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Valve Structure for Oil-Wells.

Description: Patent for Valve Oil-Wells. This improved Valve Oil Well will increase efficiency and durability of device.
Date: September 19, 1919
Creator: McEvoy, John Philip
Partner: UNT Libraries Government Documents Department

Machine for Cleaning Pipe-Lines

Description: Patent for a machine for cleaning pipe-lines. The machine uses the pipeline as a track, traveling along the track cleaning the pipeline.
Date: July 1, 1919
Creator: Kinzbach, Frank
Partner: UNT Libraries Government Documents Department

Combination Set-Collar for Well-Strainers.

Description: Patent for a combination set-collar for well-strainers that combines a back pressure valve and a washer pipe which allows for the cleaning of the strainer.
Date: November 25, 1919
Creator: Thompson, Alexander
Partner: UNT Libraries Government Documents Department
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