- Optical instruments and apparatus (5)
- Binoculars (1)
- Gun sights, optical (3)
- Microscopes, except electron, proton, and corneal (1)
- Periscopes (1)
- Telescopes: elbow, panoramic, sighting, fire control, etc. (1)
- Contour projectors (1)
- Gratings, diffraction (1)
- Interferometers (2)
- Light sources, standard (1)
- Optical test and inspection equipment (1)
