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发明名称
LOCKING APPARATUS OF DRILLING M/C
摘要
申请公布号
KR910004116(Y1)
申请公布日期
1991.06.15
申请号
KR19880019865U
申请日期
1988.11.30
申请人
SAM SUNG HEAVY IND.CO.,LTD.
发明人
KIM SEUNG-KYONG
分类号
E21B7/00;(IPC1-7):E21B7/00
主分类号
E21B7/00
代理机构
代理人
主权项
地址
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