| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| AUSTRIA | Accession | 10/11/1959 | |
| BELGIUM | Signature | 01/07/1953 | |
| BELGIUM | Ratification | 19/07/1954 | |
| BULGARIA | Accession | 11/06/1999 | 11/06/1999 |
| CZECH AND SLOVAK FEDERAL REPUBLIC | Accession | 20/12/1991 | 20/12/1991 |
| CZECH REPUBLIC | Accession | 30/07/1993 | 30/07/1993 |
| DENMARK | Signature | 23/12/1953 | |
| DENMARK | Ratification | 05/04/1954 | |
| FINLAND | Accession | 28/12/1990 | 28/12/1990 |
| FRANCE | Signature | 01/07/1953 | |
| FRANCE | Ratification | 29/09/1954 | |
| GERMANY FEDERAL REPUBLIC | Signature | 01/07/1953 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 29/09/1954 | |
| GREECE | Signature | 01/07/1953 | |
| GREECE | Ratification | 07/07/1954 | |
| HUNGARY | Accession | 29/06/1991 | 29/06/1991 |
| ITALY | Signature | 01/07/1953 | |
| ITALY | Ratification | 24/02/1955 | |
| NETHERLANDS THE | Signature | 01/07/1953 | |
| NETHERLANDS THE | Ratification | 15/06/1954 | |
| NORWAY | Signature | 31/12/1953 | |
| NORWAY | Ratification | 04/10/1954 | |
| POLAND | Accession | 06/06/1991 | 06/06/1991 |
| PORTUGAL | Accession | 21/11/1985 | 21/11/1985 |
| SLOVAK REPUBLIC | Accession | 02/08/1993 | 02/08/1993 |
| SPAIN | Accession | 06/06/1962 | |
| SPAIN | Withdrawal | 31/12/1968 | |
| SPAIN | Re-Accession | 15/11/1983 | |
| SWEDEN | Signature | 01/07/1953 | |
| SWEDEN | Ratification | 15/07/1954 | |
| SWITZERLAND | Signature | 17/07/1953 | |
| SWITZERLAND | Ratification | 12/02/1954 | |
| UNITED KINGDOM | Signature | 01/07/1953 | |
| UNITED KINGDOM | Ratification | 30/12/1953 | |
| YUGOSLAVIA | Signature | 01/07/1953 | |
| YUGOSLAVIA | Ratification | 09/02/1955 | |
| YUGOSLAVIA | Withdrawal | 31/12/1961 |