DIFF Subgroup
B06B 1/0292 Full Title
Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency > making use of electrical energy (B06B1/18, B06B1/20 take precedence)
B06B 1/0292 Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency > making use of electrical energy (B06B1/18, B06B1/20 take precedence)