| Country | Action | Action Date | Effective Date |
|---|
| AUSTRIA | Signature | 21/02/1962 | |
| AUSTRIA | Ratification | 26/09/1962 | |
| BELGIUM | Definitive Signature | 21/12/1960 | |
| DENMARK | Definitive Signature | 21/12/1960 | |
| FRANCE | Definitive Signature | 21/12/1960 | |
| GERMANY | Definitive Signature | 21/12/1960 | |
| ITALY | Signature | 21/02/1962 | |
| NETHERLANDS THE | Definitive Signature | 21/12/1960 | |
| NORWAY | Definitive Signature | 21/12/1960 | |
| SPAIN | Definitive Signature | 21/12/1960 | |
| SWEDEN | Definitive Signature | 21/12/1960 | |
| SWITZERLAND | Definitive Signature | 21/12/1960 | |
| UNITED KINGDOM | Definitive Signature | 21/12/1960 | |