About: http://webisa.webdatacommons.org/284287153

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	At least one known prior art vehicle charging system uses an additional electrical wire connected between the charger and the vehicle other than the current carrying wires to detect when the vehicle is plugged into the charger.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com