System for detecting the end useful life of a battery in an elec
System for signalling the termination of the lifetime of a batte
Time keeping apparatus and control method therefor
Time-keeping instrument, in particular an analog-type electric w
Timepiece comprising a mechanism driven by mechanical driving me
Timepiece device mechanism for indicating restart after rechargi
Timepiece having a power reserve indicator
Timepiece including an electric power generator
Timepiece using spring as power
Timepiece with power reserve indication