Scientific, surveying, photographic, optical, and measuring apparatus and instruments, namely, gas testing instruments, apertometers, thermionic lamps and tubes, lasers, not for medical purposes, spectroscopes, plane tables for surveying, exposure meters for photographic devices flash bulbs, photography darkroom lamps, photometers, fiber optic cables, optical lanterns, optical lenses, luminous pointers, electronic heliographic apparatus for recording the duration and intensity of sunshine, mi...