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Car-Coupling.

Description: Patent for "construction and arrangement of arrow-shaped draw-heads and lever-bars adjustable upon rack-bars for the purpose of raising and lowering the draw-heads" (lines 16-20)including instructions and illustrations.
Date: April 20, 1880
Creator: Gray, John D.
Partner: UNT Libraries Government Documents Department

Lubricating Device for Rotary Drills

Description: Patent for improving the lubricating devices for rotary drills, especially the rotatble cutting devices attached to the head of the drill.
Date: April 20, 1915
Creator: Hughes, Howard Robard
Partner: UNT Libraries Government Documents Department

Spear

Description: Patent for a spear that is used to help withdraw or remove pipes that may get stuck in wellbores.
Date: April 20, 1920
Creator: Gray, Ellsworth
Partner: UNT Libraries Government Documents Department

Plunger For Deep-Well Pumps

Description: Patent for improved deep well pumps with plungers used to reduce wear and lower the amount of repairs needed
Date: April 20, 1920
Creator: Coulson, William J.
Partner: UNT Libraries Government Documents Department

Reamer

Description: Patent for the improvement of vertical reamers used in the drilling of wells. Intended to provide a multi-bladed reamer that expands holes more evenly with less parts than previous models.
Date: April 20, 1915
Creator: Hughes, Howard R.
Partner: UNT Libraries Government Documents Department

Inner Tube for Pneumatic Tires

Description: Patent for an inner tube for pneumatic tires that has been layered with vulcanized fabric so as to protect from damage. Illustrations included.
Date: April 20, 1909
Creator: Culmore, March
Partner: UNT Libraries Government Documents Department

Driving Gearing for Motor Vehicles

Description: Patent for a driving mechanism that allows all four wheels of a motor vehicle to be used for traction purposes.
Date: April 20, 1915
Creator: Twyford, Robert E.
Partner: UNT Libraries Government Documents Department

Hose-Coupling.

Description: Patent for a coupling device for train pipes used on railroad trains to connect fluid conduits and similar pipes.
Date: April 20, 1915
Creator: Hume, John
Partner: UNT Libraries Government Documents Department
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