... 振动钻钻头 vibrating bit 重钻钻头 re-drill bit 霰弹钻钻头 pellet impact bit ...
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The reaming drill bit in slim hole is a key tools of re-drilling in existing well.
小井眼扩孔钻头是老井重钻的关键设备。
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Every employee is trained to do every job, and they're free to fix their own problems--without waiting hours for a specialist to replace a drill bit, for instance.
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