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3627039
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Patent number 3,627,039
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Issue date Dec 14, 1971
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F28 - HEAT EXCHANGE IN GENERAL
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3129756
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Patent number 3,129,756
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F22 - STEAM GENERATION
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Patent number 2,941,787
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Issue date Jun 21, 1960
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F28 - HEAT EXCHANGE IN GENERAL
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1884210
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Patent number 1,884,210
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Issue date Oct 25, 1932
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F28 - HEAT EXCHANGE IN GENERAL