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3831667
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Patent number 3,831,667
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Issue date Aug 27, 1974
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F28 - HEAT EXCHANGE IN GENERAL
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3789919
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Patent number 3,789,919
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Issue date Feb 5, 1974
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F28 - HEAT EXCHANGE IN GENERAL
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2803117
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Patent number 2,803,117
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Issue date Aug 20, 1957
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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2069430
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Patent number 2,069,430
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Issue date Feb 2, 1937
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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1963857
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Patent number 1,963,857
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Issue date Jun 19, 1934
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F28 - HEAT EXCHANGE IN GENERAL
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1945973
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Patent number 1,945,973
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Issue date Feb 6, 1934
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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1919190
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Patent number 1,919,190
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Issue date Jul 25, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1918966
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Patent number 1,918,966
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Issue date Jul 18, 1933
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F22 - STEAM GENERATION
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1908733
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Patent number 1,908,733
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Issue date May 16, 1933
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F28 - HEAT EXCHANGE IN GENERAL
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1814840
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Patent number 1,814,840
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Issue date Jul 14, 1931
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F28 - HEAT EXCHANGE IN GENERAL
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1427611
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Patent number 1,427,611
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F28 - HEAT EXCHANGE IN GENERAL
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1406815
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Patent number 1,406,815
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Issue date Feb 14, 1922
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F28 - HEAT EXCHANGE IN GENERAL
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1394692
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Patent number 1,394,692
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Issue date Oct 25, 1921
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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1272925
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Patent number 1,272,925
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Issue date Jul 16, 1918
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F28 - HEAT EXCHANGE IN GENERAL
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997749
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Patent number 997,749
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F28 - HEAT EXCHANGE IN GENERAL
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895700
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Patent number 895,700
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F28 - HEAT EXCHANGE IN GENERAL
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875362
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Patent number 875,362
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F28 - HEAT EXCHANGE IN GENERAL
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686860
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F28 - HEAT EXCHANGE IN GENERAL
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386579
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F28 - HEAT EXCHANGE IN GENERAL
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256350
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F28 - HEAT EXCHANGE IN GENERAL
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218984
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F28 - HEAT EXCHANGE IN GENERAL
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12089
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Patent number 12,089
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...