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3776304
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Patent number 3,776,304
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Issue date Dec 4, 1973
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F28 - HEAT EXCHANGE IN GENERAL
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3722581
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Patent number 3,722,581
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Issue date Mar 27, 1973
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F28 - HEAT EXCHANGE IN GENERAL
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3610326
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Patent number 3,610,326
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Issue date Oct 5, 1971
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F22 - STEAM GENERATION
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3374830
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Patent number 3,374,830
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Issue date Mar 26, 1968
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B64 - AIRCRAFT AVIATION COSMONAUTICS
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3205937
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Patent number 3,205,937
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Issue date Sep 14, 1965
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F28 - HEAT EXCHANGE IN GENERAL
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3163892
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Patent number 3,163,892
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Issue date Jan 5, 1965
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F24 - HEATING RANGES VENTILATING