The Commission, or its duly authorized representative, may order testimony to be taken by deposition in any investigation at any stage of such investigation. Such depositions may be taken before any person designated by the Commission having the power to administer oaths. Such testimony shall be reduced to writing by the person taking the deposition or under his or her direction, and shall then be subscribed by the deponent. Any person may be compelled to appear and be deposed and to produce evidence in the same manner as witnesses may be compelled to appear and testify and produce documentary evidence as provided in § 502.131. [Rule 287.]