| Country | Action | Action Date | Effective Date |
|---|
| Australia | Extension | 09/04/1931 | |
| BELGIUM | Signature | 28/04/1930 | |
| BELGIUM | Ratification | 09/04/1931 | |
| Canada | Extension | 09/04/1931 | |
| CZECHOSLOVAKIA | Signature | 28/04/1930 | |
| CZECHOSLOVAKIA | Ratification | 09/04/1931 | |
| CZECHOSLOVAKIA | Declaration | 09/04/1931 | |
| FRANCE | Signature | 28/04/1930 | |
| FRANCE | Ratification | 09/04/1931 | |
| GREECE | Signature | 28/04/1930 | |
| GREECE | Ratification | 09/04/1931 | |
| HUNGARY | Signature | 28/04/1930 | |
| HUNGARY | Ratification | 09/04/1931 | |
| India | Extension | 09/04/1931 | |
| ITALY | Signature | 28/04/1930 | |
| ITALY | Ratification | 09/04/1931 | |
| JAPAN | Signature | 28/04/1930 | |
| JAPAN | Ratification | 06/05/1932 | |
| New Zealand | Extension | 09/04/1931 | |
| POLAND | Signature | 28/04/1930 | |
| POLAND | Ratification | 21/04/1931 | |
| PORTUGAL | Signature | 28/04/1930 | |
| PORTUGAL | Ratification | 02/09/1931 | |
| ROUMANIA | Signature | 28/04/1930 | |
| ROUMANIA | Ratification | 09/04/1931 | |
| ROUMANIA | Declaration | 09/04/1931 | |
| South Africa | Extension | 09/04/1931 | |
| UNITED KINGDOM | Signature | 28/04/1930 | |
| UNITED KINGDOM | Ratification | 09/04/1931 | |
| YUGOSLAVIA | Signature | 28/04/1930 | |
| YUGOSLAVIA | Ratification | 09/04/1931 | |
| YUGOSLAVIA | Declaration | 09/04/1931 | |