| Country | Action | Action Date | Effective Date |
|---|
| ARGENTINA | Denunciation | | 24/05/1947 |
| Australia | Extension | 01/05/1920 | |
| BELGIUM | Signature | 01/05/1920 | |
| BOLIVIA | Signature | 01/05/1920 | |
| BRAZIL | Accession | 28/06/1921 | |
| Canada | Extension | 01/05/1920 | |
| CHINA | Signature | 01/05/1920 | |
| CUBA | Denunciation | | 10/06/1949 |
| CUBA | Signature | 01/05/1920 | |
| CZECHOSLOVAKIA | Signature | 01/05/1920 | |
| DENMARK | Denunciation | | 05/03/1948 |
| ECUADOR | Signature | 01/05/1920 | |
| FINLAND | Denunciation | | 01/07/1948 |
| FRANCE | Denunciation | | 20/03/1948 |
| FRANCE | Signature | 01/05/1920 | |
| GREECE | Signature | 01/05/1920 | |
| India | Extension | 01/05/1920 | |
| ITALY | Denunciation | | 29/09/1948 |
| ITALY | Signature | 01/05/1920 | |
| JAPAN | Signature | 01/05/1920 | |
| NETHERLANDS THE | Denunciation | | 18/04/1948 |
| New Zealand | Extension | 01/05/1920 | |
| NORWAY | Denunciation | | 12/03/1948 |
| PANAMA | Signature | 01/05/1920 | |
| PARAGUAY | Denunciation | | 04/11/1948 |
| PERU | Denunciation | | 20/05/1948 |
| POLAND | Denunciation | | 01/07/1948 |
| POLAND | Signature | 01/05/1920 | |
| PORTUGAL | Signature | 01/05/1920 | |
| ROUMANIA | Denunciation | | 31/03/1948 |
| ROUMANIA | Signature | 01/05/1920 | |
| SERBIA | Signature | 01/05/1920 | |
| SIAM | Denunciation | | 04/04/1948 |
| SIAM | Signature | 01/05/1920 | |
| South Africa | Denunciation | | 01/03/1948 |
| South Africa | Extension | 01/05/1920 | |
| SPAIN | Denunciation | | 05/03/1948 |
| UNITED KINGDOM | Signature | 01/05/1920 | |
| UNITED STATES OF AMERICA | Signature | 01/05/1920 | |
| URUGUAY | Signature | 01/05/1920 | |
| YUGOSLAVIA | Denunciation | | 01/04/1948 |