Article 30

(1) Two or more contracting States may at any time notify the Director General that, subject to the conditions indicated in the notification:
1. a common Office shall be substituted for the national Office of each of them;

2. they shall be deemed to be a single State for the purposes of the application of Articles 2 to 17 of this Agreement.

(2) Such notification shall not take effect until six months after the date of dispatch of the communication thereof by the Director General to the other contracting States.