| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| FRANCE | Signature | 16/12/1930 | |
| GERMANY | Signature | 16/12/1930 | |
| ITALY | Signature | 16/12/1930 | |
| ITALY | Ratification | 26/03/1932 | |
| JAPAN | Signature | 16/12/1930 | |
| NETHERLANDS THE | Signature | 16/12/1930 | |
| NETHERLANDS THE | Ratification | 09/01/1932 | |
| UNITED KINGDOM | Signature | 16/12/1930 |