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| 方位指示管〔器〕 | |||
| 方位角指示管 | |||
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bearing tube : 10 phrases in 6 subjects |
| Electronics | 1 |
| Metallurgy | 2 |
| Nautical | 2 |
| Oil / petroleum | 1 |
| Shipbuilding | 2 |
| Technology | 2 |
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