About: http://webisa.webdatacommons.org/19863720

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	Symbols T1 and T2 are input terminals of the mixing circuit, T3 is an output terminal and T4 is a terminal for inputting a control signal voltage from the D/A converter 4.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com