About: http://webisa.webdatacommons.org/20517107

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	Materials other than steel had small iron armatures affixed so that there would be response to the magnets.
http://www.w3.org/ns/prov#wasQuotedFrom	120years.net