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The cue tone used to trigger the local ID at each transmitter is DTMF C-1-1. (Determined by FFT.) 121a0012 ( talk) 03:03, 16 October 2009 (UTC) reply

The infobox says the "Launch date" was April, 1921. However, it says the "First air date" was April 1979.

Exactly what is the difference between the "Launch date" and the "First air date"? If they are essentially the same thing, then the infobox is contradicting itself. Can anyone clarify? Thanks. 174.124.40.157 ( talk) 06:58, 6 October 2011 (UTC) reply