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6 Inches Red Security Bell Internal Strike Bell, Alarm Bell, Fire Alarm Bell Company for School Station Warehouse(24V, Blue) - Amazon.com
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12V 6inch 150mm Red Iron Fire Alarm Bell Factory School Garage Electric Bell | eBay
Fire alarm bell and strobe Photograph by Ben Schumin - Pixels
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Gentex GB6-120 120VAC 6-in Fire Alarm Bell 85 dBA at 10 feet