CFR›Title 19›Chapter I›Part 181›Subpart C ContainsSections 181.21–181.23CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Subpart C—Import Requirements Sections 181.21 § 181.21 Filing of claim for preferential tariff treatment upon importation. 181.22 § 181.22 Maintenance of records and submission of Certificate by importer. 181.23 § 181.23 Effect of noncompliance; failure to provide documentation regarding transshipment. Previous I Subpart I—Advance Ruling Procedures Next D Subpart D—Post-Importation Duty Refund Claims