Apart from Carl Benz, in the 19th century a number of other inventors also worked on developing a vehicle powered by a combustion engine. These pioneers included the likes of Swiss inventor Isaac de Rivaz (1807), Belgian Jean-Joseph-Etienne Lenoir (1863) and Siegfried Marcus in Austria (1870). In some cases these vehicles only existed on paper, while in others they were small, self-propelled carriages which were not capable of transporting people.