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3850148
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Patent number 3,850,148
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Issue date Nov 26, 1974
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F22 - STEAM GENERATION
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3828738
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Patent number 3,828,738
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Issue date Aug 13, 1974
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F22 - STEAM GENERATION
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3780705
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Patent number 3,780,705
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Issue date Dec 25, 1973
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F22 - STEAM GENERATION
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3550562
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Patent number 3,550,562
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Issue date Dec 29, 1970
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F22 - STEAM GENERATION
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3412714
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Patent number 3,412,714
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Issue date Nov 26, 1968
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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3127877
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Patent number 3,127,877
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Issue date Apr 7, 1964
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
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3120839
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Patent number 3,120,839
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Issue date Feb 11, 1964
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F22 - STEAM GENERATION