About: http://webisa.webdatacommons.org/340615753

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	Reference is also to be made to the circuit shown in FIG. 5B, the circuit including components which monitor and detect video presence and absence during program segments, in particular commercial message segments.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com