1 . COMMON CUSTOMS TARIFF - ALTERATION OR SUSPENSION OF IMPORT DUTIES - DESCRIPTIONS OF THE PRODUCTS CONCERNED - INTERPRETATION - CRITERIA - ' YARN WHOLLY OF POLYGLYCOLLIC ACID ' - YARN CONTAINING ANOTHER SUBSTANCE - EXCLUDED ( EEC TREATY , ART . 28 ; COUNCIL REGULATIONS NOS 1162/79 AND 1481/80 ) 2 . COMMON CUSTOMS TARIFF - ALTERATION OR SUSPENSION OF IMPORT DUTIES - DISCRETION OF THE COUNCIL - CONSIDERATION OF THE ESTABLISHED NEEDS OF THE COMMUNITY INDUSTRY ( EEC TREATY , ART . 28 ; COUNCIL REGULATIONS NOS 1162/79 AND 1481/80 )