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in subjects: "oil wells"  
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Pipe-Wrench.

Description: Patent for the improvement of pipe wrenches necessary for use in well drilling or other circumstances where a wrench of strong construction is needed. This patent provides for a pipe wrench that can be easily adjusted to fit pipes of differing sizes and is easily manipulated for use regardless of direction.
Date: December 9, 1919
Creator: Carmichael, Robert E.
Item Type: Refine your search to only Patent
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.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Wire-Line Spooler

Description: Patent for a machine designed to spool wire. It is meant for assisting in oil well drilling operations
Date: March 28, 1919
Creator: Robinson, Robert B.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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