Binoculars; Microscopes; Periscopes; Telemeters; Telescopes; Distance measuring apparatus; Height measuring instruments; Magnifying glasses; Optical apparatus and instruments, namely, optical ports for underwater photography, dome ports for underwater photography, wet diopters, adapter lenses for underwater photography; Optical frames; Optical lenses; Precision balances; Sighting telescopes for firearms; Surveying apparatus; Surveyors' levels; Telescopic sights for artillery; Protective eye p...