JUS B M2 149-1981 Support of mine opening Cone-clamp shell bolt Shape and dimensions《矿井巷道支护 圆锥形涨壳式顶板锚杆 形状和尺寸》.pdf

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JUS B M2 149-1981 Support of mine opening Cone-clamp shell bolt Shape and dimensions《矿井巷道支护 圆锥形涨壳式顶板锚杆 形状和尺寸》.pdf_第1页
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JUS B M2 149-1981 Support of mine opening Cone-clamp shell bolt Shape and dimensions《矿井巷道支护 圆锥形涨壳式顶板锚杆 形状和尺寸》.pdf_第2页
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JUS B M2 149-1981 Support of mine opening Cone-clamp shell bolt Shape and dimensions《矿井巷道支护 圆锥形涨壳式顶板锚杆 形状和尺寸》.pdf_第3页
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