About: http://webisa.webdatacommons.org/80376588

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	If the underreaming arms do not retract before the underreamer is lifted from the hole, it is because there is a malfunction, or the arms have been wedged open by dirt or debris or other matter collecting under the cutter arms.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es