using torsion pendulums; using conical pendulums

Introduced: January 1980

Last revised: January 2006

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 pendulum > using torsion pendulums; using conical pendulums

Classification Context

Section:: PHYSICS
Class:: HOROLOGY
Subclass:: ELECTROMECHANICAL CLOCKS OR WATCHES