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发明名称
DRILL MEMBER
摘要
申请公布号
GB8700109(D0)
申请公布日期
1987.02.11
申请号
GB19870000109
申请日期
1987.01.06
申请人
DARRON TOOL & ENG (SHEFFIELD) LTD
发明人
分类号
E21B10/24;E21B10/30
主分类号
E21B10/24
代理机构
代理人
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地址
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