About: http://webisa.webdatacommons.org/233468302

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 layer according to the present invention is a dual layer consisting of the lower layer having a lower resistance to the flow of water and the upper layer having a higher resistance to the flow of water.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com