15. For the purposes of this Part of this Act, unless the contrary is shown—
(a)any order made by a court in a specified State purporting to bear the seal of that court or to be signed by any person in his capacity as a judge, magistrate or officer of the court, shall be deemed without further proof to have been duly sealed or, as the case may be, to have been signed by that person;
(b)the person by whom the order was signed shall be deemed without further proof to have been a judge, magistrate or officer, as the case may be, of that court when he signed it and, in the case of an officer, to have been authorised to sign it; and
(c)a document purporting to be a certified copy of an order made by a court in a specified State shall be deemed without further proof to be such a copy.