| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 25/03/1957 | |
| FRANCE | Signature | 25/03/1957 | |
| FRANCE | Declaration | 25/03/1957 | |
| GERMANY FEDERAL REPUBLIC | Signature | 25/03/1957 | |
| GERMANY FEDERAL REPUBLIC | Declaration | 25/03/1957 | |
| ITALY | Signature | 25/03/1957 | |
| LUXEMBOURG | Signature | 25/03/1957 | |
| NETHERLANDS THE | Signature | 25/03/1957 | |
| UNITED KINGDOM |