Section 9
SEC. 9. The Insular Collector of Customs is hereby authorized to prescribe suitable and necessary regulations for carrying out the purposes of this Act. not inconsistent with the terms hereof, and collectors of customs at sub-ports of entry in the Philippine Islands are hereby authorized to grant free entry of railroad materials and supplies, the exemption of which from duty under this Act may be questioned by them, under the general direction and supervision of the Insular Collector of Customs.