6999: Semi-manufactures of tungsten, molybdenum etc.

69991: Tungsten, wrought.& art.of tungsten 69992: Molybdenum, wrought & art.of molybdenum 69993: Tantalum, wrought & art.of tantalum 69994: Wrought bars, rods, angles, shapes of magnesium 69995: Beryllium, wrought & art.of beryllium 69999: Base metals, n.e.s. wrought & art. of such metals 6999: Semi-manufactures of tungsten, molybdenum etc.