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发明名称
摘要
申请公布号
FR2641030(B3)
申请公布日期
1990.11.02
申请号
FR19890017062
申请日期
1989.12.22
申请人
DIEHL GMBH CO
发明人
分类号
E21B23/06;E21B33/128;(IPC1-7):E21F17/00
主分类号
E21B23/06
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代理人
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