| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 03/02/1949 | |
| CANADA | Signature | 03/02/1949 | |
| CUBA | Accession | 24/10/1951 | |
| DENMARK | Signature | 25/03/1949 | |
| HAITI | Signature | 24/10/1951 | |
| HONDURAS | Signature | 06/10/1951 | |
| LUXEMBOURG | Signature | 25/11/1949 | |
| NETHERLANDS THE | Signature | 03/02/1949 | |
| NICARAGUA | Signature | 23/10/1951 | |
| UNITED KINGDOM | |||
| UNITED STATES OF AMERICA | Signature | 03/02/1949 |