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发明名称
摘要
申请公布号
FR2203912(B1)
申请公布日期
1977.08.05
申请号
FR19720037797
申请日期
1972.10.25
申请人
CIPEC
发明人
分类号
E01D19/06;(IPC1-7):E01C11/00;E01D19/00
主分类号
E01D19/06
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