Fixed frequency unfreezing tool for electric submersible pump von FU JIANFENG, LI TIANSHENG, ZHANG DEZHENG, QIN HAO, LI RUI, ZHU JIKONG, ZHANG XIANG, CHEN YAWEI, HU XUYAN, LI WEITUAN, LI HAN

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Flange opening device von WENG SHUANGHONG, FENG ZHUZHENG, ZHANG HAO, ZHANG YONG, ZHU JIKONG, CHEN CHANG, MU PENGZHANG, CHEN KEYING, PAN YONG, WANG GUANGCAN, RAO YUHONG, LI CHAO, HE DA, WEI YANG, LI HANG, YANG JIN, CEN YONGZHAN, YANG KAIJIAN, WANG YAN

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Door closer with self-limiting and self-unlocking functions von HU GUIBIN, WU HAIQIANG, LIU ZHIFEN, ZHU JIKONG, LIU DONGQI, LI HAN

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