About: http://webisa.webdatacommons.org/239239949

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	BRIEF DESCRIPTION OF THE DRAWINGS One form of the invention is shown in the drawing, in which- FIG. 1 is a section through a portable filter unit, and FIG. 2 is a top view thereof.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com