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2344077
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Patent number 2,344,077
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Issue date Mar 14, 1944
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F22 - STEAM GENERATION
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Patent number 1,736,411
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Issue date Nov 19, 1929
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F22 - STEAM GENERATION
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Patent number 1,732,439
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Issue date Oct 22, 1929
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F22 - STEAM GENERATION
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Patent number 1,711,659
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F22 - STEAM GENERATION
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Patent number 1,678,235
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Issue date Jul 24, 1928
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F22 - STEAM GENERATION