1 . CUSTOMS DUTIES ON EXPORTS - CHARGES HAVING EQUIVALENT EFFECT - CONCEPT - CHARGE FOR THE CONTROL OF ARTICLES OF PRECIOUS METAL - CLASSIFICATION ( EEC TREATY , ART . 16 ) 2 . TAX PROVISIONS - INTERNAL TAXATION - PRODUCTS INTENDED FOR EXPORT - RULE AGAINST DISCRIMINATION - APPLICATION ( EEC TREATY , ART . 95 ) 3 . TAX PROVISIONS - INTERNAL TAXATION - PRODUCTS PLACED ON THE MARKET IN SEVERAL MEMBER STATES - DOUBLE TAXATION - EFFECTS - ABOLITION - HARMONIZATION OF LEGISLATION ( EEC TREATY , ARTS . 95 , 99 AND 100 )