About: http://webisa.webdatacommons.org/121920325

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	rfect seal between such mechanical elements as a valve member and a seat against which it closes and particularly to a machine for forming a so-called spherical lap.
http://www.w3.org/ns/prov#wasQuotedFrom	woodlandjournal.com