| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 28/08/1952 | |
| BELGIUM | Ratification | 11/03/1954 | |
| CANADA | Signature | 28/08/1952 | |
| DENMARK | Signature | 28/08/1952 | |
| DENMARK | Ratification | 28/05/1955 | |
| FRANCE | Signature | 28/08/1952 | |
| FRANCE | Ratification | 20/01/1955 | |
| FRANCE | Withdrawal | 31/03/1967 | |
| GERMANY FEDERAL REPUBLIC | Accession | 21/11/1969 | 21/12/1969 |
| GREECE | Signature | 28/08/1952 | |
| GREECE | Ratification | 26/07/1954 | |
| HUNGARY | Accession | 21/01/2000 | 20/02/2000 |
| ICELAND | Signature | 28/08/1952 | |
| ICELAND | Ratification | 11/05/1953 | |
| ITALY | Signature | 28/08/1952 | |
| ITALY | Ratification | 22/12/1955 | |
| LATVIA | Accession | 02/08/2004 | 01/01/1900 |
| LATVIA | Def EIF | 01/09/2004 | 01/01/1900 |
| LITHUANIA | Accession | 21/07/2004 | 01/01/1900 |
| LITHUANIA | Def EIF | 20/08/2004 | 01/01/1900 |
| LUXEMBOURG | Signature | 28/08/1952 | |
| LUXEMBOURG | Ratification | 23/07/1954 | |
| NETHERLANDS THE | Signature | 28/08/1952 | |
| NETHERLANDS THE | Ratification | 22/06/1954 | |
| NORWAY | Signature | 28/08/1952 | |
| NORWAY | Ratification | 24/02/1953 | |
| POLAND | Accession | 21/09/1999 | 21/10/1999 |
| PORTUGAL | Signature | 28/08/1952 | |
| PORTUGAL | Ratification | 22/11/1955 | |
| SLOVAK REPUBLIC | Accession | 13/09/2004 | 01/01/1900 |
| SLOVAK REPUBLIC | Def EIF | 13/10/2004 | 01/01/1900 |
| SLOVENIA | Accession | 28/09/2004 | 01/01/1900 |
| SLOVENIA | Def EIF | 28/10/2004 | 01/01/1900 |
| TURKEY | Signature | 28/08/1952 | |
| TURKEY | Ratification | 18/05/1954 | |
| UNITED KINGDOM | Signature | 28/08/1952 | |
| UNITED KINGDOM | Ratification | 03/08/1965 | |
| UNITED KINGDOM | Ratification | 03/08/1965 | 02/09/1965 |
| UNITED STATES OF AMERICA | Signature | 28/08/1952 | |
| UNITED STATES OF AMERICA | Ratification | 24/07/1953 | |