| 968 / | HD | HOROLOGY |
| 580 | DD | PRODUCING ACOUSTIC TIME SIGNALS BY ELECTRICAL MEANS (for mechanical clocks or watches subclasses 225 and 243) [G04C 21/00] {3} |
| 581 | | .~ Constructional details (subclasses 582 and 588 take precedence) (sound- producing devices in general G10K, e.g., 1/00) [G04C 21/02] |