About: http://webisa.webdatacommons.org/316984484

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	An apparatus according to claim 6, further including drive means for moving one of two sample members in a direction of the pitch of the diffraction grating when said difference signal to said indicator is other than a zero.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr