About: http://webisa.webdatacommons.org/187958123

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	where n is a number dependent upon the specific display, and ???n indicates a pulse having the same length as a pulse n but of opposite polarity.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca