Improvement in Jack-Screws and Clamps Combined.
Description:
Patent for an invention "to combine a jack-screw or lifting-jack with a clamp, so that they may be interchangeably used." (Lines 19-21) Includes instructions and illustrations.
Date:
May 20, 1873
Creator:
Jackson, Thomas R.; Jackson, Asberry C. & Watson, Claudius S.
Item Type:
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Partner:
UNT Libraries Government Documents Department