About: http://webisa.webdatacommons.org/387333183

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	Refractive materials 102 and 104 comprise a lens, a rhomboid, a prism, or any other suitable configuration of optically transmissive material, such as glass.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca