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| {{Infobox siren
| | #REDIRECT [[Federal Signal Model 5]] |
| |title = C3 1/2
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| [[File:Image (2).jpg|thumb|Original advertisements (?) for the Model 7, circa. late 1970's]]
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| |company =[[Federal Signal Corporation]]
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| |produced = 1938-1987
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| |type =[[Electromechanical]]
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| |output =113 or 108<ref name="manual">
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| {{cite manual
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| |title=Service Manual for Models 2, 7, SD10, STH10, STL10 |url=http://www.civildefensemuseum.org/sirens/manuals/2-5-SD10-STH10-STL10-255A154F.pdf
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| |format=PDF
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| |publisher=Federal Signal Corporation
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| |accessdate=October 22, 2017
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| |deadurl=no
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| }}</ref>
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| |hertz =690 (Single Tone) 690/517.5 (Dual Tone) <ref name="manual" />
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| |neigh =7.5<ref name="manual" />
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| |manual = http://www.civildefensemuseum.org/sirens/manuals/2-5-SD10-STH10-STL10-255A154F.pdf
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| }}
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| The C3 1/2, or commonly known as Model 7 or Model 5 was a 5, 7.5, and sometimes 10 horsepower, mechanical, omnidirectional siren produced by [[Federal Signal Corporation]]. The rotor in the C3 1/2 is 18" and shares it with the [[500DHTT]].
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| Model 7 was available in 3 different chopper configurations: 8 port single tone, 12 port single tone, and 9/12 port dual tone. The siren was housed in a very simple enclosure that resembles an air vent found on building roofs. The housing came in either painted steel or stainless steel.
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| [[Category:Dual Toned Sirens]][[Category:Electromechanical Sirens]][[Category:Single Toned Sirens]][[Category:Federal Signal Corporation]] | | [[Category:Dual Toned Sirens]][[Category:Electromechanical Sirens]][[Category:Single Toned Sirens]][[Category:Federal Signal Corporation]] |
| [[Category:Omnidirectional Sirens]] | | [[Category:Omnidirectional Sirens]] |
| [[Category:Sirens]] | | [[Category:Sirens]] |