MSHA - Code of Federal Regulations - 30 CFR 75.152
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MSHA - Title 30 CFR
30 CFR § 75.152
Tests of air flow; qualified person.

A person is a qualified person within the meaning of the provisions of Subpart D--Ventilation of this part requiring that tests of air flow be made by a qualified person only if he is a certified person under §75.100 or a person trained and designated by a certified person to perform such tests.