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发明名称
摘要
申请公布号
FR2396833(B3)
申请公布日期
1980.07.11
申请号
FR19770021595
申请日期
1977.07.08
申请人
DIETRICH ET CIE SA DE
发明人
分类号
E01B7/12;(IPC1-7):E01B7/12
主分类号
E01B7/12
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