About: http://webisa.webdatacommons.org/123724721

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	U.S. Pat. No. 4,456,793 to Baker et al. shows a computer with an optical link and an optical transceiver mounted in a ceiling or other high place.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk