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3910236
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Patent number 3,910,236
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Issue date Oct 7, 1975
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F22 - STEAM GENERATION
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3267914
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Patent number 3,267,914
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F22 - STEAM GENERATION
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2650802
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Patent number 2,650,802
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F28 - HEAT EXCHANGE IN GENERAL
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2444908
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Patent number 2,444,908
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Issue date Jul 13, 1948
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F28 - HEAT EXCHANGE IN GENERAL
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2306183
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Patent number 2,306,183
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Issue date Dec 22, 1942
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F22 - STEAM GENERATION
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2069409
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Patent number 2,069,409
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Issue date Feb 2, 1937
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F22 - STEAM GENERATION
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2069515
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Patent number 2,069,515
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Issue date Feb 2, 1937
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F28 - HEAT EXCHANGE IN GENERAL
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2013309
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Patent number 2,013,309
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Issue date Sep 3, 1935
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F22 - STEAM GENERATION
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1825656
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Patent number 1,825,656
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Issue date Oct 6, 1931
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F22 - STEAM GENERATION
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1821702
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Patent number 1,821,702
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Issue date Sep 1, 1931
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F22 - STEAM GENERATION
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1786909
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Patent number 1,786,909
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Issue date Dec 30, 1930
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F22 - STEAM GENERATION
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1782205
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Patent number 1,782,205
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Issue date Nov 18, 1930
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F22 - STEAM GENERATION
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1765970
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Patent number 1,765,970
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Issue date Jun 24, 1930
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F28 - HEAT EXCHANGE IN GENERAL
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1757621
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Patent number 1,757,621
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Issue date May 6, 1930
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F22 - STEAM GENERATION
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1710530
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Patent number 1,710,530
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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1632291
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Patent number 1,632,291
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Issue date Jun 14, 1927
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F22 - STEAM GENERATION
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1565304
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Patent number 1,565,304
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F22 - STEAM GENERATION
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1565305
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Patent number 1,565,305
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Issue date Dec 15, 1925
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F22 - STEAM GENERATION
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1500895
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Patent number 1,500,895
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Issue date Jul 8, 1924
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F22 - STEAM GENERATION
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1495065
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Patent number 1,495,065
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F22 - STEAM GENERATION
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1392675
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Patent number 1,392,675
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F22 - STEAM GENERATION