179716 ⎘
Apparatus for measuring unknown time intervals by mechanical means using a mechanical oscillator running only during the time interval to be measured, e.g. stop-watch with start-stop control arrangements
TIMEPIECE COMPRISING A CHRONOGRAPH MECHANISM PROVIDED WITH A DEVICE INDICATING THE OPERATING STATUS OF THE CHRONOGRAPH MECHANISM
MECHANICAL STOP AND START SYSTEM FOR A FUNCTION, AND WATCH COMPRISING SUCH A SYSTEM