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1675796
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Patent number 1,675,796
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Issue date Jul 3, 1928
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F28 - HEAT EXCHANGE IN GENERAL
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1618980
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Patent number 1,618,980
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Issue date Mar 1, 1927
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F28 - HEAT EXCHANGE IN GENERAL
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Patent number 1,618,279
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F28 - HEAT EXCHANGE IN GENERAL
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1522404
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F28 - HEAT EXCHANGE IN GENERAL
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1371996
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F28 - HEAT EXCHANGE IN GENERAL
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1103011
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Issue date Jul 7, 1914
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F28 - HEAT EXCHANGE IN GENERAL
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F28 - HEAT EXCHANGE IN GENERAL
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F28 - HEAT EXCHANGE IN GENERAL
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F28 - HEAT EXCHANGE IN GENERAL
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F28 - HEAT EXCHANGE IN GENERAL