UNT Libraries Government Documents Department - 780 Matching Results

Search Results


Description: Patent for an improved type of cotton chopper that thins rows of plants on both flat and rough terrain. Includes illustrations and instructions.
Date: June 10, 1913
Creator: Hellums, Oscar S.


Description: Patent for a small animal trap which consists of a cage suspended in the air on a spring system which drops when an animal disturbs the bait.
Date: July 20, 1909
Creator: Franks, Marion M.


Description: Patent for a new Hoisting-Machine. The Hoisting Machine has improved arrangement of parts that control the device's braking drum. Improving the Hoisting Machine construction is useful for reducing wear on the machine.
Date: May 21, 1912
Creator: Johnston, Horace

Casing Spear

Description: Patent for casing spears. This invention is designed for pulling well tubes or casings that have broken off out of the well. Illustration included.
Date: August 25, 1908
Creator: Carroll, Monroe W. & Johnston, H. G.

Hydraulic Swivel

Description: Patent for a hydraulic swivel. This design produced a mechanism for supporting a supply hose in a given position.
Date: October 27, 1903
Creator: Johnston, Horace G.; Sturm, William P. & Sturm, Jacob W.