Title 30
Mineral Resources
5,954 sections · 206 parts · 6 chapterseCFR snapshot through 2026-08-19
Part 23
TELEPHONES AND SIGNALING DEVICES
1–14 of 14 sections
- § 23.1Purpose.
- § 23.2Definitions.
- § 23.3Application procedures and requirements.
- § 23.4[Reserved]
- § 23.5Conditions governing investigations.
- § 23.6General requirements for approval.
- § 23.7Specific requirements for approval.
- § 23.8Inspection and tests.
- § 23.9Special requirements for complete devices.
- § 23.10Material required for MSHA records.
- § 23.11How approvals are granted.
- § 23.12Wording, purpose, and use of approval plate.
- § 23.13Withdrawal of approval.
- § 23.14Instructions for handling future changes in design.