9.2. A stationary engineman whose certificate has been suspended or cancelled may ask the board of examiners to reconsider a decision it has rendered under section 9.1 which has not been appealed from to the court contemplated in section 9.3,
(a) to bring forward new facts which, had they been known in due time, could have been grounds for a different decision;
(b) where, for reasons deemed adequate, he had been unable to have a hearing;
(c) to have any clerical error corrected.
An application to that effect must be sent to the board of examiners, by registered mail, within thirty days after receipt of a copy of the decision by registered mail.