| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| AUSTRIA | Signature | 31/03/1922 | |
| BELGIUM | Signature | 31/03/1922 | |
| BULGARIA | Signature | 31/03/1922 | |
| CZECHOSLOVAKIA | Signature | 31/03/1922 | |
| FRANCE | Signature | 31/03/1922 | |
| GERMANY | Signature | 31/03/1922 | |
| GREECE | Signature | 31/03/1922 | |
| HUNGARY | Signature | 31/03/1922 | |
| ITALY | Signature | 31/03/1922 | |
| ROUMANIA | Signature | 31/03/1922 | |
| SERB-CROAT-SLOVENE STATE | Signature | 31/03/1922 | |
| UNITED KINGDOM | Signature | 31/03/1922 |