About: http://webisa.webdatacommons.org/128344580

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	produced from glass, plastic or other optically transparent material and also from nontransparent material having slots and/or holes, or may be formed as a diffractive optical element.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com