an old airplane is on display in a museum with other antique cars and motorcycles behind it

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Four Stroke Engine

French engineer Marcel Leyat made plenty of "Helica" propeller-powered cars between 1913 and 1926 (30 were built, two still exist today). Some models had an open, unprotected propeller, good for shredding everything that might stand in their way. Other models gained a wooden protective shroud, which made them sort-of road-worthy (at least in France)

Four Stroke Engine

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Air Car