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3192908
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Patent number 3,192,908
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Issue date Jul 6, 1965
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F22 - STEAM GENERATION
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2908255
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Patent number 2,908,255
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Issue date Oct 13, 1959
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F22 - STEAM GENERATION
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2881741
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Patent number 2,881,741
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Issue date Apr 14, 1959
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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2153001
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Patent number 2,153,001
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Issue date Apr 4, 1939
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F22 - STEAM GENERATION
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2113833
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Patent number 2,113,833
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Issue date Apr 12, 1938
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F22 - STEAM GENERATION