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3102395
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Patent number 3,102,395
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Issue date Sep 3, 1963
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F28 - HEAT EXCHANGE IN GENERAL
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2577254
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Patent number 2,577,254
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Issue date Dec 4, 1951
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F28 - HEAT EXCHANGE IN GENERAL
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1663299
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Patent number 1,663,299
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Issue date Mar 20, 1928
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F28 - HEAT EXCHANGE IN GENERAL
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1660406
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Patent number 1,660,406
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Issue date Feb 28, 1928
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F28 - HEAT EXCHANGE IN GENERAL