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3799253
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Patent number 3,799,253
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Issue date Mar 26, 1974
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F28 - HEAT EXCHANGE IN GENERAL
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3797566
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Patent number 3,797,566
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Issue date Mar 19, 1974
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F28 - HEAT EXCHANGE IN GENERAL
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3232341
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Patent number 3,232,341
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Issue date Feb 1, 1966
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F28 - HEAT EXCHANGE IN GENERAL
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1719909
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Patent number 1,719,909
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Issue date Jul 9, 1929
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F28 - HEAT EXCHANGE IN GENERAL
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1594911
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Patent number 1,594,911
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Issue date Aug 3, 1926
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F28 - HEAT EXCHANGE IN GENERAL
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1353642
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Patent number 1,353,642
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Issue date Sep 21, 1920
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F28 - HEAT EXCHANGE IN GENERAL
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942423
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Patent number 942,423
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Issue date Dec 7, 1909
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F28 - HEAT EXCHANGE IN GENERAL
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440087
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Patent number 440,087
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Issue date Nov 4, 1890
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F28 - HEAT EXCHANGE IN GENERAL
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113668
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Patent number 113,668
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Issue date Apr 11, 1871
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F28 - HEAT EXCHANGE IN GENERAL