Ernst Alexanderson continued alternator design research and developed more powerful transmitters that by 1919 were considered the best available option for long distance radiotelegraph communication. In 1919 GE's leadership in alternator manufacture led the U.S. government to promote the idea of the company taking over the assets of the Marconi Wireless Telegraph Company of America. This purchase was used to form a GE subsidiary, the Radio Corporation of America (RCA), which became the leading radio company in the United States. In 1921, GE signed a cross-licensing agreement with the Westinghouse Electric and Manufacturing Company that made RCA the sales agent for radio equipment produced by the two companies. (In 1932 RCA became an independent company as part of an antitrust settlement).