Before the license of any licensee, or any registration, or any certification is suspended or revoked by the board, a written copy of the complaint made shall be furnished to the licensee, registrant, or person against whom the same is directed, and an opportunity be afforded him to be heard before the board personally and by counsel. At least ten days' written notice of the time and place of such hearing shall be given the licensee, registrant or person by registered mail addressed to the post office address as shown on the biennial registration, or other record, or information in possession of the board.
63 P.S. § 155