| 968 / | HD | HOROLOGY |
| 564 | DD | INDICATING THE TIME OPTICALLY BY ELECTRIC MEANS (subclass 577 takes precedence; by mechanical means subclasses 139 and 162) [G04C 17/00] precedence; by mechanical means subclasses 139 and 162) [G04C 17/00] {6} |
| 567 | DD | .~ By flaps [G04C 17/00F] {2} |
| 569 | | .~.~ By a combination of different types of indicating devices, e.g., flaps and drums, etc. [G04C 17/00K] |