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The March 731 was a 
Formula One
Formula One (also known as Formula 1 or F1) is the highest class of international racing for open-wheel single-seater formula racing cars sanctioned by the Fédération Internationale de l'Automobile (FIA). The World Drivers' Championship, ...
racing car designed by Robin Herd of March Engineering for the season which saw continued use through .
References
{{F1 cars 1974 March Formula One cars Open wheel racing cars