Question

Which is the worlds first 2 stroke engine

Answer 1

Sir Dugald Clerk (sometimes written as Dugald Clark) KBE, LLD FRS (1854, Glasgow – 1932, Ewhurst, Surrey) was a Scottish engineer who designed the world's first successful two-stroke engine in 1878 and patented it in England in 1881.
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Answer 2

https://en.m.wikipedia.org/wiki/Two-stroke_engine
Two-stroke engine - Wikipedia