Artikel 19

The Contracting States undertake to introduce into those conventions in force on December 9th, 1923, which contravene the provisions of this Statute, so soon as circumstances permit and in any case on the expiry of such conventions, the modifications required to bring them into harmony with such provisions, so far as the geographical, economic or technical circumstances of the countries or areas concerned allow.
The same shall apply to concessions granted before December 9th, 1923, for the total or partial exploitation of maritime ports.