About: http://webisa.webdatacommons.org/252358916

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	This is required in order to complete the circuit and/or to assure that only the proper polarity of the tip-ring voltage will cause the indicator lamp or other element to light.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com