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Valve for Engines.

Description: Patent for an improved and cheaper valve for steam engines.
Date: January 26, 1909
Creator: Hopper, James F.
Partner: UNT Libraries Government Documents Department

Cotton-Gin

Description: Patent for a cotton gin which removes lint with air pressure. Illustrations included.
Date: January 26, 1909
Creator: Epps, Clinton Calvin
Partner: UNT Libraries Government Documents Department
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