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ABSTRACT : In this paper, a new small-sized bit is introduced. The bit is mainly composed of a biassed polyconic cutter, a cylindric roller and two bit legs. 文章介绍了一种新型小尺寸钻头，它主要由一个偏置的多锥形牙轮和一个圆柱形滚轮及两个牙掌组成。