IPC Subgroup
G02B 25/04 affording a wide-angle view, e.g. through a spy-hole
Introduced: September 1968
Last revised: January 2006
Full Title
Eyepieces; Magnifying glasses > affording a wide-angle view, e.g. through a spy-hole
Classification Context
- Section:
- PHYSICS
- Class:
- OPTICS
- Subclass:
- OPTICAL ELEMENTS, SYSTEMS OR APPARATUS