Disclosure of documents
21. Any party to any proceedings shall furnish to the registrar on his request any document or other information which the Tribunal may require and which it is in his power to furnish and shall afford to all other parties to the proceedings an opportunity to inspect such documents (or copies of such documents) and to take copies thereof: Provided that nothing in this Rule shall be deemed to require the furnishing of any information which it would be contrary to the public interest to disclose.