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