| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 29/10/1968 | |
| BELGIUM | Ratification | 20/04/1970 | 16/02/1971 |
| DENMARK | Definitive Signature | 15/01/1971 | 16/02/1971 |
| FRANCE | Signature | 15/07/1969 | |
| FRANCE | Approval | 29/04/1971 | 30/05/1971 |
| GERMANY FEDERAL REPUBLIC | Signature | 16/09/1968 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 01/02/1973 | 02/03/1973 |
| ITALY | Signature | 21/05/1975 | |
| ITALY | Ratification | 27/11/1978 | 28/12/1978 |
| Land Berlin | Extension | 01/02/1973 | 02/03/1973 |
| LUXEMBOURG | Signature | 13/12/1968 | |
| LUXEMBOURG | Ratification | 10/10/1980 | 11/11/1980 |
| NETHERLANDS THE | Signature | 17/12/1969 | |
| NETHERLANDS THE | Ratification | 27/01/1971 | |
| SPAIN | Acceptance | 10/09/1975 | 11/10/1975 |
| SWITZERLAND | Signature | 04/10/1973 | |
| SWITZERLAND | Ratification | 21/11/1975 | 22/12/1975 |
| UNITED KINGDOM | Signature | 16/09/1968 | |
| UNITED KINGDOM | Definitive Signature | 16/09/1968 | 16/02/1971 |