About: http://webisa.webdatacommons.org/219347613

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	Typically, these materials will be made of silicon dioxide or other glass-like material which are conventional in this art.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com