Changes to Commission Regulation (EEC) No 3751/83 of 23 December 1983 derogating in respect of the countries of the Central American Common Market from Articles 1, 7 and 13 of Regulation (EEC) No 3749/83 on the definition of the concept of originating products for purposes of the application of tariff preferences granted by the European Economic Community in respect of certain products from developing countries: Commission Regulation (EEC) No 3607/84 of 19 December 1984 extending the period of application of Regulations (EEC) No 3750/83, (EEC) No 3751/83 and (EEC) No 3752/83 derogating in respect of the countries of the Association of South-East Asian Nations, the countries of the Central American common market and the countries which have signed the Cartagena Agreement (Andean Group), from Regulation (EEC) No 3749/83