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PRECISION DRAWING INSTRUMENTS AND PARTS THEREOF-NAMELY, DRAWING PENS, BOW PENS, BOW PENCILS, BOW DIVIDERS, SHEATH DIVIDERS, AUTOMATIC HATCHING APPARATUS, PRICKING DEVICES, PROTRACTORS SET SQUARES, BOW COMPASSES, SPRING BOW COMPASSES, COMPASSES WITH WING, ENGRAVER COMPASSES, COMBINATION COMPASSES WITH FIXED NEEDLE POINTS AND WITH DETACHABLE LEGS, BEAM COMPASSES, REDUCING COMPASSES; THEODOLITES, LEVELLING INSTRUMENTS, BINOCULARS, PRISM MAGNIFYING GLASSES, STROBOSCOPES; OBJECTIVE LENSES FOR PHOTOGRAPHIC AND CINEMATOGRAPHIC APPARATUS; POLARIMETERS; AND APPARATUS FOR MICRO-ELECTROPHORESIS FOR USE IN BIOCHEMISTRY, PHYSIOLOGY AND ORGANIC CHEMISTRY