| 968 / | HD | HOROLOGY |
| 73 | | CLICK DEVICES; STOP CLICKS; CLUTCHES (mechanisms for winding up by hand subclass 23; automatic winding up subclass 40;) [G04B 11/00] {4} |
| 74 | DD | .~> Devices in which the motion of a rotating member is limited to one direction [G04B 11/00B] {3} |
| 79 | DD | .~> Ratchet construction for driving rotating members in one direction, e.g., a ratchet on an oscillating member driving a ratchet wheel, etc. [G04B 11/00C] |
| 80 | DD | .~> 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} |
| 83 | DD | .~> Clutch mechanism between two rotating members with transfer of movement in only one direction (free running devices) [G04B 11/00F] {1} |