DASHED LINE DRAWING AID AND METHOD OF DRAWING DASHED LINES.

• 1. 一种虚线实线双用圆规以及绘制虚线圆的方法 [P] . 中国专利： CN106864116B . 2017.10.31
• 2. 一种虚线实线双用圆规以及绘制虚线圆的方法 [P] . 中国专利： CN106864116A . 2017-06-20
• 3. instrument for drawing of dashed lines. [P] . DK85341C . 1958-04-08

  机译： 用于绘制虚线的仪器。

• 4. System and method for drawing a dashed path [P] . 美国专利： US7589730B1 . 2009-09-15

  机译： 绘制虚线路径的系统和方法

• 5. Instrument for drawing dashed lines or the like [P] . 美国专利： US5224269A . 1993-07-06

  机译： 用于绘制虚线等的仪器

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