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2804285
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Patent number 2,804,285
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Issue date Aug 27, 1957
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F28 - HEAT EXCHANGE IN GENERAL
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2650076
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Patent number 2,650,076
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Issue date Aug 25, 1953
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F28 - HEAT EXCHANGE IN GENERAL
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2645462
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Patent number 2,645,462
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Issue date Jul 14, 1953
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F28 - HEAT EXCHANGE IN GENERAL
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2595440
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Patent number 2,595,440
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Issue date May 6, 1952
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F28 - HEAT EXCHANGE IN GENERAL
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2547668
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Patent number 2,547,668
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Issue date Apr 3, 1951
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F28 - HEAT EXCHANGE IN GENERAL
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2539870
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Patent number 2,539,870
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Issue date Jan 30, 1951
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F28 - HEAT EXCHANGE IN GENERAL
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1121314
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Patent number 1,121,314
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Issue date Dec 15, 1914
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F28 - HEAT EXCHANGE IN GENERAL
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952723
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Patent number 952,723
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Issue date Mar 22, 1910
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F28 - HEAT EXCHANGE IN GENERAL
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723668
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Patent number 723,668
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Issue date Mar 24, 1903
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F28 - HEAT EXCHANGE IN GENERAL