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3521707
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Patent number 3,521,707
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Issue date Jul 28, 1970
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F28 - HEAT EXCHANGE IN GENERAL
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1969824
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Patent number 1,969,824
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Issue date Aug 14, 1934
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F28 - HEAT EXCHANGE IN GENERAL
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1969439
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Patent number 1,969,439
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F28 - HEAT EXCHANGE IN GENERAL
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Patent number 1,800,853
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Issue date Apr 14, 1931
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F28 - HEAT EXCHANGE IN GENERAL
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Patent number 1,717,348
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Issue date Jun 11, 1929
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F28 - HEAT EXCHANGE IN GENERAL
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Patent number 1,657,359
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F28 - HEAT EXCHANGE IN GENERAL
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Patent number 1,644,685
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Issue date Oct 11, 1927
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F28 - HEAT EXCHANGE IN GENERAL
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Patent number 1,567,845
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F28 - HEAT EXCHANGE IN GENERAL
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F28 - HEAT EXCHANGE IN GENERAL
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Issue date Oct 7, 1919
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F28 - HEAT EXCHANGE IN GENERAL