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3841275
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Patent number 3,841,275
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Issue date Oct 15, 1974
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F22 - STEAM GENERATION
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2636483
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Patent number 2,636,483
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Issue date Apr 28, 1953
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F22 - STEAM GENERATION
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2636484
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Patent number 2,636,484
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Issue date Apr 28, 1953
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F22 - STEAM GENERATION
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2608938
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Patent number 2,608,938
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Issue date Sep 2, 1952
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A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
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2551945
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Patent number 2,551,945
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Issue date May 8, 1951
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F22 - STEAM GENERATION
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2550066
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Patent number 2,550,066
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Issue date Apr 24, 1951
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F22 - STEAM GENERATION
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2537698
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Patent number 2,537,698
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Issue date Jan 9, 1951
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F22 - STEAM GENERATION
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2469487
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Patent number 2,469,487
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Issue date May 10, 1949
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F22 - STEAM GENERATION
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2386679
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Patent number 2,386,679
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Issue date Oct 9, 1945
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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2360260
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Patent number 2,360,260
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Issue date Oct 10, 1944
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F22 - STEAM GENERATION
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2346716
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Patent number 2,346,716
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Issue date Apr 18, 1944
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F22 - STEAM GENERATION
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2346715
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Patent number 2,346,715
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Issue date Apr 18, 1944
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F22 - STEAM GENERATION
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2318040
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Patent number 2,318,040
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Issue date May 4, 1943
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F22 - STEAM GENERATION
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2009727
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Patent number 2,009,727
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Issue date Jul 30, 1935
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F22 - STEAM GENERATION
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1997215
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Patent number 1,997,215
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Issue date Apr 9, 1935
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F22 - STEAM GENERATION
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1964133
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Patent number 1,964,133
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Issue date Jun 26, 1934
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F22 - STEAM GENERATION
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1952932
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Patent number 1,952,932
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Issue date Mar 27, 1934
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F22 - STEAM GENERATION
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1947225
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Patent number 1,947,225
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Issue date Feb 13, 1934
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F22 - STEAM GENERATION
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1941295
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Patent number 1,941,295
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Issue date Dec 26, 1933
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F22 - STEAM GENERATION
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1939787
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Patent number 1,939,787
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Issue date Dec 19, 1933
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F22 - STEAM GENERATION
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1938705
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Patent number 1,938,705
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Issue date Dec 12, 1933
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F22 - STEAM GENERATION
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1925026
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Patent number 1,925,026
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Issue date Aug 29, 1933
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F22 - STEAM GENERATION
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1882211
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Patent number 1,882,211
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Issue date Oct 11, 1932
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F22 - STEAM GENERATION
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1882210
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Patent number 1,882,210
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Issue date Oct 11, 1932
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F22 - STEAM GENERATION
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1874236
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Patent number 1,874,236
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Issue date Aug 30, 1932
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F22 - STEAM GENERATION
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1852284
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Patent number 1,852,284
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Issue date Apr 5, 1932
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F22 - STEAM GENERATION
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1795537
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Patent number 1,795,537
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Issue date Mar 10, 1931
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F28 - HEAT EXCHANGE IN GENERAL
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1795241
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Patent number 1,795,241
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Issue date Mar 3, 1931
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F22 - STEAM GENERATION
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1768321
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Patent number 1,768,321
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Issue date Jun 24, 1930
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F22 - STEAM GENERATION
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1768514
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Patent number 1,768,514
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Issue date Jun 24, 1930
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F22 - STEAM GENERATION