About: http://webisa.webdatacommons.org/436401531

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 invention is a loading mechanism which can be actuated by conventional holddown screws to simultaneously apply a balanced preload to both sealing devices of a dual crossover seal assembly in an annulus of a pressurized wellhead.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com