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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

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

Description: Patent for simple and efficient improvements to vacuum-operated make-and-break spark plugs, including illustrations and instructions.
Date: June 10, 1919
Creator: Irwin, Herbert Glen
Partner: UNT Libraries Government Documents Department
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