U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

All TitlesTitle 33Chapter IPart 174-STATESubpart B - Subpart B-Numbering System Requirements
View all text of Subpart B [§ 174.11 - § 174.31]
§ 174.27 - Duration of certificate of number.

A certificate of number must not be valid for more than 3 years.

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