| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| FRANCE | Signature | 20/01/1930 | |
| GERMANY | Signature | 20/01/1930 | |
| ITALY | Signature | 20/01/1930 | |
| JAPAN | Signature | 20/01/1930 | |
| PORTUGAL | Signature | 20/01/1930 | |
| UNITED KINGDOM | Signature | 20/01/1930 | |
| YUGOSLAVIA | Signature | 20/01/1930 |