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quick core drill bit (mine drill bit)
为了克服现有取芯钻头钻出岩芯后，岩芯易紧卡在钻头中不宜取出的不足，本实用新型专利技术提供一种取芯的新型钻头，该钻头不仅能快速取出...
2021-10-18 22:41:02
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