In which city is the headquarters of the manufacturer of the engine used in the 1997 Rinspeed Mono Ego?
Hyundai Hyundai Group (Hangul:  ; Hanja:  , ] ) is a multinational chaebol (conglomerate) headquartered in Seoul, South Korea. It was founded by Chung Ju-yung in 1947 as a construction firm and Chung was directly in control of the company until his death in 2001.
Horex Horex is a German motorcycle manufacturer. In 1920 Friedrich Kleemann (1868-1949), financial manager at the Rex Konservenglas Gesellschaft (preservative jar manufacturing company) in Bad Homburg (Germany) bought COLUMBUS MOTORENBAU AG, a small motor factory in Oberursel by Taunus, which was in the neighbourhood. The factory made the later Horex model and the name remained the same for almost 30 years. Fritz Kleemann, the son of Friedrich Kleemann, made the first cycles with a GNOM engine, delivered from the Columbus-Engine factory.