CFR›Title 19›Chapter I›Part 172›Subpart C ContainsSections 172.21–172.22CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Subpart C—Disposition of Petitions Sections 172.21 § 172.21 Decisions effective for limited time. 172.22 § 172.22 Decisions not protestable. Previous B Subpart B—Action on Petitions Next D Subpart D—Offers in Compromise