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Gas fired humidifier
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Patent number 6,446,877
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Issue date Sep 10, 2002
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Armstrong International, Incorporated
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Michael H. Gaines
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F24 - HEATING RANGES VENTILATING
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1971068
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Patent number 1,971,068
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Issue date Aug 21, 1934
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F22 - STEAM GENERATION
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1327188
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Patent number 1,327,188
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Issue date Jan 6, 1920
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F22 - STEAM GENERATION