UMBRAL

[ LENSES, EYE-GLASSES, MAGNIFYING GLASSES, READING GLASSES, SPECTACLES; ] SPECTACLE GLASSES [ MAGNIFYING LENS SPECTACLE; SCIENTIFIC INSTRUMENTS-NAMELY, MICROSCOPES, MICROSCOPE OBJECTIVES, MICROSCOPE CONDENSERS, MICROSCOPE LAMPS, REFRACTOMETERS, PHOTOMETERS, SPECTROMETERS, COLORIMETERS, OPHTHALMOMETERS, SLIT LAMPS, PERIMETERS, PHOTOGRAPHIC CAMERAS, PROJECTORS AND ENLARGERS, AIR PHOTOGRAPHIC APPARATUS, APPARATUS FOR PLOTTING FROM AIR-PHOTOGRAPHS, AND VIEW FINDERS FOR SURGICAL PURPOSES ]