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Automatic Trough-Valve.

Description: Patent for improvements in animal watering troughs that has an automatic float control valve in connection with the trough.
Date: July 20, 1920
Creator: Striegler, Fritz
Partner: UNT Libraries Government Documents Department

Windmill-Gearing

Description: Patent for improved windmill gearing, intended to reduce stain on the machinery
Date: April 13, 1920
Creator: Roberts, George W.
Partner: UNT Libraries Government Documents Department

Coupling.

Description: Patent for improvements to couplings for windmills specifically "for use in connecting the pump rod to the reciprocal rod of the windmill, so as to permit reciprocation of the wind mill rod independently of movement of the pump rod, and which also will permit the relatively quick and easy change from windmill power to engine power, such as gasolene engine or the like, for pumping water from wells" (lines 9-17) including instructions and illustrations.
Date: March 29, 1921
Creator: Regenier, John G.
Partner: UNT Libraries Government Documents Department
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