179658 ⎘
Measuring, counting, calibrating, testing or regulating apparatus for balance wheels for balancing by setting adjustable elements, e.g. balance wheel screws
Horological resonator mechanism with inertial mass with adjustment of inertia and/or unbalance
#2Timepiece mechanism with adjustable inertia balance wheel
#3Timepiece mechanism with adjustable inertia balance wheel
#4Mechanism for regulating the rate of a timepiece oscillator