About: http://webisa.webdatacommons.org/98832300

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	Short-range radio transmitters can similarly be used to send sounds, vibrations, or other signals to receivers worn on the persons of individuals who may be unable to detect other speaker amplifier signals.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com