G04C3/027 - CPC Classification

Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a pendulum using electromagnetic coupling between electric power source and pendulum

• G04C3/0271 » {the pendulum controlling contacts and mechanically driving the gear-train } 0
• G04C3/0273 » {the pendulum controlling contacts, thereby electromagnetically driving the gear-train or several gear-trains } 0
• G04C3/0275 » {the pendulum controlling contacts, the pendulum driving electro-magnet simultaneously driving the gear-train} 0
• G04C3/0276 » {the pendulum controlling indirectly, i.e. without mechanical connection, contacts, e.g. by magnetic or optic means} 0
• G04C3/0278 » {the pendulum controlling the gear-train by means of static switches, e.g. transistor circuits} 0