| 摘要 |
An overcast serving utility in the ventilation of tunnelways in an underground mine defined by an erected frame, typically made from steel, and including pivoting clips and splice strips for ready assembly and, as well, the absence of comingling of uncontaminated and contaminated air. The invention simplifies the approach for passing new air into the mining area and permitting contaminated air flowing through lateral tunnelways to pass over the overpass.
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