Typewriter keyboard, which the learning of the writing is facilitated and the preconditions for the formation of purchase of improved

• 1. 供打字机、计算机以及类似设备使用的改进的键盘 [P] . 中国专利： CN1035899A . 1989-09-27
• 2. 有助于网上购买衣服的系统和方法 [P] . 中国专利： CN102365043B . 2015.10.07
• 3. typewriter keyboard, the learning of writing easier and the conditions for improving the education [P] . 德国专利： DE000002322264A . 1974-11-14

  机译： 打字机键盘，更轻松地学习写作以及改善教育条件

• 4. Screening device for covering the keyboard of typewriters for the learning of the blind, writing,. [P] . 德国专利： DE1746056U . 1957-06-06

  机译： 遮盖打字机键盘的遮蔽装置，用于盲人的学习，写作。

• 5. An improved means and apparatus to facilitate the learning and teaching of shorthand, languages, writing and the like [P] . 英国专利： GB355354A . 1931-08-24

  机译： 一种改进的手段和装置，以促进速记，语言，写作等的学习和教学

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