| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 28/04/1949 | |
| FRANCE | Signature | 28/04/1949 | |
| GERMANY | Accession | 16/08/1949 | |
| LUXEMBOURG | Signature | 28/04/1949 | |
| LUXEMBOURG | Ratification | 28/04/1949 | |
| NETHERLANDS THE | Signature | 28/04/1949 | |
| UNITED KINGDOM | Signature | 28/04/1949 | |
| UNITED STATES OF AMERICA | Signature | 28/04/1949 |