MSHA - Code of Federal Regulations - 30 CFR 7.31
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MSHA - Title 30 CFR
30 CFR § 7.31
New technology.

MSHA may approve brattice cloth and ventilation tubing that incorporates technology for which the requirements of this subpart are not applicable, if the Agency determines that the product is as safe as those which meet the requirements of this subpart.

Subpart C--Battery Assemblies