IPC Subgroup
G04C 21/04 Indicating the time of the day
Introduced: September 1968
Last revised: January 2006
Full Title
Producing acoustic time signals by electrical means > Indicating the time of the day
Classification Context
- Section:
- PHYSICS
- Class:
- HOROLOGY
- Subclass:
- ELECTROMECHANICAL CLOCKS OR WATCHES
2 direct subcodes
Child Classifications
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- G04C 21/06 by striking mechanism
- G04C 21/12 by electro-acoustic means