About: http://webisa.webdatacommons.org/228035740

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 yet another aspect of the invention, the reduced-friction surface is textured metal, preferably textured steel, coated with a slippery substance such as a thermoplastic polymer, for example polytetrafluoroethylene.10-17-2013
http://www.w3.org/ns/prov#wasQuotedFrom	faqs.org