| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| ALBANIA | Ratification | 03/06/1957 | |
| ALGERIA | Ratification | 19/10/1962 | |
| ARGENTINA | Ratification | 17/02/1955 | |
| AZERBAIJAN | Ratification | 19/05/1992 | |
| BOLIVIA | Ratification | 15/11/1973 | 15/11/1974 |
| BULGARIA | Ratification | 29/12/1949 | |
| BYELORUSSIA S S R | Ratification | 06/11/1956 | |
| CAMEROON | Ratification | 25/05/1970 | |
| COMOROS | Succession | 23/10/1978 | |
| CUBA | Ratification | 07/09/1954 | |
| CZECH REPUBLIC | Succession | 01/01/1993 | 01/01/1993 |
| CZECHOSLOVAKIA | Ratification | 23/04/1980 | 23/04/1981 |
| DJIBOUTI | Succession | 03/08/1978 | 03/08/1978 |
| ECUADOR | Ratification | 26/08/1975 | |
| EL SALVADOR | Ratification | 15/06/1995 | |
| FRANCE | Ratification | 28/06/1951 | |
| French Overseas Territories | Extension | 27/11/1974 | |
| GERMAN DEMOCRATIC REPUBLIC | Ratification | 19/06/1979 | 19/06/1980 |
| GREECE | Ratification | 28/08/1981 | 28/08/1982 |
| GUATEMALA | Ratification | 13/02/1952 | |
| HAITI | Ratification | 12/04/1957 | |
| HONDURAS | Ratification | 20/06/1960 | |
| HUNGARY | Ratification | 08/06/1956 | |
| IRAQ | Ratification | 05/07/1960 | |
| ISRAEL | Ratification | 23/12/1953 | |
| ITALY | Ratification | 22/10/1952 | |
| KYRGYZSTAN | Succession | 31/03/1992 | 31/03/1992 |
| LEBANON | Ratification | 01/06/1977 | 01/06/1978 |
| LUXEMBOURG | Ratification | 03/03/1958 | |
| MALTA | Ratification | 18/05/1990 | |
| NICARAGUA | Ratification | 01/03/1976 | |
| PANAMA | Ratification | 19/06/1970 | |
| PARAGUAY | Ratification | 21/03/1966 | |
| PERU | Ratification | 04/04/1962 | |
| POLAND | Ratification | 11/12/1947 | |
| PORTUGAL | Ratification | 23/05/1983 | 23/05/1984 |
| SLOVAK REPUBLIC | Succession | 01/01/1993 | 01/01/1993 |
| SOVIET UNION | Ratification | 10/08/1956 | |
| SPAIN | Ratification | 05/05/1971 | |
| TAJIKISTAN | Succession | 26/11/1993 | 26/11/1993 |
| UKRAINE | Ratification | 14/09/1956 | |
| UNITED KINGDOM | |||
| URUGUAY | Ratification | 18/03/1954 |