| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 13/04/1954 | |
| FRANCE | Signature | 13/04/1954 | |
| GERMANY | Signature | 13/04/1954 | |
| ITALY | Signature | 13/04/1954 | |
| LUXEMBOURG | Signature | 13/04/1954 | |
| NETHERLANDS THE | Signature | 13/04/1954 | |
| UNITED KINGDOM | Signature | 13/04/1954 |