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Tank-Bottom Holder.

Patent for a tank bottom holder that allows a tank bottom to be "securely and accurately maintained in proper cooperative relation to the edge turning tool and readily manipulated in the required manner" (lines 13-17). That tank bottom holder can be adjusted to fit a variety of tank bottom sizes, and the patent includes illustrations and instructions.

Date: August 11, 1914

Creator: Smith, Walter O.

Partner: UNT Libraries Government Documents Department

Vaporizing Attachment for Internal-Combustion Engines.

Patent for a vaporizing attachment for internal combustion engines which provides means for vaporizing and introducing liquid fuel into the cylinders while the motor is in motion.

Date: January 7, 1919

Creator: Irwin, Herbert G.

Partner: UNT Libraries Government Documents Department

Vacuum-Operated Make-And-Break Spark Plug

Patent for an improved "vacuum operated make and break spark plug" (lines 16-17) including illustrations.

Date: November 19, 1918

Creator: Irwin, Herbert G.

Partner: UNT Libraries Government Documents Department

Vacuum-Energized Make-and-Break Spark-Plug.

Patent for a vacuum-energized make-and-break spark plug that "relates to new and useful improvements in ignition apparatus for internal combustion engines" (lines 16-18) including instructions and illustrations.

Date: June 4, 1918

Creator: Irwin, Herbert Glen

Partner: UNT Libraries Government Documents Department