law: 21. Power of officers while holding inquiries, etc. under the Act.-
  Any officer or authority while holding an inquiry or hearing an appeal or exercising powers of revision under this Act shall have the same powers as are vested in a civil court under the Code of Civil Procedure, 1908 (5 of 1908), when trying a suit, in respect of the following matters, namely:-
  (a) enforcing the attendance of any person and examining him on oath;
  (b) requiring the discovery and production of documents and material objects;
  (c) receiving evidence on affidavit; and
  (d) such other matters as may be prescribed.
  1. Subs. by Act 15 of 1976, s. 10, for "to such persons" (w.e.f. 8-12-1975).