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
Item Type:
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Partner:
UNT Libraries Government Documents Department