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发明名称
摘要
申请公布号
FR2048160(A5)
申请公布日期
1971.03.19
申请号
FR19690018148
申请日期
1969.06.03
申请人
DEMOSS ALAN;LEAVITT FRANK
发明人
分类号
E01B11/18;E01B29/46;(IPC1-7):E01B9/00
主分类号
E01B11/18
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