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AT&T refused outside companies access to its high-quality phone lines.

The early effort fared poorly, since the uninsulated telegraph lines were susceptible to atmospheric and other electrical interference.

The 1922 creation of WEAF offered a research-and-development center for those activities.

WEAF maintained a regular schedule of radio programs, including some of the first commercially sponsored programs, and was an immediate success.

Following the Comcast merger, Zucker left NBCUniversal and was replaced as CEO by Comcast executive Steve Burke.

In 1936, the Orange Network affiliate stations became part of the Red Network, and at the same time the Gold Network became part of the Blue Network.

In the 1930s, NBC also developed a network for shortwave radio stations, called the NBC White Network.

Westinghouse, a shareholder in RCA, had a competing outlet in Newark, New Jersey pioneer station WJZ (no relation to the radio and television station in Baltimore currently using those call letters), which also served as the flagship for a loosely structured network.

This station was transferred from Westinghouse to RCA in 1923, and moved to New York City.

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