It can increase the hole inclination Angle range and drill elevation Angle holes, while setting the top drive power head and hole top plate toward the opposite direction.

动力头及孔口板调转方向，可直接钻凿仰孔，大大增加钻孔倾角范围。

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Even so Stevenage knew a second goal was vital to erase any lingering doubts about their elevation to League Two and it finally arrived when Byrom surged forward and unleashed a low drive into the bottom right-hand corner.

BBC: Charlie Griffin