PDF(312 KB)
Introduction of the control principle and major part of mechanical fisher valve
Shi Yin,Gao Bin,Li Haijun , Zeng Xi
Equipment for Geophysical Prospecting ›› 2014, Vol. 24 ›› Issue (6) : 407-410.
PDF(312 KB)
PDF(312 KB)
Introduction of the control principle and major part of mechanical fisher valve
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