DIFF Subgroup
B06B 1/167 Full Title
Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency > making use of mechanical energy (B06B1/18, B06B1/20 take precedence) > operating with systems involving rotary unbalanced masses
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.