| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| FRANCE | Signature | 26/05/1952 | |
| FRANCE | Ratification | 05/05/1955 | |
| GERMANY FEDERAL REPUBLIC | Signature | 26/05/1952 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 30/03/1954 | |
| UNITED KINGDOM | Signature | 26/05/1952 | |
| UNITED KINGDOM | Ratification | 05/05/1955 | |
| UNITED STATES OF AMERICA | Signature | 26/05/1952 | |
| UNITED STATES OF AMERICA | Ratification | 20/04/1955 |