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Door-Securer

Description: Patent for a portable device that can produce a secure room by securing the door.
Date: February 8, 1916
Creator: Simmons, Jesse W.
Partner: UNT Libraries Government Documents Department

Rotary Engine.

Description: Patent for a simplified rotary engine which uses steam, compressed air and other elastic fluids which act as motive fluid. This patent is special in that it is light and compact. This patent helps the engine start easily, reverse, and stop, as well as other types of motion.
Date: January 8, 1919
Creator: Campbell, William L.
Partner: UNT Libraries Government Documents Department

Churn.

Description: Patent for a churn, which can be cooled or warmed and which has an improved dasher.
Date: November 8, 1910
Creator: Jarnagin, Thomas Jefferson
Partner: UNT Libraries Government Documents Department
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