About: http://webisa.webdatacommons.org/393814189

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	A system according to claim 20 including separate means for varying the relative difference in pressures of said gas and said cleaning fluid during their turbulence in cleaning a duct.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com