7 PARTS AND FITTINGS FOR INDUSTRIAL MACHINES, MACHINE TOOLS AND ELECTRIC MOTORS, INTERNAL COMBUSTION ENGINES AND TURBINES FOR MACHINES, NAMELY-PROTECTIVE TUBES AND PIPES, PROTECTIVE SLEEVES AND COVERS, BEARINGS, MORTARS AS PARTS OF CRUSHING AND GRINDING MACHINES, CRUCIBLES AS PARTS OF METAL-MAKING AND METAL-WORKING MACHINES, IMPELLERS AND RUNNERS, AND VALVE SEATS; IMPELLERS AND RUNNERS FOR SUPER CHARGERS AND TURBINES