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发明名称
Perfectionnements aux trépans
摘要
申请公布号
FR783644(A)
申请公布日期
1935.07.17
申请号
FRD783644
申请日期
1935.01.03
申请人
发明人
ZUBLIN JOHN ADOLPHUS
分类号
E21B10/08;E21B10/18;E21B10/20;E21B10/22
主分类号
E21B10/08
代理机构
代理人
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