 Complete the following phrase:  His main event was the 400 metres hurdles. He became Norwegian champion in the event from 1957 through 1964, and won a silver medal in 1965. He held the Norwegian record between 1958 and 1960, with 51.5 as the best time, achieved in 1964. His best electronic time was 52.40 seconds. He competed in 400 metres hurdles at the 1960 Summer Olympics in Rome, but was knocked out in the semi-final. At both the 1958 and 