Method for measurement of duration of molten state for...
Second hand reset device for a timepiece
Second hand reset device for a timepiece
Stop watch
Stop watch including a time indicator
System for the control of a wheel for driving in rotation a chro
Time piece chronograph clockwork movement
Timepiece Hammer
Timepiece including a mechanism for correcting a device...
Timepiece with a chronograph mechanism
Two-state chronograph with switching means
Underwater electromechanical timer
Zero reset device for two time counters
Zero-resetting device for a timepiece