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3526275
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Patent number 3,526,275
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Issue date Sep 1, 1970
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F28 - HEAT EXCHANGE IN GENERAL
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3450199
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Patent number 3,450,199
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Issue date Jun 17, 1969
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F28 - HEAT EXCHANGE IN GENERAL
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1833871
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Patent number 1,833,871
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Issue date Nov 24, 1931
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F28 - HEAT EXCHANGE IN GENERAL
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1713456
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Patent number 1,713,456
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Issue date May 14, 1929
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F28 - HEAT EXCHANGE IN GENERAL
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1662143
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Patent number 1,662,143
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Issue date Mar 13, 1928
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F28 - HEAT EXCHANGE IN GENERAL
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1144235
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Patent number 1,144,235
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Issue date Jun 22, 1915
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F28 - HEAT EXCHANGE IN GENERAL
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708647
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Patent number 708,647
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Issue date Sep 9, 1902
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F28 - HEAT EXCHANGE IN GENERAL
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150952
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Patent number 150,952
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Issue date May 19, 1874
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F28 - HEAT EXCHANGE IN GENERAL