Wierd siren question

topic posted Sun, May 4, 2008 - 9:46 PM by  doctor 		Share/Save/Bookmark
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So I'm watching COPS tonight and they where with Pierce County Sheriffs Dept. (Washington State) and I noticed that all of the cops have some sort of siren that puts some sort of weird ringing/oscilationg tone about every 6 seconds during what sounds like a typical wail. Does anyone know what kind of siren that is?
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doctor
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Washington, D.C.
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