About: http://webisa.webdatacommons.org/196843629

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	A preferred boundary marking device is a laser or other type of light source.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com