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发明名称
Perfectionnements apportés aux tarières pour creuser le sol
摘要
申请公布号
FR1082707(A)
申请公布日期
1954.12.31
申请号
FRD1082707
申请日期
1953.05.05
申请人
发明人
PETERSEN GERALD A.
分类号
E21B10/44
主分类号
E21B10/44
代理机构
代理人
主权项
地址
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