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30 C.F.R. Part 23 – Telephones and Signaling Devices | Midpage
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Code of Federal Regulations
Title 30
Chapter I
Subchapter B
Part 23
30 C.F.R. 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.