Hardypick drifting machine
哈迪皮克型平巷电钻机组
Hardypick drifting machine diesel electric driving rig.
哈迪皮克型平巷电钻机组柴油机发电驱动钻机
On Increasing Average Drifting Footage for Domestic Tunnel Boring Machine
提高国产掘进机月平均进尺的探讨
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