| Country | Action | Action Date | Effective Date |
|---|
| AUSTRIA | Signature | 29/04/1964 | |
| AUSTRIA | Ratification | 21/10/1964 | |
| BELGIUM | Signature | 29/04/1964 | |
| BELGIUM | Ratification | 22/11/1968 | |
| BULGARIA | Signature | 29/04/1964 | |
| CZECHOSLOVAKIA | Signature | 29/04/1964 | |
| DENMARK | Signature | 29/04/1964 | |
| FINLAND | Signature | 29/04/1964 | |
| FRANCE | Signature | 29/04/1964 | |
| GREECE | Signature | 29/04/1964 | |
| HUNGARY | Signature | 29/04/1964 | |
| ITALY | Signature | 29/04/1964 | |
| LIECHTENSTEIN | Signature | 29/04/1964 | |
| LUXEMBOURG | Signature | 29/04/1964 | |
| LUXEMBOURG | Ratification | 26/11/1964 | |
| NETHERLANDS THE | Signature | 29/04/1964 | |
| NORWAY | Signature | 29/04/1964 | |
| POLAND | Signature | 29/04/1964 | |
| PORTUGAL | Signature | 29/04/1964 | |
| ROMANIA | Signature | 29/04/1964 | |
| SPAIN | Signature | 29/04/1964 | |
| SWEDEN | Signature | 29/04/1964 | |
| SWITZERLAND | Signature | 29/04/1964 | |
| TURKEY | Signature | 29/04/1964 | |
| TURKEY | Ratification | 31/01/1966 | |
| UNITED KINGDOM | Signature | 24/04/1964 | |
| UNITED KINGDOM | Signature | 29/04/1964 | |
| UNITED KINGDOM | Ratification | 05/09/1972 | |
| YUGOSLAVIA | Signature | 29/04/1964 | |
| YUGOSLAVIA | Ratification | 27/01/1965 | |