About: http://webisa.webdatacommons.org/425188735

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	Also, pressure sensitive switch 56 and accumulator 50 are arranged to activate electrically operable pump 48 and maintain pressure in line 46 at a predetermined level, such as at 40 psi, as indicated in FIG. 2.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com