About: http://webisa.webdatacommons.org/326379955

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	Optical elements such as lenses, e.g. meniscus lenses, are normally circularly ground on the outside diameter.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com