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| 涂层长丝 | |||
| 直热式覆氧化物阴极; 敷料灯丝; 氧化物涂敷灯丝 | |||
| coated filament: 4 phrases in 3 subjects |
| Metallurgy | 1 |
| Technology | 2 |
| Textile industry | 1 |
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