an area in front of a coalface where no props are placed, so as to leave access for a mechanical conveyor, the roof being supported by cantilever…
| 单词 | θ213317 |
| 释义 | society > occupation and work > equipment > mining equipment > [noun] > pit supports > system of (1) prop-free front1956 an area in front of a coalface where no props are placed, so as to leave access for a mechanical conveyor, the roof being supported by cantilever… |
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