| Country | Action | Action Date | Effective Date |
|---|
| AUSTRIA | Signature | 11/07/1928 | |
| AUSTRIA | Ratification | 26/06/1929 | |
| BELGIUM | Signature | 11/07/1928 | |
| BELGIUM | Ratification | 27/04/1929 | |
| BELGIUM | Declaration | 27/04/1929 | |
| BULGARIA | Signature | 11/07/1928 | |
| CZECHOSLOVAKIA | Signature | 11/07/1928 | |
| CZECHOSLOVAKIA | Ratification | 28/06/1929 | |
| DENMARK | Signature | 11/07/1928 | |
| DENMARK | Ratification | 14/06/1929 | |
| FINLAND | Ratification | 27/06/1929 | |
| FINLAND | Signature | 11/07/1929 | |
| FRANCE | Signature | 11/07/1928 | |
| FRANCE | Ratification | 30/06/1929 | |
| GERMANY | Signature | 11/07/1928 | |
| GERMANY | Ratification | 30/06/1929 | |
| HUNGARY | Signature | 11/07/1928 | |
| HUNGARY | Ratification | 26/07/1929 | |
| ITALY | Signature | 11/07/1928 | |
| ITALY | Ratification | 29/06/1929 | |
| LUXEMBOURG | Signature | 11/07/1928 | |
| LUXEMBOURG | Ratification | 27/06/1929 | |
| NETHERLANDS THE | Signature | 11/07/1928 | |
| NETHERLANDS THE | Ratification | 28/06/1929 | |
| NORWAY | Signature | 11/07/1928 | |
| NORWAY | Ratification | 26/09/1930 | |
| POLAND | Signature | 11/07/1928 | |
| POLAND | Ratification | 08/08/1931 | |
| ROUMANIA | Signature | 11/07/1928 | |
| ROUMANIA | Ratification | 30/06/1929 | |
| SERB-CROAT-SLOVENE STATE | Signature | 11/07/1928 | |
| SERB-CROAT-SLOVENE STATE | Ratification | 30/09/1929 | |
| SWEDEN | Signature | 11/07/1928 | |
| SWEDEN | Ratification | 27/06/1929 | |
| SWITZERLAND | Signature | 11/07/1928 | |
| SWITZERLAND | Ratification | 27/06/1929 | |
| TURKEY | Signature | 11/07/1928 | |
| TURKEY | Reservation | 11/07/1928 | |
| UNITED KINGDOM | Signature | 11/07/1928 | |
| UNITED KINGDOM | Ratification | 09/04/1929 | |