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3899023
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Patent number 3,899,023
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Issue date Aug 12, 1975
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F28 - HEAT EXCHANGE IN GENERAL
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3877516
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Patent number 3,877,516
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Issue date Apr 15, 1975
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D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...
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1621707
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Patent number 1,621,707
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Issue date Mar 22, 1927
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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1603817
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Patent number 1,603,817
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Issue date Oct 19, 1926
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F28 - HEAT EXCHANGE IN GENERAL
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1598649
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Patent number 1,598,649
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Issue date Sep 7, 1926
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F28 - HEAT EXCHANGE IN GENERAL
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1382676
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Patent number 1,382,676
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Issue date Jun 28, 1921
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F28 - HEAT EXCHANGE IN GENERAL
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1364921
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Patent number 1,364,921
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Issue date Jan 11, 1921
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F28 - HEAT EXCHANGE IN GENERAL
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989415
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Patent number 989,415
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Issue date Apr 11, 1911
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F28 - HEAT EXCHANGE IN GENERAL
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806797
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Patent number 806,797
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Issue date Dec 12, 1905
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F28 - HEAT EXCHANGE IN GENERAL
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731816
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Patent number 731,816
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Issue date Jun 23, 1903
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F28 - HEAT EXCHANGE IN GENERAL
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551299
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Patent number 551,299
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Issue date Dec 10, 1895
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F28 - HEAT EXCHANGE IN GENERAL
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545181
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Patent number 545,181
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Issue date Aug 27, 1895
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F28 - HEAT EXCHANGE IN GENERAL
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264448
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Patent number 264,448
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Issue date Sep 19, 1882
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F28 - HEAT EXCHANGE IN GENERAL
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102965
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Patent number 102,965
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Issue date May 10, 1870
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F28 - HEAT EXCHANGE IN GENERAL
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60975
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Patent number 60,975
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Issue date Jan 1, 1867
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F28 - HEAT EXCHANGE IN GENERAL
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26529
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Patent number 26,529
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Issue date Dec 20, 1859
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F28 - HEAT EXCHANGE IN GENERAL
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17586
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Patent number 17,586
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Issue date Jun 16, 1857
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F28 - HEAT EXCHANGE IN GENERAL