Explanatory notes
… watch chains, ball bearings and bearing balls (e.g., for self‑winding watches). (2) Parts of general … plates), bridges (of the barrel, centre wheel, third wheel, fourth wheel, balance‑wheel (cock), escapement, setting … staff, hairspring (flat, Bréguet, cylindrical), tuning‑fork, stud, collet, regulator, index stud, end‑stone cap or …