Code of Federal Regulations
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30 CFR Mineral Resources
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I Mine Safety and Health ...
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B Testing, Evaluation, an...
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33 Dust Collectors For Us...
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Subpart B —
Dust-Collector Requirements
§33.20 —
Design and construction
§33.21 —
Modification of test equipment
§33.22 —
Mode of use
§33.23 —
Mechanical positioning of parts