About: http://webisa.webdatacommons.org/421014509

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 practice, however, a trackball is usually loosely operated by the operator, the wrist of the operator's hand resting on a solid base, for example a desk top.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com