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February 1 - Remaining few precast ring segments on the shaft surface prior to the breakthrough 10 days later |
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TBM Tunnel Chart for DTL3, February 2015 |
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February 1 - Remaining few precast ring segments on the shaft surface prior to the breakthrough 10 days later |
![]() |
TBM Tunnel Chart for DTL3, February 2015 |
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