About: http://webisa.webdatacommons.org/15545184

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 material rubs mostly against itself, rather than the metal surfaces of the machine.
http://www.w3.org/ns/prov#wasQuotedFrom	ptonline.com