| Austria | 29 October 1958 |
| Belgium | 12 December 1958 |
| Bulgaria | 7 January 1970 |
| Cyprus | 25 February 1970 |
| Czechoslovakia | 28 June 1979 |
| Denmark | 27 November 1958 |
| Finland | 1 December 1958 |
| Federal Republic of Germany | 24 November 1958 |
| France | 27 October 1958 |
| Greece | 5 March 1959 |
| Hungary | 25 March 1968 |
| Ireland | 31 October 1958 |
| Israel | 26 March 1959 |
| Italy | 5 February 1959 |
| Netherlands | 10 November 1958 |
| Norway | 23 February 1962 |
| Poland | 17 July 1962 |
| Portugal | 24 March 1960 |
| Romania | 25 June 1980 |
| Spain | 12 April 1966 |
| Sweden | 2 March 1959 |
| Switzerland | 11 March 1968 |
| Turkey | 27 January 1959 |
| United Kingdom | 17 February 1959 |
| Yugoslavia | April 1960 |
