Code of Federal Regulations · Part

Part 23 — Telephones And Signaling Devices

30 C.F.R. pt. 23

• § 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