MSHA - Code of Federal Regulations - 30 CFR 74.16
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MSHA - Title 30 CFR
30 CFR § 74.16
required for record.

    (a) As part of the permanent record of the approval application process, NIOSH will retain a complete CMDPSU or CPDM, as appropriate, and MSHA will retain a CMDPSU or CPDM, as appropriate, that has been tested and certified. Material not required for record purposes will be returned to the applicant at the applicant’s request and expense upon receipt of written shipping instructions by MSHA or NIOSH.
    (b) As soon as a CMDPSU or CPDM, as appropriate, is commercially available, the applicant shall deliver a complete sampling device free of charge to NIOSH at the address specified on the NIOSH Web page: http://www.cdc.gov/ niosh/mining.