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Title 30--Mineral Resources
CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
PART 23--TELEPHONES AND SIGNALING DEVICES
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 | 23.1 | Purpose. |
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| 23.2 | Definitions. |
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| 23.3 | Applications. |
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| 23.5 | Conditions governing investigations. |
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| 23.6 | General requirements for approval. |
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| 23.7 | Specific requirements for approval. |
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| 23.8 | Inspection and tests. |
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| 23.9 | Special requirements for complete devices. |
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| 23.10 | Material required for MSHA records. |
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| 23.11 | How approvals are granted. |
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| 23.12 | Wording, purpose, and use of approval plate. |
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| 23.13 | Withdrawal of approval. |
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| 23.14 | Instructions for handling future changes in design. |
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