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2677353
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Patent number 2,677,353
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Issue date May 4, 1954
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F22 - STEAM GENERATION
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1608446
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Patent number 1,608,446
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Issue date Nov 23, 1926
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F22 - STEAM GENERATION
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527052
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Patent number 527,052
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Issue date Oct 9, 1894
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F22 - STEAM GENERATION
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442608
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Patent number 442,608
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Issue date Dec 16, 1890
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F22 - STEAM GENERATION
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428609
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Patent number 428,609
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Issue date May 27, 1890
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F22 - STEAM GENERATION
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407726
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Patent number 407,726
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Issue date Jul 23, 1889
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F22 - STEAM GENERATION
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170032
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Patent number 170,032
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Issue date Nov 16, 1875
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F22 - STEAM GENERATION
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20546
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Patent number 20,546
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Issue date Jun 15, 1858
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F22 - STEAM GENERATION