About: http://webisa.webdatacommons.org/76760873

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	A trackball device as recited in claim 1 wherein said force is a contact force that is provided by driving a moving element that contacts said user using said actuator. 8.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com