| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 17/03/1954 | |
| DENMARK | Signature | 17/03/1954 | |
| FRANCE | Signature | 17/03/1954 | |
| GREECE | Signature | 17/03/1954 | |
| GREECE | Ratification | 11/12/1956 | |
| ITALY | Signature | 17/03/1954 | |
| ITALY | Ratification | 18/10/1957 | |
| LUXEMBOURG | Signature | 17/03/1954 | |
| MONTENEGRO | Succession to Signature | 23/10/2006 | |
| NETHERLANDS THE | Signature | 17/03/1954 | |
| NORWAY | Accession | 17/01/1956 | |
| SWEDEN | Signature | 17/03/1954 | |
| SWITZERLAND | Signature | 17/03/1954 | |
| UNITED KINGDOM | Signature | 17/03/1954 | |
| YUGOSLAVIA | Signature | 17/03/1954 | |
| YUGOSLAVIA, FEDERAL REPUBLIC OF | Succession to Signature | 12/03/2001 | 27/04/1992 |