| Country | Action | Action Date | Effective Date |
|---|
| AUSTRIA | Signature | 19/08/1930 | |
| BELGIUM | Signature | 24/03/1930 | |
| BELGIUM | Ratification | 29/08/1930 | |
| BULGARIA | Signature | 24/03/1930 | |
| CZECHOSLOVAKIA | Signature | 24/03/1930 | |
| ESTONIA | Signature | 24/03/1930 | |
| FINLAND | Signature | 24/03/1930 | |
| FRANCE | Signature | 24/03/1930 | |
| GERMANY | Signature | 24/03/1930 | |
| GREECE | Signature | 24/03/1930 | |
| GREECE | Ratification | 16/01/1931 | |
| HUNGARY | Signature | 24/03/1930 | |
| IRELAND, REPUBLIC OF | Signature | 24/03/1930 | |
| ITALY | Signature | 24/03/1930 | |
| LATVIA | Signature | 24/03/1930 | |
| LITHUANIA | Signature | 24/03/1930 | |
| LUXEMBOURG | Signature | 24/03/1930 | |
| LUXEMBOURG | Ratification | 03/11/1930 | |
| NETHERLANDS THE | Signature | 24/03/1930 | |
| NORWAY | Signature | 24/03/1930 | |
| POLAND | Signature | 24/03/1930 | |
| PORTUGAL | Signature | 24/03/1930 | |
| ROUMANIA | Signature | 24/03/1930 | |
| SPAIN | Signature | 02/10/1930 | |
| SWEDEN | Signature | 24/03/1930 | |
| SWITZERLAND | Signature | 24/03/1930 | |
| UNITED KINGDOM | Signature | 24/03/1930 | |
| YUGOSLAVIA | Signature | 24/03/1930 | |