| Act(s) | Article(s) | Signature | Instrument | Entry into Force |
|---|---|---|---|---|
| Additional Act of Stockholm (1967) | January 12, 1968 | Ratification : July 4, 1980 | October 7, 1980 | |
| Lisbon Act (1958) | October 31, 1958 | Accession : July 24, 1964 | October 11, 1964 | |
| London Act (1934) | June 2, 1934 | |||
| The Hague Act (1925) | November 6, 1925 | |||
| Washington Act (1911) | June 2, 1911 | Accession : November 22, 1921 | January 3, 1922 |