About: http://webisa.webdatacommons.org/405347288

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	The Invar cavity surface is coated with a low sputtering, electrically conductive material such as aluminum, beryllium or the like.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com