| Country | Action | Action Date | Effective Date |
|---|
| AUSTRALIA | Accession | 22/09/1952 | |
| BELGIUM | Signature | 20/08/1929 | |
| BULGARIA | Signature | 20/08/1929 | |
| BULGARIA | Reservation | 20/08/1929 | |
| COSTA RICA | Accession | 21/03/1952 | |
| CUBA | Accession | 23/05/1933 | |
| DENMARK | Signature | 20/08/1929 | |
| DENMARK | Ratification | 20/08/1929 | |
| DOMINICAN REPUBLIC | Accession | 25/04/1952 | |
| EGYPT | Signature | 20/08/1929 | |
| EGYPT | Reservation | 20/08/1929 | |
| FINLAND | Accession | 20/05/1935 | |
| FRANCE | Signature | 20/08/1929 | |
| FRANCE | Declaration | 20/08/1929 | |
| GREECE | Signature | 20/08/1929 | |
| HUNGARY | Accession | 04/10/1930 | |
| ICELAND | Accession | 10/12/1930 | |
| ITALY | Signature | 20/08/1929 | |
| ITALY | Reservation | 20/08/1929 | |
| ITALY | Declaration | 20/08/1929 | |
| LATVIA | Signature | 20/08/1929 | |
| LUXEMBOURG | Accession | 13/06/1951 | |
| NETHERLANDS THE | Signature | 20/08/1929 | |
| NETHERLANDS THE | Reservation | 20/08/1929 | |
| NORWAY | Signature | 20/08/1929 | |
| PERU | Accession | 05/09/1952 | |
| POLAND | Accession | 02/06/1931 | |
| ROUMANIA | Signature | 20/08/1929 | |
| SOUTH AFRICA | Accession | 05/07/1952 | |
| SWEDEN | Signature | 20/08/1929 | |
| SWEDEN | Reservation | 20/08/1929 | |
| SWITZERLAND | Signature | 20/08/1929 | |
| SWITZERLAND | Reservation | 20/08/1929 | |
| UNITED KINGDOM | Accession | 01/08/1939 | |
| UNITED KINGDOM | Reservation | 01/08/1939 | |
| VATICAN CITY | Accession | 08/01/1952 | |
| YUGOSLAVIA | Signature | 20/08/1929 | |