About: http://webisa.webdatacommons.org/338495870

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 cover plate 2 may be an optical window or aperture and may comprise silicon, glass, plastic, metal or metal alloys, such as Kovar (???), or other suitable material.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com