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3390721
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Patent number 3,390,721
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Issue date Jul 2, 1968
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F22 - STEAM GENERATION
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3381746
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Patent number 3,381,746
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Issue date May 7, 1968
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F26 - DRYING
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Patent number 1,623,617
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Issue date Apr 5, 1927
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F28 - HEAT EXCHANGE IN GENERAL
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1509782
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Patent number 1,509,782
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Issue date Sep 23, 1924
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F22 - STEAM GENERATION
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676380
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Issue date Jun 11, 1901
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F28 - HEAT EXCHANGE IN GENERAL