About: http://webisa.webdatacommons.org/166925110

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 signal may be visual, for example a light, or it may be an audio signal or a speech processor within the device stating North, South, etc. to identify the location to which the card is to be delivered.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com