About: http://webisa.webdatacommons.org/258690636

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	Drive ring 156 may be manufactured from a ceramic, or other similar material, in order to provide for the required friction with motor tip portions 80 while also limiting wear on the tip portions 180.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com