IPC Main Group
G04G 13/00 Producing acoustic time signals
Introduced: January 1980
Last revised: January 2006
Classification Context
- Section:
- PHYSICS
- Class:
- HOROLOGY
- Subclass:
- ELECTRONIC TIME-PIECES
1 direct subcode
Child Classifications
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- G04G 13/02 at preselected times, e.g. alarm clocks