蒙西小三角地区
Western small triangle areas in Inner Mongolia
国家测绘局第三地形测量队
The Third Topographic Surveying Team of State Bureau of Surveying and Mapping
No.3 Topographic Survey Team of SBSM
The Third Heilongjiang Surveying and Mapping Engineering Institute
Hrbin 150081
三角形测高器
Trigonometrical hypsometer