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Tread for Pneumatic Tires.

Description: Patent for an improvement in treads for pneumatic tires "to prevent excessive wear or puncture of the parts of the tire constituting the tread portion" (lines 12-14).
Date: September 30, 1919
Creator: Twombly, Royal W.
Partner: UNT Libraries Government Documents Department

Pump.

Description: Patent for an improved pump valve designed for a pump for pumping oil from oil wells "which will not be affected by the fluid or gas pressure in the bore" (lines 17-18).
Date: September 30, 1919
Creator: Graf, Sydney H.
Partner: UNT Libraries Government Documents Department

Pipe Puller

Description: Patent for a pipe puller design to be used in wells.
Date: September 30, 1919
Creator: Heckman, J.
Partner: UNT Libraries Government Documents Department

Self-Cleaning Pump-Valve

Description: Patent for a pump valve used in pumping oil wells which cleans itself with sand. The valve is simple and cheaply manufactured.
Date: September 30, 1919
Creator: Graf, Sydney H.
Partner: UNT Libraries Government Documents Department

Flexible Brace

Description: Patent for a brace that is placed between the body and axle of a vehicle apparatus. The purpose of the brace is to relieve the vehicle springs from strain.
Date: September 30, 1919
Creator: Smith, George W.
Partner: UNT Libraries Government Documents Department
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