| 968 / | HD | HOROLOGY |
| 925 | DD | VISUAL TIME- OR DATE-INDICATION MEANS [G04G 9/00] {9} |
| 929 | DD | .~ By light valves in general (subclasses 950 and 962 take precedence; electro-, magneto-, or acoustic-optic devices in general G02F 1/00) [G04G 9/00D] {1} |
| 930 | | .~.~ Details [G04G 9/00D1] {2} |
| 931 | DD | .~.~.~> Constructional [G04G 9/00D1B] {1} |
| 933 | DD | .~.~.~> Electrical, e.g., selection or application of the operating voltage, etc. [G04G 9/00D1C] {1} |