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发明名称
摘要
申请公布号
FR2394844(B1)
申请公布日期
1981.05.08
申请号
FR19770018192
申请日期
1977.06.14
申请人
BOYER JEAN JACQUES
发明人
分类号
E01B27/02;E01B27/10;E01B35/00;(IPC1-7):G05D1/08;E01B27/00
主分类号
E01B27/02
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