About: http://webisa.webdatacommons.org/428887828

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	optical system of the apparatus according to the invention is a modification of the so-called Littrow-system.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com