| Country | Action | Action Date | Effective Date |
|---|
| AUSTRIA | Signature | 04/08/1931 | |
| BELGIUM | Signature | 28/03/1931 | |
| BULGARIA | Signature | 27/02/1932 | |
| CZECHOSLOVAKIA | Signature | 28/06/1933 | |
| DENMARK | Signature | 28/03/1931 | |
| FRANCE | Signature | 28/03/1931 | |
| GERMANY | Signature | 28/03/1931 | |
| GREECE | Signature | 18/08/1931 | |
| HUNGARY | Signature | 14/08/1931 | |
| Irish Free State | Signature | 06/05/1931 | |
| ITALY | Signature | 27/05/1931 | |
| LUXEMBOURG | Signature | 28/03/1931 | |
| NETHERLANDS THE | Signature | 28/03/1931 | |
| NORWAY | Signature | 27/09/1932 | |
| POLAND | Signature | 09/09/1932 | |
| PORTUGAL | Signature | 26/08/1931 | |
| ROUMANIA | Signature | 19/06/1935 | |
| SOVIET UNION | Signature | 06/09/1935 | |
| SPAIN | Signature | 08/07/1931 | |
| SWEDEN | Signature | 12/02/1932 | |
| SWITZERLAND | Signature | 28/03/1931 | |
| UNITED KINGDOM | Signature | 28/03/1931 | |
| YUGOSLAVIA | Signature | 28/03/1931 | |