About: http://webisa.webdatacommons.org/215497066

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	Such a piston container is expediently loaded after placement with high density material, e.g., lead or other heavy metals, rock, or a combination of the two.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com