Explanatory notes
… they are in the form of discs, wafers or similar forms. When in forms unworked as drawn, or in the form of cylinders … of a few per cent, with a view to their use in electronics, whether in the form of cylinders, rods, etc., or cut into … forms. The heading covers such crystals, polished or not, whether or not coated with a uniform epitaxial layer. Those …