About: http://webisa.webdatacommons.org/81532854

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	Element 535 is a ball, such as a roll ball, mouse, guide or track ball, which would allow the user to move a cursor
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com