MSHA - Code of Federal Regulations - 30 CFR 7.21
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MSHA - Title 30 CFR
30 CFR § 7.21
Purpose and effective date.

This subpart establishes the specific requirements for approval of brattice cloth and ventilation tubing. It is effective August 22, 1988. Applications for approval or extension of approval submitted after August 22, 1989, shall meet the requirements of this part.