About: http://webisa.webdatacommons.org/269362665

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	In the 1700s, cast iron was a cheap, easily obtained, metal for which mass production processes had already been developed.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com