Cameras; Microphones; Webcams; Audio receivers; Conference phones; Touch screens; TV monitors; Video cameras; Video transmission apparatus; Wireless transmitters and receivers

Astronomical spectrographs; Binoculars; Lenses for microscopes; Magnifying glasses; Microscope objectives; Microscopes; Optical condensers; Optical lenses; Periscopes; Photometers; Spectrograph apparatus; Stereoscopes; Telemeters; Telescopes; Telescopic sights for artillery; Educational apparatus, namely, manipulative blocks used as teaching aids for the visualization of math concepts; Inspection mirrors; Optical inspection apparatus; Protective eye pieces; Safety goggles; Surveying machines ...