About: http://webisa.webdatacommons.org/283094583

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	The invention relates more particularly to an improved ultra-sonic method and apparatus for detecting the presence of an intruder in a protected space or certain other environmental changes.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com