About: http://webisa.webdatacommons.org/226465599

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	Since the end of the 19th century, the predominant drilling bit used in conventional commercial drilling of wells to discover and produce hydrocarbons and other substances has been the rotary drill bit.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com