High Quality Content by WIKIPEDIA articles! Rennzweier (The Double Racer) is a veteran automobile manufactured by Nesselsdorfer Wagenbau-Fabriks-Gesellschaft A.G. (now known as Tatra) in 1900. It is sometimes called also as First racing, 12 HP or Rennwagen (The Race Car). It was manufactured on order by baron Theodor von Liebig. Also Hans Ledwinka, at the time only 20 years old, was taking part in construction of the car, later to become the most important Tatra designer. The car was manufactured on May 5, 1900, and the manufacture process took only 5 weeks.