Explanatory notes
… lead : 2620.21 - - Leaded gasoline sludges and leaded anti-knock compound sludges 2620.29 - - Other 2620.30 - … mercury, thallium or their mixtures, of a kind used for the extraction of arsenic or those metals or for the manufacture … and slag or dross, for example those rich in copper, zinc, tin, lead, etc. (2) Hard zinc spelter, residue from …