| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 10/10/1957 | |
| BELGIUM | Ratification | 31/07/1975 | |
| BRAZIL | Signature | 10/10/1957 | |
| DENMARK | Signature | 06/09/1963 | |
| DENMARK | Ratification | 16/12/1963 | |
| FINLAND | Signature | 24/11/1965 | |
| FINLAND | Ratification | 02/02/1966 | |
| FRANCE | Signature | 10/10/1957 | |
| GERMANY FEDERAL REPUBLIC | Signature | 10/10/1957 | |
| GREECE | Signature | 10/10/1957 | |
| INDIA | Signature | 10/10/1957 | |
| IRAN | Signature | 12/10/1959 | |
| ISRAEL | Signature | 10/10/1957 | |
| ITALY | Signature | 10/10/1957 | |
| ITALY | Ratification | 24/05/1963 | |
| LUXEMBOURG | Accession | 18/02/1991 | |
| MALAGASY REPUBLIC | Accession | 13/07/1965 | |
| MOROCCO | Accession | 22/01/1959 | |
| NORWAY | Signature | 30/01/1961 | |
| NORWAY | Ratification | 24/05/1962 | |
| PERU | Signature | 10/10/1957 | |
| PERU | Ratification | 23/11/1961 | |
| PORTUGAL | Signature | 10/10/1957 | |
| SPAIN | Signature | 10/10/1957 | |
| SWEDEN | Signature | 21/12/1961 | |
| SWEDEN | Ratification | 27/06/1962 | |
| SWITZERLAND | Signature | 10/10/1957 | |
| SYRIA | Accession | 15/04/2003 | |
| UNITED KINGDOM | | | |
| VATICAN CITY | Signature | 10/10/1957 | |