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3105469
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Patent number 3,105,469
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Issue date Oct 1, 1963
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F22 - STEAM GENERATION
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2762201
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Patent number 2,762,201
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Issue date Sep 11, 1956
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F22 - STEAM GENERATION
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2743583
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Patent number 2,743,583
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Issue date May 1, 1956
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F22 - STEAM GENERATION
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2635587
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Patent number 2,635,587
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Issue date Apr 21, 1953
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F22 - STEAM GENERATION
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2594471
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Patent number 2,594,471
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Issue date Apr 29, 1952
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F22 - STEAM GENERATION
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1795317
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Patent number 1,795,317
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Issue date Mar 10, 1931
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F22 - STEAM GENERATION
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1744452
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Patent number 1,744,452
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Issue date Jan 21, 1930
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F22 - STEAM GENERATION
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1341213
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Patent number 1,341,213
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Issue date May 25, 1920
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F22 - STEAM GENERATION