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发明名称
摘要
申请公布号
FR1578993(A)
申请公布日期
1969.08.22
申请号
FRD1578993
申请日期
1968.05.22
申请人
发明人
分类号
B25H1/00;E21B15/04
主分类号
B25H1/00
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