About: http://webisa.webdatacommons.org/50818118

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 transparent sheets 82 and 84 can be selected from appropriate materials such as quartz crystal, fused silica, diamond, sapphire and the like.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com