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3769941
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Patent number 3,769,941
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Issue date Nov 6, 1973
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F22 - STEAM GENERATION
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3613643
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Patent number 3,613,643
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Issue date Oct 19, 1971
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F22 - STEAM GENERATION
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3213835
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Patent number 3,213,835
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Issue date Oct 26, 1965
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F22 - STEAM GENERATION
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2257358
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Patent number 2,257,358
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Issue date Sep 30, 1941
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F22 - STEAM GENERATION
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1883298
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Patent number 1,883,298
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Issue date Oct 18, 1932
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F22 - STEAM GENERATION
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1859857
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Patent number 1,859,857
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Issue date May 24, 1932
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F22 - STEAM GENERATION