Section 29. Seal of professional mechanical engineer. —

Each registrant for the grade of professional mechanical engineer shall, upon registration, obtain a seal of a design prescribed by the Board, bearing the registrant's name, the certificate number, and the legend "Registered Professional Mechanical Engineer." Plans, specifications, reports and other professional documents prepared by or executed under the immediate supervision of, and issued by a registrant, shall be stamped on every sheet with said seal when filed with government authorities or when submitted or used professionally: Provided, That it shall be unlawful for any one to stamp or seal any document with said seal after the certificate of the registrant named therein has been revoked or suspended, unless said certificate shall have been reinstated or reissued.