About: http://webisa.webdatacommons.org/196599098

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	On opposite sides of the ball member 12 and carried by the casing 13 are a pair of semi-spherical porous plates 24 and 25 formed of sintered metal or other porous material.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com