US PATENT SUBCLASS 968 / 934
.~.~.~.~ Using means to adjust the display in accordance with the ambient light, e.g., switching or controlling a supplementary light source, etc. [G04G 9/00D1C2]


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968 /   HD   HOROLOGY

925  DD  VISUAL TIME- OR DATE-INDICATION MEANS [G04G 9/00] {9}
929  DD  .~ By light valves in general (subclasses 950 and 962 take precedence; electro-, magneto-, or acoustic-optic devices in general G02F 1/00) [G04G 9/00D] {1}
930  DD  .~.~ Details [G04G 9/00D1] {2}
933  DD  .~.~.~ Electrical, e.g., selection or application of the operating voltage, etc. [G04G 9/00D1C] {1}
934.~.~.~.~ Using means to adjust the display in accordance with the ambient light, e.g., switching or controlling a supplementary light source, etc. [G04G 9/00D1C2]