There was no Super Bowl in 1952. It was first played in 1966.
The Detroit Lions did win the NFL Championship in 1952. That was the second of the four League Championships the Lions have won.
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There was no Super Bowl in 1950. The NFL champion for the 1950 season was the Cleveland Browns who defeated the Los Angeles Rams, 30-28, in the NFL championship game.
The Kansas City Chiefs won the 1970 Super Bowl. They defeated the Minnesota Vikings with a score of 23-7.
There was no Super Bowl in 1955. The NFL Championship Game in 1955 was won by the Cleveland Browns.
Nobody won the Super Bowl in 1930. The first Super Bowl wasn't played until the 1966 season.