About: http://webisa.webdatacommons.org/27730540

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	It is to be further noted that when equipment such as a pump operates with a negative pressure head, the stuffing box 14 is under a vacuum.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com