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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 28, 2025
All Titles
Title 21
Chapter I
Part 121
Subpart A - Subpart A—General Provisions
§ 121.1 - Applicability.
§ 121.3 - Definitions.
§ 121.4 - Qualifications of individuals who perform activities under subpart C of this part.
§ 121.5 - Exemptions.
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