| 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} |
| 589 | | .~.~ By mechanically unlocking an electromechanical vibrator, e.g., actuated by the leakage flux of the electric driving means, etc. [G04C 21/18] {1} |
| 590 | DD | .~.~.~> Provided with means for sheeting off or temporarily stopping the signal [G04C 21/20F] |