Mechanical components for valve control in internal combustion piston engines, namely, pump control valves, servo-valves; machine components, namely, thread guide rollers, guide bars and shafts with tracks and for rolling bearings; machine parts, namely, plain spherical bearings, sliding bearings, levers for textile machines, universal joints, stud-type track rollers, bearings for slewing motion, bearings for longitudinal motion, bearing bushings, bearing housings, housings for rolling bearin...