Case 7/85: Reference for a preliminary ruling by the Tribunal de Grande Instance, La Roche-sur-Yon, by judgment of that court of 19 November 1984 in the case of Procureur de la Republique and Directeur Departemental de la Concurrence et de la Consommation v. Henri Vincendeau; defendant for the purposes of civil liability: Shedis Avenue SA