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System Sensor of St. Charles, Ill., has expanded its SpectrAlert Advance audible/visible notification appliance to include a line of mass notification system (MNS) devices and accessories.
The SpectrAlert advance low-frequency sounders and sounder strobes by System Sensor of St. Charles, Ill., are the first notification appliances to meet the new NFPA 72 2010/2013 low-frequency ...
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