| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 09/05/1949 | |
| DENMARK | Signature | 09/05/1949 | |
| DENMARK | Accession | 25/01/1950 | |
| ECUADOR | Accession | 07/07/1953 | |
| FINLAND | Accession | 31/07/1958 | |
| FRANCE | Signature | 09/05/1949 | |
| GERMANY FEDERAL REPUBLIC | Accession | 10/10/1957 | |
| GHANA | Accession | 09/09/1958 | |
| GREECE | Signature | 09/05/1949 | |
| GUATEMALA | Accession | 30/06/1951 | |
| HAITI | Accession | 16/04/1952 | |
| INDIA | Accession | 19/10/1949 | |
| ITALY | Signature | 09/05/1949 | |
| NETHERLANDS THE | Signature | 09/05/1949 | |
| SWEDEN | Signature | 09/05/1949 | |
| TURKEY | Signature | 09/05/1949 | |
| UNITED KINGDOM | Signature | 09/05/1949 | |
| UNITED STATES OF AMERICA | Signature | 09/05/1949 | |