Supplementary Protocol between the European Community and the European Coal and Steel Community, of the one part, and the Slovak Republic, of the other part, to the Interim Agreement on trade and trade-related matters between the European Economic Community and the European Coal and Steel Community, of the one part, and the Czech and Slovak Federal Republic, of the other part - Protocol 4 concerning the definition of the concept of 'originating products` and methods of administrative cooperation - Protocol 8 concerning transit and land transport infrastructure