2849 Carbides, whether or not chemically defined

2849 (01/1988-..) Carbides, whether or not chemically defined 28491000 (01/1988-..) Carbides of calcium, whether or not chemically defined 28492000 (01/1988-..) Carbides of silicon, whether or not chemically defined 28499010 (01/1988-..) Carbides of boron, whether or not chemically defined 28499030 (01/1988-..) Carbides of tungsten, whether or not chemically defined 28499050 (01/1988-..) Carbides of aluminium, of chromium, of molybdenum, of vanadium, of tantalum, and of titanium, whether or not chemically defined 28499090 (01/1988-12/2011) Carbides, whether or not chemically defined (excl. of calcium, silicon, boron, tungsten, aluminium, chromium, molybdenum, vanadium, tantalum and titanium)