- Optical instruments and apparatus (3)
- Binoculars (2)
- Microscopes, except electron, proton, and corneal (1)
- Telescopes: elbow, panoramic, sighting, fire control, etc. (1)
- Optical alignment and display instruments (1)
- Optical elements and assemblies, except ophthalmic (1)
- Prisms, optical (1)
- Reflectors, searchlight (1)
