About: http://webisa.webdatacommons.org/99841461

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	Of note, copper itself is a toxic metal and it should only be used in products that contain that bind to copper.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com