About: http://webisa.webdatacommons.org/456522915

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	In this apparatus two radiation spots are formed on the information surface, which viewed in the direction of the tracks 2, are disposed at a short distance from each other, for example 10 ??m.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com