About: http://webisa.webdatacommons.org/141978461

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	Also in this embodiment, the light emitter 180 is an LED and the light receiver 182 is a phototransistor, but either may also be any other device that emits or receives light as described herein or known in the art.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es