TECHNICAL ENDOSCOPES-NAMELY, APPARATUS FOR VIEWING INTERNAL PARTS AND SURFACES, INCLUDING PHOTOGRAPHIC AND OPTICAL PARTS AND ACCESSORIES THEREFOR; ENDOSCOPE AND PHOTOGRAPHIC OPTICS; SURVEYING LEVELS AND TRANSITS; NAVIGATIONAL INSTRUMENTS-NAMELY, SEXTANTS AND COMPASSES; PHOTOGRAPHIC AND CINEMATOGRAPHIC CAMERAS, PROJECTORS AND VIEWERS; OPTICAL COMPARATORS; OPTICAL DIMENSION-MEASURING DEVICES; WEIGHING AND CHECKING SCALES; CALCULATING MACHINES; CASH REGISTERS AND COIN COUNTING AND CHANGING MACHINES