About: http://webisa.webdatacommons.org/396763832

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	Then the entire filter assembly can be covered with gravel in which plants are planted and on which stones or other objects can be placed.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com