Industrial Disputes (Central) Rules, 1957
17. Summons
A summons issued by a Board, court, Labor Court, Tribunal or National Tribunal shall be in Form D and may require any person to produce before it any books, papers or other documents and things in the possession of or under the control of such person in any way relating to the matter under investigation or adjudication by the Board, court, Labor Court, Tribunal or National Tribunal which the Board, court, Tribunal or National Tribunal thinks necessary for the purposes of such investigation or adjudication.