About: http://webisa.webdatacommons.org/85490574

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 upper and lower chains of each pair are respectively synchronized by any suitable means, for example by gears or chain and sprocket means (not shown) such that all sprocket wheels 16 rotate at substantially the same speed.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es