INSTALLATIONS FOR LIGHTING, HEATING, STEAM GENERATING, COOKING, REFRIGERATING, DRYING, VENTILATING, WATER SUPPLY AND SANITARY PURPOSES, ESPECIALLY INSTALLATIONSFOR TREATMENT OF ORES, SHAFT FURNACES, MELTING FURNACES, HEATING DEVICES, BURNERS, PARTICULARLY PLASMAGENERATORS, CONVERTERS, REFRIGERATING COMPONENTS, CONVERTERS, REACTORS, MIXING CHAMBERS AND COMBUSTION CHAMBERS