DIFF Subgroup
G04C 3/101 Full Title
Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means (clocks driven by synchronous motors G04C15/00) > wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork > driven by electromagnetic means
Of 3 combined children, 0 exist in both systems.
3 codes are CPC-only extensions.