About: http://webisa.webdatacommons.org/397441490

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 projection system as described above usually comprises one or more, for instance six, optical elements, such as lenses and/or mirrors.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com