IPC Subgroup
G02B 3/12 Fluid-filled or evacuated lenses
Introduced: September 1968
Last revised: January 2006
Full Title
Simple or compound lenses > Fluid-filled or evacuated lenses
Classification Context
- Section:
- PHYSICS
- Class:
- OPTICS
- Subclass:
- OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
1 direct subcode
Child Classifications
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- G02B 3/14 of variable focal length