Section 10B(6) in Industrial Disputes (Central) Rules, 1957
(6)Evidence shall be recorded either in Court or on affidavit but in the case of affidavit the opposite party shall have the right to cross-examine each of the deponents filing the affidavit. As the oral examination of each witness proceeds, the Labour Court, Tribunal or National Tribunal shall make a memorandum of the substance of what is being deposed. While recording the evidence the Labour Court, Tribunal or National Tribunal shall follow the procedure laid down in rule 5 of Order XVIII of the First Schedule to the Code of Civil Procedure, 1908 (5 of 1908).