JUDGMENT OF THE COURT of 30 April 1996 in Case C-194/94 (reference for a preliminary ruling from the Tribunal de Commerce de Liège): CIA Security International SA v. Signalson SA and Securitel SPRL (Interpretation of Article 30 of the EC Treaty and of Directive 83/189/EEC laying down a procedure for the provision of information in the field of technical standards and regulations - National legislation on the marketing of alarm systems and networks - Prior administrative approval)