About: http://webisa.webdatacommons.org/128486681

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	Periodically it is necessary to pull the drill string from the bore in order to change the drill bit or to run testing or other equipment into the bore on the end of the drill string.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com