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3907032
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Patent number 3,907,032
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Issue date Sep 23, 1975
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F28 - HEAT EXCHANGE IN GENERAL
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3702632
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Patent number 3,702,632
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Issue date Nov 14, 1972
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F28 - HEAT EXCHANGE IN GENERAL
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3262495
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Patent number 3,262,495
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F28 - HEAT EXCHANGE IN GENERAL
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3045979
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Patent number 3,045,979
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1906077
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Patent number 1,906,077
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F28 - HEAT EXCHANGE IN GENERAL
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1726360
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Patent number 1,726,360
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F28 - HEAT EXCHANGE IN GENERAL
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1548591
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F28 - HEAT EXCHANGE IN GENERAL
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1468686
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Patent number 1,468,686
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F28 - HEAT EXCHANGE IN GENERAL
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1458128
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Patent number 1,458,128
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F28 - HEAT EXCHANGE IN GENERAL
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1380132
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F28 - HEAT EXCHANGE IN GENERAL
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1313492
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Patent number 1,313,492
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F28 - HEAT EXCHANGE IN GENERAL
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1239491
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F28 - HEAT EXCHANGE IN GENERAL
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966721
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F28 - HEAT EXCHANGE IN GENERAL