§ 18.22. Boring-type machines equipped for auxiliary face ventilation.
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/us/cfr/t30/s§ 18.22·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
Each boring-type continuous-mining machine that is submitted for approval shall be constructed with an unobstructed continuous space(s) of not less than 200 square inches total cross-sectional area on or within the machine to which flexible tubing may be attached to facilitate auxiliary face ventilation.