About: http://webisa.webdatacommons.org/217717456

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	Other than the broadcasting signals, time reference signals used in electric wave clocks, etc., or signals, such as a.c. source signals, etc., which can be time reference may be used.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com