The mast assembly supports the rotary drill head and its hoisting mechanism.

支架元件支援转动钻头及其提升机构.

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Spindle feeds and speeds are controlled by selector levers which engage the proper gears drill head.

主轴的进能量和转速是通过选速杆使主轴箱中的适当齿轮相啮合而控制的.

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