Commission Regulation (EEC) No 2977/78 of 15 December 1978 re-establishing the levying of customs duties on illuminating glassware, signalling glassware and optical elements of glass, not optically worked or of optical glass, falling within subheading 70.14 B and originating Yugoslavia, to which the preferential tariff arrangements set out in Council Regulation (EEC) No 2705/77 apply