MSHA - Code of Federal Regulations - 30 CFR 15.3
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MSHA - Title 30 CFR
30 CFR § 15.3
Observers at tests and evaluations.

Only personnel of MSHA, designees of MSHA, representatives of the applicant, and such other persons as agreed upon by MSHA and the applicant shall be present during tests and evaluations conducted under this part.