Operator out from under the drill
Remote drilling from a supported area, and the air leg holds the angle on every hole

With conventional drilling the rock drill operator stands directly beneath the drill, exposed to falling rock, and holding the mine standard 70–90° angle by hand is difficult, so face shape and advance rates suffer. A remote-controlled air leg and rock drill remove the operator from beneath the drill, and an independent air leg holds the correct angle, taking human error out of drilling discipline.
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