US PATENT SUBCLASS 968 / 604
.~.~ Adjusting the duration of signals [G04C 21/38]


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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}
588  DD  .~ Producing the signals at adjustable fixed times [G04C 21/16] {7}
604.~.~ Adjusting the duration of signals [G04C 21/38]