Derrick.
Description:
Patent for improvements in derricks or machines for hoisting heavy objects, which can be easily erected and operated; this device “can be manipulated with ease and by which the article being elevated or lowered may be changed in position without moving the support.” (Lines 20-23) Illustration is included.
Date:
April 21, 1891
Creator:
Lindsey, William E.
Item Type:
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Patent
Partner:
UNT Libraries Government Documents Department