| 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} |
| 125 | DD | .~ Compensation of mechanisms for stabilizing frequency [G04B 17/20] {4} |
| 131 | | .~.~ For the effect of variations of the impulses [G04B 17/26] |