A treaty power is the country which joined, ratified and inherited in the treaty.
Ratification country... It is the Country which deliberated and recognized treaty in Parliament, and declared internationally.
Member nation Country... It is he Country which skipped the process of signature and accepted the treaty as it was.
Succession country ... It is the country which has inherited the treaty of a state of those days as it is like Czechoslovakia or the Soviet Union although divided in several nations now.
Signatory Country... It is the country which has agreed by the meaning and the contents of treaty fundamentally. However, there is no duty in which this treaty is fulfilled.