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вынос контура тоннеля
stresses
mining.
marking tunnel contour
(
MichaelBurov
)
;
marking of the contour holes
(
MichaelBurov
)
;
marking of the tunnel cross-section
(
MichaelBurov
)
;
marking of the tunnel cross-section on the face
(
MichaelBurov
)
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