About: http://webisa.webdatacommons.org/23945553

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	System of anti-aircraft defence adopted by the Germans in addition to other systems only used when weather or other conditions force the aeroplane to fly at such an height as to be within range.
http://www.w3.org/ns/prov#wasQuotedFrom	anu.edu.au