Access alarming method and apparatus for working vehicle
Acoustic object detection system and method
Acoustic pool monitor with sequentially actuated multiple transd
Acoustic reflectometer for sheet feed sensing
Acoustically monitored shopper traffic surveillance and security
Acoustically monitored site surveillance and security system for
Alarm system responsive to intrusion induced phase unbalance
Apparatus for and method of doppler motion detection with standi
Apparatus for and method of doppler motion detection with standi
Apparatus for detecting objects
Apparatus for detecting the discharge of a firearm and transmitt
Area intrusion adjustable detector unit
Area surveillance system
Automatic detection and classification device
Automatic echo detection and classification system
Automatic level sensing system
Automatic sensitivity level adjustment
Circuit arrangement for ultrasonic burglar security systems oper
Circuit arrangement of an ultrasonic-presence motion detector, p
Coded acoustic alarm transmitter/receiver system