Part 23—Telephones and Signaling Devices

1. CFR
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3. Title 30
4. ›
5. Chapter I
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7. Part 23

Sections

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