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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. 文章介紹了一種新型小尺寸鑽頭，它主要由一個偏置的多錐形牙輪和一個圓柱形滾輪及兩個牙掌組成。