CPC Main Group
G04G 21/00 Input or output devices integrated in time-pieces
4 direct subcodes
Child Classifications
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- G04G 21/02 Detectors of external physical values, e.g. temperature
- G04G 21/04 using radio waves (radio-controlled time-pieces G04R)
- G04G 21/06 using voice
- G04G 21/08 Touch switches specially adapted for time-pieces