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发明名称
Vorrichtung zum Entnehmen von Proben aus der Seitenwandung eines Bohrloches
摘要
申请公布号
DE678677(C)
申请公布日期
1939.07.19
申请号
DE1935B170921D
申请日期
1935.09.03
申请人
CLARENCE E. BURT
发明人
分类号
E21B49/06
主分类号
E21B49/06
代理机构
代理人
主权项
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