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: Additional telephone circuits ( direct line to Toll Board ) will be required in certain cases, between " Basic Key Stations " and other stations to be known as " Relay Key Stations ".
Each " Basic Key Station " receiving an alert or warning signal from the A. D. C. C.
shall, if so directed, proceed to broadcast a predetermined message and also relay the message by telephone to all " Relay Key Stations " under his control as specified.
" CONELRAD was officially introduced on December 10, 1951.

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