About: http://webisa.webdatacommons.org/431748880

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 addition, the signal generating source 1 need not be constituted by the optical means of light-emitting and light-receiving elements, but may be constituted by magnetic means such as a magnet and a magnetic sensor.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com