About: http://webisa.webdatacommons.org/18679058

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	Several systems for projecting advertising images onto a display surface, including for outdoor advertising such as billboards, have been previously described.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com