179729 ⎘
Apparatus for measuring unknown time intervals by mechanical means using a mechanical oscillator; Watches or clocks with stop devices, e.g. chronograph with start-stop control mechanisms with member having a rotational two-way movement, e.g. navette
Timepiece comprising a device for switching a timepiece mechanism
#2Chronometer with speed selector
#3Single push-piece chronograph
#4Timepiece comprising a chronograph mechanism
#5Chronograph