| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| DENMARK | Signature | 23/04/1908 | |
| FRANCE | Signature | 23/04/1908 | |
| GERMANY | Signature | 23/04/1908 | |
| NETHERLANDS THE | Signature | 23/04/1908 | |
| SWEDEN | Signature | 23/04/1908 | |
| UNITED KINGDOM | Signature | 23/04/1908 | |
| UNITED KINGDOM | Ratification | 15/05/1908 |