Explanatory notes
… hollowing, etc.). These are classified according to their constituent material. The clock or watch parts of this … balance staff, hairspring (flat, Bréguet, cylindrical), tuning‑fork, stud, collet, regulator, index stud, end‑stone … only worked stones (jewels), i.e., those which have been turned, cut, polished, drilled, hollowed, etc., or mounted …