补角;
The arbitrary angle arbitrarily bisector is composed of an involute board ( 3), a T-shaped line ruler ( 2), three equal division angle parts of an evenly divided line plate ( 1), and an auxiliary part.
任意角任意等分仪由渐开线板(3),T形线尺(2)和等分刻度线板(1)三个等分角度的零件及辅助零件组成。
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