Material supporting frame for thick steel plate cutting sawing machine von SHI JIANJUN, GAO LEI, ZHAO JUNHUA, ZHANG WENLI, WANG JINGZE, LI HAO, JI FULIANG, ZHANG HENG, TIE DIANQING

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Improved fully-soluble bridge plug von ZHANG ZHENGYU, LIU XINGCHUN, WEI PENG, ZHANG SHUAI, LI YANGBING, ZHANG XINHUA, TIAN TAIHUA, WANG CHANG, LIU DIANQING, TIE ZHONGYIN, ZHENG WEILIN, SUN YUGANG, CHEN ZENGBAO, LIU HU, LI MENGLAI, CHEN HONGHUI

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Bridge plug with rubber cylinder assembly von ZHANG ZHENGYU, LIU DIANQING, LIU XINGCHUN, WANG RONGQIANG, TIE ZHONGYIN, SUN YUGANG, LIU JUN, LI KUN, YAN LEI, LIU HU, LI MENGLAI

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Slip assembly and bridge plug von ZHANG ZHENGYU, LIU DIANQING, LIU XINGCHUN, ZHOU CHUNSHENG, TIE ZHONGYIN, SUN YUGANG, ZHENG WEILIN, LI GUOLIANG, YAN LEI, LI YANGBING, LI MENGLAI

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