Provision may be made by rules—
(a)as to the giving of evidence in proceedings before the registrar under this Act by affidavit or statutory declaration;
(b)conferring on the registrar the powers of an official referee of the Supreme Court as regards the examination of witnesses on oath and the discovery and production of documents; and
(c)applying in relation to the attendance of witnesses in proceedings before the registrar the rules applicable to the attendance of witnesses before such a referee.