 The Rotor is an amusement park ride first demonstrated in 1949 but has been surpassed by an amusement ride designed and manufactured by who?  
Rotor (ride): The Rotor is an amusement park ride, designed by German engineer Ernst Hoffmeister in the late 1940s. Rotor (ride):  The ride still appears in numerous amusement parks, although travelling variants have been surpassed by the Gravitron. Gravitron: The Gravitron (also known as the Starship, Starship 2000, Starship 3000, Starship 4000, Starship Area 51, Starship Gravitron, Starship Exodus, Alien Abduction, Alien Invasion, Twister, Devil's Hole, Area 51, and Enterprise) is an amusement ride, most commonly found as a portable ride at fairs and carnivals.
i don't know