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21-Jul-2017 03:38

C., in 1923, attempted to transmit audio between cities via low-quality telegraph lines.AT&T refused outside companies access to its high-quality phone lines.Various histories of NBC suggest the color designations for the two networks came from the color of the pushpins NBC engineers used to designate affiliate stations of WEAF (red) and WJZ (blue), or from the use of double-ended red and blue colored pencils.On April 5, 1927, NBC expanded to the West Coast with the launch of the NBC Orange Network, also known as the Pacific Coast Network.

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The network is headquartered at 30 Rockefeller Plaza in New York City, with additional major offices near Los Angeles (at 10 Universal City Plaza), and Chicago (at the NBC Tower).The early effort fared poorly, since the uninsulated telegraph lines were susceptible to atmospheric and other electrical interference.