About: http://webisa.webdatacommons.org/287313502

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 rigid member may be made for example from metal or synthetic resins or glass and need only be transparent in so far as it is to be positioned over the light-sensitive surface of the photo-cell.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com