About: http://webisa.webdatacommons.org/95020217

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 apparatus of claim 8 wherein the reference surface is a concave spherical surface and the test surface is a concave aspherical surface.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com