US PATENT SUBCLASS 968 / 939
.~ By building up characters using a combination of indicating elements and by selecting desired characters out of a number of characters or by selecting indicating elements the positions of which represent the time (this subclass is a combination of subclasses 942 and 954) [G04G 9/00H]

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968 /   HD   HOROLOGY

925  DD  VISUAL TIME- OR DATE-INDICATION MEANS [G04G 9/00] {9}
939.~ By building up characters using a combination of indicating elements and by selecting desired characters out of a number of characters or by selecting indicating elements the positions of which represent the time (this subclass is a combination of subclasses 942 and 954) [G04G 9/00H] {2}
940  DD  .~.~> By controlling light sources, e.g., electroluminescent diodes, etc. [G04G 9/00H2]
941  DD  .~.~> Using light valves, e.g., liquid crystals, etc. [G04G 9/00H3]