About: http://webisa.webdatacommons.org/139022352

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	Optical-element apparatus 14 may be configured to move, sequentially, optical elements into the light path so that the light beam has varying characteristics, such as varying colors or polarization.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com