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A Federal Signal Thunderbolt 1003 siren. The Thunderbolt is a mechanical outdoor warning siren that was manufactured by Federal Signal Corporation from 1951 until its production ended in 1991. [1] It is a unidirectional, rotating siren with a large square-shaped horn, and can come in various colors, usually yellow, by request.
TWS 295 Sirens, HSS Engineering siren Warning System Federal Signal Thunderbolt 1003 There are 8,200 alarm sirens for civil protection throughout Switzerland. They are tested once a year on the first Wednesday in February. [1]
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Federal_Signal_Thunderbolt_1003_video.ogv (Ogg multiplexed audio/video file, Theora/Vorbis, length 3 min 55 s, 720 × 480 pixels, 719 kbps overall, file size: 20.09 MB) This is a file from the Wikimedia Commons .
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Started off using a direct drive 25HP Roots blower with a square horn, redesigned to a belt drive 30 HP blower with round horn. All known recordings are 8/10 port ratio. 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
Civil defense logo on an Air raid siren control box in Kansas, US Civil Defense logo on a Thunderbolt 1003 siren. Mitigation is the process of actively preventing war or the release of nuclear weapons.