US PATENT SUBCLASS 968 / 580
PRODUCING ACOUSTIC TIME SIGNALS BY ELECTRICAL MEANS (for mechanical clocks or watches subclasses 225 and 243) [G04C 21/00]


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968 /   HD   HOROLOGY

580PRODUCING ACOUSTIC TIME SIGNALS BY ELECTRICAL MEANS (for mechanical clocks or watches subclasses 225 and 243) [G04C 21/00] {3}
581  DD  .~> Constructional details (subclasses 582 and 588 take precedence) (sound- producing devices in general G10K, e.g., 1/00) [G04C 21/02]
582  DD  .~> Indicating the time of the day (acoustic indication of time subclass 217) [G04C 21/04] {2}
588  DD  .~> Producing the signals at adjustable fixed times [G04C 21/16] {7}