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California Code of Regulations
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Chapter 4. Division of Industrial Safety
Subchapter 17. Mine Safety Orders
Article 25. Engines-Internal Combustion
Underground
Underground
State of California
7068
Internal-Combustion Engines Near Mine Openings.
7069
Engines Prohibited Underground.
7070
Permit to Use Diesel Engines Underground.
7071
Fueling Diesel Engines Underground.