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英国Hall & Watts公司研制成功炮兵用GT-150型陀螺经纬仪。GT-150以L1A2型炮兵方向盘作为基础,在该方向盘上安装该经纬
British Hall & Watts company successfully developed artillery GT-150 type gyro theodolite. The GT-150 is based on the L1A2 artillery steering wheel, which is mounted on the steering wheel