| Act(s) | Article(s) | Signature | Instrument | Entry into Force |
|---|---|---|---|---|
| Additional Act of Stockholm (1967) | July 14, 1967 | Ratification : August 12, 1969 | April 26, 1970 | |
| Lisbon Act (1958) | October 31, 1958 | Accession : August 14, 1969 | October 3, 1969 | |
| London Act (1934) | June 2, 1934 | Accession : March 31, 1953 | July 1, 1953 | |
| The Hague Act (1925) | Accession : October 4, 1933 | January 1, 1934 |