Technicians work on a new experimental German Mercedes-Benz at Le Mans, France, June 17, 1952 where it was shipped to take part in the 24-hour Le Mans Race. An aerodynamic air vent on top is used as a brake at speeds of more than 100 m.p.h. It operates without the wheel brake. The door extends up to the center of the car roof and opens upward. (Photo by AP Photo)
