IPC Subgroup
G04B 39/02 Sealing crystals or glasses
Introduced: January 1980
Last revised: January 2006
Full Title
Watch crystals; Fastening or sealing crystals; Clock glasses > Sealing crystals or glasses
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