SPECTACLE FRAMES AND MOUNTINGS, SPECTACLE LENSES, OBJECTIVE LENSES FOR PROJECTORS, BINOCULARS AND FIELD GLASSES, MAGNIFYING LENSES AND READING GLASSES, APPARATUS FOR PROJECTING IMAGES OF CONTOURS OF OBJECTS FOR CHECKING, INSPECTION, OR MEASUREMENT, COMBINED RULER AND MAGNIFYING GLASS, SUN GLASSES, MICROSCOPES AND PARTS THEREOF, PHOTOMICROGRAPHIC APPARATUS, SPECTROPHOTOMETERS, SPECTROMETERS, SPECTROGRAPHS, DENSITOMETERS, SACCHARIMETERS, POLARISCOPES, MONOCHROMATORS, PHOTOMETERS, COLORIMETERS, APPARATUS FOR MEASURING OPACITY OF PAPER, DUST COUNTERS EMBODYING MICROSCOPES AND USED TO DETERMINE THE DUST CONTENT OF AIR,HAEMACYTOMETERS; REFRACTOMETERS, APPARATUS FOR PROJECTING IMAGES OF OPAQUE AND/OR TRANSPARENT OBJECTS, TELESCOPES, PERIMETERS, OPHTHALMOSCOPES, KERATOMETERS USED FOR MEASURING CORNEAL CURVATURE, TANGENT SCREENS FOR PLOTTING VISION FIELDS OF THE EYE, RETINOSCOPES, APPARATUS FOR TESTING VISUAL ACUITY, APPARATUS FOR EXERCISING AND TRAINING THE EYES, OPHTHALMIC TRIAL FRAMES, INTERPUPILLARY DISTANCE GAUGES, OPHTHALMIC SLIT LAMPS, SEXTANTS, PROJECTORS AND ACCESSORIES FOR AERIAL MAPPING EQUIPMENT, PHOTOGRAPHIC OBJECTIVE LENSES, LENS TESTING AND MEASURING APPARATUS, ILLUMINATED VIEWING BOXES FOR TRANSPARENT SLIDES AND FILMS, REFLECTORS FOR STILL AND MOTION PICTURE PROJECTORS, TOOLMAKERS' MICROSCOPES, OPTICAL PROTRACTORS, METALLOGRAPHIC APPARATUS FOR EXAMINING METALLIC SPECIMENS, OPHTHALMIC INSTRUMENT STANDS, CONDENSING LENSES, GOGGLES, LIGHT FILTERS, MIRRORS FOR LABORATORY AND SCIENTIFIC USE, PRISMS, LENS CALIPERS, AND SPECTACLE FRAME GAUGES