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| tunnel-furnace; tunnel-kiln | |||
| tunnel furnace; tunnel type furnace | |||
| tunnel kiln | |||
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| tunnel furnace | |||
| four tunnel: 13 phrases in 5 subjects |
| Construction | 1 |
| Glass production | 1 |
| Industry | 1 |
| Metallurgy | 8 |
| Technology | 2 |
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