About: http://webisa.webdatacommons.org/428917821

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	Apparatus according to claim 18, further including a fourth filter oriented in a direction opposite to the orientation direction of the third filter.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com