About: http://webisa.webdatacommons.org/52294833

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The coded signals are generated and short wave transmitted to a radio receiver at a central location such as a police or security service monitor station.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com