US PATENT SUBCLASS 968 / 927
.~.~ Using coded signals (synchronization combined with automatic setting at regular intervals, e.g., by coded signals, etc. subclass 920) [G04G 9/00B2]

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968 /   HD   HOROLOGY

925  DD  VISUAL TIME- OR DATE-INDICATION MEANS [G04G 9/00] {9}
926  DD  .~ Transmission of control signals [G04G 9/00] {1}
927.~.~ Using coded signals (synchronization combined with automatic setting at regular intervals, e.g., by coded signals, etc. subclass 920) [G04G 9/00B2]