Opinion of Mr Advocate General Lenz delivered on 19 September 1991

1 Original language: German.

2 Case C-57/90 Commission v France [1992] ECR I-75.

3 Case 275/83 Commission v Belgium [1985] ECR 1097.

4 Regulation (EEC) No 1408/71 of the Council of 14 June 1971, consolidated version in OJ 1983 L 230, p. 1.