About: http://webisa.webdatacommons.org/233712956

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	The walls of the opening might be coated with an insulator and then the opening is filled with metal or other conductive material.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es