About: http://webisa.webdatacommons.org/37898946

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	The mechanical variable optical attenuators have moving parts such as stepper motors to adjust an optical filter to vary the attenuation.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com