 A year later he presented his first running prototype with such a body, the "Ley T6", and in 1923 Auto Union presented a streamliner concept car, designed by Jaray.Another of the first known cars with a ponton body is the Bugatti Type 32 "Tank" which participated in the 1923 French Grand Prix at Tours.In 1922 the Romanian engineer Aurel Persu filed a patent application for an “aerodynamically-shaped automobile with the wheels mounted inside the aerodynamic body” having a drag coefficient of only 0.22 and received it in Germany in 1924.