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| 4 Minute Warning ： ウィキペディア英語版 |
Four-minute warning
The four-minute warning was a public alert system conceived by the British Government during the Cold War and operated between 1953 and 1992. The name derived from the approximate length of time from the point at which a Soviet nuclear missile attack against the United Kingdom could be confirmed and the impact of those missiles on their targets. The population was to be notified by means of air raid sirens, television and radio, and urged to seek cover immediately. In practice, the warning would have been more likely three minutes or less.
== The warning system ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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