Commission Regulation (EEC) No 1933/80 of 18 July 1980 re-establishing the levying of customs duties on nails, tacks, staples, hook-nails, corrugated nails, spiked cramps, etc., falling within heading No 73.31 and originating in Romania, to which the preferential tariff arrangements set out in Council Regulation (EEC) No 2789/79 apply