 Complete the following phrase:  Oberhof had been the home of sledding activities since 1905, mostly bobsleigh. In 1931, the facility hosted the first ever FIBT World Championships in the two-man bobsleigh event won by the two-man German team of Hanns Killian and Sebastian Huber. After World War II, Oberhof was partitioned into East Germany. Following the successes of the East Germans at the FIL World Luge Championships during the 1960s with Thomas Köhler mens singles world champion in 1962 and 1967, mens doubles world champion in 1965 and 