US PATENT SUBCLASS 968 / 935
.~ Using a cathode-ray tube as display device (displaying supplementary information, such as, time on TV screen H04N 5/445) [G04G 9/00E]
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968 /
HD
HOROLOGY
925
DD
VISUAL TIME- OR DATE-INDICATION MEANS [G04G 9/00]
{9}
935
.~ Using a cathode-ray tube as display device (displaying supplementary information, such as, time on TV screen H04N 5/445) [G04G 9/00E]
