About: http://webisa.webdatacommons.org/372805973

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	o acoustical signalsUS 3836959 AAbstract The disclosed embodiment of the present invention is a system which is responsive to the ringing tones of a telephone instrument for controlling the energization of one or more remote devices.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com