| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 28/05/1952 | |
| CANADA | Signature | 19/06/1952 | |
| DENMARK | Signature | 19/06/1952 | |
| DENMARK | Statement | 19/06/1952 | |
| FRANCE | Signature | 19/06/1952 | |
| IRELAND, REPUBLIC OF | Signature | 28/05/1952 | |
| NETHERLANDS THE | Signature | 28/05/1952 | |
| NORWAY | Signature | 28/05/1952 | |
| PORTUGAL | Signature | 28/05/1952 | |
| SWEDEN | Signature | 28/05/1952 | |
| UNITED KINGDOM | Signature | 28/05/1952 | |
| UNITED STATES OF AMERICA | Signature | 28/05/1952 |