7 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; GEAR WHEELS; TOLERANCE RINGS; TABLES AND CARRIAGES FOR FEEDING WORK PIECES TO WORK PIECE MACHINING 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, GEARS, BEARINGS, AND KNOBS AND GRIPS FOR SHIFTING LINKAGES AND SHIFTING LEVERS; PLASTIC PARTS FOR THE ELECTRICAL AND ELECTRONIC INDUSTRY, NAMELY, PLASTIC PLAIN BEARINGS AND GEAR WHEELS