| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 29/02/1968 | |
| BELGIUM | Ratification | 27/08/1970 | |
| FRANCE | Signature | 29/02/1968 | |
| FRANCE | Ratification | 13/04/1970 | |
| GERMANY FEDERAL REPUBLIC | Signature | 29/02/1968 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 30/11/1972 | |
| GERMANY FEDERAL REPUBLIC | Declaration | 30/11/1972 | |
| ITALY | Signature | 29/02/1968 | |
| ITALY | Ratification | 01/02/1971 | |
| Land Berlin | Extension | 30/11/1972 | |
| LUXEMBOURG | Signature | 29/02/1968 | |
| LUXEMBOURG | Ratification | 08/10/1973 | |
| LUXEMBOURG | Declaration | 08/10/1973 | |
| NETHERLANDS THE | Signature | 29/02/1968 | |
| UNITED KINGDOM | | | |