According to recent historical studies, the Italian inventors Eugenio Barsanti and Felice Matteucci patented a first working efficient version of an internal combustion engine in 1854 in London (pt. Num. 1072).
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The principle of operation was described by the Italian inventors Eugenio Barsanti and Felice Matteucci in their British Patent no 1625 of 1857, though they never produced a marketable example.
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