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Underground work other than tunnels, shafts and subways |
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Construction work for engineering works except bridges, tunnels, shafts and subways |
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Waste-treatment plant construction work |
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Waste disposal site construction work |
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Engineering work for military installations |
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Engineering work for security installations |
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Structures construction work |
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Assembly of metal structures |
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Installation of metal structures |
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Structural works |
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