Writing tip with a completely retractable

• 1. 一种铅芯笔尖完全隐藏且铅芯可在书写时自动推进的铅笔 [P] . 中国专利： CN1775551A . 2006-05-24
• 2. 一种可伸缩笔尖的纤维笔 [P] . 中国专利： CN213593974U . 2021-07-02
• 3. Core-type writing implement with a completely retractable point [P] . AU3340795A . 1996-03-27

  机译： 具有完全可伸缩点的芯型书写工具

• 4. CORE-TYPE WRITING IMPLEMENT WITH A COMPLETELY RETRACTABLE POINT [P] . 世界知识产权组织专利： WO9607550A1 . 1996-03-14

  机译： 具有完全可伸缩点的核心类型写入实现

• 5. Writing tip with a completely retractable [P] . 德国专利： DE4431741C1 . 1996-02-01

  机译： 笔尖完全可伸缩

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• 6. EXPERIMENTAL DESIGN TO ANALYZE THE EFFECT OF WRITING FORMAT ON STUDENT READING COMPREHENSION ON PAPER MEDIA USING COMPLETELY RANDOMIZED FACTORIAL DESIGN [O] . Rexy Satrya Yuwana Adam, Yuswono Hadi 2018

• 1. SOME REMARKS ON COMPLETELY POSITIVE MATRICES AND COMPLETELY POSITIVE GRAPHS [J] . Xiang Shuhuang (Dept.of Appl.Math.Central South UNiversityChangsha 410083PRC) . 高等学校计算数学学报：英文版 . 2000,第S1期
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