| Country | Action | Action Date | Effective Date |
|---|
| ALBANIA | Signature | 04/06/1998 | |
| Antilles | Extension | 01/01/1986 | |
| Aruba | Extension | 01/01/1986 | |
| AUSTRIA | Signature | 13/11/1958 | 13/11/1958 |
| BELGIUM | Signature | 15/12/1956 | |
| BELGIUM | Ratification | 07/09/1961 | 07/09/1961 |
| BULGARIA | Signature | 11/05/1995 | |
| CROATIA | Signature | 11/10/1997 | |
| CROATIA | Ratification | 11/10/1997 | |
| CYPRUS | Signature | 16/12/1961 | |
| CYPRUS | Ratification | 30/11/1967 | 30/11/1967 |
| CZECH REPUBLIC | Signature | 28/04/1995 | |
| CZECH REPUBLIC | Ratification | 30/05/1995 | 30/05/1995 |
| DENMARK | Definitive Signature | 15/12/1956 | 15/12/1956 |
| FINLAND | Signature | 16/11/1989 | |
| FINLAND | Ratification | 11/12/1989 | 11/12/1989 |
| FRANCE | Signature | 15/12/1956 | |
| FRANCE | Ratification | 10/03/1978 | 10/03/1978 |
| GERMANY FEDERAL REPUBLIC | Signature | 15/12/1956 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 07/07/1960 | 07/07/1960 |
| GREECE | Signature | 15/12/1956 | |
| GREECE | Ratification | 02/02/1961 | 02/02/1961 |
| HUNGARY | Signature | 09/02/1993 | |
| HUNGARY | Ratification | 12/01/1996 | 12/01/1996 |
| ICELAND | Signature | 15/12/1956 | 15/12/1956 |
| IRELAND, REPUBLIC OF | Signature | 21/09/1967 | |
| IRELAND, REPUBLIC OF | Ratification | 21/09/1967 | 21/09/1967 |
| ITALY | Signature | 15/12/1956 | |
| ITALY | Ratification | 04/06/1958 | 04/06/1958 |
| Land Berlin | Extension | 07/07/1960 | 07/07/1960 |
| LATVIA | Signature | 15/01/1998 | 15/01/1998 |
| LIECHTENSTEIN | Signature | 16/05/1979 | |
| LIECHTENSTEIN | Ratification | 11/12/1979 | 11/12/1979 |
| LUXEMBOURG | Signature | 15/12/1956 | |
| LUXEMBOURG | Ratification | 08/01/1960 | 08/01/1960 |
| MALTA | Signature | 12/12/1966 | |
| MALTA | Ratification | 06/05/1969 | 06/05/1969 |
| NETHERLANDS THE | Signature | 29/04/1957 | 29/04/1957 |
| NETHERLANDS THE | Declaration | 29/04/1957 | |
| NETHERLANDS THE | Declaration | 01/01/1986 | 01/01/1986 |
| NORWAY | Signature | 15/12/1956 | 15/12/1956 |
| POLAND | Signature | 16/03/1993 | |
| POLAND | Ratification | 22/04/1993 | 22/04/1993 |
| PORTUGAL | Signature | 27/04/1978 | |
| PORTUGAL | Ratification | 06/07/1982 | 06/07/1982 |
| ROMANIA | Signature | 04/10/1994 | 04/10/1994 |
| RUSSIAN FEDERATION | Signature | 28/02/1996 | 28/02/1966 |
| SAN MARINO | Signature | 01/03/1989 | |
| SAN MARINO | Ratification | 22/03/1989 | 22/03/1989 |
| SLOVAK REPUBLIC | Signature | 05/12/1996 | |
| SLOVAK REPUBLIC | Ratification | 15/07/1997 | 15/07/1997 |
| SLOVENIA | Signature | 27/05/1994 | |
| SLOVENIA | Ratification | 08/11/1994 | 08/11/1994 |
| SPAIN | Signature | 23/07/1987 | |
| SPAIN | Ratification | 23/06/1989 | 23/06/1989 |
| Surinam | Extension | 29/04/1957 | |
| SWEDEN | Signature | 15/12/1956 | 15/12/1956 |
| SWITZERLAND | Signature | 15/04/1964 | |
| SWITZERLAND | Ratification | 29/11/1965 | 29/11/1965 |
| TURKEY | Signature | 25/09/1957 | |
| TURKEY | Ratification | 07/01/1960 | 07/01/1960 |
| UNITED KINGDOM | Signature | 15/12/1956 | |
| UNITED KINGDOM | Ratification | 08/07/1958 | 08/07/1958 |
| West Indies | Extension | 29/04/1957 | |