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| tige d'ancrage; boulon d'ancrage; boulon de fondation | |||
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| boulonnage du toit | |||
| boulonnage au toit | |||
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roof bolt : 15 phrases in 4 subjects |
| Coal | 5 |
| General | 7 |
| Mechanic engineering | 2 |
| Technology | 1 |
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