About: http://webisa.webdatacommons.org/42084724

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 free floating ring 13, which may be formed of graphite or other suitable material, is provided with a circumferential bevelled surface 14 similar to that described in the previous embodiment of FIG. 1.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com