| Act(s) | Article(s) | Signature | Instrument | Entry into Force |
|---|---|---|---|---|
| Additional Act of Stockholm (1967) | Accession : December 3, 1974 | March 6, 1975 | ||
| Lisbon Act (1958) | Accession : December 3, 1974 | March 6, 1975 | ||
| London Act (1934) | Accession : March 5, 1951 | July 1, 1952 |