About: http://webisa.webdatacommons.org/109463983

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 some instances the rail block can include bearings or other friction reducing means, such as a plastic, Teflon or other coating, that aid in the rolling or sliding of the rails through the block.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com