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  2. Civil defense siren - Wikipedia

    en.wikipedia.org/wiki/Civil_defense_siren

    A civil defense siren is a siren used to provide an emergency population warning ... Air-Raid alert signal on the civil defense alarm system: a siren sound of ...

  3. Siren (alarm) - Wikipedia

    en.wikipedia.org/wiki/Siren_(alarm)

    There are 8,200 alarm sirens for civil protection throughout Switzerland. They are tested once a year, on the first Wednesday in February. [1] Sound sample ⓘ An 1860s-era siren. [2] A siren is a loud noise-making device. Civil defense sirens are mounted in fixed locations and

  4. List of civil defense sirens - Wikipedia

    en.wikipedia.org/wiki/List_of_civil_defense_sirens

    This is a list of civil defense sirens. Alerting Communicators of America (ACA) sirens ... Thunderbolt (siren) Federal Signal 3T22 / 2T22; Federal Signal Model 2;

  5. Early warning system - Wikipedia

    en.wikipedia.org/wiki/Early_warning_system

    A HSS Engineering TWS 295 electronic sirens warning Civil Defense siren. An early warning system is a warning system that can be implemented as a chain of information communication systems and comprises sensors, event detection and decision subsystems for early identification of hazards. They work together to forecast and signal disturbances ...

  6. Warning system - Wikipedia

    en.wikipedia.org/wiki/Warning_system

    A HSS Engineering TWS 295 electronic sirens warning Civil Defense siren. There are 8,200 alarm sirens for civil protection throughout Switzerland. They are tested once a year, on the first Wednesday in February. [1] Sound sample ⓘ Warning light indicating danger of laser exposure

  7. List of sirens built by Alerting Communicators of America

    en.wikipedia.org/wiki/List_of_sirens_built_by...

    This siren is similar to Federal Signal's Thunderbolt series. Only a single unit remains in service in Milwaukee, WI. Screamers Electro-Mechanical 2, 5, 7.5, 10 8, 9, 9/12, 10/12 1968–1994 Omni Directional 102–115 dB at 100 ft. Series of small vertical sirens, comparable to Federal Signal Corporation's vertical sirens. Sentry 95

  8. Category:Sirens - Wikipedia

    en.wikipedia.org/wiki/Category:Sirens

    Pages in category "Sirens" ... reflect recent changes. Siren (alarm) * Directional siren ... Line Materials; Chrysler Air-Raid Siren; Civil defense siren; F. Federal ...

  9. CONELRAD - Wikipedia

    en.wikipedia.org/wiki/CONELRAD

    CONELRAD (Control of Electromagnetic Radiation) was a method of emergency broadcasting to the public of the United States in the event of enemy attack during the Cold War.It was intended to allow continuous broadcast of civil defense information to the public using radio stations, while rapidly switching the transmitter stations to make the broadcasts unsuitable for Soviet bombers that might ...

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