► In underground work, these single telescopic airlegs allow the drilling in small section or large section on a platform, in all directions. These stopers and semi-stopers allow uphole drillings (roof bolting, ventilation shafts, chimney,etc…).
A stoper is a unit made up of a telescopic jack leg and a drifter mounted on the same axis as the jack leg.
A semi-stoper is a variation of stoper on which the drifter is mounted parallel to the jackleg.
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