antifriction bearings and plain bearings; bearings for linear motions; namely, recirculating ball sleeve-type linear bearings, rail guides, recirculating roller and flat-way type bearings; rolling friction drive assemblies; namely, ball screw drives, planetary roller drives, worm roller drives; ball transfer units; roller bearing rollers; antifriction bearing balls, bearing sleeves and bearing housings as well as cages for antifriction bearing rolling members; shaft supports; shaft support rails and shaft support blocks; tables and carriages for feeding work pieces to work piece machinery or processing machines as well as for their further conveyance; mechanical pick-and-place units and linear motion modules used with machine tools and assembly devices for gripping, holding, depositing, turning, sliding, and removing work pieces; pneumatically, hydraulically, mechanically and/or electrically driven actuators for machine tools and for work piece feeding machines; plastic parts for the machine industry; namely, bearings; plastic parts for the electrical and electronic industry; namely, plastic plain bearings