CN209040807U - 一种防堵油水井冲砂笔尖 - Google Patents
一种防堵油水井冲砂笔尖 Download PDFInfo
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Inventor after: Li Haoqing Inventor after: Guo Fugui Inventor before: Zhang Xingrui Inventor before: Yin Chengshuai Inventor before: Lv Jianhai Inventor before: Liu Jinshan Inventor before: Zheng Dangming Inventor before: Song Yong Inventor before: Guo Fugui Inventor before: Huang Chengcheng Inventor before: Li Haoqing Inventor before: Chen Long |
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