About: http://webisa.webdatacommons.org/137327882

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	In one embodiment of the invention, the outer peripheral surface of first anchoring element 4 has protrusions 53 that may take the form of ribs, threads, a plurality of raised points or other shapes.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com