IPC Main Group
G04C 21/00 Producing acoustic time signals by electrical means
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- PHYSICS
- Class:
- HOROLOGY
- Subclass:
- ELECTROMECHANICAL CLOCKS OR WATCHES
Related Keywords
electrically driven alarm clocks
3 direct subcodes
Child Classifications
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- G04C 21/02 Constructional details
- G04C 21/04 Indicating the time of the day
- G04C 21/16 producing the signals at adjustable fixed times