About: http://webisa.webdatacommons.org/51754346

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 general thickness of the retardation layers is 10 to 500 ??m, and particularly 20 to 200 ??m, for monolayer ones, but is not limited thereto.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca