30 CFR Part 23 - TELEPHONES AND SIGNALING DEVICES
- § 23.1 Purpose.
- § 23.2 Definitions.
- § 23.3 Application procedures and requirements.
- § 23.4 [Reserved]
- § 23.5 Conditions governing investigations.
- § 23.6 General requirements for approval.
- § 23.7 Specific requirements for approval.
- § 23.8 Inspection and tests.
- § 23.9 Special requirements for complete devices.
- § 23.10 Material required for MSHA records.
- § 23.11 How approvals are granted.
- § 23.12 Wording, purpose, and use of approval plate.
- § 23.13 Withdrawal of approval.
- § 23.14 Instructions for handling future changes in design.
Source:
Schedule 9B, 4 FR 1555, Apr. 11, 1939, unless otherwise noted.