About: http://webisa.webdatacommons.org/32805506

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	A common technique is to hook a transmitter to an access point on the utility being traced, such as a water meter, electrical switch box, etc., and to apply thereto an electrical signal of a known alternating current frequency.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com