| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 20/01/1930 | |
| FRANCE | Signature | 20/01/1930 | |
| GERMANY | Signature | 20/01/1930 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 01/01/1953 | |
| ITALY | Signature | 20/01/1930 | |
| JAPAN | Signature | 20/01/1930 | |
| SWITZERLAND | Signature | 26/02/1930 | |
| UNITED KINGDOM | Signature | 20/01/1930 |