About: http://webisa.webdatacommons.org/159474136

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	The filter unit preferably consists of a spring member42 in the form of a helix enclosed within and supporting a filter bag 43 formed of suitable filtering material, such as cotton flannel or the like.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com