About: http://webisa.webdatacommons.org/138082213

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 leak detector retrieves valve position information (step 802) from, for example, a valve stem position sensor, control circuitry, or other elements adapted to monitor valve position.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com