Improvement to Lifting-Jacks
Description:
Patent for the improvement of the lifting jack which allows the user to "lower the lifting bar by a step-by-step movement as well as to elevate the lifting bar by such a movement (lines 12-14). Includes instructions and illustration."
Date:
January 12, 1915
Creator:
Parker, Charles W. & Wittliff, Theodore H.
Item Type:
Refine your search to only
Patent
Partner:
UNT Libraries Government Documents Department