About: http://webisa.webdatacommons.org/362299503

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 compound objective may be cast, pressed, etched, or ground out of glass, plastic, quartz, or other materials well known as suitable for lens manufacture.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca