| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 14/12/1957 | |
| BELGIUM | Ratification | 16/04/1962 | |
| FRANCE | Signature | 14/12/1957 | |
| GERMANY FEDERAL REPUBLIC | Signature | 14/12/1957 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 10/07/1961 | |
| ITALY | Signature | 14/12/1957 | |
| ITALY | Ratification | 20/09/1966 | |
| LUXEMBOURG | Signature | 14/12/1957 | |
| LUXEMBOURG | Ratification | 13/11/1963 | |
| NETHERLANDS THE | Signature | 14/12/1957 | |
| NETHERLANDS THE | Ratification | 10/02/1963 | |
| UNITED KINGDOM | Signature | 14/12/1957 | |
| UNITED KINGDOM | Ratification | 02/07/1960 | |
| UNITED KINGDOM | Withdrawal | 01/06/2010 | 30/06/2011 |