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3015319
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Patent number 3,015,319
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Issue date Jan 2, 1962
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F22 - STEAM GENERATION
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2991621
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Patent number 2,991,621
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Issue date Jul 11, 1961
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F22 - STEAM GENERATION
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2983262
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Patent number 2,983,262
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Issue date May 9, 1961
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F22 - STEAM GENERATION
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2976856
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Patent number 2,976,856
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Issue date Mar 28, 1961
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F22 - STEAM GENERATION
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2949896
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Patent number 2,949,896
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Issue date Aug 23, 1960
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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2852005
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Patent number 2,852,005
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Issue date Sep 16, 1958
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F22 - STEAM GENERATION
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2848983
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Patent number 2,848,983
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Issue date Aug 26, 1958
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F22 - STEAM GENERATION
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1841869
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Patent number 1,841,869
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Issue date Jan 19, 1932
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F22 - STEAM GENERATION