| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| AUSTRIA | Signature | 04/10/1922 | |
| AUSTRIA | Ratification | 02/12/1922 | |
| BELGIUM | Signature | 12/06/1923 | |
| CZECHOSLOVAKIA | Signature | 04/10/1922 | |
| FRANCE | Signature | 04/10/1922 | |
| ITALY | Signature | 04/10/1922 | |
| SPAIN | Signature | 03/11/1922 | |
| UNITED KINGDOM | Signature | 04/10/1922 |