{"data":{"id":"us/19-cfr-10.138","jurisdiction":"us","citation":"19 CFR 10.138","heading":"Proof of use.","body":"Within 3 years from the date of entry or withdrawal from warehouse for consumption, the importer shall submit in duplicate in support of his claim for free entry or for a reduced rate of duty a certificate executed by (1) the superintendent or manager of the manufacturing plant, or (2) the individual end-user or other person having knowledge of the actual use of the imported article. The certificate shall include a description of the processing in sufficient detail to show that the use contemplated by the law has actually taken place. A blanket certificate covering all purchases of a given type of merchandise from a particular importer during a given period, or all such purchases with specified exceptions, may be accepted for this purpose, provided the importer shall furnish a statement showing in detail, in such manner as to be readily identified with each entry, the merchandise which he sold to such manufacturer or end-user during such period.","path":["Title 19—Customs Duties","CHAPTER I—U.S. CUSTOMS AND BORDER PROTECTION, DEPARTMENT OF HOMELAND SECURITY; DEPARTMENT OF THE TREASURY","PART 10—ARTICLES CONDITIONALLY FREE, SUBJECT TO A REDUCED RATE, ETC.","Subpart A—General Provisions"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-19.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:40Z","sha256":"0808d13101925ede58e3c002a11c01ebfde1207aaa1bd68949c88f8c18e950e8","source_id":"us-cfr","stale":true,"prev":"us/19-cfr-10.137","next":"us/19-cfr-10.139"},"notice":"GroundRules: Original legal text. Not legal advice."}