IPC Subgroup
G02B 27/16 used as aids for focusing
Introduced: September 1968
Last revised: January 2006
Full Title
Optical systems or apparatus not provided for by any of the groups , > Beam splitting or combining systems > used as aids for focusing
Classification Context
- Section:
- PHYSICS
- Class:
- OPTICS
- Subclass:
- OPTICAL ELEMENTS, SYSTEMS OR APPARATUS