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1884929
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Patent number 1,884,929
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Issue date Oct 25, 1932
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F22 - STEAM GENERATION
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1592893
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Patent number 1,592,893
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Issue date Jul 20, 1926
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F22 - STEAM GENERATION
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1564686
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Patent number 1,564,686
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Issue date Dec 8, 1925
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F22 - STEAM GENERATION
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1400667
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Patent number 1,400,667
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Issue date Dec 20, 1921
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F22 - STEAM GENERATION