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Air-Compressing Apparatus.

Description: Patent for a new air compressing apparatus which employs two kinds of tanks called high pressure containers and low pressure containers charged by means of an air compressing engine.
Date: March 16, 1915
Creator: Gebhardt, William Charles
Partner: UNT Libraries Government Documents Department

Internal Combustion Engine.

Description: Patent for improved internal combustion engine design that replaces puppet valves with slide valves to increase port area and speed, while reducing noise. Includes illustrations.
Date: July 9, 1912
Creator: Garfield, George M.
Partner: UNT Libraries Government Documents Department