About: http://webisa.webdatacommons.org/315064032

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	In accordance with yet a further feature of the invention, one of the two voltages, preferably a d-c voltage, serves as a reference value for suppressing part of the other voltage to be measured.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com