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3670812
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Patent number 3,670,812
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Issue date Jun 20, 1972
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F28 - HEAT EXCHANGE IN GENERAL
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3180406
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Patent number 3,180,406
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Issue date Apr 27, 1965
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F28 - HEAT EXCHANGE IN GENERAL
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2965360
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Patent number 2,965,360
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Issue date Dec 20, 1960
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F28 - HEAT EXCHANGE IN GENERAL
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177384
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Patent number 177,384
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Issue date May 16, 1876
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F28 - HEAT EXCHANGE IN GENERAL
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161656
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Patent number 161,656
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Issue date Apr 6, 1875
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F28 - HEAT EXCHANGE IN GENERAL