| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 21/12/1954 | |
| BELGIUM | Ratification | 28/07/1955 | |
| EUROPEAN COAL AND STEEL COMMUNITY | Signature | 21/12/1954 | |
| FRANCE | Signature | 21/12/1954 | |
| FRANCE | Ratification | 19/08/1955 | |
| GERMANY FEDERAL REPUBLIC | Signature | 21/12/1954 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 23/09/1955 | |
| ITALY | Signature | 21/12/1954 | |
| ITALY | Ratification | 09/09/1955 | |
| LUXEMBOURG | Signature | 21/12/1954 | |
| LUXEMBOURG | Ratification | 23/08/1955 | |
| NETHERLANDS THE | Signature | 21/12/1954 | |
| NETHERLANDS THE | Ratification | 29/08/1955 | |
| UNITED KINGDOM | Signature | 21/12/1954 | |
| UNITED KINGDOM | Ratification | 17/06/1955 |