The Commission, or its designated representative may issue orders or subpoenas directing the person named therein to appear before a designated representative at a designated time and place to testify or to produce documentary evidence relating to any matter under investigation, or both. Such orders and subpoenas shall be served in the manner provided in Sec. 502.134. [Rule 286.] [49 FR 44369, Nov. 6, 1984, as amended at 76 FR 10262, Feb. 24, 2011]