About: http://webisa.webdatacommons.org/151367224

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 ??/2 wave plate is an optical device made of a slab of a doubly refracting crystal such as calcite or mica.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es