- Optical instruments and apparatus (3)
- Lenses, optical: all types except ophthalmic (1)
- Microscopes, except electron, proton, and corneal (1)
- Telescopes: elbow, panoramic, sighting, fire control, etc. (2)
- Optical test and inspection equipment (1)
- Prisms, optical (1)
- Reflectors, optical (1)
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