About: http://webisa.webdatacommons.org/81866798

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	An improvement over this system was the introduction of lawn crypts or burial vaults, which may be of single or double depth, and which are of a strong, durable material such as concrete.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com