| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Undertaking | 21/04/1959 | |
| BELGIUM | Accession | 27/08/1962 | |
| FRANCE | Signature | 03/04/1958 | |
| FRANCE | Ratification | 03/06/1959 | |
| GREECE | Signature | 01/08/1958 | |
| GREECE | Undertaking | 23/04/1959 | |
| GREECE | Ratification | 05/10/1960 | |
| ISRAEL | Accession | 10/09/1958 | |
| ITALY | Undertaking | 22/05/1959 | |
| LIBYA | Accession | 02/09/1959 | |
| MOROCCO | Accession | 11/08/1958 | |
| PORTUGAL | Signature | 08/04/1958 | |
| PORTUGAL | Ratification | 09/06/1959 | |
| SPAIN | Signature | 09/04/1958 | |
| SPAIN | Undertaking | 26/06/1959 | |
| SPAIN | Ratification | 29/09/1959 | |
| TUNISIA | Signature | 03/04/1958 | |
| TUNISIA | Undertaking | 12/05/1959 | |
| TUNISIA | Ratification | 18/03/1960 | |
| UNITED KINGDOM | Signature | 31/07/1958 | |
| UNITED KINGDOM | Ratification | 19/06/1959 | |