23 ROLLER BEARINGS; ROLLER BEARINGS AND HOUSINGS THEREFOR; WHEEL SETS; WHEEL SETS WITH HOUSINGS AND BEARINGS; BALL BEARINGS; AXLES, DRIVING GEAR, AND HUBS EQUIPPED WITH BEARINGS FOR LAND, SEA AND AIR VEHICLES, SUCH AS RAILWAYS, TRAMWAYS, PASSENGER CARS AND TRUCKS; AND AXLE BOXES