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These aircraft conducted raids in bad weather with the mission of harassing the German air raid warning system.
During World War I, it was the Midland headquarters of the air raid warning system.
In the large underground nuclear bunker was the standby national control of the famous Four-minute warning air raid warning system for the UK.
The Air Raid Warning System, with the prominent letters YBRW indicating the threat/warning levels.
The council was involved in the development of AT&T's "Bell and Lights" Air Raid Warning System, which spanned Canada and the United States.
Beginning in 1952, the "Bell and Lights" Air Raid Warning System, developed by AT&T, was made available to provide automated transmission of an expanded set of alert signals:
Wörterbuch für Militärbegriffe