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Part 23
FEDERAL · 30 CFR
Part 23 — Telephones and Signaling Devices
14 sections · Title 30: Mineral Resources
§ 23.1
Purpose.
§ 23.2
Definitions.
§ 23.3
Application procedures and requirements.
§ 23.4
§ 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.