About: http://webisa.webdatacommons.org/291516427

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	Good results were obtained if the sliding surfaces are made of a ceramic material such as silicon carbide (SiC), silicon nitride (Si3 N4), alumina (Al2 O3), or the like.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com