[ Lens shutters; ] optical lenses; [ optical lens sights; ] biological microscopes; [ electron microscopes; ] metallurgical microscopes; [ microscope condensers; microscope illuminating devices; ] microscopes; [ operating microscope stands; ] polarizing microscopes; [ reflectors for microscopes; optical reflectors; optical shutters; optical filters; ] scientific and technical apparatus, namely, microscopes, [ optical mirrors and ] optical lenses; [ optical or telescopic lens sights; optical s...