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3270807
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Patent number 3,270,807
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Issue date Sep 6, 1966
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F28 - HEAT EXCHANGE IN GENERAL
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3209820
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Patent number 3,209,820
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Issue date Oct 5, 1965
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F28 - HEAT EXCHANGE IN GENERAL
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3067818
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Patent number 3,067,818
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Issue date Dec 11, 1962
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F28 - HEAT EXCHANGE IN GENERAL
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1990356
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Patent number 1,990,356
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Issue date Feb 5, 1935
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G05 - CONTROLLING REGULATING
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1742348
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Patent number 1,742,348
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Issue date Jan 7, 1930
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F28 - HEAT EXCHANGE IN GENERAL