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经营范围
发明名称
Outil de forage
摘要
申请公布号
FR62749(E)
申请公布日期
1955.06.20
申请号
FRD62749
申请日期
1952.04.18
申请人
发明人
GRUERE CHARLES
分类号
E21B7/02;E21B10/44
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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