About: http://webisa.webdatacommons.org/177553122

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	device including an operation key, a button switch, and the like.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com