US PATENT SUBCLASS 968 / 586
.~.~ By electro-acoustic time means [G04C 21/12]


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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}
582  DD  .~ Indicating the time of the day (acoustic indication of time subclass 217) [G04C 21/04] {2}
586.~.~ By electro-acoustic time means [G04C 21/12] {1}
587  DD  .~.~.~> Electro-acoustic time announcement, i.e., spoken [G04C 21/14]