About: http://webisa.webdatacommons.org/273171218

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 only requirement is that the annular seal 20 must be mounted on the section which is the furthest downstream when the pig is placed in the pipeline.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com