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- Manufacture of optical instruments such as binoculars, monoculors, other optical telescopes and their mountings; optical astronomical instruments; compound optical microscopes; including those for photomicrography and micro-projection; other optical appliances and instruments (6)
- Manufacture of optical elements of glass or of any material; prisms and lenses, mirrors constituting optical elements; colour filters, polarizing elements; opthalmic lenses, including contact lenses; optical fibres and cables of optical fibres not individually sheathed [(manufacture of optical sheathed fibres is classified in class 3130)glass (except mirror glass) and lenses (2)
- Manufacture of other photographic, cinematographic and optical instruments and apparatus n.e.c.: image projectors, enlargers and reducers including microfilm readers; and apparatus for photographic or cinematographic laboratories) (2)
- Manufacture of specialized parts and accessories for photographic/cinematographic and optical instruments, n.e.c. (e.g. discharge lamps and other flashlight apparatus, but not flash bulbs; projection screens etc.) (1)