This year marks the 100th anniversary of the modern day spark plug patent, and after seven billion plugs later, the company that revolutionized spark plug design still is going strong. Robert Bosch Corp., a subsidiary of Robert Bosch GmbH, first patented its spark plug in 1902 to supplement a high-voltage magneto ignition system it invented. By then, spark plugs were hardly radical technology, but design was primitive and plugs would often foul and provide inferior detonation. Regular ...
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