Zobrazeno 1 - 1
of 1
pro vyhledávání: '"É. G. Mikeladze"'
Publikováno v:
Hydrotechnical Construction. 2:755-758
1. In the excavation of tunnels having large cross sections, the utilization of drill carriages equipped with BU-1 drifters is a progressive measure, which brings about increased rates of driving, and improvement of all the economic indexes. The dril