MSHA - Code of Federal Regulations - 30 CFR 33.22
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MSHA - Title 30 CFR
30 CFR § 33.22
Mode of use.

(a) A unit or system may be designed for use in connection with percussion and/or rotary drilling in any combination of the following drilling positions: (1) Vertically upward, (2) upward at angles to the vertical, (3) horizontally, and (4) downward.

(b) Dust-collector units may be designed for use with specific drilling equipment or at specific drilling speeds.