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Rudroff, riding a Honda bike, appeared in two Grand Prix in 1987, the West Germany Grand Prix and the Austrian Grand Prix where he qualified in positions 38 and 26 but did not compete in the final race.
At the 1952 German Grand Prix held at Solitude, Amm crashed and broke a leg, returning later in the 1952 Grand Prix motorcycle racing season to win the 350 cc class for the 1952 Nations Grand Prix held at Monza in Italy.