About: http://webisa.webdatacommons.org/38008385

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 ball and socket coupling 74 is operative to permit the pad 72 to tilt with respect to the shaft 76 so as to be in contact with the optical surface being polished regardless of whether the surface is planar or curved.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com