About: http://webisa.webdatacommons.org/14673373

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 disc-like element is attached to the tubesheet, by means such as by welding, to function as a hold down element to hold the filter element in place, sealed against the tubesheet and sealed against the hold down element.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk