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21The application of the seal of the Authority shall be authenticated by the signature—
(a)of the chairman or some other person authorised either generally or specially by the Authority to act for that purpose, and
(b)of one other member.
22Any document purporting to be an instrument made or issued by or on behalf of the Authority and to be duly executed by a person authorised by the Authority in that behalf, shall be received in evidence and be treated, without further proof, as being so made or issued unless the contrary is shown.