About: http://webisa.webdatacommons.org/98331891

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 vacuum chamber walls, the circumcorneal rings, and the support base may be made of a variety of materials including various plastics, metals, and pliable materials such as natural and synthetic rubbers.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es