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Heat exchanger
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Patent number 4,962,296
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Issue date Oct 9, 1990
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Karl Ostbo
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F28 - HEAT EXCHANGE IN GENERAL
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Heat exchanger
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Patent number 4,782,892
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Issue date Nov 8, 1988
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Karl Ostbo
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F28 - HEAT EXCHANGE IN GENERAL
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3693711
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Patent number 3,693,711
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Issue date Sep 26, 1972
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3498371
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Patent number 3,498,371
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Issue date Mar 3, 1970
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F28 - HEAT EXCHANGE IN GENERAL
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2707096
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Patent number 2,707,096
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Issue date Apr 26, 1955
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F28 - HEAT EXCHANGE IN GENERAL
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1955261
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Patent number 1,955,261
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Issue date Apr 17, 1934
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F28 - HEAT EXCHANGE IN GENERAL
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1571068
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Patent number 1,571,068
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Issue date Jan 26, 1926
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F28 - HEAT EXCHANGE IN GENERAL
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940244
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Patent number 940,244
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Issue date Nov 16, 1909
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F28 - HEAT EXCHANGE IN GENERAL