MSHA - Code of Federal Regulations - 30 CFR 7.72
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MSHA - Title 30 CFR
30 CFR § 7.72
New technology.

MSHA may approve a blasting unit that incorporates technology for which the requirements of this subpart are not applicable if the Agency determines that the blasting unit is as safe as those which meet the requirements of this subpart.

Subpart J--Electric Motor Assemblies