| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 20/01/1930 | |
| BELGIUM | Ratification | 09/05/1930 | |
| FRANCE | Signature | 20/01/1930 | |
| FRANCE | Ratification | 09/05/1930 | |
| GERMANY | Signature | 20/01/1930 | |
| GERMANY | Ratification | 26/03/1930 | |
| GREECE | Signature | 20/01/1930 | |
| GREECE | Ratification | 25/06/1930 | |
| ITALY | Signature | 20/01/1930 | |
| ITALY | Ratification | 09/05/1930 | |
| PORTUGAL | Signature | 20/01/1930 | |
| PORTUGAL | Ratification | 11/07/1931 | |
| ROUMANIA | Signature | 20/01/1930 | |
| ROUMANIA | Ratification | 23/06/1930 | |
| UNITED KINGDOM | Signature | 20/01/1930 | |
| UNITED KINGDOM | Ratification | 09/05/1930 | |
| YUGOSLAVIA | Signature | 20/01/1930 | |
| YUGOSLAVIA | Ratification | 31/05/1930 | |