About: http://webisa.webdatacommons.org/4000068

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	A control electrode, particularly the cathode or a grid, has the bias thereof controlled to turn the oscillator on and off at times which are symmetrical with respect to the peaks of the applied voltage.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es