| Country | Action | Action Date | Effective Date |
|---|
| AUSTRIA | Signature | 28/07/1960 | |
| AUSTRIA | Ratification | 22/03/1961 | |
| DENMARK | Signature | 28/07/1960 | |
| DENMARK | Ratification | 24/09/1960 | |
| FINLAND | Accession | 01/04/1963 | |
| HUNGARY | Accession | 10/11/1994 | 10/02/1995 |
| ICELAND | Accession | 19/05/1970 | |
| NORWAY | Signature | 28/07/1960 | |
| NORWAY | Ratification | 29/11/1960 | |
| PORTUGAL | Signature | 28/07/1960 | |
| PORTUGAL | Ratification | 26/04/1976 | |
| SWEDEN | Signature | 28/07/1960 | |
| SWEDEN | Ratification | 02/06/1961 | |
| SWITZERLAND | Signature | 28/07/1960 | |
| SWITZERLAND | Reservation | 28/07/1960 | |
| UNITED KINGDOM | Signature | 28/07/1960 | |
| UNITED KINGDOM | Ratification | 26/06/1961 | |