| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| Berlin West | Accession | 26/08/1957 | |
| BULGARIA | Accession | 21/08/1972 | |
| BULGARIA | Withdrawal | 05/07/1979 | 31/12/1979 |
| CANADA | Signature | 08/02/1949 | |
| CANADA | Ratification | 03/07/1950 | |
| CANADA | Withdrawal | 29/06/1976 | 31/12/1976 |
| CUBA | Accession | 28/11/1975 | |
| CUBA | Withdrawal | 02/08/1979 | 31/12/1979 |
| DENMARK | Signature | 08/02/1949 | |
| DENMARK | Ratification | 14/12/1950 | |
| DENMARK | Withdrawal | 31/12/1978 | |
| FRANCE | Signature | 08/02/1949 | |
| FRANCE | Ratification | 27/01/1953 | |
| FRANCE | Withdrawal | 19/07/1978 | 31/12/1978 |
| GERMAN DEMOCRATIC REPUBLIC | Accession | 21/05/1974 | |
| GERMANY FEDERAL REPUBLIC | Accession | 27/06/1957 | |
| GERMANY FEDERAL REPUBLIC | Extension | 26/08/1957 | |
| ICELAND | Signature | 08/02/1949 | |
| ICELAND | Ratification | 13/02/1950 | |
| ITALY | Signature | 08/02/1949 | |
| ITALY | Ratification | 19/08/1952 | |
| ITALY | Withdrawal | 31/12/1978 | 31/12/1978 |
| JAPAN | Accession | 01/07/1979 | |
| JAPAN | Withdrawal | 31/07/1979 | 31/12/1979 |
| NORWAY | Signature | 08/02/1949 | |
| NORWAY | Ratification | 02/07/1952 | |
| POLAND | Accession | 21/11/1961 | |
| PORTUGAL | Signature | 08/02/1949 | |
| PORTUGAL | Ratification | 19/07/1952 | |
| ROMANIA | Accession | 21/03/1967 | |
| SOVIET UNION | Accession | 10/04/1958 | |
| SPAIN | Signature | 08/02/1949 | |
| SPAIN | Ratification | 17/01/1952 | |
| UNITED KINGDOM | Signature | 08/02/1949 | |
| UNITED KINGDOM | Ratification | 15/12/1949 | |
| UNITED KINGDOM | Withdrawal | 29/06/1978 | 31/12/1978 |
| UNITED STATES OF AMERICA | Signature | 08/02/1949 | |
| UNITED STATES OF AMERICA | Ratification | 01/09/1949 | |
| UNITED STATES OF AMERICA | Withdrawal | 22/06/1976 | 31/12/1976 |