Counties
2 Matching Results
Results open in a new window/tab.
Results:
1 - 2 of
2
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
System:
The Portal to Texas History
Vacuum-Operated Make-and-Break Spark-Plug.
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
System:
The Portal to Texas History