About: http://webisa.webdatacommons.org/410312138

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	One known type of castor, such as disclosed in British Patent No. 928,709, achieves a high mobility compared with other known types by having a wheel mounted at a camber angle relative to the swivel axis.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com