/spark-plugs-123523251-f45c4c5ba5ad49e2b350c3cffc16c3c2.jpg "Inventors of the Spark Plug")
Inventors of the Spark Plug
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1950 U.S. advertisement for Champion spark plugs Stock Photo - Alamy
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File:Champion spark plug ad 1922.png - Wikimedia Commons
Champion Spark Plug Company | MyCompanies Wiki | Fandom
Champion® Small Engine Spark Plug at Menards®
12mm Long Reach Champion® Spark Plug for Twin Cam 88®, 96™, 103™, Sportster®, X-Wedge and S&S 4 1/8" Bore Engines | S&S Cycle
Champion (spark plug) - Wikipedia
The Lost History Of Champion Spark Plugs | SciWorx History - YouTube
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File:Champion Spark Plug 4.jpg - Wikimedia Commons
