IPC Main Group
G04B 21/00 Indicating the time by acoustic means
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- PHYSICS
- Class:
- HOROLOGY
- Subclass:
- MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME-PIECES USING THE POSITION OF THE SUN, MOON, OR STARS
Related Keywords
CHIMES in clocks
1 direct subcode
Child Classifications
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- G04B 21/02 Regular striking mechanisms giving the full hour, half hour, or quarter hour