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Heat exchanger
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Patent number 4,281,710
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Issue date Aug 4, 1981
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FRAC, Inc.
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Fred Hadlock
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F28 - HEAT EXCHANGE IN GENERAL
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3895675
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Patent number 3,895,675
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Issue date Jul 22, 1975
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F28 - HEAT EXCHANGE IN GENERAL
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3662582
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Patent number 3,662,582
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Issue date May 16, 1972
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2286271
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Patent number 2,286,271
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Issue date Jun 16, 1942
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2244800
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Patent number 2,244,800
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Issue date Jun 10, 1941
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F28 - HEAT EXCHANGE IN GENERAL
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1881610
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Patent number 1,881,610
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Issue date Oct 11, 1932
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F28 - HEAT EXCHANGE IN GENERAL