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  2. Time bomb - Wikipedia

    en.wikipedia.org/wiki/Time_bomb

    A time bomb's timing mechanism may be professionally manufactured either separately or as part of the device, or it may be improvised from an ordinary household timer such as a wind-up alarm clock, wrist watch, digital kitchen timer, or notebook computer. The timer can be programmed to count up or count down (usually the latter; as the bomb ...

  3. The Last Alarm (1940 film) - Wikipedia

    en.wikipedia.org/wiki/The_Last_Alarm_(1940_film)

    Jim and Frank go after the arsonist, who has lost his bureau tail. The arsonist goes to the basement of the Hadley house where he plants a time bomb. He goes upstairs and confronts Mrs. Hadley and Joan, and as Jim and Frank realize he may be back at their house—having been seen in the vicinity—the bomb goes off and the basement catches fire.

  4. Four-minute warning - Wikipedia

    en.wikipedia.org/wiki/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.

  5. Improvised explosive device - Wikipedia

    en.wikipedia.org/wiki/Improvised_explosive_device

    These devices would detonate the bomb if it was moved in any way. Typically, the safety-arming device used was a clockwork Memopark timer, which armed the bomb up to 60 minutes after it was placed [92] by completing an electrical circuit supplying power to the anti-handling

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    mail.aol.com

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  7. Ahmed Mohamed clock incident - Wikipedia

    en.wikipedia.org/wiki/Ahmed_Mohamed_clock_incident

    Bill Maher said on his HBO series Real Time with Bill Maher that Mohamed deserves an apology but that his clock "looks exactly like a fucking bomb". In the same "Real Time" interview, entrepreneur Mark Cuban, one of the panelists on the show, stated that he called Mohamed on the phone to discuss the event and Mohamed's interest in technology ...

  8. Timer - Wikipedia

    en.wikipedia.org/wiki/Timer

    A typical kitchen timer. A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. An example of a simple timer is an hourglass. Commonly, a timer triggers an alarm when it ends. A timer can be implemented through hardware or software.

  9. Civil defense siren - Wikipedia

    en.wikipedia.org/wiki/Civil_defense_siren

    The outdoor sirens are tested four times a year on the first non-holiday Monday of March, June, September, and December at 15:00 local time. The test consists of the general alarm for 2 minutes, followed by a 90-second gap before the "all clear" is sounded. There are usually around 15 to 20 general alarms, occurring locally, per year.