Article 31

Member States shall refrain from introducing between themselves any new quantitative restrictions or measures having equivalent effect.

This obligation shall, however, relate only to the degree of liberalization attained in pursuance of the decisions of the Council of the Organization for European Economic Cooperation of 14 January 1955. Member States shall supply the Commission, not later than six months after the entry into force of this Treaty, with lists of the products liberalized by them in pursuance of these decisions. These lists shall be consolidated between Member States.