· bark overcomes Felix Er (Felix Wankel) the inventor that is rotor engine, 1902 be born in Germany. Be in early the Second World War erupts eve, bark gram Er begins to study have the aid of turns at coming back (is not move back and forth) the feasibility that move and obtains dynamical source.

To 50 time initial stage, bark the engineer that overcome Er finished many blueprint design and computation, begin to make " rotate piston engine " classic of this one project, NSU company of Germany produced great interest to this. Then, he has strenuous effort, was engaged in much research work, make a prototype in 50 time.

Because be the rotor engine that barks Kerr is invented (also say to rotate piston engine) , because this calls rotor engine again,bark overcomes Er engine.