A mechanical pencil to chalk.

• 1. 自动铅笔单元及具备该自动铅笔单元的书写用具 [P] . 中国专利： CN108430793B . 2020.05.19
• 2. 自动铅笔单元及具备该自动铅笔单元的书写用具 [P] . 中国专利： CN108430793A . 2018-08-21
• 3. Automatic pencil to chalk. [P] . BR6400606U . 1985-12-03

  机译： 自动铅笔粉笔。

• 4. MECHANICAL PENCIL AND CASE OF MECHANICAL PENCIL'S LEAD WHICH IS EASY TO PUT LEAD IN A MECHANICAL PENCIL [P] . 韩国专利： KR20110127575A . 2011-11-25

  机译： 机械铅笔和容易在机械铅笔中放置铅的机械铅笔的情况

• 5. MECHANICAL-PENCIL CAP SERVING AS TOUCH-PEN TIP AND PENCIL-LEAD SHARPENER, AND MECHANICAL PENCIL HAVING THE SAME [P] . 美国专利： US2017348998A1 . 2017-12-07

  机译： 机械铅笔帽用作触控笔笔尖和铅笔无铅锉刀，而机械铅笔则具有相同的功能

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