About: http://webisa.webdatacommons.org/76148056

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 driving mechanism such as a hydraulic piston or a mechanical screwdrive drives a driving wedge parallel to the borehole which in turn drives contact wedges which are dovetail to the driving wedge out into contact with the wellbore.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com