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3880231
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Patent number 3,880,231
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Issue date Apr 29, 1975
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F28 - HEAT EXCHANGE IN GENERAL
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3797565
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Patent number 3,797,565
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Issue date Mar 19, 1974
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F28 - HEAT EXCHANGE IN GENERAL
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3259182
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Patent number 3,259,182
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Issue date Jul 5, 1966
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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3168137
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Patent number 3,168,137
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Issue date Feb 2, 1965
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F28 - HEAT EXCHANGE IN GENERAL
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791876
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Patent number 791,876
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Issue date Jun 6, 1905
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F28 - HEAT EXCHANGE IN GENERAL
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785580
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Patent number 785,580
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Issue date Mar 21, 1905
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F28 - HEAT EXCHANGE IN GENERAL
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563655
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Patent number 563,655
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Issue date Jul 7, 1896
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F28 - HEAT EXCHANGE IN GENERAL
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346348
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Patent number 346,348
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Issue date Jul 27, 1886
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F28 - HEAT EXCHANGE IN GENERAL
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119943
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Patent number 119,943
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Issue date Oct 17, 1871
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F28 - HEAT EXCHANGE IN GENERAL