Which achievement primarily distinguishes Jean Joseph Etienne Lenoir's engine work historically?

Answer

First engines sold commercially/serially

Lenoir produced a gas-fired, non-compression atmospheric engine, and several units were allegedly built and used commercially in Paris in 1860, making his the first commercially used engines.

Which achievement primarily distinguishes Jean Joseph Etienne Lenoir's engine work historically?

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Running Model of Very First Otto Langen. 1876 internal combustion ...

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