| 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} |
| 588 | DD | .~ Producing the signals at adjustable fixed times [G04C 21/16] {7} |
| 596 | | .~.~ By closing a contact to put into action electro-acoustic means, e.g., awakening by music, etc. [G04C 21/28] |