About: http://webisa.webdatacommons.org/178997376

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	Thermionic and field emission devices are well known and used in a variety of applications, such as cathode ray tubes, and field emission displays.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr