Mine Safety and Health Administration (MSHA) - Code of Federal Regulations - 30 CFR 23.6
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MSHA - Title 30 CFR
30 CFR § 23.6

General requirements for approval.

Telephones and signaling devices shall be durable in construction, practical in operation, and suitable for conditions of underground service. They shall offer no probable explosion hazard under normal operation if use in gassy or dusty mine atmospheres.




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