About: http://webisa.webdatacommons.org/166713424

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 system can be used over large distances, e.g. over four meters, with an uncertainty of less than one part per million.
http://www.w3.org/ns/prov#wasQuotedFrom	nist.gov