| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Definitive Signature | 01/04/1964 | |
| DENMARK | Definitive Signature | 31/03/1964 | |
| FRANCE | Definitive Signature | 10/04/1964 | |
| GERMANY FEDERAL REPUBLIC | Definitive Signature | 09/04/1964 | |
| IRELAND, REPUBLIC OF | Definitive Signature | 18/03/1964 | |
| ITALY | Definitive Signature | 10/04/1964 | |
| LUXEMBOURG | Definitive Signature | 10/04/1964 | |
| NETHERLANDS THE | Definitive Signature | 07/04/1964 | |
| PORTUGAL | Definitive Signature | 07/04/1964 | |
| SPAIN | Definitive Signature | 08/04/1964 | |
| SWEDEN | Definitive Signature | 08/04/1964 | |
| UNITED KINGDOM | Signature | 09/03/1964 | |
| UNITED KINGDOM | Definitive Signature | 09/03/1964 | |