| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 22/07/1975 | |
| BELGIUM | Ratification | 10/03/1977 | |
| Berlin West | Extension | 25/11/1976 | |
| DENMARK | Signature | 22/07/1975 | |
| DENMARK | Ratification | 23/07/1976 | |
| FRANCE | Signature | 22/07/1975 | |
| FRANCE | Ratification | 04/03/1977 | |
| GERMANY FEDERAL REPUBLIC | Signature | 22/07/1975 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 25/11/1976 | |
| IRELAND, REPUBLIC OF | Signature | 22/07/1975 | |
| IRELAND, REPUBLIC OF | Ratification | 23/05/1977 | |
| ITALY | Signature | 22/07/1975 | |
| ITALY | Ratification | 19/05/1977 | |
| LUXEMBOURG | Signature | 22/07/1975 | |
| LUXEMBOURG | Ratification | 11/10/1976 | |
| NETHERLANDS THE | Signature | 22/07/1975 | |
| NETHERLANDS THE | Ratification | 15/02/1977 | |
| UNITED KINGDOM | Signature | 22/07/1975 | |
| UNITED KINGDOM | Ratification | 29/03/1976 | |