... top hold-down 上部压板 top hole drilling 上部井段钻进 top hole pressure 出口压力 ...
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Designed with a form as from top to bottom and group drilling set, a new type of drilling machine for air hole for automatic molding line has been awarded a national patent.
新型钻气孔机用于全自动造型线，设计采用自上而下、群钻气孔方式。该设计已获得国家专利。
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