19 CFR 177.8 : Customs Duties (§ 0.1 To Parts 400-599) — (§ 141.0 To Parts 193-199) — U.S. Customs And Border Protection, Department Of Homeland Security; Department Of The Treasury (Continued) (§ 141.0 To Parts 193-199) — Administrative Rulings (§ 177.0 To § 177.31) — General Ruling Procedure (§ 177.1 To § 177.13) — Issuance of rulings.