… doped for use in electronics, in the form of discs, wafers or similar forms; chemical compounds doped for use in …
Explanatory notes
… doped for use in electronics, in the form of discs, wafers or similar forms; chemical compounds doped for use in … part per million, provided they are in the form of discs, wafers or similar forms. When in forms unworked as drawn, or … (e.g., germanium, iodine) generally in a proportion of a few per cent, with a view to their use in electronics, …