CFR›Title 43›Subtitle B›Chapter II›Part 1810›Subpart 1810 ContainsSections 1810.1–1810.4CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Subpart 1810—General Rules Sections 1810.1 § 1810.1 Rules of construction; words and phrases. 1810.2 § 1810.2 Communications by mail; when mailing requirements are met. 1810.3 § 1810.3 Effect of laches; authority to bind government. 1810.4 § 1810.4 Information required by forms. Source35 FR 9513, June 13, 1970, unless otherwise noted. Next 1812 Subpart 1812—Qualifications of Practitioners