| 968 / | HD | HOROLOGY |
| 103 | DD | MECHANISMS FOR STABILIZING FREQUENCY (magnetic subclass 497; in striking mechanisms subclass 224; stopping and regulating of the running subclass 234; electrical and thermoelectric regulating mechanisms subclass 496) [G04B 17/00] {8} |
| 107 | DD | .~ Oscillators acting by spring tension [G04B 17/04] {4} |
| 109 | DD | .~.~ Oscillators with hairsprings, e.g., balance, etc. (electrically driven balances subclass 466; contacts actuated by a balance subclass 546) [G04B 17/06] {2} |
| 111 | | .~.~.~ Manufacture of the spiral spring (locking of the spiral spring by the regulating lever subclass 121; spiral spring with temperature compensation subclass 129; fixation of the spiral spring on the collet subclass 135; mainspring subclass 10) [G04B 17/06C] |