About: http://webisa.webdatacommons.org/56994635

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	A layer of gold or gold alloy or other light blocking material may be disposed on the expandable member for light control purposes.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk