| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 15/12/1975 | |
| DENMARK | Signature | 15/12/1975 | |
| FRANCE | Signature | 15/12/1975 | |
| GERMANY FEDERAL REPUBLIC | Signature | 15/12/1975 | |
| IRELAND, REPUBLIC OF | Signature | 15/12/1975 | |
| ITALY | Signature | 15/12/1975 | |
| LUXEMBOURG | Signature | 15/12/1975 | |
| NETHERLANDS THE | Signature | 15/12/1975 | |
| UNITED KINGDOM | Signature | 15/12/1975 |