About: http://webisa.webdatacommons.org/54180174

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, a spring or other biasing mechanism can be attached to head 16 to urge it forward, regardless of the location of the center of gravity within the head.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com