| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 11/05/1955 | |
| BELGIUM | Declaration | 11/05/1955 | |
| BELGIUM | Ratification | 19/07/1956 | |
| BELGIUM | Denunciation | 30/06/2010 | 30/06/2011 |
| FRANCE | Signature | 11/05/1955 | |
| FRANCE | Ratification | 25/08/1958 | |
| GERMANY FEDERAL REPUBLIC | Signature | 11/05/1955 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 22/09/1959 | |
| GREECE | Ratification | 06/03/1995 | |
| GREECE | Denunciation | 30/06/2010 | 30/06/2011 |
| ITALY | Signature | 11/05/1955 | |
| ITALY | Declaration | 11/05/1955 | |
| ITALY | Ratification | 14/05/1958 | |
| ITALY | Denunciation | 30/06/2010 | 30/06/2011 |
| LUXEMBOURG | Signature | 11/05/1955 | |
| LUXEMBOURG | Declaration | 11/05/1955 | |
| LUXEMBOURG | Ratification | 03/03/1961 | |
| NETHERLANDS THE | Signature | 11/05/1955 | |
| NETHERLANDS THE | Declaration | 11/05/1955 | |
| NETHERLANDS THE | Ratification | 02/02/1956 | |
| PORTUGAL | Accession | 27/03/1990 | |
| PORTUGAL | Denunciation | 22/07/2010 | 22/07/2011 |
| SPAIN | Denunciation | 18/10/2010 | 18/10/2010 |
| UNITED KINGDOM | Signature | 11/05/1955 | |
| UNITED KINGDOM | Ratification | 06/09/1955 | |
| UNITED KINGDOM | Withdrawal | 01/06/2010 | 30/06/2011 |