DIFF Main Group
G04G 21/00 Input or output devices integrated in time-pieces
Introduced: January 2010
IPC and CPC are identically structured here. All 4 subcodes exist in both systems.
1 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 2010.
Child Classifications
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- G04G 21/02 Detectors of external physical values, e.g. temperature since 2010 +1 CPC IPC+CPC Available in IPC and CPC
- G04G 21/04 using radio waves (radio-controlled time-pieces G04R) since 2010 IPC+CPC Available in IPC and CPC
- G04G 21/08 Touch switches specially adapted for time-pieces since 2010 IPC+CPC Available in IPC and CPC