MSHA - Code of Federal Regulations - 30 CFR 57.4100
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MSHA - Title 30 CFR
30 CFR § 57.4100
Smoking and use of open flames.


No person shall smoke or use an open flame where flammable or combustible liquids, including greases, or flammable gases are--

(a) Used or transported in a manner that could create a fire hazard; or

(b) Stored or handled.