
DISCUSSION ON APPLICATION OF DRILLING TECHNOLOGY W ITH HOLEWALL PROTECTED BYMUD IN RAILWAY ENGINEERING GEOLOGICAL DRILLING
L iY ouqing
Journal of Railway Engineering Society ›› 1996, Vol. 13 ›› Issue (4) : 85-88.
DISCUSSION ON APPLICATION OF DRILLING TECHNOLOGY W ITH HOLEWALL PROTECTED BYMUD IN RAILWAY ENGINEERING GEOLOGICAL DRILLING
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