China Petroleum Machinery 1977 Issue 2 y6- b14-160m ji sl<sub>1</sub>-160 xing shui long tou gai zao xiao jie

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China Petroleum Machinery
1001-4578
1977 Issue 2

y6- b14-160m ji sl₁-160 xing shui long tou gai zao xiao jie

..............page:1-4