| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| ANTIGUA AND BARBUDA | Succession | 14/12/1988 | 01/11/1989 |
| AUSTRIA | Accession | 21/07/1950 | |
| DENMARK | Accession | 05/04/1950 | |
| GUATEMALA | Accession | 30/06/1951 | |
| IRAN | Accession | 16/05/1974 | |
| LUXEMBOURG | Accession | 20/09/1950 | |
| NETHERLANDS THE | Accession | 21/07/1949 | |
| NIGERIA | Accession | 26/06/1961 | |
| NORWAY | Accession | 25/01/1950 | |
| UNITED KINGDOM | Ratification | 16/08/1949 | |
| UNITED KINGDOM | Accession | 16/08/1949 |