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| 大地测量用太阳镜; 太阳目视观测镜 | |||
| 观日望远镜; 量日镜; 回照器; 太阳望远镜; 太阳目视观测镜; 太阳观察镜 | |||
| helioscope: 1 phrase in 1 subject |
| Technology | 1 |
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