| Country | Action | Action Date | Effective Date |
|---|
| AUSTRIA | Definitive Signature | 13/12/1957 | 01/01/1958 |
| BELGIUM | Signature | 13/12/1955 | |
| BELGIUM | Ratification | 29/04/1959 | 01/05/1959 |
| CYPRUS | Signature | 02/07/1970 | |
| CYPRUS | Ratification | 08/12/1970 | 01/01/1971 |
| DENMARK | Signature | 13/12/1955 | |
| DENMARK | Ratification | 05/06/1957 | 01/07/1957 |
| FRANCE | Definitive Signature | 13/12/1955 | 01/01/1956 |
| GERMANY FEDERAL REPUBLIC | Definitive Signature | 13/12/1955 | 01/01/1956 |
| GREECE | Signature | 13/12/1955 | |
| GREECE | Ratification | 05/06/1959 | 01/07/1959 |
| ICELAND | Signature | 01/01/1905 | |
| IRELAND, REPUBLIC OF | Definitive Signature | 13/12/1955 | 01/01/1956 |
| ISRAEL | Accession | 19/01/1979 | 01/02/1979 |
| ITALY | Signature | 13/12/1955 | |
| ITALY | Ratification | 17/01/1957 | 01/02/1957 |
| LUXEMBOURG | Signature | 13/12/1955 | |
| LUXEMBOURG | Ratification | 26/03/1958 | 01/04/1958 |
| MALTA | Signature | 24/05/1967 | |
| MALTA | Ratification | 22/09/1967 | 01/10/1967 |
| NETHERLANDS THE | Signature | 13/12/1955 | |
| NETHERLANDS THE | Ratification | 22/10/1958 | 01/11/1958 |
| NORWAY | Definitive Signature | 21/09/1956 | 01/10/1956 |
| PORTUGAL | Signature | 20/11/1979 | |
| SAAR TERRITORY | Signature | 13/12/1955 | |
| SWEDEN | Definitive Signature | 03/03/1956 | 01/04/1956 |
| TURKEY | Signature | 13/12/1955 | |
| TURKEY | Ratification | 07/10/1959 | 01/11/1959 |
| UNITED KINGDOM | Signature | 13/12/1955 | |
| UNITED KINGDOM | Ratification | 13/07/1956 | |
| UNITED KINGDOM | Ratification | 13/07/1956 | 01/08/1956 |