ELECTROMECHANICAL TRANSDUCERS INCORPORATING A PIEZOELECTRIC COMPONENT FOR USE AS SENSORS, ACTUATORS AND POSITIONERS; PIEZOELECTRIC DEVICES FOR EFFECTING MECHANICAL AND ELECTRICAL CONTROL, SENSING AND OPERATION, OF VALUES, SOLENOIDS, RELAYS, SWITCHES, MOTORS, GENERATORS, CHARGERS, TRANSFORMERS, PUMPS, COMPRESSORS, GYROSCOPES, SENSORS FOR DISPLACEMENT, VELOCITY AND ACCELERATION, AND OPTICAL APPARATUS; SUCH PIEZOELECTRIC DEVICES FOR USE WITH CAR MIRRORS, HEAD-LAMP DIPPING SYSTEMS, CAR DOOR LOCKS...