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Well-Drill Wrench

Description: Patent for a wrench for drill pipes used in drilling wells. Illustrations included.
Date: February 18, 1913
Creator: Osborne, William Rush & Lebus, George Franklin
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Back-Pressure Valve

Description: Patent for a back pressure valve for well drilling which may be "removed from the well with facility and despatch" (lines 18-20).
Date: January 18, 1910
Creator: Neighbors, Charles C.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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