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German bicycle designer Didi Senft, better known as 'El Diablo' or the Tour de France Devil, rides his 'Laufrad' (Running wheel) in Mannheim June 12, 2007. Senft presented his Laufrad, based upon
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Geschichte des Fahrrads: Zeitgenössischer Prospekt zur Laufmaschine - Verkehr - Technik - Planet Wissen
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