Electronic systems, namely, radio frequency transmitters, radio frequency receivers, microwave frequency detectors, and infrared sensors for transmitting and receiving radio frequency signals and for detecting, measuring, and sensing the presence of people and objects for the purpose of controlling automatic doors, garage doors, emergency doors, industrial doors, door locks, window locks, electronic padlocks, electronic access devices, lighting controllers, signal lights, status lights, warning lights, electronic sensing devices, and traffic control devices.
Electrical and Scientific Apparatus