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3318375
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Patent number 3,318,375
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Issue date May 9, 1967
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F28 - HEAT EXCHANGE IN GENERAL
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3315739
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Patent number 3,315,739
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Issue date Apr 25, 1967
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F28 - HEAT EXCHANGE IN GENERAL
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3272260
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Patent number 3,272,260
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Issue date Sep 13, 1966
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F28 - HEAT EXCHANGE IN GENERAL
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3106957
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Patent number 3,106,957
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Issue date Oct 15, 1963
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F28 - HEAT EXCHANGE IN GENERAL
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2887304
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Patent number 2,887,304
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Issue date May 19, 1959
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F28 - HEAT EXCHANGE IN GENERAL
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2821369
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Patent number 2,821,369
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Issue date Jan 28, 1958
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F28 - HEAT EXCHANGE IN GENERAL
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1657704
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Patent number 1,657,704
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Issue date Jan 31, 1928
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F28 - HEAT EXCHANGE IN GENERAL