About: http://webisa.webdatacommons.org/149344229

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	An amplifier arrangement as claimed in any one of the preceding claims and including means for modulating the pilot tone and means for demodulating said first and second output signals of said first and second multipliers.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com