - HEAT EXCHANGE IN GENERAL
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1520837
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Patent number 1,520,837
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Issue date Dec 30, 1924
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F28 - HEAT EXCHANGE IN GENERAL
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1516695
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Patent number 1,516,695
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Issue date Nov 25, 1924
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F28 - HEAT EXCHANGE IN GENERAL
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1434724
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Patent number 1,434,724
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Issue date Nov 7, 1922
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F28 - HEAT EXCHANGE IN GENERAL
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1412332
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Patent number 1,412,332
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Issue date Apr 11, 1922
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F28 - HEAT EXCHANGE IN GENERAL
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1404005
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Patent number 1,404,005
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Issue date Jan 17, 1922
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F28 - HEAT EXCHANGE IN GENERAL
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1400978
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Patent number 1,400,978
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Issue date Dec 20, 1921
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F28 - HEAT EXCHANGE IN GENERAL
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1351462
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Patent number 1,351,462
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Issue date Aug 31, 1920
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F28 - HEAT EXCHANGE IN GENERAL
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1347219
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Patent number 1,347,219
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Issue date Jul 20, 1920
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F28 - HEAT EXCHANGE IN GENERAL
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1344351
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Patent number 1,344,351
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Issue date Jun 22, 1920
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F28 - HEAT EXCHANGE IN GENERAL
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1337415
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Patent number 1,337,415
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Issue date Apr 20, 1920
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F28 - HEAT EXCHANGE IN GENERAL
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1282213
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Patent number 1,282,213
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Issue date Oct 22, 1918
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F28 - HEAT EXCHANGE IN GENERAL
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1228474
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Patent number 1,228,474
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Issue date Jun 5, 1917
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F28 - HEAT EXCHANGE IN GENERAL
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1145688
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Patent number 1,145,688
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Issue date Jul 6, 1915
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F28 - HEAT EXCHANGE IN GENERAL
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1101080
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Patent number 1,101,080
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Issue date Jun 23, 1914
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F28 - HEAT EXCHANGE IN GENERAL
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1026895
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Patent number 1,026,895
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Issue date May 21, 1912
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F28 - HEAT EXCHANGE IN GENERAL
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1026896
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Patent number 1,026,896
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Issue date May 21, 1912
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F28 - HEAT EXCHANGE IN GENERAL
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1019122
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Patent number 1,019,122
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Issue date Mar 5, 1912
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F28 - HEAT EXCHANGE IN GENERAL