| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| FRANCE | Signature | 18/08/1938 | |
| FRANCE | Ratification | 06/04/1939 | |
| GERMANY | Accession | 13/05/1939 | |
| ITALY | Accession | 13/05/1939 | |
| ROUMANIA | Signature | 18/08/1938 | |
| ROUMANIA | Ratification | 30/03/1939 | |
| UNITED KINGDOM | Signature | 18/08/1938 | |
| UNITED KINGDOM | Ratification | 27/04/1939 |