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| 横杆 〔塔上,杆上〕信号 | |||
| 旗语信号 | |||
| 杆上信号; 塔上信号; 手旗信号; 手旗通信; 臂板信号机 | |||
| semaphore signal: 13 phrases in 3 subjects |
| Communications | 5 |
| Rail transport | 5 |
| Technology | 3 |
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