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3529663
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Patent number 3,529,663
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Issue date Sep 22, 1970
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F28 - HEAT EXCHANGE IN GENERAL
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2830798
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Patent number 2,830,798
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F28 - HEAT EXCHANGE IN GENERAL
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2498827
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Issue date Feb 28, 1950
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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1979751
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Patent number 1,979,751
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Issue date Nov 6, 1934
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F28 - HEAT EXCHANGE IN GENERAL
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1848741
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Patent number 1,848,741
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Issue date Mar 8, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1822698
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Patent number 1,822,698
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Issue date Sep 8, 1931
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F28 - HEAT EXCHANGE IN GENERAL
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1803035
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Patent number 1,803,035
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Issue date Apr 28, 1931
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F28 - HEAT EXCHANGE IN GENERAL
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1803034
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Patent number 1,803,034
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Issue date Apr 28, 1931
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F28 - HEAT EXCHANGE IN GENERAL
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1787086
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Patent number 1,787,086
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Issue date Dec 30, 1930
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F28 - HEAT EXCHANGE IN GENERAL
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1764200
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Patent number 1,764,200
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Issue date Jun 17, 1930
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F28 - HEAT EXCHANGE IN GENERAL
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1725549
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Patent number 1,725,549
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Issue date Aug 20, 1929
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F28 - HEAT EXCHANGE IN GENERAL
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1722109
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Patent number 1,722,109
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Issue date Jul 23, 1929
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F28 - HEAT EXCHANGE IN GENERAL
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1688183
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Patent number 1,688,183
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Issue date Oct 16, 1928
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F28 - HEAT EXCHANGE IN GENERAL
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1672650
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Patent number 1,672,650
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F28 - HEAT EXCHANGE IN GENERAL
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1489932
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F28 - HEAT EXCHANGE IN GENERAL
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1355980
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Patent number 1,355,980
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F28 - HEAT EXCHANGE IN GENERAL
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298202
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Patent number 298,202
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Issue date May 6, 1884
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F28 - HEAT EXCHANGE IN GENERAL