(a) Except when, and to the extent, that this chapter or any other provision of law now or hereafter made expressly exempts the board, or a particular grant of the rule-making power, from the provisions of this article, every grant of rule-making authority to the board heretofore provided, shall be construed and applied to be effective only:
(1) If heretofore lawfully exercised in accordance with the prior provisions of this chapter and the resulting rule has not been revoked or invalidated by the provisions hereof or by the board; or