30 CFR Part 23
TELEPHONES AND SIGNALING DEVICES
July 29, 2020
§
23.6
General requirements for approval
§
23.7
Specific requirements for approval
§
23.1
Purpose
§
23.2
Definitions
§
23.3
Application procedures and requirements
§
23.4
[Reserved]
§
23.5
Conditions governing investigations
§
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
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