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Opposed-piston engine
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==Free-piston engine== {{Main|Free-piston engine}} A variation of the opposed-piston design is the free-piston engine, which was first patented in 1934. Free piston engines have no crankshaft, and the pistons are returned after each firing stroke by compression and expansion of air in a separate cylinder. Early applications were for use as an air compressor or as a gas generator for a [[gas turbine]].{{Citation needed|date=May 2024}}
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