About: http://webisa.webdatacommons.org/414748611

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	Prior art sound systems are conventionally implemented with special-purpose analog circuitry and controlled with analog devices such as potentiometers and switches and having displays implemented with analog meters.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk