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BiographyThe Mutual Broadcasting System was an American commercial radio network in operation from 1934 to 1999. In the golden age of U.S. radio drama, Mutual was best known as the original network home of The Lone Ranger and The Adventures of Superman and as the long-time radio residence of The Shadow. For many years, it was a national broadcaster for Major League Baseball (including the All-Star Game and World Series), the National Football League, and Notre Dame football. During the late 1970s, Mutual pioneered the nationwide late night call-in radio show and introduced the country to Larry King.--Wikipedia.