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Automatic Trough-Valve.
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
System:
The Portal to Texas History
Windmill-Gearing
Patent for improved windmill gearing, intended to reduce stain on the machinery
Date:
April 13, 1920
Creator:
Roberts, George W.
System:
The Portal to Texas History