| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 11/07/1975 | |
| BELGIUM | Approval | 29/12/1975 | |
| DENMARK | Signature | 11/07/1975 | |
| DENMARK | Approval | 11/11/1975 | |
| FRANCE | Signature | 11/07/1975 | |
| FRANCE | Approval | 29/12/1975 | |
| GERMANY FEDERAL REPUBLIC | Signature | 11/07/1975 | |
| GERMANY FEDERAL REPUBLIC | Approval | 30/12/1975 | |
| IRELAND, REPUBLIC OF | Signature | 11/07/1975 | |
| IRELAND, REPUBLIC OF | Approval | 06/02/1976 | |
| ITALY | Signature | 11/07/1975 | |
| ITALY | Approval | 17/02/1976 | |
| Land Berlin | Extension | 30/12/1975 | |
| LUXEMBOURG | Signature | 11/07/1975 | |
| LUXEMBOURG | Approval | 30/12/1975 | |
| NETHERLANDS THE | Signature | 11/07/1975 | |
| NETHERLANDS THE | Approval | 31/12/1975 | |
| UNITED KINGDOM | Signature | 11/07/1975 | |
| UNITED KINGDOM | Approval | 30/12/1975 | |