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Vacuum-Operated Make-And-Break Spark Plug

Description: 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.

Description: 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

Cotton-Bur Separator.

Description: Patent for improvements in apparatus for separating burs from cotton lint despite severe weather conditions, illustrations included.
Date: August 20, 1918
Creator: Irwin, Samuel D.
Partner: UNT Libraries Government Documents Department
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