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3309872
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Patent number 3,309,872
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Issue date Mar 21, 1967
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F22 - STEAM GENERATION
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2162746
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Patent number 2,162,746
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Issue date Jun 20, 1939
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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2149438
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Patent number 2,149,438
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Issue date Mar 7, 1939
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F22 - STEAM GENERATION
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2059946
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Patent number 2,059,946
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Issue date Nov 3, 1936
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F22 - STEAM GENERATION
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1823800
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Patent number 1,823,800
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Issue date Sep 15, 1931
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F22 - STEAM GENERATION
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1809896
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Patent number 1,809,896
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Issue date Jun 16, 1931
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F28 - HEAT EXCHANGE IN GENERAL
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1806030
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Patent number 1,806,030
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Issue date May 19, 1931
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F22 - STEAM GENERATION
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1788520
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Patent number 1,788,520
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Issue date Jan 13, 1931
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F22 - STEAM GENERATION
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1768448
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Patent number 1,768,448
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Issue date Jun 24, 1930
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F22 - STEAM GENERATION
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1768057
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Patent number 1,768,057
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Issue date Jun 24, 1930
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F22 - STEAM GENERATION