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发明名称
COMPLEX HAMMER AIR DISPLACEMENT VOLUME CONTROLLED
摘要
申请公布号
KR20130087854(A)
申请公布日期
2013.08.07
申请号
KR20120009072
申请日期
2012.01.30
申请人
CHANG SIN INTERNATIONAL CO., LTD.
发明人
LEE, CHAE GOO;KIM, CHANG ROK
分类号
E21B1/38;E21B1/36;E21B10/36;E21B10/38
主分类号
E21B1/38
代理机构
代理人
主权项
地址
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