About: http://webisa.webdatacommons.org/101340199

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	They include almost no chemical elements other than iron and carbon, so they can be forge welded without flux.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.jp