| Country | Action | Action Date | Effective Date |
|---|
| AUSTRALIA | Accession | 10/08/1961 | |
| AUSTRIA | Signature | 15/05/1955 | |
| AUSTRIA | Ratification | 14/06/1955 | |
| BRAZIL | Accession | 15/09/1958 | |
| CANADA | Accession | 23/06/1959 | |
| CZECHOSLOVAKIA | Accession | 28/09/1955 | |
| FRANCE | Signature | 15/05/1955 | |
| FRANCE | Ratification | 27/07/1955 | |
| MEXICO | Accession | 28/12/1956 | |
| NEW ZEALAND | Accession | 26/09/1959 | |
| POLAND | Accession | 20/08/1956 | |
| SOVIET UNION | Signature | 15/05/1955 | |
| SOVIET UNION | Ratification | 05/07/1955 | |
| UNITED KINGDOM | Signature | 15/05/1955 | |
| UNITED KINGDOM | Ratification | 19/07/1955 | |
| UNITED STATES OF AMERICA | Signature | 15/05/1955 | |
| UNITED STATES OF AMERICA | Ratification | 09/07/1955 | |
| YUGOSLAVIA | Accession | 28/11/1955 | |