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  1. 1
    Arch-shaped cutter for diffuse adenomyosis uterus protection U surgery

    Arch-shaped cutter for diffuse adenomyosis uterus protection U surgery von YAN DANLING, LENG RENCHUN

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  2. 2
    Long-acting degassing sand-prevention device suitable for 7-inch casing pipe production well

    Long-acting degassing sand-prevention device suitable for 7-inch casing pipe production well von YANG XILIANG, LENG RENCHUN, HE DONG, HOU LIJIA, YANG WENXIU, TANG YONG, JIANG MINGBO, ZHANG XUEPENG, WANG YUYING

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