About: http://webisa.webdatacommons.org/32505133

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	Metal contacts are made of metal or metal alloy materials, such as but not limited to aluminum (Al), chromium (Cr), platinum (Pt), gold (Au), nickel (Ni), silver (Ag), tungsten (W), titanium (Ti), tantalum (Ta) and copper (Cu).
http://www.w3.org/ns/prov#wasQuotedFrom	freshpatents.com