About: http://webisa.webdatacommons.org/139223359

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	Typically the signals are converted by optically active devices, for example an electrically operated light source such as a light emitting diode or a light detecting element such as a photosensitive diode or transistor.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com