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2126862
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F22 - STEAM GENERATION
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Patent number 2,015,338
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F22 - STEAM GENERATION
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Patent number 1,964,412
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F22 - STEAM GENERATION
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Patent number 1,929,891
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F22 - STEAM GENERATION
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1887141
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Patent number 1,887,141
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F22 - STEAM GENERATION
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1882422
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Patent number 1,882,422
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F22 - STEAM GENERATION
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F22 - STEAM GENERATION
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1753267
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F22 - STEAM GENERATION
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1437495
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F22 - STEAM GENERATION