Well-Boring Machine.
Description:
Patent for improved mechanism of well-boring machine in which it “composed of as few parts as possible, which will effectively grip and rotate a drill-rod or pipe containing coupling and reducing - nipples, or composed of length or sections of varying diameters without impeding the end movement or deranging the central position of said drill-rod or pipe, and without delaying the progress of the machine, to adjust or change any part or parts thereof, also to improve the means for gripping the dr…
more
Date:
June 17, 1902
Creator:
Woods, Frank J.
Partner:
UNT Libraries Government Documents Department