Gyroscopic device comprising a door - gyroscope tending to maintain its direction with respect to the meridian

• 1. 一种手机陀螺仪及包括该手机陀螺仪的系统 [P] . 中国专利： CN206212076U . 2017.05.31
• 2. 一种相机陀螺仪及包括该相机陀螺仪的系统 [P] . 中国专利： CN205910597U . 2017-01-25
• 3. Gyroscopic installation intended to maintain a fixed direction with respect to the surface of the earth [P] . 法国专利： FR548265A . 1923-01-11

  机译： 陀螺仪安装，旨在相对于地球表面保持固定方向

• 4. Gyroscopic device for determining the direction of north and to maintain a heading [P] . 法国专利： FR2495311B1 . 1985-07-19

  机译： 用于确定北方方向并保持航向的陀螺仪设备

• 5. GYROSCOPIC DEVICE FOR DETERMINING THE NORTHERN DIRECTION AND MAINTAINING CAP [P] . 法国专利： FR2495311A1 . 1982-06-04

  机译： 确定北向和保持高度的陀螺仪

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