| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 16/10/1925 | |
| BELGIUM | Ratification | 14/09/1926 | |
| FRANCE | Signature | 16/10/1925 | |
| FRANCE | Ratification | 14/09/1926 | |
| GERMANY | Signature | 16/10/1925 | |
| GERMANY | Ratification | 14/09/1926 | |
| ITALY | Signature | 16/10/1925 | |
| ITALY | Ratification | 14/09/1926 | |
| UNITED KINGDOM | Signature | 16/10/1925 | |
| UNITED KINGDOM | Ratification | 14/09/1926 |