MSHA - Code of Federal Regulations - 30 CFR 75.400-1
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MSHA - Title 30 CFR
30 CFR § 75.400-1

Definitions.

(a) The term coal dust means particles of coal that can pass a No. 20 sieve.

(b) The term float coal dust means the coal dust consisting of particles of coal that can pass a No. 200 sieve.

(c) The term loose coal means coal fragments larger in size than coal dust.




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