Ultra-sonic dog-expelling device

Ultra-sonic pest control apparatus

Ultrasonic animal deterrent for protecting an area

Ultrasonic pest repellent method and system

Ultrasonic pest repeller

Ultrasonic rodent control device and method

Ultrasonic transmitter for the remote control of radio and telev

Unipolar wide-range current-to-frequency converter

Unitary key panel

Universal analog signal to digital signal interface

Universal analog-to-digital converter using the same information

Universal binary code converter

Universal replacement horn

Universal system of encoding chinese characters and its keyboard

Untrimmed 12 bit monotonic all capacitive A to D converter

Use of single reference voltage for analog to digital or digital