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3823693
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Patent number 3,823,693
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Issue date Jul 16, 1974
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F22 - STEAM GENERATION
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2200156
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Patent number 2,200,156
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Issue date May 7, 1940
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F28 - HEAT EXCHANGE IN GENERAL
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2121562
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Patent number 2,121,562
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Issue date Jun 21, 1938
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F22 - STEAM GENERATION
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2101892
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Patent number 2,101,892
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Issue date Dec 14, 1937
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F22 - STEAM GENERATION
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1866215
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Patent number 1,866,215
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Issue date Jul 5, 1932
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F22 - STEAM GENERATION
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1559763
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Patent number 1,559,763
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Issue date Nov 3, 1925
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F22 - STEAM GENERATION
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1413863
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Patent number 1,413,863
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Issue date Apr 25, 1922
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F22 - STEAM GENERATION
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1280318
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Patent number 1,280,318
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Issue date Oct 1, 1918
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F22 - STEAM GENERATION
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1167361
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Patent number 1,167,361
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Issue date Jan 4, 1916
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F22 - STEAM GENERATION
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994403
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Patent number 994,403
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Issue date Jun 6, 1911
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F22 - STEAM GENERATION
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970833
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Patent number 970,833
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F22 - STEAM GENERATION
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798327
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Patent number 798,327
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Issue date Aug 29, 1905
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F22 - STEAM GENERATION
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791561
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Patent number 791,561
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Issue date Jun 6, 1905
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F22 - STEAM GENERATION
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791314
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Patent number 791,314
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Issue date May 30, 1905
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F22 - STEAM GENERATION
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750721
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Patent number 750,721
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Issue date Jan 26, 1904
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F22 - STEAM GENERATION
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735282
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Patent number 735,282
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Issue date Aug 4, 1903
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F22 - STEAM GENERATION
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675658
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Patent number 675,658
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Issue date Jun 4, 1901
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F22 - STEAM GENERATION
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674939
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Patent number 674,939
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Issue date May 28, 1901
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F22 - STEAM GENERATION
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673494
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Patent number 673,494
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Issue date May 7, 1901
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F22 - STEAM GENERATION
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540128
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Patent number 540,128
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Issue date May 28, 1895
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F22 - STEAM GENERATION
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536197
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Patent number 536,197
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Issue date Mar 26, 1895
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F22 - STEAM GENERATION
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524391
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Patent number 524,391
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Issue date Aug 14, 1894
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F22 - STEAM GENERATION
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498239
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Patent number 498,239
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Issue date May 30, 1893
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F22 - STEAM GENERATION
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485556
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Patent number 485,556
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Issue date Nov 1, 1892
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F22 - STEAM GENERATION
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482459
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Patent number 482,459
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F22 - STEAM GENERATION
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413906
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Patent number 413,906
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Issue date Oct 29, 1889
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F22 - STEAM GENERATION
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362342
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Patent number 362,342
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F22 - STEAM GENERATION
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351859
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Patent number 351,859
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F22 - STEAM GENERATION
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325332
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Patent number 325,332
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F22 - STEAM GENERATION
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319120
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Patent number 319,120
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F22 - STEAM GENERATION