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drilling and blasting technique (1) |
sectional blasting (1) |
tunneling complexes (1) |
tunneling machines (1) |
vertical workings (1) |
work safety (1) |
drilling and blasting technique (1) |
sectional blasting (1) |
tunneling complexes (1) |
tunneling machines (1) |
vertical workings (1) |
work safety (1) |