driven by piezoelectric means; driven by magnetostrictive means

Full Title

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 mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork > driven by piezoelectric means; driven by magnetostrictive means

Classification Context

Section:

PHYSICS

Class:

HOROLOGY

Subclass:

ELECTROMECHANICAL CLOCKS OR WATCHES