| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 25/03/1957 | |
| BELGIUM | Ratification | 13/12/1957 | |
| FRANCE | Signature | 25/03/1957 | |
| FRANCE | Ratification | 25/11/1957 | |
| GERMANY FEDERAL REPUBLIC | Signature | 25/03/1957 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 09/12/1957 | |
| ITALY | Signature | 25/03/1957 | |
| ITALY | Ratification | 23/11/1957 | |
| LUXEMBOURG | Signature | 25/03/1957 | |
| LUXEMBOURG | Ratification | 13/12/1957 | |
| NETHERLANDS THE | Signature | 25/03/1957 | |
| NETHERLANDS THE | Ratification | 13/12/1957 |