About: http://webisa.webdatacommons.org/260519846

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	It is known that an optical tracking target such as 56, with known dimensions and geometry, can be optically tracked for example by an optical locating system available from Northern Digital, Inc. (referenced previously).
http://www.w3.org/ns/prov#wasQuotedFrom	google.es