At least 30 days before the adoption of any such ordinance or any amendment or supplement thereto, at least three copies of the code or regulation referred to in section 3101 of this title shall be filed in the office of the building inspector and three copies in the office of the municipal clerk for use by the public. (Added 1967, No. 295 (Adj. Sess.), § 4, eff. March 20, 1968.)