About: http://webisa.webdatacommons.org/109383572

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	In some implementations, the object is a magnet or other object that is detectable by the first and second sensors.
http://www.w3.org/ns/prov#wasQuotedFrom	freshpatents.com