| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 25/11/1957 | |
| BELGIUM | Ratification | 27/02/1958 | |
| BELGIUM | Ratification | 18/04/1958 | |
| EUROPEAN COAL AND STEEL COMMUNITY | Signature | 25/11/1957 | |
| FRANCE | Signature | 25/11/1957 | |
| FRANCE | Ratification | 24/06/1958 | |
| GERMANY FEDERAL REPUBLIC | Signature | 25/11/1957 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 23/05/1958 | |
| ITALY | Signature | 25/11/1957 | |
| ITALY | Ratification | 28/02/1958 | |
| LUXEMBOURG | Signature | 25/11/1957 | |
| LUXEMBOURG | Ratification | 18/04/1958 | |
| NETHERLANDS THE | Signature | 25/11/1957 | |
| NETHERLANDS THE | Ratification | 22/10/1958 | |
| UNITED KINGDOM | Signature | 25/11/1957 | |
| UNITED KINGDOM | Ratification | 18/03/1958 |