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California Code of Regulations
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Chapter 4. Division of Industrial Safety
Subchapter 17. Mine Safety Orders
Article 21. Mine Ladders and Travelways
Underground
Underground
State of California
7050
(9-107). Stopes.
7051
(11-12). Winzes, Raises, and Openings.
7052
(9-103). Chutes and Ore Passes.