| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 24/09/1976 | |
| DENMARK | Signature | 29/04/1977 | |
| EUROPEAN SPACE AGENCY | Definitive Signature | 22/06/1976 | |
| FRANCE | Definitive Signature | 29/04/1977 | |
| GERMANY FEDERAL REPUBLIC | Definitive Signature | 16/02/1977 | |
| ITALY | Definitive Signature | 05/08/1977 | |
| SWITZERLAND | Signature | 22/06/1976 | |
| SWITZERLAND | Ratification | 14/03/1979 | |
| UNITED KINGDOM | Signature | 22/06/1976 | |
| UNITED KINGDOM | Definitive Signature | 22/06/1976 |