| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BULGARIA | Adherence | 21/08/1972 | |
| CANADA | Signature | 13/12/1965 | |
| CANADA | Ratification | 01/04/1966 | |
| CUBA | Adherence | 28/11/1975 | |
| DENMARK | Signature | 01/12/1965 | |
| DENMARK | Ratification | 14/08/1968 | |
| FRANCE | Signature | 13/12/1965 | |
| FRANCE | Approval | 15/02/1967 | |
| GERMAN DEMOCRATIC REPUBLIC | Adherence | 21/05/1974 | |
| GERMANY FEDERAL REPUBLIC | Signature | 08/12/1965 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 29/05/1969 | |
| ICELAND | Signature | 07/12/1965 | |
| ICELAND | Approval | 07/12/1965 | |
| ITALY | Signature | 13/12/1965 | |
| ITALY | Ratification | 19/12/1969 | |
| JAPAN | Accession | 01/07/1970 | |
| Land Berlin | Extension | 29/05/1969 | |
| NORWAY | Signature | 13/12/1965 | |
| NORWAY | Ratification | 09/03/1967 | |
| POLAND | Signature | 13/12/1965 | |
| POLAND | Ratification | 07/01/1969 | |
| PORTUGAL | Signature | 13/12/1965 | |
| PORTUGAL | Ratification | 19/12/1969 | |
| ROMANIA | Accession | 21/03/1967 | |
| SOVIET UNION | Signature | 02/12/1965 | |
| SOVIET UNION | Ratification | 23/10/1967 | |
| SPAIN | Signature | 08/12/1965 | |
| SPAIN | Ratification | 30/03/1967 | |
| UNITED KINGDOM | Signature | 08/12/1965 | |
| UNITED KINGDOM | Ratification | 15/08/1966 | |
| UNITED STATES OF AMERICA | Signature | 02/12/1965 | |
| UNITED STATES OF AMERICA | Ratification | 16/08/1966 | |
| UNITED STATES OF AMERICA | Withdrawal | 31/12/1976 |