| Country | Action | Action Date | Effective Date |
|---|
| AUSTRIA | Signature | 11/05/1959 | |
| AUSTRIA | Ratification | 02/12/1959 | |
| BELGIUM | Signature | 11/05/1959 | |
| BELGIUM | Ratification | 08/07/1960 | |
| DENMARK | Signature | 11/05/1959 | |
| DENMARK | Ratification | 06/10/1959 | |
| FRANCE | Signature | 11/05/1959 | |
| FRANCE | Ratification | 10/08/1959 | |
| GERMANY FEDERAL REPUBLIC | Signature | 11/05/1959 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 21/04/1960 | |
| ITALY | Signature | 11/05/1959 | |
| ITALY | Ratification | 11/04/1960 | |
| LUXEMBOURG | Signature | 11/05/1959 | |
| LUXEMBOURG | Ratification | 16/08/1961 | |
| NETHERLANDS THE | Signature | 11/05/1959 | |
| NETHERLANDS THE | Ratification | 26/11/1959 | |
| NORWAY | Signature | 11/05/1959 | |
| NORWAY | Ratification | 24/11/1959 | |
| PORTUGAL | Signature | 11/05/1959 | |
| PORTUGAL | Ratification | 03/04/1962 | |
| SWEDEN | Signature | 11/05/1959 | |
| SWEDEN | Ratification | 17/03/1960 | |
| SWITZERLAND | Signature | 11/05/1959 | |
| SWITZERLAND | Ratification | 07/12/1959 | |
| TURKEY | Signature | 11/05/1959 | |
| TURKEY | Ratification | 16/11/1962 | |
| UNITED KINGDOM | Signature | 11/05/1959 | |
| UNITED KINGDOM | Ratification | 06/05/1960 | |