에이티앤티(AT&T) - basketball

A national monopoly

AT&T, RCA, and their patent allies and partners finally settled their disputes in 1926 by compromise. AT&T decided to focus on the telephone business as a communications common carrier, and sold its broadcasting subsidiary Broadcasting Corporation of America to RCA. The assets included station WEAF, which for some time had broadcast from AT&T headquarters in New York City. In return, RCA signed a service agreement with AT&T, ensuring any radio network RCA started would have transmission connections provided by AT&T. Both companies agreed to cross-license patents, ending that aspect of the dispute. RCA, GE, and Westinghouse were now free to combine their assets to form the National Broadcasting Company, or NBC network.
From http://en.wikipedia.org/wiki/American_Telephone_and_Telegraph