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3866668
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Patent number 3,866,668
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Issue date Feb 18, 1975
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F28 - HEAT EXCHANGE IN GENERAL
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3811495
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Patent number 3,811,495
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Issue date May 21, 1974
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F28 - HEAT EXCHANGE IN GENERAL
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3773106
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Patent number 3,773,106
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Issue date Nov 20, 1973
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F28 - HEAT EXCHANGE IN GENERAL
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3744938
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Patent number 3,744,938
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Issue date Jul 10, 1973
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F28 - HEAT EXCHANGE IN GENERAL
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3613368
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Patent number 3,613,368
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Issue date Oct 19, 1971
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F28 - HEAT EXCHANGE IN GENERAL
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3590786
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Patent number 3,590,786
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Issue date Jul 6, 1971
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F28 - HEAT EXCHANGE IN GENERAL
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3204401
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Patent number 3,204,401
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Issue date Sep 7, 1965
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F28 - HEAT EXCHANGE IN GENERAL