Marking of documents requires A, B, and C series labels and possible advance deposit for transmission costs. Rule 75 requires that documents be marked by series: appellant/petitioner materials as the A series, respondent materials as the B series, and Tribunal exhibits as the C series. It also authorises the Appellate Tribunal to require an applicant to deposit, by Demand Draft or Indian Postal Order payable to the Pay and Accounts Officer, Ministry of Corporate Affairs, New Delhi, sums sufficient to cover transmission expenses before a summons is issued.