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2034547
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Patent number 2,034,547
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Issue date Mar 17, 1936
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F22 - STEAM GENERATION
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1971851
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Patent number 1,971,851
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Issue date Aug 28, 1934
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F22 - STEAM GENERATION
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1950043
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Patent number 1,950,043
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Issue date Mar 6, 1934
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F22 - STEAM GENERATION
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1934965
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Patent number 1,934,965
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Issue date Nov 14, 1933
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F22 - STEAM GENERATION
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1880350
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Patent number 1,880,350
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Issue date Oct 4, 1932
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F22 - STEAM GENERATION
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1813058
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Patent number 1,813,058
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Issue date Jul 7, 1931
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F22 - STEAM GENERATION
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1657951
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Patent number 1,657,951
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Issue date Jan 31, 1928
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F22 - STEAM GENERATION
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1552296
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Patent number 1,552,296
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Issue date Sep 1, 1925
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F22 - STEAM GENERATION
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1437790
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Patent number 1,437,790
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Issue date Dec 5, 1922
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F22 - STEAM GENERATION
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981722
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Patent number 981,722
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Issue date Jan 17, 1911
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F22 - STEAM GENERATION
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872378
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Patent number 872,378
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Issue date Dec 3, 1907
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F22 - STEAM GENERATION
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853182
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Patent number 853,182
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Issue date May 7, 1907
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F22 - STEAM GENERATION
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843613
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Patent number 843,613
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Issue date Feb 12, 1907
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F22 - STEAM GENERATION
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806524
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Patent number 806,524
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Issue date Dec 5, 1905
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F22 - STEAM GENERATION
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776701
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Patent number 776,701
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Issue date Dec 6, 1904
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F22 - STEAM GENERATION
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776923
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Patent number 776,923
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Issue date Dec 6, 1904
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F22 - STEAM GENERATION
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774564
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Patent number 774,564
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Issue date Nov 8, 1904
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F22 - STEAM GENERATION
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616088
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Patent number 616,088
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Issue date Dec 20, 1898
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F22 - STEAM GENERATION
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340183
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Patent number 340,183
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Issue date Apr 20, 1886
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F22 - STEAM GENERATION
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234123
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Patent number 234,123
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Issue date Nov 9, 1880
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F22 - STEAM GENERATION
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197894
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Patent number 197,894
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Issue date Dec 4, 1877
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F22 - STEAM GENERATION
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193848
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Patent number 193,848
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Issue date Aug 7, 1877
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F22 - STEAM GENERATION
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135219
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Patent number 135,219
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Issue date Jan 28, 1873
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F22 - STEAM GENERATION
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109807
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Patent number 109,807
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Issue date Dec 6, 1870
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F22 - STEAM GENERATION
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105243
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Patent number 105,243
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Issue date Jul 12, 1870
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F22 - STEAM GENERATION
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77670
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Patent number 77,670
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Issue date May 5, 1868
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F22 - STEAM GENERATION
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71903
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Patent number 71,903
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Issue date Dec 10, 1867
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F22 - STEAM GENERATION
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40391
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Patent number 40,391
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Issue date Oct 27, 1863
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F22 - STEAM GENERATION
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11110
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Patent number 11,110
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Issue date Jun 20, 1854
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F22 - STEAM GENERATION