About: http://webisa.webdatacommons.org/166658732

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 viewing tube further includes a viewing lens 20 and a line of sight lens 22, which lenses may be made of clear plastic, such as an acrylic plastic material, glass or other similar transparent material.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com