| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 14/06/1928 | |
| BRAZIL | Signature | 14/06/1928 | |
| CZECHOSLOVAKIA | Signature | 14/06/1928 | |
| FRANCE | Signature | 14/06/1928 | |
| GREECE | Signature | 14/06/1928 | |
| ITALY | Signature | 14/06/1928 | |
| JAPAN | Signature | 14/06/1928 | |
| POLAND | Signature | 14/06/1928 | |
| PORTUGAL | Signature | 14/06/1928 | |
| ROUMANIA | Signature | 14/06/1928 | |
| SERB-CROAT-SLOVENE STATE | Signature | 14/06/1928 | |
| UNITED KINGDOM | Signature | 14/06/1928 | |
| UNITED STATES OF AMERICA | Signature | 14/06/1928 |