| http://www.w3.org/ns/prov#value | - Siren-based systems do attract everyone???s attention, but in a system that handles multiple types of hazards, a source for simple instructions is important. ???Giant Voice communicates to the largest amount of people in the shortest amount of time,??? says Chris Roller, sales manager for American Signal Corp. ???The concept of outdoor warning, however, is to get people???s attention and use the v
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