11 FURNACES FOR MELTING, PURIFYING, REFINING AND REPROCESSING METALS; VACUUM FURNACES; ELECTRIC ARC FURNACES; INDUCTION FURNACES; ELECTRON BEAM FURNACES; ELECTROSLAG MELTING AND REMELTING FURNACES; [ NUCLEAR PHYSICS AND NUCLEAR ENGINEERING UNITS ]; CRYSTAL GROWING AND ZONE MELTING/REFINING PLANTS; UNITS FOR DRYING, FREEZE [ DRYING, DEGASSING, DECANTING, IMPREGNATING, MIXING, SINTERING, HOT PRESSING, ISOTHERMALLY FORGING, CASTING, DISTILLING, HEAT TREATING, MELTING, SPUTTERING, ATOMIZING ], EVAPORATING, VAPOR-DEPOSITING OR COATING OF MATERIALS UNDER VACUUM; [ UNITS FOR HEAT TREATING METALS IN A VACUUM ]; CRYOGENIC UNITS; GAS PURIFIERS AND GAS RECOVERY UNITS