3 Matching Results

Search Results

Results: 1 - 3

Device for Unscrewing and Withdrawing Pipe.

Description: Patent for a device for unscrewing and withdrawing pipe from wells, mines, or other similar uses. This tool is attached at the end of a drill stem and threaded in the ordinary right hand direction to unscrew and withdraw.
Date: July 29, 1919
Creator: Fletcher, Harold W.
Partner: UNT Libraries Government Documents Department

Drilling Apparatus

Description: Patent for a drilling apparatus able to simultaneously bore into objects and rearm itself.
Date: April 29, 1919
Creator: Layne, Mahlon E.
Partner: UNT Libraries Government Documents Department

Power-Transmitting Mechanism

Description: Patent for improvements in a power transmitting mechanism.
Date: April 29, 1919
Creator: Smith, Robert W. J.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen