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Rotary Valve Mechanism.

Description: Patent for a rotary valve mechanism that regulates an internal combustion engine's intake of charge and release of exhaust.
Date: June 8, 1915
Creator: Harpst, Frederick E.
Partner: UNT Libraries Government Documents Department

Improved Anchor for Animals.

Description: Patent for improvement in animals’ anchor in which it allow the animals to graze without being twisted or wound up the rope by using the combination of a swiveled loop and a pivoted loop with each other, and a pin. “This pin is made with four wings, or radial longitudinal flanges, tapering to a point at its lower end and is readily forced into the ground, and easily drawn out, but will resist a very strong side-draught.” (Lines23-27) Illustration is included.
Date: June 8, 1869
Creator: Raiford, P. H.
Partner: UNT Libraries Government Documents Department

Sample-Taking Device.

Description: Patent for improvements in Sample-Taking Devices, specially for drilling oil wells with the purpose of taking samples, which can be easily removed from the well without with-drawing the bit or drill stem.
Date: June 8, 1920
Creator: Huston, Sidney H.
Partner: UNT Libraries Government Documents Department

Screening Device for Oil-Wells.

Description: Patent for improvements in a screening device for oil wells that is specially made for wells constructed in places of strong gas pressure.
Date: June 8, 1920
Creator: Houston, Sidney H.
Partner: UNT Libraries Government Documents Department
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