History of the National Football League on television
NBC was the first major television network to cover an NFL game, when on October 22, 1939, it broadcast a game between the Philadelphia Eagles and the Brooklyn Dodgers; the network was still only in its infancy, with only two affiliates, the modern day WRGB (now a CBS affiliate) in Schenectady and W2XBS in New York City. Portions of that game still survive via films, but the film is not footage from the telecast (recordings of television broadcasts did not begin until 1948). The use of a sideline camera, the sole camera used in the 1939 broadcast, would become the standard for all future NFL broadcasts until 2017; the angle is particularly suited for estimating yardage, compared to more mobile camera angles that began to appear in the 21st century.
NFL on CBS
CBS' 1976 telecast of Super Bowl X between the Pittsburgh Steelers and Dallas Cowboys was viewed by an estimated 80 million people, the largest television audience in history at the time. CBS' telecast featured play-by-play announcer Pat Summerall (calling his first Super Bowl in that role) and color commmentator Tom Brookshier. Towards the end of the game, Hank Stram took over for Brookshier, who had left the booth to head down to the locker room area to conduct the postgame interviews with the winning team.