PDF(446 KB)
Improvement of ZC7-20 swamp drilling rig
Dang Weizhong, Yang Fengshen, Zhai Naxin, Xia Pengling,Fu Delian
Equipment for Geophysical Prospecting ›› 2010, Vol. 20 ›› Issue (3) : 145-147.
PDF(446 KB)
PDF(446 KB)
Improvement of ZC7-20 swamp drilling rig
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