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In its early years NBC (the National Broadcasting Company) operated five different broadcast networks all labeled by color: Red, Blue, Orange, Gold, and White. OTR hobbyists are probably aware of the Red and Blue Networks but may not be familiar with the other colors. On Jan. 4, 1923, the American Telephone and Telegraph Company (AT&T) started "chain" (or network) broadcasting which was then defined as "simultaneous broadcasting of an identical program by two or more connected stations." ... (read more