| 968 / | HD | HOROLOGY |
| 73 | DD | CLICK DEVICES; STOP CLICKS; CLUTCHES (mechanisms for winding up by hand subclass 23; automatic winding up subclass 40;) [G04B 11/00] {4} |
| 80 | | .~ Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power [G04B 11/00D] {2} |
| 81 | DD | .~.~> With friction member, e.g., with spring action, etc. [G04B 11/00D4] |
| 82 | DD | .~.~> With magnetic elements [G04B 11/00D5] |