About: http://webisa.webdatacommons.org/217099239

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	To this end, the variable input means may include an input device such as a keyboard or keypad which could be used to input information which would effect the modulation means so as to vary the modulated signal.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es