Title 30

PART 23

Part 23 - Telephones And Signaling Devices

PART 23 - TELEPHONES AND SIGNALING DEVICES Authority:30 U.S.C. 957, 961.

Sec. 23.2(f) also issued under 30 U.S.C. 811.

Source:Schedule 9B, 4 FR 1555, Apr. 11, 1939, unless otherwise noted.

• Authority: 30 U.S.C. 957, 961.
• Source: Schedule 9B, 4 FR 1555, Apr. 11, 1939, unless otherwise noted.

30:1.0.1.2.12.0.1.1	SECTION 23.1	23.1 Purpose.
30:1.0.1.2.12.0.1.2	SECTION 23.2	23.2 Definitions.
30:1.0.1.2.12.0.1.3	SECTION 23.3	23.3 Application procedures and requirements.
30:1.0.1.2.12.0.1.4	SECTION 23.4	23.4 [Reserved]
30:1.0.1.2.12.0.1.5	SECTION 23.5	23.5 Conditions governing investigations.
30:1.0.1.2.12.0.1.6	SECTION 23.6	23.6 General requirements for approval.
30:1.0.1.2.12.0.1.7	SECTION 23.7	23.7 Specific requirements for approval.
30:1.0.1.2.12.0.1.8	SECTION 23.8	23.8 Inspection and tests.
30:1.0.1.2.12.0.1.9	SECTION 23.9	23.9 Special requirements for complete devices.
30:1.0.1.2.12.0.1.10	SECTION 23.10	23.10 Material required for MSHA records.
30:1.0.1.2.12.0.1.11	SECTION 23.11	23.11 How approvals are granted.
30:1.0.1.2.12.0.1.12	SECTION 23.12	23.12 Wording, purpose, and use of approval plate.
30:1.0.1.2.12.0.1.13	SECTION 23.13	23.13 Withdrawal of approval.
30:1.0.1.2.12.0.1.14	SECTION 23.14	23.14 Instructions for handling future changes in design.

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