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==M4+2 engine==
{{Advert section|date=October 2022}}
''' The M4+2 engine''', also known as the double-piston internal [[combustion]] engine, is a new type of [[internal combustion engine]] invented by a Polish patent holder Piotr Mężyk.<ref name="Piotr Mężyk">[http://izoling.beep.pl/www.izoling.pl/badania/czytaj/engine.html "Double pistons internal combustion engine"], Official site of the city of [[Myszków]], Poland ('''Polish'''). {{webarchive |url=https://web.archive.org/web/20170109041809/http://izoling.beep.pl/www.izoling.pl/badania/czytaj/engine.html |date=2017-01-09}}</ref>
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