File:Richard William Pearse - The Handy Man's Spark Plug, Scientific American, 4 September 1909, page 164.jpg
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![File:Richard William Pearse - The Handy Man's Spark Plug, Scientific American, 4 September 1909, page 164.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Richard_William_Pearse_-_The_Handy_Man%27s_Spark_Plug%2C_Scientific_American%2C_4_September_1909%2C_page_164.jpg/300px-Richard_William_Pearse_-_The_Handy_Man%27s_Spark_Plug%2C_Scientific_American%2C_4_September_1909%2C_page_164.jpg?20231230221715)
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