7 MACHINES, NAMELY, MILLS, VERTICAL ROLLER GRINDING MILLS, ROLLING MILLS, AUTOGENOUS AND SEMI-AUTOGENOUS MILLS FOR USE IN GRINDING CEMENT, RAW MATERIALS, CLINKER, LIMESTONE, DOLOMITE, QUICKLIME, HYDRATED LIME GYPSUM, MAGNESITE, PHOSPHATE FELDSPAR, TALCUM CLAY, KAOLIN, BENTONITE, BARITE, GRAPHITE, COLEMANITE, TARTINIUM DIOXIDE, MANGANESE DIOXIDE, COKE, PETROLEUM COKE, ANTHRACITE, ELECTRODE MATERIALS, HARD COAL AND HARD BROWN COAL; MATERIAL CONVEYORS; AND MATERIAL PROPORTIONERS AS FEEDERS FOR RAW MATERIAL, OVERSIZE FRACTION AND COARSE MEAL OR FOR EXHAUSTION OF THE OVERSIZE FRACTION; MATERIAL LOCKS, NAMELY, STAR WHEELS, FEEDERS, NAMELY, ROTARY FEEDERS AND FLAP GATES USED AS PROPORTIONERS AND/OR AIRLOCKS FOR FEEDING RAW MATERIAL INTO AIRSWEPT MILLS, WHICH ARE OPERATED UNDER A DIFFERENT AIR/GAS PRESSURE IN RELATION TO THE ATMOSPHERIC PRESSURE, AND PROCESS ENGINEERING PLANTS FORMED THEREFROM FOR THE RAW MATERIAL INDUSTRY, CEMENT WORKS, POWER STATIONS, STEEL WORKS, THE CHEMICAL INDUSTRY, ENVIRONMENTAL TECHNOLOGY AND THE CONDITIONING OF WASTE