Then the transform merit of the hold type railroad steel rail borermachine mainly embodiment lowered the Labour intensity of blacksmith, raised a working efficiency.
便携式铁路钢轨钻孔机的加工优点主要体现在降低了铁工的劳动强度，提高了工作效率。
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This rotative speed regulator circuit schematic allows to control the holing speed of your borer or driller machine.