About: http://webisa.webdatacommons.org/299825950

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	Accordingly, what is desired and is an objective of the present invention is to provide a drill collar structure that has sufficient structural rigidity to withstand the rigors of drilling.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr