30 CFR Part 57Public Domain
§ 57.20032 — Two-way communication equipment for underground operations
Subpart S — Miscellaneous
Telephones or other two-way communication equipment with instructions for their use shall be provided for communication from underground operations to the surface.
Public Domain: 30 CFR Part 57 (MSHA Safety and Health Standards — Underground Metal and Nonmetal Mines) is a U.S. government publication and is not subject to copyright. Text extracted from the official source ↗. Figures are served from the eCFR; if one does not load, use the link in its place.