30 C.F.R. PART 23--TELEPHONES AND SIGNALING DEVICES
TITLE 30--Mineral Resources
CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
SUBCHAPTER B--TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS
PART 23--TELEPHONES AND SIGNALING DEVICES
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| Application procedures and requirements.
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| Conditions governing investigations.
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| General requirements for approval.
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| Specific requirements for approval.
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| Special requirements for complete devices.
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| Material required for MSHA records.
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| How approvals are granted.
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| Wording, purpose, and use of approval plate.
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| Instructions for handling future changes in design.
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