Holding devices for machine tools, namely, tool holders, and vices and jaws for use in the precision clamping of work pieces; machines and machine tools for material processing and production, in particular electric milling, grooving, cutting, drilling, grinding, sharpening and surface treatment machines and apparatus, namely, drills, lathes, and milling machines for metalworking; structural parts of the aforementioned machines; machine tools and machine inserts for power-operated drills, lat...