<http://webisa.webdatacommons.org/249074582> <http://www.w3.org/ns/prov#wasQuotedFrom> <google.com> . <http://webisa.webdatacommons.org/249074582> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> . <http://webisa.webdatacommons.org/249074582> <http://www.w3.org/ns/prov#value> "Top sheet 20 and bottom sheet 22 normally contact the surface of valve strip 28 when no air or other substance (e.g., water) is in either passageway." . <http://webisa.webdatacommons.org/prov/466426591> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/249074582> .