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The diminutive spark plug turns a big 100

A spark plug is a small thing, sizewise. It is huge, though, in terms of its influence on the world's automotive industries, and it is one of the most integral components of modern living - even if seldom in view.

The spark plug design that lives on today was patented by Robert Bosch in 1902 - 100 years ago. Now almost taken for granted, the spark plug played a crucial part in the development of the gasoline engine, which in turn has given the modern world a level of personal mobility unimaginable a century ago.

Although spark plugs in varying forms had been around since the mid1800s, Bosch's practical high-voltage plug has changed little since it was invented, according to Germany's ...

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