About: http://webisa.webdatacommons.org/254343514

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	However, the signal means are complicated in shape, and circuitry is necessary for distinguishing the four kinds of signals corresponding to the four signal means.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com