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1469407
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Patent number 1,469,407
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Issue date Oct 2, 1923
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F28 - HEAT EXCHANGE IN GENERAL
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1466530
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Patent number 1,466,530
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Issue date Aug 28, 1923
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F28 - HEAT EXCHANGE IN GENERAL
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1454483
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Patent number 1,454,483
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Issue date May 8, 1923
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F28 - HEAT EXCHANGE IN GENERAL
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1410356
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Patent number 1,410,356
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Issue date Mar 21, 1922
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F28 - HEAT EXCHANGE IN GENERAL
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1092242
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Patent number 1,092,242
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Issue date Apr 7, 1914
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F28 - HEAT EXCHANGE IN GENERAL