All Contracting States are subject to Article
39 whether or not any declaration is made.
This point follows directly from the discussion
about the Article 29 priority system and is
the reason why Article 39 is regarded as an
exception. By ratifying the Convention, all
Contracting States are subject to Article 39 in
each Contracting State and its declarations of
priority under its national laws. We discussed
above the principle that for any nonconsensual
rights or interests that a Contracting State does
not make category declarations, they will be
unregistered interests subject to Article 29 and
so subordinate to any registered interests on
the International Registry