Changes made by Regulation (EEC) No 3267/73 of the Council of 3 December 1973 extending the period of validity of Regulation (EEC) No 2716/72 laying down general rules for measures to increase the use of butter by certain classes of consumers: Regulation (EEC) No 2716/72 of the Council of 19 December 1972 laying down general rules for measures to increase the use of butter by certain classes of consumers