Title 30, Part 23 — Telephones and Signaling Devices
14 sections
Section 23.1
Purpose.
Section 23.2
Definitions.
Section 23.3
Application procedures and requirements.
Section 23.4
[Reserved]
Section 23.5
Conditions governing investigations.
Section 23.6
General requirements for approval.
Section 23.7
Specific requirements for approval.
Section 23.8
Inspection and tests.
Section 23.9
Special requirements for complete devices.
Section 23.10
Material required for MSHA records.
Section 23.11
How approvals are granted.
Section 23.12
Wording, purpose, and use of approval plate.
Section 23.13
Withdrawal of approval.
Section 23.14
Instructions for handling future changes in design.