| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| CONGO | Signature | 19/05/1900 | |
| FRANCE | Signature | 19/05/1900 | |
| GERMANY | Signature | 19/05/1900 | |
| ITALY | Signature | 19/05/1900 | |
| ITALY | Ratification | 06/07/1909 | |
| LIBERIA | Accession | 14/04/1904 | |
| PORTUGAL | Signature | 19/05/1900 | |
| SPAIN | Signature | 19/05/1900 | |
| UNITED KINGDOM | Signature | 19/05/1900 |