| 968 / | HD | HOROLOGY |
| 906 | DD | SETTING, I.E., CORRECTING OR CHANGING THE TIME-INDICATION (synchronization combined with automatic setting at regular intervals, e.g., by coded signals, etc., subclass 920) [G04G 5/00] {5} |
| 910 | DD | .~ By temporarily changing the number of pulses per unit time, e.g., quick-feed method, etc. [G04G 5/02] {2} |
| 913 | | .~.~ By adding or suppressing individual pulses, e.g., for step-motor, etc. [G04G 5/02C] |