Appellate Tribunal appeals: three-month filing; tribunal may confirm, modify, annul or remit orders and must notify parties. Any person aggrieved by an order of an appellate or revisional authority may appeal to the Appellate Tribunal within three months; the Tribunal may, after hearing the parties, confirm, modify, annul, or remit the order and may take additional evidence, must send copies of its orders to the proper officer and other party, and shall, where possible, decide appeals within three years.