About: http://webisa.webdatacommons.org/137932346

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	The spring tip 29 can be formed in a manner described in U.S. Pat. No. 4,538,622 and is formed of a suitable radiopaque material such as tungsten or platinum or a combination of the two.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr