About: http://webisa.webdatacommons.org/181233826

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 drum 503, a key device in this method, is made of a transparent material (e.g., glass and acrylics or other transparent plastics) and has a varying thickness.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com