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Roller-Bearing Swivel Wrench Plate.
Patent for improvements on Roller-Bearing Swivel Wrench Plates, including illustrations. The goal of this invention is to make the plates more efficient "for use with any suitable fishing tool, or bit for use in oil fields or water well drilling" (lines 12-14).
Date:
January 10, 1922
Creator:
Harralson, Charles L.
System:
The Portal to Texas History