Which celebrated 1960s series was the number-one program in television from 1976 to 1977?

Happy Days aired first-run on ABC from January 15, 1974, to July 19, 1984, with a total of 255 episodes over 11 seasons. Regarded as one of the most successful sitcoms of the 70s, Happy Days starred Ron Howard, Henry Winkler, Tom Bosley, and Marion Ross.

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