| Country | Action | Action Date | Effective Date |
|---|
| AUSTRIA | Signature | 24/03/1930 | |
| BELGIUM | Signature | 24/03/1930 | |
| BELGIUM | Ratification | 29/08/1930 | |
| BELGIUM | Declaration | 29/08/1930 | |
| DENMARK | Signature | 24/03/1930 | |
| DENMARK | Ratification | 31/10/1930 | |
| ESTONIA | Signature | 24/03/1930 | |
| FINLAND | Signature | 24/03/1930 | |
| FINLAND | Ratification | 31/10/1930 | |
| FINLAND | Declaration | 31/10/1930 | |
| FRANCE | Signature | 24/03/1930 | |
| FRANCE | Ratification | 04/05/1931 | |
| GERMANY | Signature | 24/03/1930 | |
| GREECE | Signature | 24/03/1930 | |
| GREECE | Ratification | 16/01/1931 | |
| ITALY | Signature | 24/03/1930 | |
| ITALY | Ratification | 26/11/1930 | |
| LATVIA | Signature | 24/03/1930 | |
| LATVIA | Ratification | 31/10/1930 | |
| LUXEMBOURG | Signature | 24/03/1930 | |
| LUXEMBOURG | Ratification | 03/11/1930 | |
| NETHERLANDS THE | Signature | 24/03/1930 | |
| NETHERLANDS THE | Ratification | 10/03/1931 | |
| NORWAY | Signature | 24/03/1930 | |
| NORWAY | Ratification | 18/06/1930 | |
| POLAND | Signature | 24/03/1930 | |
| ROMANIA | Signature | 24/03/1930 | |
| SWEDEN | Signature | 24/03/1930 | |
| SWEDEN | Ratification | 27/10/1930 | |
| SWITZERLAND | Signature | 24/03/1930 | |
| SWITZERLAND | Ratification | 23/10/1930 | |
| UNITED KINGDOM | Signature | 24/03/1930 | |
| UNITED KINGDOM | Ratification | 25/10/1930 | |