About: http://webisa.webdatacommons.org/336037733

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	Windows 48, 50 are made of a suitable material, such as fused silica, although other materials, such as optical glasses, could also be used.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com