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3734172
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Patent number 3,734,172
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Issue date May 22, 1973
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F28 - HEAT EXCHANGE IN GENERAL
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3045980
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Patent number 3,045,980
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Issue date Jul 24, 1962
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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1062896
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Patent number 1,062,896
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Issue date May 27, 1913
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F28 - HEAT EXCHANGE IN GENERAL
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553946
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Patent number 553,946
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F28 - HEAT EXCHANGE IN GENERAL
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280540
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Patent number 280,540
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F28 - HEAT EXCHANGE IN GENERAL
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219388
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Patent number 219,388
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F28 - HEAT EXCHANGE IN GENERAL
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171922
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Patent number 171,922
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Issue date Jan 11, 1876
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F28 - HEAT EXCHANGE IN GENERAL