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φ75金刚石三翼内凹复合片pdc不取芯钻头地质探水钻头厂家直供
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厂家直销矿用pdc金刚石复合片钻头 中空注浆锚杆钻头65mm现货
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φ75金刚石三翼内凹复合片pdc不取芯钻头地质探水钻头厂家直供
厂家直销矿用pdc金刚石复合片钻头 中空注浆锚杆钻头65mm现货
厂家自营黑煤牌108三翼内凹复合片钻头 108无芯金刚石钻头
金刚石复合片烧结体钻头
金隆达 pdc取芯钻头 金刚石复合片取芯钻头