(under subclass 135) Subject matter wherein the circuitry is responsive to acoustic energy generated by the emplacement of a body within the region of sensitivity of the transducer.
(1) Note. Subject matter of this subclass type includes, for example, intrusion alarms.
SEE OR SEARCH THIS CLASS, SUBCLASS:
93, for intrusion alarms responsive to disturbances in an acoustic wave field.
SEE OR SEARCH CLASS
340, Communications: Electrical,
566, for nonacoustic wave-type vibration detectors used to detect the intrusion or movement of a vibration producing body.
