GROPPERA RADIO AG AND OTHERS v. SWITZERLAND JUDGMENT 10 (iii) an order (no. 509/82) referring the case to the Constitutional Court as sections 1, 2 and 45 of the 1975 Law appeared to raise a constitutional issue - and staying the proceedings. 32. The Constitutional Court gave its decision on 6 May 1987 in a judgment (no. 153/1987) which was filed at the registry on 13 May. It declared section 2(1) of the impugned Law to be unconstitutional as it did not make any provision for the possibility of broadcasting programmes abroad under licences issued to private companies by the State authorities. II. SWITZERLAND TELECOMMUNICATIONS LAW AND INTERNATIONAL A. The International Telecommunication Convention 33. The International Telecommunication Convention, which was concluded in the International Telecommunication Union on 25 October 1973 and revised on 6 November 1982, has been ratified by all the Council of Europe’s member States. In Switzerland it has been published in full in the Official Collection of Federal Statutes (1976, p. 994, and 1985, p. 1093), and in the Compendium of Federal Law (0.784.16). Article 33, entitled "Rational Use of the Radio Frequency Spectrum", provides: "Members shall endeavour to limit the number of frequencies and the spectrum space used to the minimum essential to provide in a satisfactory manner the necessary services. To that end they shall endeavour to apply the latest technical advances as soon as possible." Article 35 § 1 reads: "All stations, whatever their purpose, must be established and operated in such a manner as not to cause harmful interference to the radio services or communications of other Members or of recognised private operating agencies, or of other duly authorised operating agencies which carry on radio service, and which operate in accordance with the provisions of the Radio Regulations." 34. The Convention is supplemented and clarified by three sets of administrative rules: the Radio Regulations, the Telegraph Regulations and the Telephone Regulations. Only the first of these is relevant in the instant case. B. The Radio Regulations 35. The Radio Regulations date from 21 December 1959 and were likewise amended in 1982 and also on other occasions. They run to over a thousand pages and - except for numbers 422 and 725 - have not been