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Well-Drill Wrench.

Description: Patent for a well drill wrench that is easily adjustable for different sized drill chucks. Its designs makes rotating the wrench smoother and less likely to slip off of drill chucks.
Date: November 8, 1921
Creator: Ellinger, William H.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Hydraulic Milk Cooler

Description: Patent for a hydraulic milk cooler. This invention is shrouded in coolant agent absorbing material that is hydraulically applied to keep dairy products cool. Illustrations included.
Date: December 8, 1903
Creator: Womble, Zachariah C.
Item Type: Refine your search to only Patent
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.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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