14 REFRACTORY METAL POWDERS-NAMELY, TUNGSTEN, TUNGSTEN CARBIDE, TUNGSTEN-COPPER, MOLYBDENUM AND HEAVY METALS; METAL ALLOY POWDERS-NAMELY, STAINLESS STEEL, TOOL STEEL, SUPER ALLOYS, BRAZING AND HARDFACING ALLOYS, [ NICKEL-SILVER, MONEL, ] NICKEL, COBALT AND IRON BASED ALLOYS AND MASTER ALLOYS; TANTALUM POWDER AND COBALT POWDER