About: http://webisa.webdatacommons.org/216432932

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	While the invention has been described in this specification in relation to down hole safety valves which fail safe closed, it could be used for actuating any down hole equipment, including equipment or valves which fail safe open.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com