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3703161
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Patent number 3,703,161
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Issue date Nov 21, 1972
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F22 - STEAM GENERATION
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3543732
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Patent number 3,543,732
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Issue date Dec 1, 1970
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F22 - STEAM GENERATION
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3063430
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Patent number 3,063,430
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Issue date Nov 13, 1962
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F22 - STEAM GENERATION
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1851715
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Patent number 1,851,715
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Issue date Mar 29, 1932
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F22 - STEAM GENERATION
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1475411
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Patent number 1,475,411
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Issue date Nov 27, 1923
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F22 - STEAM GENERATION