About: http://webisa.webdatacommons.org/417323427

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 an alternative embodiment, the glides may be made of plastic or any suitable materials having a composite, impregnated, or homogeneous composition or other structure intended to provide a low friction interface with the rail.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com