IPC Subgroup
G02C 7/06 bifocal; multifocal
Introduced: September 1968
Last revised: January 2006
Full Title
Optical parts > Lenses; Lens systems > bifocal; multifocal
Classification Context
- Section:
- PHYSICS
- Class:
- OPTICS
- Subclass:
- SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES