 Complete the following phrase:  The NHLs initial deal with Fox was significant, as a U.S. network television contract was long thought unattainable for the league during the presidency of John Ziegler. For 17 years after the 1975 Finals were broadcast on NBC, there would be no national over-the-air network coverage of the NHL in the United States except for the 1979 Challenge Cup and Game 6 of the 1980 Stanley Cup Finals on CBS, and NBCs coverage of the NHL All-Star Game from 