geocentric world model for the teaching in astronomy and spherical trigonometry

• 1. 一种海底世界教学模型 [P] . 中国专利： CN203013043U . 2013.06.19
• 2. 世界立体地图模型的教学装置 [P] . 中国专利： CN201489727U . 2010.05.26
• 3. geozentrisches world model for the teaching of astronomy and sphaerischen trigonometry [P] . 德国专利： DE000001014766A . 1957-08-29

  机译： geozentrisches天文和sphaerischen三角学教学的世界模型

• 4. Teaching aid for teaching in the spherical trigonometry [P] . 德国专利： DE450878C . 1927-10-15

  机译： 球面三角学教学辅助工具

• 5. graphometer for the conversion of the triangles spherical used especially to the development and to the direct measurement of the triangle main nautico - astronomy, to the teaching and the determination of the location and the time [P] . 法国专利： FR429074A . 1911-09-14

  机译： 形变仪，用于将三角形球形转换成三角形，主要用于发展和直接测量三角形主要天文学-天文学，用于教学以及确定位置和时间

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