Regulation (EEC) No 3092/74 of the Commission of 6 December 1974 re-establishing the levying of customs duties on portland cement, ciment fondu, slag cement, supersulphate cement and similar hydraulic cements, whether or not coloured in the form of clinker, falling within heading No 25.23, originating in developing countries to which the preferential tariff arrangements set out in Council Regulation (EEC) No 3501/73 of 18 December 1973 apply