Method and system for identifying moving objects using...
Method for selecting the mode of operation of an object counting
Method of, and circuit arrangement for, function control of ultr
Method of, and circuit arrangement for, function control of ultr
Mounting apparatus for the sonic transducer of a fish-finder
Movement-detecting processing circuit for an ultrasonic detectio
Moving object detecting device
Moving object detection system
Near ultrasonic pattern comparison intrusion detector
Non-contacting liquid level detection system
Object detecting system of reflection type
Object detector which compares returned signals from successive
Pattern comparison ultrasonic surveillance system with noise sup
Portable security system for outdoor sites
Reflective object detector with compensated receiver signal
Security door with improved sensor for detecting unauthorized pa
Security door with improved sensor for detecting unauthorized pa
Sensor for detecting moving object with the aid of a...
Sonic identification system and method
Space surveillance apparatus with sound source and method of sho