About: http://webisa.webdatacommons.org/355088240

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	An annular groove 140 in the top surface of the outer enclosure 32 may receive an O-ring or other sealing device to seal vacuum chamber sections not related to zone seals.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr